去除java文件中开头的无效的导包，将方法中传递的匿名对象使用lambda表达式来替换

app/src/main/java/com/example/stlink/LaunchActivity.java

@@ -22,10 +22,6 @@ public class LaunchActivity extends AppCompatActivity {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_launch);
 
-
-//        //去除当前活动标题栏
-//        Objects.requireNonNull(getSupportActionBar()).hide();
-
         mClipLeftLoadingImageView = findViewById(R.id.iv_login_loading);
         mClipLeftLoadingImageView.setImageLevel(0);
 
@@ -37,13 +33,10 @@ public class LaunchActivity extends AppCompatActivity {
 
         //延时加载
         Handler handler = new Handler();
-        handler.postDelayed(new Runnable() {
+        handler.postDelayed(() -> {
-            @Override
-            public void run() {
             Intent intent = new Intent(LaunchActivity.this, IdChooseActivity.class);
             intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK|Intent.FLAG_ACTIVITY_NEW_TASK);
             startActivity(intent);
-            }
         }, 1000);//3秒后执行Runnable中的run方法
 
     }

app/src/main/java/com/example/stlink/activitys/IdChooseActivity.java

@@ -7,7 +7,6 @@ import android.os.Looper;
 import android.os.Message;
 import android.view.Gravity;
 import android.view.KeyEvent;
-import android.view.View;
 import android.widget.Button;
 import android.widget.Toast;
 
@@ -69,25 +68,19 @@ public class IdChooseActivity extends AppCompatActivity {
      */
     public void setOnclickListener(){
         // 选择学生端登录
-        stuLoginCho.setOnClickListener(new View.OnClickListener() {
+        stuLoginCho.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             intentIdCho = new Intent(IdChooseActivity.this, LoginActivity.class);
             bundle.putInt(ModelFieldConstants.ROLE_ID, 0);
             intentIdCho.putExtras(bundle);
             startActivity(intentIdCho);
-            }
         });
 
         // 选择教师端登录
-        teaLoginCho.setOnClickListener(new View.OnClickListener() {
+        teaLoginCho.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             intentIdCho = new Intent(IdChooseActivity.this, LoginActivity.class);
             bundle.putInt(ModelFieldConstants.ROLE_ID, 1);
             intentIdCho.putExtras(bundle);
             startActivity(intentIdCho);
-            }
         });
     }
 
@@ -126,9 +119,6 @@ public class IdChooseActivity extends AppCompatActivity {
             Intent intent = new Intent(Intent.ACTION_MAIN);
             intent.addCategory(Intent.CATEGORY_HOME);
             startActivity(intent);
-            //退出程序代码
-//            finish(); //结束程序
-//            System.exit(0);  //退出程序
         }
     }
 }

app/src/main/java/com/example/stlink/activitys/LoginActivity.java

@@ -80,21 +80,18 @@ public class LoginActivity extends AppCompatActivity {
     /**
      * 添加按钮点击监听事件
      */
+    @SuppressLint("ResourceAsColor")
     private void setOnclickListener(){
 
         LoginUtil.userLogin(LoginActivity.this, btLogin, etAccount, etPwd, cbRememberPwd );
 
         //用户注册
-        lgRegister.setOnClickListener(new View.OnClickListener() {
+        lgRegister.setOnClickListener(v -> {
-            @SuppressLint("ResourceAsColor")
-            @Override
-            public void onClick(View v) {
             lgRegister.setTextColor(R.color.crimson);
             lgRegister.getPaint().setUnderlineText(true);
             Intent intent = new Intent(LoginActivity.this, RegisterActivity.class);
             intent.putExtras(bundle);
             startActivity(intent);
-            }
         });
     }
 
@@ -122,7 +119,7 @@ public class LoginActivity extends AppCompatActivity {
 
         String account = spFile.getString(accountKey, null);
         String password = spFile.getString(passwordKey, null);
-        Boolean rememberPassword = spFile.getBoolean(rememberPasswordKey, false);
+        boolean rememberPassword = spFile.getBoolean(rememberPasswordKey, false);
         if(account != null && !TextUtils.isEmpty(account)){
             etAccount.setText(account);
             etAccount.setSelection(account.length());

app/src/main/java/com/example/stlink/activitys/MapActivity.java

@@ -5,7 +5,6 @@ import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.Handler;
-import android.os.Looper;
 import android.os.Message;
 import android.view.View;
 import android.widget.ImageButton;
@@ -27,7 +26,6 @@ import com.baidu.mapapi.map.BaiduMap;
 import com.baidu.mapapi.map.BitmapDescriptor;
 import com.baidu.mapapi.map.BitmapDescriptorFactory;
 import com.baidu.mapapi.map.MapStatus;
-import com.baidu.mapapi.map.MapStatusUpdate;
 import com.baidu.mapapi.map.MapStatusUpdateFactory;
 import com.baidu.mapapi.map.MapView;
 import com.baidu.mapapi.model.LatLng;
@@ -41,7 +39,6 @@ import com.baidu.mapapi.search.geocode.ReverseGeoCodeResult;
 import com.example.stlink.R;
 import com.example.stlink.configs.adapter.LocationPoiAdapter;
 import com.example.stlink.configs.onRecyclerViewItemClickListener;
-import com.example.stlink.fragments.StuHomeFragment;
 import com.example.stlink.model.constants.ModelFieldConstants;
 import com.example.stlink.utils.MyLocationListener;
 
@@ -106,6 +103,7 @@ public class MapActivity extends AppCompatActivity {
     /**
      * 初始化地图相关
      */
+    @SuppressLint("NotifyDataSetChanged")
     private void initView(){
         //获取布局相关控件
         mMapView = findViewById(R.id.b_map_view);
@@ -116,10 +114,7 @@ public class MapActivity extends AppCompatActivity {
 
         mRecyclerView= findViewById(R.id.rv_msg);
         mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
-        locationPoiHandler = new Handler(new Handler.Callback() {
+        locationPoiHandler = new Handler(msg -> {
-            @SuppressLint("NotifyDataSetChanged")
-            @Override
-            public boolean handleMessage(@NonNull Message msg) {
             if(msg.arg1 == 1){
                 adapter=new LocationPoiAdapter(MapActivity.this,mList);
                 mRecyclerView.setAdapter(adapter);
@@ -127,12 +122,9 @@ public class MapActivity extends AppCompatActivity {
                 adapter.setOnItemClickListener(recyclerViewItemClickListener);
             }
             return false;
-            }
         });
 
-        myLocationListenerHandler = new Handler(new Handler.Callback() {
+        myLocationListenerHandler = new Handler(msg -> {
-            @Override
-            public boolean handleMessage(@NonNull Message msg) {
             nowLocation = myLocationListener.getLocation();
             if(msg.arg1 == 200 && nowLocation != null){
                 LatLng point = new LatLng(nowLocation.getLatitude(), nowLocation.getLongitude());
@@ -149,7 +141,6 @@ public class MapActivity extends AppCompatActivity {
                 System.out.println("nowLocation : " + nowLocation);
             }
             return false;
-            }
         });
 
         // 得到地图
@@ -248,9 +239,7 @@ public class MapActivity extends AppCompatActivity {
      */
     private void setOtherListener(){
         //重定位
-        ivRelocation.setOnClickListener(new View.OnClickListener() {
+        ivRelocation.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             //点击重定位按钮，启动定位
             System.out.println("mBaiduMap:starting................");
             mLocationClient.start();
@@ -260,7 +249,6 @@ public class MapActivity extends AppCompatActivity {
 //                LatLng ll = new LatLng(nowLocation.getLatitude(), nowLocation.getLongitude());
 //                MapStatusUpdate msu = MapStatusUpdateFactory.newLatLng(ll);
 //                mBaiduMap.animateMapStatus(msu);
-            }
         });
         abBtReturn.setOnClickListener(new View.OnClickListener() {
             @Override
@@ -269,9 +257,7 @@ public class MapActivity extends AppCompatActivity {
             }
         });
         //保存
-        abBtSave.setOnClickListener(new View.OnClickListener() {
+        abBtSave.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             nowLocation = myLocationListener.getLocation();
             String  ll = "(" + nowLocation.getLatitude() + "," + nowLocation.getLongitude() + ")";
             Intent intent = new Intent();
@@ -280,29 +266,24 @@ public class MapActivity extends AppCompatActivity {
             intent.putExtras(bundle);
             setResult(100,intent);
             finish();
-            }
         });
         recyclerViewItemClickListener = new onRecyclerViewItemClickListener() {
             @Override
             public void onItemClick(RecyclerView parent, View view, int position) {
                 PoiInfo poiInfo = mList.get(position);
+                //添加"Yes"按钮
+                //添加取消
                 AlertDialog alertDialog2 = new AlertDialog.Builder(MapActivity.this)
                         .setMessage("签到地点【" + poiInfo.name + "】")
-                        .setPositiveButton("确定", new DialogInterface.OnClickListener() {//添加"Yes"按钮
+                        .setPositiveButton("确定", (dialogInterface, i) -> {
-                            @Override
-                            public void onClick(DialogInterface dialogInterface, int i) {
                             Intent intent = new Intent();
                             Bundle bundle = getIntent().getExtras();
                             bundle.putString(ModelFieldConstants.LOCATION, poiInfo.name);
                             intent.putExtras(bundle);
                             setResult(100,intent);
                             finish();
-                            }
                         })
-                        .setNegativeButton("取消", new DialogInterface.OnClickListener() {//添加取消
+                        .setNegativeButton("取消", (dialogInterface, i) -> {
-                            @Override
-                            public void onClick(DialogInterface dialogInterface, int i) {
-                            }
                         })
                         .create();
                 alertDialog2.show();

app/src/main/java/com/example/stlink/activitys/ScanQRCodeActivity.java

@@ -14,9 +14,5 @@ public class ScanQRCodeActivity extends AppCompatActivity {
         setContentView(R.layout.activity_scan_code);
     }
 
