09

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.phonedata.MainActivity" >

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:text="通讯录"
        android:textSize="40dp" />

    <EditText
        android:id="@+id/et2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/textView3"
        android:layout_alignBottom="@+id/textView3"
        android:layout_alignRight="@+id/button2"
        android:layout_toRightOf="@+id/textView3"
        android:ems="10" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/textView3"
        android:layout_below="@+id/et2"
        android:layout_marginTop="25dp"
        android:text="添加" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button1"
        android:layout_below="@+id/button2"
        android:text="修改" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/button1"
        android:layout_alignBottom="@+id/button1"
        android:layout_alignRight="@+id/et1"
        android:layout_marginRight="16dp"
        android:text="查询" />

    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/tv4"
        android:layout_alignLeft="@+id/button2"
        android:text="删除" />

    <TextView
        android:id="@+id/tv4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button3"
        android:layout_below="@+id/button3"
        android:layout_marginTop="18dp" />

    <EditText
        android:id="@+id/et1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/textView1"
        android:layout_alignBottom="@+id/textView1"
        android:layout_marginLeft="16dp"
        android:layout_toRightOf="@+id/textView1"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView3"
        android:layout_below="@+id/textView2"
        android:text="姓名:"
        android:textSize="20dp" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/et1"
        android:text="电话号码:"
        android:textSize="20dp" />

</RelativeLayout>

package com.example.phonedata;

import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity implements OnClickListener {
    private EditText pname;
    private EditText pphone;
    private Button insert;
    private Button query;
    private Button update;
    private Button delete;
    private TextView tv;
    MyHelper myhelper;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myhelper = new MyHelper(this);
        init();
    }

    private void init() {
        // TODO Auto-generated method stub
        pname = (EditText) findViewById(R.id.et1);
        pphone = (EditText) findViewById(R.id.et2);
        insert = (Button) findViewById(R.id.button1);
        query = (Button) findViewById(R.id.button2);
        update = (Button) findViewById(R.id.button3);
        delete = (Button) findViewById(R.id.button4);
        tv=(TextView) findViewById(R.id.tv4);
        insert.setOnClickListener(this);
        query.setOnClickListener(this);
        update.setOnClickListener(this);
        delete.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        String name, phone;
        SQLiteDatabase db;
        ContentValues values;
        switch (v.getId()) {
        case R.id.button1:
            name = pname.getText().toString();
            phone = pphone.getText().toString();
            db = myhelper.getWritableDatabase();
            values = new ContentValues();
            values.put("name", name);
            values.put("phone", phone);
            db.insert("information", null, values);
            Toast.makeText(this, "信息已添加成功", Toast.LENGTH_SHORT).show();
            db.close();
            break;
        case R.id.button2:
            db = myhelper.getReadableDatabase();
            Cursor cursor = db.query("information", null, null, null, null, null, null);
            if (cursor.getCount() == 0) {
                tv.setText("");
                Toast.makeText(this, "沒有数据", Toast.LENGTH_SHORT).show();
            } else {
                cursor.moveToFirst();
                tv.setText("姓名:" + cursor.getString(1) + ";" + "电话号码:" + cursor.getString(2) + ";");

            }
            while (cursor.moveToNext()) {
                tv.append("\n" + "姓名:" + cursor.getString(1) + ";" + "电话号码:" + cursor.getString(2) + ";");
            }
            cursor.close();
            db.close();
            break;
        case R.id.button3:
            db = myhelper.getWritableDatabase();
            values = new ContentValues();
            values.put("phone", phone=pphone.getText().toString());
            db.update("information", values, "name=?", new String[] {pname.getText().toString()});
            Toast.makeText(this, "信息已修改成功", Toast.LENGTH_SHORT).show();
            db.close();
            break;
        case R.id.button4:
            name = pname.getText().toString();
            db=myhelper.getReadableDatabase();    
            
            db.delete("information", "name=?", new String[] {name});
            Toast.makeText(this, "信息已刪除成功", Toast.LENGTH_SHORT).show();
            
            db.close();
            break;
            
        }

    }

}

package com.example.phonedata;

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

public class MyHelper  extends SQLiteOpenHelper{

    public MyHelper(Context context) {
        super(context, "itcast.db", null, 1);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL("create table information (_id integer primary key autoincrement,name varchar(10),phone varchar(20))");
        
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        
    }
   
}