create database

app/build.gradle

@@ -4,7 +4,7 @@ android {
     compileSdkVersion 30
     buildToolsVersion "30.0.2"
     defaultConfig {
-        applicationId "com.example.orangesale_01"
+        applicationId "com.example.Cat"
         minSdkVersion 23
         targetSdkVersion 30
         versionCode 1

app/src/main/java/com/example/Cat/activity/activity/RegisterActivity.java

@@ -1,9 +1,11 @@
 package com.example.Cat.activity.activity;
 
 import android.content.Intent;
+import android.database.sqlite.SQLiteDatabase;
 import android.graphics.Color;
 import android.os.Bundle;
 import android.view.View;
+import android.view.Window;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.RadioGroup;
@@ -24,10 +26,12 @@ public class RegisterActivity extends AppCompatActivity implements View.OnClickL
     private RadioGroup sexGroup;
     private String sexStr="男";
 
+    User_Database us_db;
 
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        //requestWindowFeature(Window.FEATURE_NO_TITLE);
         setContentView(R.layout.user_register);
         init();
     }
@@ -38,15 +42,18 @@ public class RegisterActivity extends AppCompatActivity implements View.OnClickL
     private void init() {
         cityText = findViewById(R.id.reg_province);
         cityText.setOnClickListener(this);
+
         usernameEdit = findViewById(R.id.reg_username);
         passwordEdit = findViewById(R.id.reg_password);
         surePasswordEdit = findViewById(R.id.reg_sure_password);
+
         regButton = findViewById(R.id.reg_register);
         regButton.setOnClickListener(this);
+
         sexGroup = findViewById(R.id.sex);
         sexGroup.setOnCheckedChangeListener(this);
-    }
 
+    }
     @Override
     public void onClick(View v) {
         switch (v.getId()) {
@@ -111,17 +118,16 @@ public class RegisterActivity extends AppCompatActivity implements View.OnClickL
         String password = passwordEdit.getText().toString();
         String surePassword = surePasswordEdit.getText().toString();
         String city = cityText.getText().toString();
+
         //判断两次密码是否输入一致
         if (password.equals(surePassword)) {
             //这里也可以再进行其它的验证，如是否符合要求等，符合就进行插入数据库操作
             if (!username.equals("") || !password.equals("")) {
                 if (!city.equals("")) {
-                    Bundle bundle = new Bundle();
+                    //调用数据库操作类的插入方法
-                    bundle.putString("username", username);
+                    us_db=new User_Database(RegisterActivity.this);
-                    bundle.putString("password", password);
+                    SQLiteDatabase sqLiteDatabase=us_db.getWritableDatabase();
-                    bundle.putString("sex", sexStr);
+                    us_db.adddata(sqLiteDatabase,username,password,sexStr,city);
-                    bundle.putString("city", city);
-                    intent.putExtras(bundle);
                     startActivity(intent);
                 } else {
                     Toast.makeText(RegisterActivity.this, "请选择地址", Toast.LENGTH_SHORT).show();

app/src/main/java/com/example/Cat/activity/activity/UserActivity.java

@@ -40,7 +40,7 @@ public class UserActivity extends Activity implements View.OnClickListener{
         userGeneralLine = findViewById(R.id.user_general);
         userProductLine = findViewById(R.id.user_product);
         userProductLine.setOnClickListener(this);
-        setData();
+        //setData();
     }
 
     /**

app/src/main/java/com/example/Cat/activity/activity/UserInfo.java

@@ -0,0 +1,47 @@
+package com.example.Cat.activity.activity;
+
+public class UserInfo {
+    int id;
+    String username;
+    String paswd, sex;
+    String city;
+    public UserInfo(int id,String username, String paswd, String sex, String city){
+        this.id=id;
+        this.username = username;
+        this.paswd = paswd;
+        this.sex = sex;
+        this.city = city;
+    }
+    public void setId(int id) {
+        this.id = id;
+    }
+    public void setUsername(String username) {
+        this.username = username;
+    }
+    public void setPaswd(String paswd) {
+        this.paswd = paswd;
+    }
+    public void setSex(String sex) {
+        this.sex = sex;
+    }
+    public void setCity(String city) {
+        this.city = city;
+    }
+    public int getId() {
+        return id;
+    }
+    public String getUsername() {
+        return username;
+    }
+    public String getPaswd() {
+        return paswd;
+    }
+    public String getSex() {
+        return sex;
+    }
+    public String getCity() {
+        return city;
+    }
+
+}
+