-    private void initView(){
-
-    }
-
 }
 

app/src/main/java/com/example/stlink/activitys/fragmentChild/activityStuClassList/CourseSignIn.java

@@ -1,7 +1,6 @@
 package com.example.stlink.activitys.fragmentChild.activityStuClassList;
 
 import android.annotation.SuppressLint;
-import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.Handler;
@@ -57,6 +56,7 @@ public class CourseSignIn extends AppCompatActivity {
     private TextInputEditText etCodeInput;
 
     private static List<CourseSign> courseHasSignedList;
+    @SuppressLint("StaticFieldLeak")
     private static StuCourseSignedAdapter adapter;
 
     private Handler signHandler;
@@ -121,24 +121,18 @@ public class CourseSignIn extends AppCompatActivity {
     }
 
     private void setClickListener(){
-        abIvTitle.setOnClickListener(new View.OnClickListener() {
+        abIvTitle.setOnClickListener(v -> finish());
-            @Override
-            public void onClick(View v) {
-                finish();
-            }
-        });
         //点击签到后的事件
-        btSign.setOnClickListener(new View.OnClickListener() {
+        btSign.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             @SuppressLint("InflateParams")
             View view = LayoutInflater.from(CourseSignIn.this).inflate(R.layout.dialog_input, null);
+            //添加取消
+            //添加"Yes"按钮
+            @SuppressLint("NotifyDataSetChanged")
             AlertDialog.Builder builder = new AlertDialog.Builder(CourseSignIn.this)
                     .setMessage("请输入签到口令")
                     .setView(view)
-                        .setPositiveButton("确定", new DialogInterface.OnClickListener() {//添加"Yes"按钮
+                    .setPositiveButton("确定", (dialogInterface, i) -> {
-                            @Override
-                            public void onClick(DialogInterface dialogInterface, int i) {
                         etCodeInput = view.findViewById(R.id.et_code_input);
                         Editable etSignCode = etCodeInput.getText();
                         if(etSignCode == null){
@@ -152,45 +146,32 @@ public class CourseSignIn extends AppCompatActivity {
                             try{
                                 signCode = Integer.parseInt(signCodeStr);
                                 stuSignRequest.setSignCode(signCode);
-                                        signHandler = new Handler(new Handler.Callback() {
+                                signHandler = new Handler(msg -> {
-                                            @Override
-                                            public boolean handleMessage(@NonNull Message msg) {
                                     if(msg.arg1 == -1){
                                         String errorMsg = (String) msg.obj;
                                         Toast.makeText(CourseSignIn.this, errorMsg, Toast.LENGTH_SHORT).show();
                                     }else if(msg.arg1 == 1){
                                         Toast.makeText(CourseSignIn.this, "签到成功", Toast.LENGTH_SHORT).show();
                                         tvSignRecord.setVisibility(View.VISIBLE);
-                                                    getSignedHandler = new Handler(new Handler.Callback() {
+                                        getSignedHandler = new Handler(msg1 -> {
-                                                        @SuppressLint("NotifyDataSetChanged")
+                                            if(msg1.arg1 == 1){
-                                                        @Override
-                                                        public boolean handleMessage(@NonNull Message msg) {
-                                                            if(msg.arg1 == 1){
                                                 adapter.notifyDataSetChanged();
                                             }
                                             return false;
-                                                        }
                                         });
                                         getHasSignedList();
                                     }
                                     return false;
-                                            }
                                 });
                                 signIn(stuSignRequest);
                             }catch ( NumberFormatException numberFormatException){
                                 Toast.makeText(CourseSignIn.this, "口令输入错误", Toast.LENGTH_SHORT).show();
                             }
                         }
-                            }
                     })
-                        .setNegativeButton("取消", new DialogInterface.OnClickListener() {//添加取消
+                    .setNegativeButton("取消", (dialogInterface, i) -> {
-                            @Override
-                            public void onClick(DialogInterface dialogInterface, int i) {
-                            }
                     })
-                        .setNeutralButton("扫码", new DialogInterface.OnClickListener() {
+                    .setNeutralButton("扫码", (dialog, which) -> {
-                            @Override
-                            public void onClick(DialogInterface dialog, int which) {
                         // 创建IntentIntegrator对象
                         IntentIntegrator intentIntegrator = new IntentIntegrator(CourseSignIn.this)
                                 .setBeepEnabled(true) //扫描提示音
@@ -200,11 +181,9 @@ public class CourseSignIn extends AppCompatActivity {
                                 .setTimeout(10000);//15秒未扫描，则将自动关闭扫码界面
                         // 开始扫描
                         intentIntegrator.initiateScan();
-                            }
                     });
             AlertDialog alertDialog2 = builder.create();
             alertDialog2.show();
-            }
         });
     }
 
@@ -212,9 +191,7 @@ public class CourseSignIn extends AppCompatActivity {
      * 获取已选课程待签到内容
      */
     private void getHasSignedList(){
-        new Thread(new Runnable() {
+        new Thread(() -> {
-            @Override
-            public void run() {
             bundle = getIntent().getExtras();
             String urlParam = ModelFieldConstants.COURSE_ID + "=" + courseId + "&" +
                     ModelFieldConstants.USER_ID + "=" + bundle.getLong(ModelFieldConstants.ID) + "&" +
@@ -251,7 +228,6 @@ public class CourseSignIn extends AppCompatActivity {
                 @Override
                 public void failedMethod(BaseResponse<Object> baseResponse) { }
             }.getConnect(url);
-            }
         }).start();
     }
 
@@ -306,15 +282,11 @@ public class CourseSignIn extends AppCompatActivity {
                         }else if(msg.arg1 == 1){
                             Toast.makeText(CourseSignIn.this, "签到成功", Toast.LENGTH_SHORT).show();
                             tvSignRecord.setVisibility(View.VISIBLE);
-                            getSignedHandler = new Handler(new Handler.Callback() {
+                            getSignedHandler = new Handler(msg1 -> {
-                                @SuppressLint("NotifyDataSetChanged")
+                                if(msg1.arg1 == 1){
-                                @Override
-                                public boolean handleMessage(@NonNull Message msg) {
-                                    if(msg.arg1 == 1){
                                     adapter.notifyDataSetChanged();
                                 }
                                 return false;
-                                }
                             });
                             getHasSignedList();
                         }

app/src/main/java/com/example/stlink/activitys/fragmentChild/activityStuHome/AllCourses.java

@@ -39,7 +39,7 @@ public class AllCourses extends AppCompatActivity {
     private List<Course> coursesData;
     private StuAddCourseAdapter adapter;
     private ImageView abIvTitle;
-    private static SwipeRefreshLayout srlMyRefresh;
+    private SwipeRefreshLayout srlMyRefresh;
 
     private static Bundle bundle;
     private static Handler handler;

app/src/main/java/com/example/stlink/activitys/fragmentChild/activityTeaCourse/CourseDetail.java

@@ -13,7 +13,6 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.fragment.app.Fragment;
-import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
 
 import com.example.stlink.R;
 import com.example.stlink.fragments.CourseClassListFragment;
@@ -125,13 +124,7 @@ public class CourseDetail extends AppCompatActivity {
      * 设置返回键点击事件
      */
     private void setListener(){
-        abIvTitle.setOnClickListener(new View.OnClickListener() {
+        abIvTitle.setOnClickListener(v -> finish());
-            @Override
-            public void onClick(View v) {
-
-                finish();
-            }
-        });
     }
 
     private void initPager(){
@@ -146,9 +139,7 @@ public class CourseDetail extends AppCompatActivity {
     }
 
     private void getCourseDetail(){
-        new Thread(new Runnable() {
+        new Thread(() -> {
-            @Override
-            public void run() {
 
             long courseId = bundle.getLong(ModelFieldConstants.COURSE_ID);
             long userId = bundle.getLong(ModelFieldConstants.USER_ID);
@@ -185,7 +176,6 @@ public class CourseDetail extends AppCompatActivity {
                     handler .sendMessage(message);
                 }
             }.getConnect(url);
-            }
         }).start();
     }
 }

app/src/main/java/com/example/stlink/activitys/fragmentChild/activityTeaHome/CheckCourseSign.java

