android 使用SQLite对数据进行增删改查、访问

功能：用SQLitem完成数据库的动态增删改查功能，数据的存储于访问   SQLite数据库编程  SimpleCursorAdapter和上下文菜单基本用法   

开发平台：Android Studio 3.0.1

整体框架：

见代码及注释：

MainActivity.java:

package com.example.test_4application;

import android.app.Activity;
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.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

    private static int DB_VERSION=1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button bt1=(Button) findViewById(R.id.button1);
        Button bt2=(Button) findViewById(R.id.button2);
        Button bt3=(Button) findViewById(R.id.button3);
        Button bt4=(Button) findViewById(R.id.button4);
        Button bt5=(Button) findViewById(R.id.button5);
        Button bt6=(Button) findViewById(R.id.button6);
        TextView tv=(TextView)findViewById(R.id.textView1);



        View.OnClickListener listener=new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                switch (v.getId()){
                    case R.id.button1:
                       createdb();
                       break;
                    case R.id.button2:
                        Person person=new Person();
                        person.name="wustzz";
                        person.age=39;
                        insert(person);
                        break;
                    case R.id.button3:
                        deleteById(1);
                        break;

                    case R.id.button4:
                        Person person1=new Person();
                        person1.name="wustzz";
                        person1.age=39;
                        updateById(1,person1);
                        break;

                    case R.id.button5:
                        find();
                        break;

                }
            }
        };


        bt1.setOnClickListener(listener);
        bt2.setOnClickListener(listener);
        bt3.setOnClickListener(listener);
        bt4.setOnClickListener(listener);
        bt5.setOnClickListener(listener);
        bt6.setOnClickListener(listener);


    }

    public void createdb(){
        DBHelper helper = new DBHelper(getApplicationContext(), "test.db", null,DB_VERSION);
        //调用getWritableDatabase()或getReadableDatabase()才会真正创建或打开
        SQLiteDatabase db=helper.getWritableDatabase();
        db.close(); //操作完成后关闭数据库连接
        Toast.makeText(getApplicationContext(), "数据库创建成功", Toast.LENGTH_SHORT).show();
    }


    public void insert(Person person){
        DBHelper helper = new DBHelper(getApplicationContext(), "test.db", null,DB_VERSION);
        SQLiteDatabase db=helper.getWritableDatabase();
        db.execSQL("INSERT INTO person VALUES (NULL, ? , ? )",
                new Object[ ] { person.name, person.age } );
        db.close();
        Toast.makeText(getApplicationContext(), "记录添加成功", Toast.LENGTH_SHORT).show();
    }


    public void deleteById(int id){
        DBHelper helper = new DBHelper(getApplicationContext(), "test.db", null,DB_VERSION);
        SQLiteDatabase db=helper.getWritableDatabase();
        db.execSQL( "Delete from person where id= ? " , new Object[ ]{id} );
        db.close();
        Toast.makeText(getApplicationContext(), "记录删除成功", Toast.LENGTH_SHORT).show();
    }

    public void updateById(int id, Person person){
        DBHelper helper = new DBHelper(getApplicationContext(), "test.db", null,DB_VERSION);
        SQLiteDatabase db=helper.getWritableDatabase();
        db.execSQL("Update person set name= ? , age= ? where id= ? ",
                new Object[ ]{ person.name,person.age, id } );
        db.close();
        Toast.makeText(getApplicationContext(), "记录修改成功", Toast.LENGTH_SHORT).show();
    }

    public void find(){

/*
        DBHelper helper = new DBHelper(getApplicationContext(), "test.db", null,DB_VERSION);
        SQLiteDatabase db=helper.getWritableDatabase();
        Cursor cursor = db.rawQuery( "SELECT * FROM person where age>?", new String[]{"10"} );
        TextView tv=(TextView)findViewById(R.id.textView_list); //简单用TextView显示一下数据
        tv.setText("查询到"+cursor.getCount()+"条记录(当前数据库版本号="+DB_VERSION+")");
        while (cursor.moveToNext()) { //遍历结果集
            int id = cursor.getInt(cursor.getColumnIndex("id") );
            String name = cursor.getString(cursor.getColumnIndex("name") );
            int age = cursor.getInt(cursor.getColumnIndex("age") );
            tv.setText(tv.getText()+"\n"+"id="+id+",name="+name+",age="+age);
        }
        cursor.close(); //关闭cursor
        db.close(); //关闭数据库连接
*/

        Intent it = new Intent( MainActivity.this, ShowActivity.class );
        startActivity(it);



    }


}

上述的删改都是静态删改，且都未指定要删改的对象，读者自己可以指定id来删改。删改功能后面有动态删改实现，不同代码指定，直接在界面上完成。

activity_main.xml 代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="创建数据库和表" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="添加记录" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="删除记录" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="修改记录" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="查询记录" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button6"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="更新数据库" />
    </LinearLayout>

    <TextView
        android:id="@+id/textView_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="TextView"
        android:textSize="24sp" />
</LinearLayout>

DBHelper.java 代码（创建数据库和表）：

package com.example.test_4application;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

