Android学习笔记二十四.Service入门(二)绑定本地Service并与之通信

package com.example.android_service_bind;
import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
public class BindService extends Service {
 private int count;
 private boolean quit;
 private MyIBinder binder=new MyIBinder();	//声明一个IBinder对象
 //1.定义一个IBinder子类并实现一个获取Service运行状态(count)的方法
 public class MyIBinder extends Binder
 {
  public int getCount()
  {
   return count;	 //返回Service运行状态:count
  }
 }
 //2.Service子类必须实现的一个类，用于返回IBinder对象
 public IBinder onBind(Intent intent) {
  System.out.println("Service is Binded!");
  return binder;	//返回IBinder对象
 }
 //3.Service被创建时回调该方法
 @Override
 public void onCreate() {
  super.onCreate();
  System.out.println("Service is Created.");
  //创建并启动一个线程，实现动态修改count状态值
  new Thread()
  {
   @Override
   public void run()
   {
    while(!quit)	//标识Service关闭启动状态
    {
     try
     {
      Thread.sleep(1000);
     }catch(InterruptedException e)
     {
     }
     count++;
    }
   }
  }.start();
 }
 //4.Service被断开连接时回调方法
 @Override
 public boolean onUnbind(Intent intent) {
  System.out.println("Service is Unbinded");
  return true;
 }
 //5.Service被关闭之前回调该方法
 @Override
 public void onDestroy() {
  super.onDestroy();
  this.quit=true;	 //当调用该方法后(!quit)为假，线程结束
  System.out.println("Service is Destroy");
 }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.android_service_bind"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".BindServiceTest"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
       <!-- 配置一个Service组件 -->
       <service android:name=".BindService">
        <intent-filter>
             <!-- 为该Service组件的intent-filter配置action -->
             <action android:name="com.example.service.BIND_SERVICE"/>
        </intent-filter>
       </service>
      </application>
</manifest>

package com.example.android_service_bind;
import android.app.Activity;
import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class BindServiceTest extends Activity {
 Button bind,unbind,status;
 //1.保持所启动的Service的IBinder对象
 BindService.MyIBinder binder;
 //2.定义一个ServiceConnection对象
 private ServiceConnection conn = new ServiceConnection()
 {
  //a.当该Activity与Service连接成功时回调该方法
  @Override
  public void onServiceConnected(ComponentName name
    , IBinder service)
  {
   System.out.println("---Service is connected---");
   //获取Service的onBind方法所返回的MyBinder对象
   binder=(BindService.MyIBinder)service;
  }
  //b.当该Activity与Service连接不成功时回调该方法
  @Override
  public void onServiceDisconnected(ComponentName name) {
   System.out.println("---Service is Disconnected---");
  }
 };
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  //a.获取程序界面中的start、stop、getServiceStatus按钮
  bind = (Button)findViewById(R.id.bind);
  unbind = (Button)findViewById(R.id.unbind);
  status = (Button)findViewById(R.id.getServiceStatus);
  //b.创建启动Service的Intent
  final Intent intent = new Intent();
  intent.setAction("com.example.service.BIND_SERVICE");
  //c.绑定指定Service
  bind.setOnClickListener(new OnClickListener(){
   @Override
   public void onClick(View v) {
    bindService(intent,conn,Service.BIND_AUTO_CREATE);
   }
  });
  //d.解除绑定的Service
  unbind.setOnClickListener(new OnClickListener(){
   @Override
   public void onClick(View v) {
    unbindService(conn);
   }
  });
  //e.获取Service的状态,显示Service的count值
  status.setOnClickListener(new OnClickListener(){
   @Override
   public void onClick(View v) {
    Toast.makeText(BindServiceTest.this,"Service的count值为:"+binder.getCount()
       , Toast.LENGTH_SHORT).show();
   }
  });
 }
 
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
 <LinearLayout
     android:orientation="horizontal"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
     <Button
         android:id="@+id/bind"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1"
         android:text="绑定service"/>
      <Button
         android:id="@+id/unbind"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1"
         android:text="解除绑定"/>
       <Button
         android:id="@+id/getServiceStatus"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1"
         android:text="获取状态"/>
    </LinearLayout>
</LinearLayout>