@@ -3,9 +3,6 @@ package com.example.stlink.activitys.fragmentChild.activityTeaHome;
 import android.app.Activity;
 import android.app.Dialog;
 import android.content.Intent;
-import android.content.pm.ApplicationInfo;
-import android.content.pm.PackageInfo;
-import android.content.pm.PackageManager;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.PixelFormat;
@@ -20,19 +17,14 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.TextView;
-import android.widget.Toast;
 
 import androidx.activity.result.ActivityResultLauncher;
 import androidx.activity.result.contract.ActivityResultContracts;
-import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AppCompatActivity;
-import androidx.core.content.FileProvider;
 import androidx.fragment.app.Fragment;
 
-import com.example.stlink.BuildConfig;
 import com.example.stlink.R;
-import com.example.stlink.activitys.fragmentChild.activityStuClassList.CourseSignIn;
 import com.example.stlink.fragments.DidNotSignListFragment;
 import com.example.stlink.fragments.LeaveListFragment;
 import com.example.stlink.fragments.SignListFragment;
@@ -49,10 +41,8 @@ import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.internal.LinkedTreeMap;
 
-import java.io.File;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Objects;
 
 public class CheckCourseSign extends AppCompatActivity {
 

app/src/main/java/com/example/stlink/activitys/fragmentChild/activityTeaHome/CreateCourse.java

@@ -1,14 +1,11 @@
 package com.example.stlink.activitys.fragmentChild.activityTeaHome;
 
 import android.annotation.SuppressLint;
-import android.database.Cursor;
 import android.graphics.Color;
-import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
-import android.provider.MediaStore;
 import android.text.TextUtils;
 import android.view.View;
 import android.widget.Button;

app/src/main/java/com/example/stlink/activitys/fragmentChild/activityTeaHome/CreateSign.java

@@ -6,7 +6,6 @@ import android.content.pm.PackageManager;
 import android.graphics.Bitmap;
 import android.location.LocationManager;
 import android.net.Uri;
-import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
@@ -19,9 +18,7 @@ import android.widget.Toast;
 
 import androidx.activity.result.ActivityResultLauncher;
 import androidx.activity.result.contract.ActivityResultContracts;
-import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import androidx.annotation.RequiresApi;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.AppCompatButton;
 import androidx.core.content.ContextCompat;
@@ -41,8 +38,6 @@ import com.google.android.material.timepicker.MaterialTimePicker;
 import com.google.android.material.timepicker.TimeFormat;
 
 import java.text.ParseException;
-import java.time.LocalDateTime;
-import java.time.format.DateTimeFormatter;
 import java.util.Objects;
 
 public class CreateSign extends AppCompatActivity {
@@ -207,9 +202,7 @@ public class CreateSign extends AppCompatActivity {
             etStartTime.setText(startTime);
             hasChooseStartTime = true;
         });
-        endTimePicker.addOnPositiveButtonClickListener(new View.OnClickListener() {
+        endTimePicker.addOnPositiveButtonClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             int endHour = endTimePicker.getHour();
             int endMin = endTimePicker.getMinute();
             String endTime = currYear + "-" +
@@ -224,7 +217,6 @@ public class CreateSign extends AppCompatActivity {
             }
             etEndTime.setText(endTime);
             hasChooseEndTime = true;
-            }
         });
         //课程开始时间
         etStartTime.setOnClickListener(v -> {

app/src/main/java/com/example/stlink/activitys/fragmentChild/activityUserInfo/ModifyUserInfo.java

@@ -9,7 +9,6 @@ import android.os.Looper;
 import android.os.Message;
 import android.text.Editable;
 import android.text.TextWatcher;
-import android.view.View;
 import android.widget.ImageView;
 import android.widget.TextView;
 import android.widget.Toast;
@@ -81,7 +80,9 @@ public class ModifyUserInfo extends AppCompatActivity {
                 }else{
                     tiNewMsg.setText("");
                 }
+                if(tiNewMsg.getText() != null){
                     tiNewMsg.setSelection(tiNewMsg.getText().length());
+                }
                 break;
             }
             case ModelFieldConstants.COLLEGE_NAME : {
@@ -92,7 +93,9 @@ public class ModifyUserInfo extends AppCompatActivity {
                 }else{
                     tiNewMsg.setText("");
                 }
+                if(tiNewMsg.getText() != null){
                     tiNewMsg.setSelection(tiNewMsg.getText().length());
+                }
                 break;
             }
             case ModelFieldConstants.REAL_NAME : {
@@ -103,7 +106,9 @@ public class ModifyUserInfo extends AppCompatActivity {
                 }else{
                     tiNewMsg.setText("");
                 }
+                if(tiNewMsg.getText() != null){
                     tiNewMsg.setSelection(tiNewMsg.getText().length());
+                }
                 break;
             }
             case ModelFieldConstants.ID_NUMBER : {
@@ -118,7 +123,9 @@ public class ModifyUserInfo extends AppCompatActivity {
                 }else{
                     tiNewMsg.setText("");
                 }
+                if(tiNewMsg.getText() != null){
                     tiNewMsg.setSelection(tiNewMsg.getText().length());
+                }
                 break;
             }
             case ModelFieldConstants.GENDER : {
@@ -138,36 +145,24 @@ public class ModifyUserInfo extends AppCompatActivity {
                 tiNewMsg.setKeyListener(null);
 
 
-                tiNewMsg.setOnClickListener(new View.OnClickListener() {
+                tiNewMsg.setOnClickListener(v -> {
-                    @Override
-                    public void onClick(View v) {
                     System.out.println("choose gender............");
                     String[] singleItems = {"男", "女"};
-                        int checkedItem = "男".equals(tiNewMsg.getText().toString()) ? 0 : 1;
+                    int checkedItem = 0;
+                    if(tiNewMsg.getText() != null){
+                        checkedItem = "男".equals(tiNewMsg.getText().toString()) ? 0 : 1;
+                    }
 
                     MaterialAlertDialogBuilder materialAlertDialogBuilder = new MaterialAlertDialogBuilder(ModifyUserInfo.this)
                         .setTitle("请选择性别")
-                            .setNeutralButton(getString(R.string.cancel), new DialogInterface.OnClickListener() {
+                        .setNeutralButton(getString(R.string.cancel), (dialog, which) -> {
-                                @Override
-                                public void onClick(DialogInterface dialog, int which) {
 
-                                }
                         })
-                            .setPositiveButton(getString(R.string.ok), new DialogInterface.OnClickListener() {
+                        .setPositiveButton(getString(R.string.ok), (dialog, which) ->
-                                @Override
+                                tiNewMsg.setText(singleItems[bundle.getInt("checkedItem")]))
-                                public void onClick(DialogInterface dialog, int which) {
+                        .setSingleChoiceItems(singleItems, checkedItem, (dialog, which) ->
-                                    tiNewMsg.setText(singleItems[bundle.getInt("checkedItem")]);
+                                bundle.putInt("checkedItem", which));
-                                }
-                            })
-                            .setSingleChoiceItems(singleItems, checkedItem, new DialogInterface.OnClickListener() {
-                                @Override
-                                public void onClick(DialogInterface dialog, int which) {
-                                    bundle.putInt("checkedItem", which);
-                                }
-                            });
                     materialAlertDialogBuilder.show();
-                    }
-
                 });
                 break;
             }
@@ -179,7 +174,9 @@ public class ModifyUserInfo extends AppCompatActivity {
                 }else{
                     tiNewMsg.setText("");
                 }
+                if (tiNewMsg.getText() != null){
                     tiNewMsg.setSelection(tiNewMsg.getText().length());
+                }
                 break;
             }
             case ModelFieldConstants.PHONE : {
@@ -190,11 +187,14 @@ public class ModifyUserInfo extends AppCompatActivity {
                 }else{
                     tiNewMsg.setText("");
                 }
+                if(tiNewMsg.getText() != null){
                     tiNewMsg.setSelection(tiNewMsg.getText().length());
+                }
                 break;
             }
             default:{
-                tiNewMsg.setText("error.....");
+                String errorText = "error.....";
+                tiNewMsg.setText(errorText);
             }
         }
     }
@@ -204,12 +204,7 @@ public class ModifyUserInfo extends AppCompatActivity {
      */
     private void setListener(){
         //返回上一个活动，也就是个人信息部分
-        abIvTitle.setOnClickListener(new View.OnClickListener() {
+        abIvTitle.setOnClickListener(v -> finish());
-            @Override
-            public void onClick(View v) {
-                finish();
-            }
-        });
         tiNewMsg.addTextChangedListener(new TextWatcher() {
             @Override
             public void beforeTextChanged(CharSequence s, int start, int count, int after) {
@@ -224,12 +219,7 @@ public class ModifyUserInfo extends AppCompatActivity {
                 abBtSave.setBackgroundResource(R.drawable.selector_bottom_modify_info_save_2);
                 abBtSave.setTextColor(Color.WHITE);
                 //为按钮添加点击事件
-                abBtSave.setOnClickListener(new View.OnClickListener() {
+                abBtSave.setOnClickListener(v -> dialog());
-                    @Override
-                    public void onClick(View v) {
-                        dialog();
-                    }
-                });
             }
 
