BindService的生命周期以及使用方法。

bindService()：允许其他组件跟它进行通信，允许多个客户端绑定到同一个service上，当所有的客户端都解除绑定后，该service就销毁了。

1、main.xml包括bindservice和unbindservice2个按钮，还有模拟的四个按钮 

<?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" >        <Button        android:id="@+id/bind"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="BindService" />    <Button        android:id="@+id/play"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="播放" />    <Button        android:id="@+id/pause"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="暂停" />    <Button        android:id="@+id/next"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="下一首" />    <Button        android:id="@+id/pervious"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="上一首" />    <Button        android:id="@+id/unbind"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="UnBindService" /></LinearLayout>

2、AndroidMainfest.xml声明Service 

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.huangyi.bindservicedemo"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="17"        android:targetSdkVersion="17" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <service android:name="com.huangyi.bindservicedemo.BindService"/>    </application></manifest>

3、BindService.java里面定义了bindService生命周期的几个方法onCreate----->onBind--->onUnbind---->onDestroy，还自定义了一个类MyBinder集成Binder这个类，并在这个类里面写一个方法返回BindService类的对象。当然还有模拟播放的几个方法。

package com.huangyi.bindservicedemo;import android.app.Service;import android.content.Intent;import android.os.Binder;import android.os.IBinder;import android.util.Log;public class BindService extends Service {@Overridepublic void onCreate() {Log.i("info", "BindService--->onCreate()");super.onCreate();}@Overridepublic IBinder onBind(Intent intent) {Log.i("info", "BindService--->onBind()");return new MyBinder();}@Overridepublic boolean onUnbind(Intent intent) {Log.i("info", "BindService--->onUnbind()");return super.onUnbind(intent);}@Overridepublic void onDestroy() {Log.i("info", "BindService--->onDestroy()");super.onDestroy();}public class MyBinder extends Binder{public BindService getService(){return BindService.this;}}public void play(){Log.i("info", "播放");}public void pause(){Log.i("info", "暂停");}public void next(){Log.i("info", "下一首");}public void pervious(){Log.i("info", "上一首");}}

4、MainActivity.java

其中定义了ServiceConnection接口的实现对象conn，将传递过来的binder对象转化为BindService的对象。

package com.huangyi.bindservicedemo;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;public class MainActivity extends Activity implements OnClickListener{private Button bind,play,pause,next,pervious,unbind;private Intent intent;BindService service;ServiceConnection conn = new ServiceConnection() {/** * 当启动源跟Service的连接意外丢失的时候会调用这个方法 * ，比如Service崩溃了或者被强行杀死了 */@Overridepublic void onServiceDisconnected(ComponentName name) {}/** * 当启动源跟Service成功连接之后将会调用这个方法 */@Overridepublic void onServiceConnected(ComponentName name, IBinder binder) {service = ((BindService.MyBinder)binder).getService();}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);bind = (Button) findViewById(R.id.bind);play = (Button) findViewById(R.id.play);pause = (Button) findViewById(R.id.pause);next = (Button) findViewById(R.id.next);pervious = (Button) findViewById(R.id.pervious);unbind = (Button) findViewById(R.id.unbind);bind.setOnClickListener(this);play.setOnClickListener(this);pause.setOnClickListener(this);next.setOnClickListener(this);pervious.setOnClickListener(this);unbind.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.bind:intent = new Intent(MainActivity.this, BindService.class);bindService(intent, conn, Service.BIND_AUTO_CREATE);break;case R.id.play:service.play();break;case R.id.pause:service.pause();break;case R.id.next:service.next();break;case R.id.pervious:service.pervious();break;case R.id.unbind:unbindService(conn);break;}}}

运行结果：

依次从上到下点击按钮

代码地址：http://download.csdn.net/detail/yihuangol/9259295