/**
 * Created by lenovo on 2018/4/28.
 */

public class DBHelper extends SQLiteOpenHelper {
    public DBHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
        super(context, name, factory, version);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("CREATE TABLE IF NOT EXISTS person ("
                + "id INTEGER PRIMARY KEY AUTOINCREMENT,"
                + "name VARCHAR(20),"
                + "age SMALLINT)");

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS person"); //删除数据表，谨慎使用
        onCreate(db); //重新建表
    }

}

Person.java 代码（创建数据模型）：

package com.example.test_4application;

/**
 * Created by lenovo on 2018/4/28.
 */

public class Person {

    public int id;
    public String name;
    public int age;


    public Person(){

    }

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

}

//本实验定义人的基本信息数据模型类Person

ShowActivity.java 代码：

package com.example.test_4application;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
import android.widget.Toast;

public class ShowActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_show);



        DBHelper helper = new DBHelper(getApplicationContext(), "test.db", null,1);
        SQLiteDatabase db=helper.getWritableDatabase();
        Cursor cursor = db.rawQuery( "SELECT id as _id, name,age FROM Person",null);
                String[] from = { "_id", "name", "age" };
        int[] to = { R.id.txtID, R.id.txtName, R.id.txtAge };
        SimpleCursorAdapter adapter = new SimpleCursorAdapter(
                this, R.layout.listview, cursor, from, to);//使用SimpleCursorAdapter填充ListView

        //cursor.close();不能close()，否则SimpleCursorAdapter将不能从Cursor中读取数据显示
        ListView li=(ListView)findViewById(R.id.listView1);
        li.setAdapter(adapter);
        TextView tv=(TextView)findViewById(R.id.textView_rem);
        tv.setText("查询到"+cursor.getCount()+"条记录");


        ListView list1=(ListView)findViewById(R.id.listView1);
        registerForContextMenu( list1 );  //将上下文菜单注册到ListView上


        Button bt1= (Button)findViewById(R.id.button_add); //注意id值
        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                Intent intent=new Intent(ShowActivity.this,InsertActivity.class);
                startActivityForResult(intent, 100);
            }
        });





    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode==100)
            if(resultCode==RESULT_OK){
                onCreate(null);
            } // 100表明是来自于InsertActivity的回传


        if(requestCode==200)  //200表明是来自于InsertActivity的回传
            if(resultCode==RESULT_OK) {
                onCreate(null);   //ShowActivity重新执行onCreate，即完成刷新
            }

    }


    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
                                    ContextMenu.ContextMenuInfo menuInfo) {
        menu.setHeaderTitle("操作");
        getMenuInflater().inflate(R.menu.managa, menu);
    }


    @Override
    public boolean onContextItemSelected(MenuItem item) {  //添加上下文菜单选中项方法
        switch ( item.getItemId() ) {
            case R.id.delete:
                delete(item); //代码见后
                return true;
            case R.id.update :
                update(item); //代码见后
                return true;
            default:
                return false;
        }
    }

//删除：根据id值作为删除记录的条件       

    public void delete(MenuItem item){
        final AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo)item.getMenuInfo();
        if(info.id>0){
            new AlertDialog.Builder(this).setTitle("删除" + info.id)
                    .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            DBHelper helper = new DBHelper(getApplicationContext(), "test.db", null,1);
                            SQLiteDatabase db=helper.getWritableDatabase();
                            db.execSQL( "Delete from person where id= ? ", new Object[ ]{ info.id } );
                            db.close();
                            Toast.makeText(getApplicationContext(), "记录删除成功", Toast.LENGTH_SHORT).show();
                            onCreate(null); //重新加载一次Activity，刷新
                        }
                    })
                    .setNegativeButton("取消", null) .show();
        }
    }

//修改：将id值及其他字段的值传到UpdateActivity显示和修改  将当前选中行的id、name、age字段值送到UpdateActivity中去修改，后者回传信息

public void update(MenuItem item){ final AdapterView.AdapterContextMenuInfo info= (AdapterView.AdapterContextMenuInfo)item.getMenuInfo(); Intent intent = new Intent(ShowActivity. this, UpdateActivity. class); Bundle bundle= new Bundle(); bundle.putString( "id", String. valueOf(info. id)); bundle.putString( "username",((TextView)info. targetView.findViewById(R.id. txtName)).getText().toString()); bundle.putString( "age",((TextView)info. targetView.findViewById(R.id. txtAge)).getText().toString()); intent.putExtras(bundle); startActivityForResult(intent, 200); }}

activity_show.xml 代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:layout_weight="1"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView_rem"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="8" />

        <Button
            android:id="@+id/button_add"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="添加"
            android:textSize="24sp" />
    </LinearLayout>

    <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1" />

</LinearLayout>

InsertActivity.java 代码：

package com.example.test_4application;

import android.app.Activity;
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;

public class InsertActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_insert);