             @Override
@@ -244,6 +234,7 @@ public class ModifyUserInfo extends AppCompatActivity {
      */
     private void dialog(){
 
+        //添加取消
         AlertDialog alertDialog2 = new AlertDialog.Builder(this)
             .setMessage("请确认是否进行" + abTvTitle.getText())
             .setPositiveButton("确定", new DialogInterface.OnClickListener() {//添加"Yes"按钮
@@ -259,10 +250,7 @@ public class ModifyUserInfo extends AppCompatActivity {
                     };
                 }
             })
-            .setNegativeButton("取消", new DialogInterface.OnClickListener() {//添加取消
+            .setNegativeButton("取消", (dialogInterface, i) -> {
-                @Override
-                public void onClick(DialogInterface dialogInterface, int i) {
-                }
             })
             .create();
         alertDialog2.show();
@@ -272,9 +260,7 @@ public class ModifyUserInfo extends AppCompatActivity {
      * 更新信息网络请求
      */
     private void modifyInfo(){
-        new Thread(new Runnable() {
+        new Thread(() -> {
-            @Override
-            public void run() {
             JSONObject jsonObject = new JSONObject();
             boolean isLegalInput = false;
             try {
@@ -320,7 +306,7 @@ public class ModifyUserInfo extends AppCompatActivity {
                     try {
                         String msg = Objects.requireNonNull(tiNewMsg.getText()).toString();
                         //判断输入电话号码是否能解析为long型，能解析的话说明输入没有非法字符
-                            Long msgLong = Long.parseLong(msg);
+//                        Long msgLong = Long.parseLong(msg);
                         jsonObject.put(modifyField, msg);
                         bundle.putString(modifyField, msg);
                         isLegalInput = true;
@@ -375,7 +361,7 @@ public class ModifyUserInfo extends AppCompatActivity {
                     }
                 }
             }
-                System.out.println( "jsonObject : " + jsonObject.toString() + "..............................");
+            System.out.println( "jsonObject : " + jsonObject + "..............................");
             String json = jsonObject.toString();
             String url = UrlConstants.USER_UPDATE;
 
@@ -396,7 +382,6 @@ public class ModifyUserInfo extends AppCompatActivity {
                     }
                 }.postConnect(url, json);
             }
-            }
         }).start();
     }
 }

app/src/main/java/com/example/stlink/activitys/fragmentChild/activityUserInfo/UserInfoRecord.java

@@ -33,11 +33,6 @@ public class UserInfoRecord extends AppCompatActivity {
 
     private void setClickListener(){
         //返回上一个活动，也就是个人信息部分
-        abIvTitle.setOnClickListener(new View.OnClickListener() {
+        abIvTitle.setOnClickListener(v -> finish());
-            @Override
-            public void onClick(View v) {
-                finish();
-            }
-        });
     }
 }

app/src/main/java/com/example/stlink/activitys/fragmentChild/activityUserInfo/UserInfoSetting.java

@@ -2,7 +2,6 @@ package com.example.stlink.activitys.fragmentChild.activityUserInfo;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.view.View;
 import android.widget.Button;
 import android.widget.ImageView;
 
@@ -38,30 +37,16 @@ public class UserInfoSetting extends AppCompatActivity {
     }
 
     private void setClickListener(){
-        btExit.setOnClickListener(new View.OnClickListener() {
+        btExit.setOnClickListener(v ->
-            @Override
+                CommonUtils.exitApp(UserInfoSetting.this));
-            public void onClick(View v) {
-//                finish();//这个只是从方法栈中移除了当前活动
-//                System.exit(0); //同上
-                CommonUtils.exitApp(UserInfoSetting.this);
-            }
-        });
 
-        btLoginOut.setOnClickListener(new View.OnClickListener() {
+        btLoginOut.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             Intent intent = new Intent(UserInfoSetting.this, IdChooseActivity.class);
             //退出登录后，禁止再退回来
             intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK|Intent.FLAG_ACTIVITY_NEW_TASK);
             startActivity(intent);
-            }
         });
         //返回上一个活动，也就是个人信息部分
-        abIvTitle.setOnClickListener(new View.OnClickListener() {
+        abIvTitle.setOnClickListener(v -> finish());
-            @Override
-            public void onClick(View v) {
-                finish();
-            }
-        });
     }
 }

app/src/main/java/com/example/stlink/configs/adapter/LocationPoiAdapter.java

@@ -81,6 +81,7 @@ public class LocationPoiAdapter extends RecyclerView.Adapter<LocationPoiAdapter.
             tvBuildingDescription = itemView.findViewById(R.id.tv_building_description);
         }
 
+        @NonNull
         @Override
         public String toString() {
             return "ViewHolder{" +

app/src/main/java/com/example/stlink/configs/adapter/StuAddCourseAdapter.java

@@ -119,6 +119,7 @@ public class StuAddCourseAdapter extends RecyclerView.Adapter<StuAddCourseAdapte
         holder.ivRight.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
+                //添加取消
                 AlertDialog alertDialog2 = new AlertDialog.Builder(mContext)
                     .setMessage("确认加入课程")
                     .setPositiveButton("确定", new DialogInterface.OnClickListener() {//添加"Yes"按钮
@@ -141,10 +142,7 @@ public class StuAddCourseAdapter extends RecyclerView.Adapter<StuAddCourseAdapte
                             };
                         }
                     })
-                    .setNegativeButton("取消", new DialogInterface.OnClickListener() {//添加取消
+                    .setNegativeButton("取消", (dialogInterface, i) -> { })
-                        @Override
-                        public void onClick(DialogInterface dialogInterface, int i) { }
-                    })
                     .create();
                 alertDialog2.show();
             }
@@ -155,9 +153,7 @@ public class StuAddCourseAdapter extends RecyclerView.Adapter<StuAddCourseAdapte
      * 更新信息网络请求
      */
     private void deleteCourse(int position){
-        new Thread(new Runnable() {
+        new Thread(() -> {
-            @Override
-            public void run() {
             AppCompatActivity appCompatActivity = (AppCompatActivity) mContext;
             Bundle bundle = appCompatActivity.getIntent().getExtras();
             Long courseId = mCourseData.get(position).getmCourseId();
@@ -183,7 +179,6 @@ public class StuAddCourseAdapter extends RecyclerView.Adapter<StuAddCourseAdapte
                     handler.sendMessage(message);
                 }
             }.postConnect(url, "");
-            }
         }).start();
     }
 }

app/src/main/java/com/example/stlink/configs/adapter/StuCourseSignedAdapter.java

@@ -46,9 +46,8 @@ public class StuCourseSignedAdapter extends RecyclerView.Adapter<StuCourseSigned
 
         View view = LayoutInflater.from(mContext)
                 .inflate(resourceId, parent, false);
-        ViewHolder holder = new ViewHolder(view);
 
-        return holder;
+        return new ViewHolder(view);
     }
 
     @Override

app/src/main/java/com/example/stlink/configs/adapter/StuDeleteCourseAdapter.java

@@ -112,13 +112,14 @@ public class StuDeleteCourseAdapter extends RecyclerView.Adapter<StuDeleteCourse
 
