第四次实验

main/java/com/orangesale/cn/MainActivity.java

@@ -1,14 +1,19 @@
 package com.orangesale.cn;
 
 import android.content.Intent;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
+import android.widget.Toast;
 
 import androidx.appcompat.app.AppCompatActivity;
 
+import com.orangesale.cn.activity.CategoryActivity;
 import com.orangesale.cn.activity.RegisterActivity;
+import com.orangesale.cn.dataoperation.OrangeDatabase;
 
 public class MainActivity extends AppCompatActivity implements View.OnClickListener {
     private Button registerButton, loginButton;
@@ -29,6 +34,18 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
                 startActivity(intent);
                 break;
             case R.id.login:
+                //注册时，我们引入了数据库，登录这里可以通过数据库进行验证，验证跳转到首页，不通过进行提示
+                if (validateLogin()) {
+                    Intent intent1 = new Intent(MainActivity.this, CategoryActivity.class);
+                    Bundle bundle = new Bundle();
+                    OrangeDatabase orangeDatabase = new OrangeDatabase(MainActivity.this);
+                    bundle.putString("username", usernameText.getText().toString());
+                    bundle = orangeDatabase.queryUserInfo(orangeDatabase.getReadableDatabase(), bundle);
+                    intent1.putExtras(bundle);
+                    startActivity(intent1);
+                } else {
+                    Toast.makeText(MainActivity.this, "账号或者密码错误", Toast.LENGTH_SHORT).show();
+                }
                 break;
         }
     }
@@ -42,4 +59,21 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
         registerButton = findViewById(R.id.register);
         registerButton.setOnClickListener(this);
     }
+
+    /**
+     * 登录验证
+     *
+     * @return
+     */
+    private boolean validateLogin() {
+        String username = usernameText.getText().toString();
+        String password = paswdEdit.getText().toString();
+        OrangeDatabase orangeDatabase = new OrangeDatabase(MainActivity.this);
+        SQLiteDatabase sqLiteDatabase = orangeDatabase.getReadableDatabase();
+        Cursor cursor = sqLiteDatabase.rawQuery("select * from user where username=? and password=?", new String[]{username, password});
+        if (cursor.getCount() > 0) {
+            return true;
+        }
+        return false;
+    }
 }

main/java/com/orangesale/cn/activity/RegisterActivity.java

@@ -1,6 +1,8 @@
 package com.orangesale.cn.activity;
 
+import android.content.ContentValues;
 import android.content.Intent;
+import android.database.sqlite.SQLiteDatabase;
 import android.graphics.Color;
 import android.os.Bundle;
 import android.view.View;
@@ -15,6 +17,7 @@ import androidx.appcompat.app.AppCompatActivity;
 
 import com.lljjcoder.citypickerview.widget.CityPicker;
 import com.orangesale.cn.R;
+import com.orangesale.cn.dataoperation.OrangeDatabase;
 
 public class RegisterActivity extends AppCompatActivity implements View.OnClickListener, RadioGroup.OnCheckedChangeListener {
     private EditText usernameEdit, passwordEdit, surePasswordEdit;
@@ -22,7 +25,7 @@ public class RegisterActivity extends AppCompatActivity implements View.OnClickL
     private CityPicker cityPicker;
     private Button regButton;
     private RadioGroup sexGroup;
-    private String sexStr="男";
+    private String sexStr = "男";
 