app/src/main/java/com/example/Cat/activity/activity/User_Database.java

@@ -0,0 +1,114 @@
+package com.example.Cat.activity.activity;
+
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+import android.util.Log;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class User_Database extends SQLiteOpenHelper {
+    Context context;
+    public User_Database(Context context) {
+        super(context, "user_db", null, 1);
+        this.context=context;
+        System.out.println("in User_Database ,context="+ context);
+    }
+
+    @Override
+    public void onCreate(SQLiteDatabase sqLiteDatabase) {
+        System.out.println("onCreate");
+        String sql = "create table user(" +
+                "id integer primary key autoincrement," +
+                "username varchar(20),paswd varchar(20)," +
+                "sex varchar(20)," +
+                "city longtext)";
+        sqLiteDatabase.execSQL(sql);
+        Log.i("SQLite","execSQL(sql)");
+    }
+
+    //数据库版本号更新时调用
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+    }
+
+    //添加数据
+
+    public void adddata(SQLiteDatabase sqLiteDatabase, String username, String paswd, String sex, String city) {
+        ContentValues values = new ContentValues();
+        values.put("username", username);
+        values.put("paswd", paswd);
+        values.put("sex", sex);
+        values.put("city", city);
+        sqLiteDatabase.insert("user", null, values);
+        //sqLiteDatabase.close();
+    }
+
+    //删除数据
+    public void delete(SQLiteDatabase sqLiteDatabase, int id) {
+        /*第一个参数：表名；第二个参数：需要删除的属性名，？代表占位符；第三个参数：属性名的属性值*/
+        sqLiteDatabase.delete("user", "id=?", new String[]{id + ""});
+        sqLiteDatabase.close();
+    }
+
+    //更新数据
+    public void update(SQLiteDatabase sqLiteDatabase, int id, String username,
+                       String paswd, String sex, String city) {
+        //创建一个ContentValues对象
+        ContentValues values = new ContentValues();
+        //以键值对的形式插入
+        values.put("username", username);
+        values.put("paswd", paswd);
+        values.put("sex", sex);
+        values.put("city", city);
+        //执行修改的方法
+        sqLiteDatabase.update("user", values, "id=?", new String[]{id + ""});
+        sqLiteDatabase.close();
+    }
+
+    //查询全部数据
+    public List<UserInfo> querydata(SQLiteDatabase sqLiteDatabase) {
+        Cursor cursor = sqLiteDatabase.query("user", null, null, null, null, null, "id ASC");
+        List<UserInfo> list = new ArrayList<UserInfo>();
+        while (cursor.moveToNext()) {
+            int id = cursor.getInt(cursor.getColumnIndex("id"));
+            Log.i("SQLite","id="+id);
+            String username = cursor.getString(1);
+            Log.i("SQLite","username="+username);
+            String paswd = cursor.getString(2);
+            Log.i("SQLite","paswd="+paswd);
+            String sex = cursor.getString(3);
+            Log.i("SQLite","sex="+sex);
+            String city = cursor.getString(4);
+            Log.i("SQLite","city="+city);
+            list.add(new UserInfo(id, username, paswd, sex, city));
+        }
+        cursor.close();
+        sqLiteDatabase.close();
+        return list;
+    }
+    public List<UserInfo> queryByname(SQLiteDatabase sqLiteDatabase,String name) {
+        Cursor cursor = sqLiteDatabase.query("user", null, "name=?", new String[]{name}, null, null, "id ASC");
+        List<UserInfo> list = new ArrayList<UserInfo>();
+        while (cursor.moveToNext()) {
+            int id = cursor.getInt(cursor.getColumnIndex("id"));
+            Log.i("SQLite","id="+id);
+            String username = cursor.getString(1);
+            Log.i("SQLite","username="+username);
+            String paswd = cursor.getString(2);
+            Log.i("SQLite","paswd="+paswd);
+            String sex = cursor.getString(3);
+            Log.i("SQLite","sex="+sex);
+            String city = cursor.getString(4);
+            list.add(new UserInfo(id, username, paswd, sex, city));
+        }
+        cursor.close();
+        sqLiteDatabase.close();
+        return list;
+    }
+
+}
+

app/src/main/res/layout/user_register.xml

@@ -165,4 +165,5 @@
         android:textColor="#FFFFFF"
         android:text="注    册" />
 
+
 </LinearLayout>