     /**
      * 添加删除事件，云端删除成功后，子线程个主线程发送信息，请求课程列表进行刷新
-     * @param holder
+     * @param holder 处理器
-     * @param position
+     * @param position 当前Item位置
      */
     public void setDeleteClickListener(ViewHolder holder, int position){
         holder.ivRight.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
+                //添加取消
                 AlertDialog alertDialog2 = new AlertDialog.Builder(mContext)
                     .setMessage("确认退出课程")
                     .setPositiveButton("确定", new DialogInterface.OnClickListener() {//添加"Yes"按钮
@@ -137,10 +138,7 @@ public class StuDeleteCourseAdapter extends RecyclerView.Adapter<StuDeleteCourse
                             };
                         }
                     })
-                    .setNegativeButton("取消", new DialogInterface.OnClickListener() {//添加取消
+                    .setNegativeButton("取消", (dialogInterface, i) -> {
-                        @Override
-                        public void onClick(DialogInterface dialogInterface, int i) {
-                        }
                     })
                     .create();
                 alertDialog2.show();
@@ -152,13 +150,11 @@ public class StuDeleteCourseAdapter extends RecyclerView.Adapter<StuDeleteCourse
      * 更新信息网络请求
      */
     private void deleteCourse(int position){
-        new Thread(new Runnable() {
+        new Thread(() -> {
-            @Override
-            public void run() {
             AppCompatActivity appCompatActivity = (AppCompatActivity) mContext;
             Bundle bundle = appCompatActivity.getIntent().getExtras();
             Long courseId = mCourseData.get(position).getmCourseId();
-                Long userId = bundle.getLong(ModelFieldConstants.ID);
+            long userId = bundle.getLong(ModelFieldConstants.ID);
             String urlParam = ModelFieldConstants.COURSE_ID + "=" + courseId + "&" +
                         ModelFieldConstants.USER_ID + "=" + userId;
             String url = UrlConstants.STUDENT_DROP + "?" + urlParam;
@@ -180,7 +176,6 @@ public class StuDeleteCourseAdapter extends RecyclerView.Adapter<StuDeleteCourse
                     handler.sendMessage(message);
                 }
             }.deleteConnect(url);
-            }
         }).start();
     }
 }

app/src/main/java/com/example/stlink/configs/adapter/TeaDeleteCourseAdapter.java

@@ -113,13 +113,14 @@ public class TeaDeleteCourseAdapter extends RecyclerView.Adapter<TeaDeleteCourse
 
     /**
      * 添加删除事件，云端删除成功后，子线程个主线程发送信息，请求课程列表进行刷新
-     * @param holder
+     * @param holder 视图
-     * @param position
+     * @param position 当前item
      */
     public void setDeleteClickListener(ViewHolder holder, int position){
         holder.ivRight.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
+                //添加取消
                 AlertDialog alertDialog2 = new AlertDialog.Builder(mContext)
                     .setMessage("确认删除课程")
                     .setPositiveButton("确定", new DialogInterface.OnClickListener() {//添加"Yes"按钮
@@ -142,10 +143,7 @@ public class TeaDeleteCourseAdapter extends RecyclerView.Adapter<TeaDeleteCourse
                             };
                         }
                     })
-                    .setNegativeButton("取消", new DialogInterface.OnClickListener() {//添加取消
+                    .setNegativeButton("取消", (dialogInterface, i) -> {
-                        @Override
-                        public void onClick(DialogInterface dialogInterface, int i) {
-                        }
                     })
                     .create();
                 alertDialog2.show();
@@ -157,13 +155,11 @@ public class TeaDeleteCourseAdapter extends RecyclerView.Adapter<TeaDeleteCourse
      * 更新信息网络请求
      */
     private void deleteCourse(int position){
-        new Thread(new Runnable() {
+        new Thread(() -> {
-            @Override
-            public void run() {
             AppCompatActivity appCompatActivity = (AppCompatActivity) mContext;
             Bundle bundle = appCompatActivity.getIntent().getExtras();
             Long courseId = mCourseData.get(position).getmCourseId();
-                Long userId = bundle.getLong(ModelFieldConstants.ID);
+            long userId = bundle.getLong(ModelFieldConstants.ID);
             String urlParam = ModelFieldConstants.COURSE_ID + "=" + courseId + "&" +
                         ModelFieldConstants.USER_ID + "=" + userId;
             String url = UrlConstants.TEACHER_COURSE + "?" + urlParam;
@@ -185,7 +181,6 @@ public class TeaDeleteCourseAdapter extends RecyclerView.Adapter<TeaDeleteCourse
                     handler.sendMessage(message);
                 }
             }.deleteConnect(url);
-            }
         }).start();
     }
 }

app/src/main/java/com/example/stlink/configs/myControls/NestedScrollableHost.java

@@ -45,11 +45,11 @@ public class NestedScrollableHost extends FrameLayout {
         return (ViewPager2) var2;
     }
 
-    private final View getChild() {
+    private View getChild() {
         return this.getChildCount() > 0 ? this.getChildAt(0) : null;
     }
 
-    private final boolean canChildScroll(int orientation, float delta) {
+    private boolean canChildScroll(int orientation, float delta) {
         boolean var5 = false;
         int direction = -((int) Math.signum(delta));
         View var10000;
@@ -57,11 +57,11 @@ public class NestedScrollableHost extends FrameLayout {
         switch (orientation) {
             case 0:
                 var10000 = this.getChild();
-                var6 = var10000 != null ? var10000.canScrollHorizontally(direction) : false;
+                var6 = var10000 != null && var10000.canScrollHorizontally(direction);
                 break;
             case 1:
                 var10000 = this.getChild();
-                var6 = var10000 != null ? var10000.canScrollVertically(direction) : false;
+                var6 = var10000 != null && var10000.canScrollVertically(direction);
                 break;
             default:
                 // throw (Throwable)(new IllegalArgumentException());
@@ -76,7 +76,7 @@ public class NestedScrollableHost extends FrameLayout {
         return super.onInterceptTouchEvent(e);
     }
 
-    private final void handleInterceptTouchEvent(MotionEvent e) {
+    private void handleInterceptTouchEvent(MotionEvent e) {
         ViewPager2 var10000 = this.getParentViewPager();
         if (var10000 != null) {
             int orientation = var10000.getOrientation();
@@ -96,11 +96,7 @@ public class NestedScrollableHost extends FrameLayout {
                     if (scaledDx > (float) this.touchSlop || scaledDy > (float) this.touchSlop) {
                         if (isVpHorizontal == scaledDy > scaledDx) {
                             this.getParent().requestDisallowInterceptTouchEvent(false);
-                        } else if (this.canChildScroll(orientation, isVpHorizontal ? dx : dy)) {
+                        } else this.getParent().requestDisallowInterceptTouchEvent(this.canChildScroll(orientation, isVpHorizontal ? dx : dy));
-                            this.getParent().requestDisallowInterceptTouchEvent(true);
-                        } else {
-                            this.getParent().requestDisallowInterceptTouchEvent(false);
-                        }
                     }
                 }
 

app/src/main/java/com/example/stlink/fragments/CourseSelectedStuFragment.java

@@ -55,23 +55,14 @@ public class CourseSelectedStuFragment extends Fragment {
     }
 
     private void setClickListener(){
-        stu1.setOnClickListener(new View.OnClickListener() {
+        stu1.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
 
-            }
         });
-        stu2.setOnClickListener(new View.OnClickListener() {
+        stu2.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
 
-            }
         });
-        stu3.setOnClickListener(new View.OnClickListener() {
+        stu3.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
 
-            }
         });
     }
 

app/src/main/java/com/example/stlink/fragments/CrsFinishedListFragment.java

@@ -141,12 +141,9 @@ public class CrsFinishedListFragment extends Fragment {
             @Override
             public void onItemLongClick(RecyclerView parent, View view, int position) { }
         });
-        srlMyRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
+        srlMyRefresh.setOnRefreshListener(() -> {
-            @Override
-            public void onRefresh() {
             refreshData();
             srlMyRefresh.setRefreshing(false);
-            }
         });
     }
 

app/src/main/java/com/example/stlink/fragments/CrsUnfinishedListFragment.java

@@ -143,12 +143,9 @@ public class CrsUnfinishedListFragment extends Fragment {
             @Override
             public void onItemLongClick(RecyclerView parent, View view, int position) { }
         });
-        srlMyRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
+        srlMyRefresh.setOnRefreshListener(() -> {
-            @Override
-            public void onRefresh() {
             refreshData();
             srlMyRefresh.setRefreshing(false);
-            }
         });
     }
 

app/src/main/java/com/example/stlink/fragments/StuClassListFragment.java

@@ -9,11 +9,9 @@ import android.os.Message;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.Toast;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import androidx.annotation.Size;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.fragment.app.Fragment;
 import androidx.recyclerview.widget.LinearLayoutManager;
@@ -32,7 +30,6 @@ import com.example.stlink.model.response.BaseResponse;
 import com.example.stlink.model.response.data.CourseData;
 import com.example.stlink.utils.httpUtils.GetUrlParamHttpUtils;
 import com.google.android.material.badge.BadgeDrawable;
-import com.google.android.material.bottomnavigation.BottomNavigationView;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.internal.LinkedTreeMap;
@@ -88,6 +85,7 @@ public class StuClassListFragment extends Fragment {
 
 
 