 
     @Override
@@ -107,7 +110,6 @@ public class RegisterActivity extends AppCompatActivity implements View.OnClickL
      * 注册验证
      */
     public void validateRegister() {
-        Intent intent = new Intent(RegisterActivity.this, UserActivity.class);
         String username = usernameEdit.getText().toString();
         String password = passwordEdit.getText().toString();
         String surePassword = surePasswordEdit.getText().toString();
@@ -122,6 +124,11 @@ public class RegisterActivity extends AppCompatActivity implements View.OnClickL
                     bundle.putString("password", password);
                     bundle.putString("sex", sexStr);
                     bundle.putString("city", city);
+                    //本节将使用安卓自身带的SQLite数据库的方式存储注册的信息（之前直接传输显示在界面是的方式）
+                    OrangeDatabase orangeDatabase = new OrangeDatabase(RegisterActivity.this);
+                    SQLiteDatabase sqLiteDatabase = orangeDatabase.getWritableDatabase();
+                    insertData(sqLiteDatabase, bundle);
+                    Intent intent = new Intent(RegisterActivity.this, UserActivity.class);
                     intent.putExtras(bundle);
                     startActivity(intent);
                 } else {
@@ -142,4 +149,21 @@ public class RegisterActivity extends AppCompatActivity implements View.OnClickL
         //根据用户选择来改变sex的值
         sexStr = checkedId == R.id.reg_man ? "男" : "女";
     }
+
+    /**
+     * 插入数据库的值
+     *
+     * @param sqLiteDatabase
+     * @param bundle
+     */
+    private void insertData(SQLiteDatabase sqLiteDatabase, Bundle bundle) {
+        ContentValues contentValues = new ContentValues();
+        contentValues.put("username", bundle.getString("username"));
+        contentValues.put("password", bundle.getString("password"));
+        contentValues.put("sex", bundle.getString("sex"));
+        contentValues.put("city", bundle.getString("city"));
+        sqLiteDatabase.insert("user", null, contentValues);
+        sqLiteDatabase.close();
+    }
 }
+

main/java/com/orangesale/cn/activity/UserActivity.java

@@ -10,7 +10,6 @@ import android.widget.TextView;
 
 import androidx.annotation.Nullable;
 
-import com.orangesale.cn.MainActivity;
 import com.orangesale.cn.R;
 
 public class UserActivity extends Activity implements View.OnClickListener {

main/java/com/orangesale/cn/dataoperation/OrangeDatabase.java

@@ -0,0 +1,68 @@
+package com.orangesale.cn.dataoperation;
+
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+import android.os.Bundle;
+
+import androidx.annotation.Nullable;
+
+public class OrangeDatabase extends SQLiteOpenHelper {
+    public OrangeDatabase(@Nullable Context context) {
+        super(context, "0317shiyan.db", null, 1);
+    }
+
+    @Override
+    public void onCreate(SQLiteDatabase db) {
+        //创建用户表
+        String sql = "create table user(id integer primary key autoincrement, username varchar(50), password varchar(50),sex varchar(10),city carchar(50))";
+        db.execSQL(sql);
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+
+    }
+
+    /**
+     * 插入数据
+     *
+     * @param sqLiteDatabase
+     * @param username
+     * @param password
+     * @param sex
+     * @param city
+     */
+    public void insertUser(SQLiteDatabase sqLiteDatabase, String username, String password, String sex, String city) {
+        ContentValues contentValues = new ContentValues();
+        contentValues.put("username", username);
+        contentValues.put("password", password);
+        contentValues.put("sex", sex);
+        contentValues.put("city", city);
+        sqLiteDatabase.insert("user", null, contentValues);
+        sqLiteDatabase.close();
+    }
+
+    /**
+     * 查询数据
+     *
+     * @param sqLiteDatabase
+     * @param bundle
+     * @return
+     */
+    public Bundle queryUserInfo(SQLiteDatabase sqLiteDatabase, Bundle bundle) {
+        String username = bundle.getString("username");
+        Cursor cursor = sqLiteDatabase.rawQuery("select * from user where username=?", new String[]{username});
+        if (cursor != null) {
+            while (cursor.moveToNext()) {
+                bundle.putString("sex", cursor.getString(3));
+                bundle.putString("city", cursor.getString(4));
+            }
+        }
+        cursor.close();
+        sqLiteDatabase.close();
+        return bundle;
+    }
+}