        Button bt1= (Button)findViewById(R.id.newRec);
        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                EditText et1=(EditText)findViewById(R.id.editText1);
                EditText et2=(EditText)findViewById(R.id.editText2);
                Person person=new Person(et1.getText().toString(), Integer.parseInt(et2.getText().toString()));
                insert(person);  
                 setResult(RESULT_OK, null);  //不回传intent可设为null
                 finish();
            }
        });
    }




    public void insert(Person person){
        DBHelper helper = new DBHelper(getApplicationContext(), "test.db", null,1);
        SQLiteDatabase db=helper.getWritableDatabase();
        String sql="INSERT INTO person VALUES (NULL, ?, ?)";
        db.execSQL(sql, new Object[ ] { person.name, person.age } );
        db.close();
        Toast.makeText(getApplicationContext(), "记录添加成功",
                Toast.LENGTH_SHORT).show();
    }

}

avtivity_insert.xml 代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="姓名"
            android:textSize="24sp" />

        <EditText
            android:id="@+id/editText1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:inputType="textPersonName" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="年龄"
            android:textSize="24sp" />

        <EditText
            android:id="@+id/editText2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:inputType="textPersonName" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:orientation="horizontal">

        <Button
            android:id="@+id/newRec"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="保存"
            android:textSize="24sp" />

        <Button
            android:id="@+id/button_cancel1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="取消"
            android:textSize="24sp" />
    </LinearLayout>
</LinearLayout>

UpdateActivity.java 代码：

package com.example.test_4application;

import android.app.Activity;
import android.content.Intent;
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;

public class UpdateActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_update);


        Intent intent=getIntent();
        Bundle bundle=intent.getExtras();
        String id=bundle.getString("id");
        String name=bundle.getString("username");
        String age=bundle.getString("age");
        final EditText et1=(EditText)findViewById(R.id.editText3);
        final EditText et2=(EditText)findViewById(R.id.editText4);
        final EditText et3=(EditText)findViewById(R.id.editText5);
        et1.setText(id);
        et2.setText(name);
        et3.setText(age);
//显示ShowActivity传来的id、name、age字段值


        Button bt1= (Button)findViewById(R.id.button_save);
        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                DBHelper helper = new DBHelper(getApplicationContext(), "test.db", null,1);
                SQLiteDatabase db=helper.getWritableDatabase();
                //更新数据，id值不能修改
                db.execSQL("Update person set name= ? , age=? where id=?", new Object[ ]{ et2.getText().toString(),et3.getText().toString(),et1.getText().toString() } );
                db.close();
                Toast.makeText(getApplicationContext(), "记录修改成功", Toast.LENGTH_SHORT).show();
                setResult(RESULT_OK, null);
                finish(); //不能少
            }
        });


        Button bt2= (Button)findViewById(R.id.button_cancel2);
        bt2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                finish();
            }
        });
//取消按钮


    }
}

avtivity_update.xml 代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="编号"
            android:textSize="24sp" />

        <EditText
            android:id="@+id/editText3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:inputType="textPersonName" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="姓名"
            android:textSize="24sp" />

        <EditText
            android:id="@+id/editText4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:inputType="textPersonName" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="年龄"
            android:textSize="24sp" />

        <EditText
            android:id="@+id/editText5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:inputType="textPersonName" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button_save"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="保存"
            android:textSize="24sp" />

        <Button
            android:id="@+id/button_cancel2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="取消"
            android:textSize="24sp" />

    </LinearLayout>
</LinearLayout>

listview.xml 代码:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/txtAge"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text=" age"
            android:textSize="20dp" />

        <TextView
            android:id="@+id/txtName"
            android:layout_width="100dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text=" name"
            android:textSize="20dp" />

        <TextView
            android:id="@+id/txtID"
            android:layout_width="100dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="id"
            android:textSize="20dp" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="horizontal">

        <ListView
            android:id="@+id/ListView1"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </LinearLayout>

</LinearLayout>

//ListView使用SimpleCursorAdapter适配器填充：(用于显示数据库数据)该适配器允许将一个Cursor(查询结果集)的数据列绑定到ListView自定义布局中的TextView 或 ImageView组件上

//此处补充ShowActivity中SimpleCursorAdapter用法,见下图

managa.xml 代码：

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/delete" android:title="删除"></item>
    <item android:id="@+id/update" android:title="修改"></item>
</menu>

//ListView添加ContextMenu (ShowActivity中用到) 方法： 在res下新建menu目录（2）在menu目录下新建一个manage.xml文件

运行截图：

                                                                        图一

                                                            图二

                                                           图三

                                                        图四

                                                               图五

用法： 打开app 主页面为图一，除了删除和修改按钮功能没实现（放在其他界面实现），其他都已实现，点击查询记录，回跳转到图二界面，点击图二界面的添加按钮既会调到图三的添加数据界面，用户可自行输入数据，点击保存就可以保存到数据库，并且刷新图二显示界面，将新添加的记录一并显示出来，长按图二中的每一行中的任意数据，会出现图四对数据操作的界面，点击操作功能即可进入相应界面进行删除或修改，图五为进行修改界面，点击保存即可保存到数据库，并刷新图二。

本人使用android 6.0 手机，功能都可以实现.