+    @SuppressLint("NotifyDataSetChanged")
     public static void refreshData(){
         courseIdList = new ArrayList<>();
         courseSigns = new ArrayList<>();
@@ -105,10 +103,7 @@ public class StuClassListFragment extends Fragment {
 
         getStuSelectedCourseList();
         //只有在获取当前学生所选课程的所有id之后才能遍历
-        handler = new Handler(new Handler.Callback() {
+        handler = new Handler(msg -> {
-            @SuppressLint("NotifyDataSetChanged")
-            @Override
-            public boolean handleMessage(@NonNull Message msg) {
             if(msg.arg1 == 100){
                 getToBeSignList();
                 setListener();
@@ -117,7 +112,6 @@ public class StuClassListFragment extends Fragment {
                 System.out.println("StuClassListFragment:courseSigns = " + courseSigns.toString());
             }
             return false;
-            }
         });
 
     }
@@ -142,12 +136,9 @@ public class StuClassListFragment extends Fragment {
 
             }
         });
-        srlMyRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
+        srlMyRefresh.setOnRefreshListener(() -> {
-            @Override
-            public void onRefresh() {
             refreshData();
             srlMyRefresh.setRefreshing(false);
-            }
         });
     }
 
@@ -197,9 +188,7 @@ public class StuClassListFragment extends Fragment {
      * 获取已选课程待签到内容
      */
     private static void getToBeSignList(){
-        new Thread(new Runnable() {
+        new Thread(() -> {
-            @Override
-            public void run() {
             for(Long courseId : courseIdList){
                 String urlParam = ModelFieldConstants.COURSE_ID + "=" + courseId + "&" +
                         ModelFieldConstants.USER_ID + "=" + bundle.getLong(ModelFieldConstants.ID) + "&" +
@@ -243,7 +232,6 @@ public class StuClassListFragment extends Fragment {
                     public void failedMethod(BaseResponse<Object> baseResponse) { }
                 }.getConnect(url);
             }
-            }
         }).start();
     }
 }

app/src/main/java/com/example/stlink/fragments/StuHomeFragment.java

@@ -10,7 +10,6 @@ import android.os.Message;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.Toast;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -95,13 +94,10 @@ public class StuHomeFragment extends Fragment {
         FloatDragPopupWindow floatDragPopupWindow = new FloatDragPopupWindow.Builder(mAppCompatActivity)
                 .setContentView(faButton)
                 .setPosition(0, 600)
-                .setOnClickListener(new View.OnClickListener() {
+                .setOnClickListener(v -> {
-                    @Override
-                    public void onClick(View v) {
                     Intent intent = new Intent(mAppCompatActivity, AllCourses.class);
                     intent.putExtras(mAppCompatActivity.getIntent().getExtras());
                     mAppCompatActivity.startActivity(intent);
-                    }
                 })
                 .build();
         // 显示 FloatDragPopupWindow
@@ -118,31 +114,19 @@ public class StuHomeFragment extends Fragment {
      */
     private static void setListener(View view){
         //口令输入 TODO
-        codeButton.setOnClickListener(new View.OnClickListener() {
+        codeButton.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
 
-            }
         });
         //文本输入 TODO
-        wordButton.setOnClickListener(new View.OnClickListener() {
+        wordButton.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
 
-            }
         });
-        faButton.setOnClickListener(new View.OnClickListener() {
+        faButton.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
 
-            }
         });
-        srlMyRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
+        srlMyRefresh.setOnRefreshListener(() -> {
-            @Override
-            public void onRefresh() {
             refreshData();
             srlMyRefresh.setRefreshing(false);
-            }
         });
     }
 

app/src/main/java/com/example/stlink/fragments/TeaCourseListFragment.java

@@ -95,16 +95,13 @@ public class TeaCourseListFragment extends Fragment {
      */
     private void setClickListener(){
         //点击刷新页面
-        ftBtRefresh.setOnClickListener(new View.OnClickListener() {
+        ftBtRefresh.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             int position = viewPager2.getCurrentItem();
             if (position == 0){
                 CrsUnfinishedListFragment.refreshData();
             }else{
                 CrsFinishedListFragment.refreshData();
             }
-            }
         });
     }
 }

app/src/main/java/com/example/stlink/fragments/TeaHomeFragment.java

@@ -1,6 +1,5 @@
 package com.example.stlink.fragments;
 
-import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
@@ -92,9 +91,7 @@ public class TeaHomeFragment extends Fragment{
      */
     private void setClickListener(){
         //查看签到
-        btCodeCheck.setOnClickListener(new View.OnClickListener() {
+        btCodeCheck.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             bundle = mAppCompatActivity.getIntent().getExtras();
             String nowSignCourseName = bundle.getString(ModelFieldConstants.NOW_SIGN_COURSE_NAME);
             if(nowSignCourseName != null){
@@ -108,36 +105,23 @@ public class TeaHomeFragment extends Fragment{
                 intent.putExtras(bundle);
                 startActivity(intent);
             }
-            }
         });
         //创建签到
-        btWordCheck.setOnClickListener(new View.OnClickListener() {
+        btWordCheck.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             Intent intent = new Intent(mAppCompatActivity, CreateSign.class);
             bundle = mAppCompatActivity.getIntent().getExtras();
             bundle.putInt(ModelFieldConstants.COURSE_CHOOSE_SELECT, 0);
             intent.putExtras(bundle);
             intentActivityResultLauncher.launch(intent);
-            }
         });
         //创建班级
-        btCreateClass.setOnClickListener(new View.OnClickListener() {
+        btCreateClass.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             Intent intent = new Intent(mAppCompatActivity, CreateCourse.class);
             intent.putExtras(mAppCompatActivity.getIntent().getExtras());
             intentActivityResultLauncher.launch(intent);
-            }
         });
         //管理班级
-        btManageClass.setOnClickListener(new View.OnClickListener() {
+        btManageClass.setOnClickListener(v -> vp2.setCurrentItem(1));
-            @SuppressLint("ResourceType")
-            @Override
-            public void onClick(View v) {
-                vp2.setCurrentItem(1);
-            }
-        });
     }
 
 }

app/src/main/java/com/example/stlink/fragments/UserInfoFragment.java

@@ -70,7 +70,7 @@ public class UserInfoFragment extends Fragment {
 
     /**
      * 获取UserInfoFragment实例
-     * @param str
+     * @param str 说明，，占位
      * @return 返回UserInfoFragment实例
      */
     public static UserInfoFragment newInstance(String str, AppCompatActivity appCompatActivity){
@@ -122,7 +122,7 @@ public class UserInfoFragment extends Fragment {
             Glide.with(mAppCompatActivity)
                     .load(avatar)
                     //添加圆角
-                    .apply(new RequestOptions().bitmapTransform(new RoundedCorners(10)))
+                    .apply(RequestOptions.bitmapTransform(new RoundedCorners(10)))
                     .into(ivHeadImg);
         }
         if(userName != null){
@@ -136,55 +136,37 @@ public class UserInfoFragment extends Fragment {
 
     public static void initOnClickListener(){
 
-        btSetting.setOnClickListener(new View.OnClickListener() {
+        btSetting.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             Intent intent = new Intent(mAppCompatActivity, UserInfoSetting.class);
             intent.putExtras(mAppCompatActivity.getIntent().getExtras());
             intentActivityResultLauncher.launch(intent);
-            }
         });
         //关于
-        btAbout.setOnClickListener(new View.OnClickListener() {
+        btAbout.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             Intent intent = new Intent(mAppCompatActivity, UserInfoAbout.class);
             intent.putExtras(mAppCompatActivity.getIntent().getExtras());
             intentActivityResultLauncher.launch(intent);
-            }
         });
         //分享
-        btShare.setOnClickListener(new View.OnClickListener() {
+        btShare.setOnClickListener(v -> {
-            @Override
+            shareHandler = new Handler(msg -> {
-            public void onClick(View v) {
-                shareHandler = new Handler(new Handler.Callback() {
-                    @Override
-                    public boolean handleMessage(@NonNull Message msg) {
                 if(msg.arg1 == 1){
                     Intent shareIntent = (Intent) msg.obj;
                     intentActivityResultLauncher.launch(Intent.createChooser(shareIntent, "分享apk"));
                 }
                 return false;
-                    }
             });
             shareApk();
-            }
         });
-        btRecord.setOnClickListener(new View.OnClickListener() {
+        btRecord.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             Intent intent = new Intent(mAppCompatActivity, UserInfoRecord.class);
             intent.putExtras(mAppCompatActivity.getIntent().getExtras());
             intentActivityResultLauncher.launch(intent);
-            }
         });
-        clBaseInfo.setOnClickListener(new View.OnClickListener() {
+        clBaseInfo.setOnClickListener(v -> {
-            @Override
-            public void onClick(View v) {
             Intent intent = new Intent(mAppCompatActivity, UserInfoDetail.class);
             intent.putExtras(mAppCompatActivity.getIntent().getExtras());
             intentActivityResultLauncher.launch(intent);
-            }
         });
     }
 
