绑定Service并与之通信

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这个例程有三个按钮bindButton、unbindButton、getServiceStatusButton

分别是绑定Service、解除绑定、获取Service状态

BindServiceTest.java 在Activity中绑定本地Service，并获取Service的运行状态

public class BindServiceTest extends Activity {Button bindButton,unbindButton,getServiceStatusButton;// 保持所启动的Service的IBinder对象BindService.MyBinder binder;// 定义一个ServiceConnection对象private ServiceConnection conn = new ServiceConnection(){@Override// 当该Activity与Service连接成功时回调该方法public void onServiceConnected(ComponentName name, IBinder service) {System.out.println("--Service Connected--");binder = (BindService.MyBinder) service;}// 当该Activity与Service断开连接时回调该方法@Overridepublic void onServiceDisconnected(ComponentName name) {System.out.println("--Service Disconnected--");}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);bindButton = (Button)findViewById(R.id.bind);unbindButton = (Button)findViewById(R.id.unbind);getServiceStatusButton = (Button)findViewById(R.id.getServiceStatus);final Intent intent = new Intent();intent.setAction("crazyit.service.BIND_SERVICE");bindButton.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {bindService(intent, conn, Service.BIND_AUTO_CREATE);}});unbindButton.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {unbindService(conn);}});getServiceStatusButton.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Toast.makeText(BindServiceTest.this,"Service的count值为"+ binder.getCount(), Toast.LENGTH_SHORT).show();}});}}

BindService.java 继承Service的子类，实现onBind（）方法，并让该方法返回一个可访问该Service状态数据的IBinder对象，该对象将被传给该Service的访问者

public class BindService extends Service {private int count;private boolean quit;// 定义onBinder方法所返回的对象private MyBinder binder = new MyBinder();// 通过继承Binder来实现IBinder类public class MyBinder extends Binder{public int getCount(){// 获取Service的运行状态：countreturn count;}}// 必须实现的方法，绑定该Service时回调该方法@Overridepublic IBinder onBind(Intent intent) {System.out.println("Service is Binded");// 返回IBinder对象return binder;}// Service被创建时回调该方法。@Overridepublic void onCreate() {// TODO Auto-generated method stubsuper.onCreate();System.out.println("Service is Created");new Thread(){@Overridepublic void run() {while(!quit){try{Thread.sleep(1000);}catch(InterruptedException e){e.printStackTrace();}count++;}}}.start();}// Service被断开连接时回调该方法@Overridepublic boolean onUnbind(Intent intent) {System.out.println("Service is onUnbinded");return true;}@Overridepublic void onDestroy() {super.onDestroy();this.quit = true;System.out.println("Service is Destroyed");}}

manifest文件

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="crazyit.bindservice"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="18" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="crazyit.bindservice.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="crazyit.service.BIND_SERVICE" /></intent-filter></service>    </application></manifest>

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