@@ -198,15 +180,8 @@ public class UserInfoFragment extends Fragment {
                 File apkFile = new File(applicationInfo.sourceDir);
 
                 Intent shareIntent = new Intent();
+                // 设置该意图对象作为活动发送
                 shareIntent.setAction(Intent.ACTION_SEND);
-//                // 比如发送文本形式的数据内容
-//                // 指定发送的内容
-//                shareIntent.putExtra(Intent.EXTRA_TEXT, "S.T.Link......");
-//                // 指定发送内容的类型
-//                shareIntent.setType("text/plain");
-//
-//                intentActivityResultLauncher.launch(Intent.createChooser(shareIntent, "分享"));
-
                 shareIntent.setType("*/*");
                 // 给目标应用一个临时的读授权，如果要写权限，则是FLAG_GRANT_WRITE_URI_PERMISSION
                 shareIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

app/src/main/java/com/example/stlink/model/domain/User.java

@@ -2,6 +2,8 @@ package com.example.stlink.model.domain;
 
 import android.content.Intent;
 
+import androidx.annotation.NonNull;
+
 import java.util.Date;
 
 public class User {
@@ -160,6 +162,7 @@ public class User {
         this.userName = userName;
     }
 
+    @NonNull
     @Override
     public String toString() {
         return "User{" +

app/src/main/java/com/example/stlink/model/request/AllCourseRequest.java

@@ -1,5 +1,7 @@
 package com.example.stlink.model.request;
 
+import androidx.annotation.NonNull;
+
 import com.example.stlink.model.constants.UrlConstants;
 
 public class AllCourseRequest {
@@ -24,6 +26,7 @@ public class AllCourseRequest {
         this.size = size;
     }
 
+    @NonNull
     @Override
     public String toString() {
         String retValue;

app/src/main/java/com/example/stlink/model/request/CourseCreateRequest.java

@@ -1,6 +1,6 @@
 package com.example.stlink.model.request;
 
-import com.google.gson.internal.bind.util.ISO8601Utils;
+import androidx.annotation.NonNull;
 
 public class CourseCreateRequest {
 
@@ -124,6 +124,7 @@ public class CourseCreateRequest {
         this.userName = userName;
     }
 
+    @NonNull
     @Override
     public String toString() {
         return "CourseCreateRequest{" +

app/src/main/java/com/example/stlink/model/request/CourseCreateSignRequest.java

@@ -1,5 +1,7 @@
 package com.example.stlink.model.request;
 
+import androidx.annotation.NonNull;
+
 import java.io.Serializable;
 
 /**
@@ -111,6 +113,7 @@ public class CourseCreateSignRequest implements Serializable {
         this.userId = userId;
     }
 
+    @NonNull
     @Override
     public String toString() {
         return "CourseCreateSignRequest{" +

app/src/main/java/com/example/stlink/model/request/StuSignRequest.java

@@ -1,6 +1,6 @@
 package com.example.stlink.model.request;
 
-import android.content.Intent;
+import androidx.annotation.NonNull;
 
 public class StuSignRequest {
 
@@ -43,6 +43,7 @@ public class StuSignRequest {
         this.userSignId = userSignId;
     }
 
+    @NonNull
     @Override
     public String toString() {
         return "StuSignRequest{" +

app/src/main/java/com/example/stlink/model/request/UserModifyRequest.java

@@ -1,5 +1,7 @@
 package com.example.stlink.model.request;
 
+import androidx.annotation.NonNull;
+
 public class UserModifyRequest {
 
     /**
@@ -133,6 +135,7 @@ public class UserModifyRequest {
         this.userName = userName;
     }
 
+    @NonNull
     @Override
     public String toString() {
         return "UserModifyRequest{" +

app/src/main/java/com/example/stlink/model/request/UserRegisterRequest.java

@@ -1,5 +1,7 @@
 package com.example.stlink.model.request;
 
+import androidx.annotation.NonNull;
+
 public class UserRegisterRequest {
 
     /**
@@ -41,6 +43,7 @@ public class UserRegisterRequest {
         this.userName = userName;
     }
 
+    @NonNull
     @Override
     public String toString() {
         return "UserRegisterRequest{" +

app/src/main/java/com/example/stlink/model/response/BaseResponse.java

@@ -1,5 +1,7 @@
 package com.example.stlink.model.response;
 
+import androidx.annotation.NonNull;
+
 public class BaseResponse <T> {
 
     private int code;
@@ -34,6 +36,7 @@ public class BaseResponse <T> {
         this.data = data;
     }
 
+    @NonNull
     @Override
     public String toString() {
         return "BaseResponse{" +

app/src/main/java/com/example/stlink/model/response/data/CourseData.java

@@ -1,8 +1,7 @@
 package com.example.stlink.model.response.data;
 
-import com.example.stlink.model.domain.Course;
+import androidx.annotation.NonNull;
 
-import java.util.Arrays;
 import java.util.List;
 
 public class CourseData <T> {
@@ -47,6 +46,7 @@ public class CourseData <T> {
         this.total = total;
     }
 
+    @NonNull
     @Override
     public String toString() {
         return "CourseData{" +

app/src/main/java/com/example/stlink/model/response/data/CourseDetailData.java

@@ -1,6 +1,6 @@
 package com.example.stlink.model.response.data;
 
-import com.google.gson.annotations.SerializedName;
+import androidx.annotation.NonNull;
 
 import java.io.Serializable;
 
@@ -151,6 +151,7 @@ public class CourseDetailData implements Serializable {
         this.userName = userName;
     }
 
+    @NonNull
     @Override
     public String toString() {
         return "CourseDetailData{" +

app/src/main/java/com/example/stlink/model/response/data/CourseSignMsg.java

@@ -1,5 +1,7 @@
 package com.example.stlink.model.response.data;
 
+import androidx.annotation.NonNull;
+
 public class CourseSignMsg {
 
     /**
@@ -41,6 +43,7 @@ public class CourseSignMsg {
         this.courseNum = courseNum;
     }
 
+    @NonNull
     @Override
     public String toString() {
         return "CourseSignMsg{" +

app/src/main/java/com/example/stlink/utils/CommonUtils.java

@@ -16,7 +16,6 @@ import java.nio.charset.StandardCharsets;
 import java.security.MessageDigest;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
-import java.util.Calendar;
 import java.util.Date;
 import java.util.List;
 import java.util.TimeZone;
@@ -241,7 +240,7 @@ public class CommonUtils {
         //需要加八个格林威治时间
         simpleDateFormat.setTimeZone(TimeZone.getTimeZone("GMT+8:00"));
         //如果它本来就是long类型的,则不用写这一步
-        long lt = new Long(s);
+        long lt = Long.parseLong(s);
         Date date = new Date(lt);
         res = simpleDateFormat.format(date);
         return res;

app/src/main/java/com/example/stlink/utils/MyLocationListener.java

@@ -2,7 +2,6 @@ package com.example.stlink.utils;
 
 import android.os.Handler;
 import android.os.Message;
-import android.widget.TextView;
 
 import com.baidu.location.BDAbstractLocationListener;
 import com.baidu.location.BDLocation;

app/src/main/java/com/example/stlink/utils/QRCodeUtil.java

@@ -2,7 +2,6 @@ package com.example.stlink.utils;
 
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
-import android.media.Image;
 
 import com.google.zxing.BarcodeFormat;
 import com.google.zxing.EncodeHintType;

app/src/main/java/com/example/stlink/utils/activityUtil/CheckCourseSignUtil.java

@@ -48,18 +48,10 @@ public class CheckCourseSignUtil {
      */
     public void initPage(List<Fragment> list){
         // 设置点击触发
-        tvSignList.setOnClickListener(new View.OnClickListener() {
+        tvSignList.setOnClickListener(v ->
-            @Override
+                viewPager2.setCurrentItem(0));
-            public void onClick(View v) {
+        tvCourseSignLeave.setOnClickListener(v ->
-                viewPager2.setCurrentItem(0);
+                viewPager2.setCurrentItem(2));
-            }
-        });
-        tvCourseSignLeave.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                viewPager2.setCurrentItem(2);
-            }
-        });
         // 注册页面改变的回调函数
         viewPager2.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {  //  声明页面切换后的回调函数
             @Override

app/src/main/java/com/example/stlink/utils/activityUtil/CourseDetailUtil.java

@@ -1,6 +1,5 @@
 package com.example.stlink.utils.activityUtil;
 
-import android.view.View;
 import android.widget.TextView;
 
 import androidx.appcompat.app.AppCompatActivity;
@@ -45,24 +44,12 @@ public class CourseDetailUtil {
      */
     public void initPage(List<Fragment> list){
         // 设置点击触发
-        tvCourseIntro.setOnClickListener(new View.OnClickListener() {
+        tvCourseIntro.setOnClickListener(v ->
-            @Override
+                viewPager2.setCurrentItem(0));
-            public void onClick(View v) {
+        tvCourseClassList.setOnClickListener(v ->
-                viewPager2.setCurrentItem(0);
+                viewPager2.setCurrentItem(1));
-            }
+        tvCourseSelectedStu.setOnClickListener(v ->
-        });
+                viewPager2.setCurrentItem(2));
-        tvCourseClassList.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                viewPager2.setCurrentItem(1);
-            }
-        });
-        tvCourseSelectedStu.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                viewPager2.setCurrentItem(2);
-            }
-        });
         // 注册页面改变的回调函数
         viewPager2.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {  //  声明页面切换后的回调函数
             @Override

app/src/main/java/com/example/stlink/utils/activityUtil/CreateCourseUtil.java

@@ -15,9 +15,7 @@ public class CreateCourseUtil {
 
     public static void createCourse(AppCompatActivity appCompatActivity, CourseCreateRequest courseCreateRequest, Handler handler, @Nullable String url) {
 
-        new Thread(new Runnable() {
+        new Thread(() -> {
-            @Override
-            public void run() {
             //fastJson将对象转换为JSON字符串
             String json = JSON.toJSONString(courseCreateRequest);
 
@@ -35,7 +33,6 @@ public class CreateCourseUtil {
                     handler .sendMessage(message);
                 }
             }.postConnect(url, json);
-            }
         }).start();
     }
 

app/src/main/java/com/example/stlink/utils/activityUtil/LoginUtil.java

@@ -117,9 +117,7 @@ public class LoginUtil {
      * 登录请求
      */
     private void loginRequest(){
-        new Thread(new Runnable() {
+        new Thread(() -> {
-            @Override
-            public void run() {
             // 密码要进行MD5加密
             String url = UrlConstants.USER_LOGIN + "?password=" + CommonUtils.MD5(pwd) + "&username=" + userName;
 
@@ -159,7 +157,6 @@ public class LoginUtil {
                     handler .sendMessage(message);
                 }
             }.postConnect(url, "");
-            }
         }).start();
     }
 

app/src/main/java/com/example/stlink/utils/activityUtil/MainActivityUtil.java

@@ -144,9 +144,6 @@ public class MainActivityUtil {
             Intent intent = new Intent(Intent.ACTION_MAIN);
             intent.addCategory(Intent.CATEGORY_HOME);
             appCompatActivity.startActivity(intent);
-            //退出程序代码
-//            finish(); //结束程序
-//            System.exit(0);  //退出程序
         }
     }
 

app/src/main/java/com/example/stlink/utils/activityUtil/RegisterUtil.java

@@ -101,16 +101,14 @@ public class RegisterUtil {
      */
     private void registerRequest(){
 
-        new Thread(new Runnable() {
+        new Thread(() -> {
-            @Override
-            public void run() {
             UserRegisterRequest requestObj = new UserRegisterRequest();
             //fastJson将对象转换为JSON字符串
             requestObj.setUserName(userName);
             //即将云端发送的密码要经过MD5加密，也就是异或运算和MD5的双重加密
             requestObj.setPassword(CommonUtils.MD5(pwd));
             requestObj.setRoleId( (Integer) registerActivity.getIntent().getExtras().get(ModelFieldConstants.ROLE_ID));
-                System.out.println( "requestObj : " + requestObj.toString() + "..............................");
+            System.out.println( "requestObj : " + requestObj + "..............................");
             String json = JSON.toJSONString(requestObj);
             String url = UrlConstants.USER_REGISTER;
 
@@ -131,7 +129,6 @@ public class RegisterUtil {
                     handler .sendMessage(message);
                 }
             }.postConnect(url, json);
-            }
         }).start();
     }
 }

app/src/main/java/com/example/stlink/utils/activityUtil/TeaClassListUtil.java

@@ -44,19 +44,11 @@ public class TeaClassListUtil {
      */
     public void initPage(List<Fragment> list){
         // 设置点击触发
-        tvUnfinishedCourse.setOnClickListener(new View.OnClickListener() {
+        tvUnfinishedCourse.setOnClickListener(v ->
-            @Override
+                viewPager2.setCurrentItem(0));
-            public void onClick(View v) {
-                viewPager2.setCurrentItem(0);
-            }
-        });
         System.out.println(tvUnfinishedCourse.hasOnClickListeners());
-        tvFinishedCourse.setOnClickListener(new View.OnClickListener() {
+        tvFinishedCourse.setOnClickListener(v ->
-            @Override
+                viewPager2.setCurrentItem(1));
-            public void onClick(View v) {
-                viewPager2.setCurrentItem(1);
-            }
-        });
         // 注册页面改变的回调函数
         viewPager2.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {  //  声明页面切换后的回调函数
             @Override

app/src/main/java/com/example/stlink/utils/httpUtils/DeleteUrlParamHttpUtils.java

@@ -59,17 +59,21 @@ public abstract class DeleteUrlParamHttpUtils {
          * @param e 异常
          */
         @Override
-        public void onFailure(Call call, IOException e) {
+        public void onFailure(@NonNull Call call, IOException e) {
             //Log.e(TAG, "Failed to connect server!!!");
             e.printStackTrace();
         }
 
         @Override
         public void onResponse(@NonNull Call call, Response response) throws IOException {
-            final String body = response.body().string();
+            String body = null;
+            if(response.body() != null){
+                body = response.body().string();
+            }
             Gson gson = new Gson();
             Type jsonType = new TypeToken<BaseResponse<Object>>() {}.getType();
             BaseResponse<Object> baseResponse = gson.fromJson(body, jsonType);
+            assert baseResponse != null;
             int code = baseResponse.getCode();
             //页面请求成功
             if(response.code() == 200){

app/src/main/java/com/example/stlink/utils/httpUtils/GetUrlParamHttpUtils.java

@@ -14,7 +14,6 @@ import java.lang.reflect.Type;
 
 import okhttp3.Call;
 import okhttp3.Callback;
-import okhttp3.Credentials;
 import okhttp3.Headers;
 import okhttp3.OkHttpClient;
 import okhttp3.Request;
@@ -60,13 +59,14 @@ public abstract class GetUrlParamHttpUtils {
          * @param e 异常
          */
         @Override
-        public void onFailure(Call call, IOException e) {
+        public void onFailure(@NonNull Call call, IOException e) {
             //Log.e(TAG, "Failed to connect server!!!");
             e.printStackTrace();
         }
 
         @Override
         public void onResponse(@NonNull Call call, Response response) throws IOException {
+            assert response.body() != null;
             final String body = response.body().string();
             Gson gson = new Gson();
             Type jsonType = new TypeToken<BaseResponse<Object>>() {}.getType();

app/src/main/java/com/example/stlink/utils/httpUtils/PostBodyParamHttpUtils.java

@@ -15,7 +15,6 @@ import java.lang.reflect.Type;
 
 import okhttp3.Call;
 import okhttp3.Callback;
-import okhttp3.Credentials;
 import okhttp3.Headers;
 import okhttp3.OkHttpClient;
 import okhttp3.Request;
@@ -74,13 +73,14 @@ public abstract class PostBodyParamHttpUtils {
          * @param e 异常
          */
         @Override
-        public void onFailure(Call call, IOException e) {
+        public void onFailure(@NonNull Call call, IOException e) {
             //Log.e(TAG, "Failed to connect server!!!");
             e.printStackTrace();
         }
 
         @Override
         public void onResponse(@NonNull Call call, Response response) throws IOException {
+            assert response.body() != null;
             final String body = response.body().string();
             Gson gson = new Gson();
             Type jsonType = new TypeToken<BaseResponse<Object>>() {}.getType();
@@ -115,7 +115,7 @@ public abstract class PostBodyParamHttpUtils {
                 System.out.println("response:connect...error...................");
                 System.out.println("response:code = " + response.code());
                 System.out.println("response: " + response);
-                System.out.println("baseResponse: " + baseResponse.toString());
+                System.out.println("baseResponse: " + baseResponse);
             }
 
         }

app/src/main/java/com/example/stlink/utils/httpUtils/PostFileHttpUtils.java

@@ -70,14 +70,14 @@ public abstract class PostFileHttpUtils {
          * @param e 异常
          */
         @Override
-        public void onFailure(Call call, IOException e) {
+        public void onFailure(@NonNull Call call, IOException e) {
             Log.e("TAGTAG", "onFailure，图片上传失败：" + e.getMessage());
             e.printStackTrace();
         }
 
         @Override
         public void onResponse(@NonNull Call call, Response response) throws IOException {
-
+            assert response.body() != null;
             final String body = response.body().string();
             Log.e("TAGTAG", "onResponse，图片上传成功：" + body);
             Gson gson = new Gson();