两个Service之间相互监视的实现在实际开发中可能需要用到两个Service相互监视的情况,本示例就是实现此功能以作参考。
服务A:public class ServiceA extends Service {private static final String TAG = ServiceA.class.getSimpleName();MyBinder mBinder;MyServiceConnection mServiceConnection;PendingIntent mPendingIntent;@Overridepublic void onCreate() {super.onCreate();if(mBinder==null){mBinder=new MyBinder();}mServiceConnection=new MyServiceConnection();}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {ServiceA.this.bindService(new Intent(ServiceA.this,ServiceB.class),mServiceConnection, Context.BIND_IMPORTANT);mPendingIntent=PendingIntent.getService(this,0,intent,0);Notification.Builder builder=new Notification.Builder(this);builder.setTicker("守护服务A启动中").setContentText("我是来守护服务B的").setContentTitle("守护服务A").setSmallIcon(R.mipmap.ic_launcher).setContentIntent(mPendingIntent).setWhen(System.currentTimeMillis());Notification notification=builder.build();startForeground(startId,notification);return START_STICKY;}@Overridepublic IBinder onBind(Intent intent) {return mBinder;}public class MyBinder extends IBridgeInterface.Stub {@Overridepublic String getName() throws RemoteException {return "name:"+TAG;}}class MyServiceConnection implements ServiceConnection {@Overridepublic void onServiceConnected(ComponentName componentName, IBinder iBinder) {String name=null;try {name= IBridgeInterface.Stub.asInterface(iBinder).getName();} catch (RemoteException e) {e.printStackTrace();}Toast.makeText(ServiceA.this,name+"连接成功",Toast.LENGTH_SHORT).show();}@Overridepublic void onServiceDisconnected(ComponentName componentName) {Toast.makeText(ServiceA.this,TAG+"断开连接",Toast.LENGTH_SHORT).show();ServiceA.this.startService(new Intent(ServiceA.this,ServiceB.class));ServiceA.this.bindService(new Intent(ServiceA.this,ServiceB.class),mServiceConnection, Context.BIND_IMPORTANT);}}}
服务B:public class ServiceB extends Service {private static final String TAG = ServiceB.class.getSimpleName();private PendingIntent mPendingIntent;private MyBinder mBinder;private MyServiceConnection mServiceConnection;@Overridepublic IBinder onBind(Intent intent) {return mBinder;}@Overridepublic void onCreate() {super.onCreate();if (mBinder == null) {mBinder = new MyBinder();}mServiceConnection = new MyServiceConnection();}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {this.bindService(new Intent(ServiceB.this, ServiceA.class), mServiceConnection, Context.BIND_IMPORTANT);mPendingIntent = PendingIntent.getService(this, 0, intent, 0);Notification.Builder builder = new Notification.Builder(this);builder.setTicker("守护服务B启动中").setContentText("我是来守护服务A的").setContentTitle("守护服务B").setSmallIcon(R.mipmap.ic_launcher).setContentIntent(mPendingIntent).setWhen(System.currentTimeMillis());Notification notification = builder.build();startForeground(startId, notification);return START_STICKY;}public class MyBinder extends IBridgeInterface.Stub {@Overridepublic String getName() throws RemoteException {return "name:"+TAG;}}class MyServiceConnection implements ServiceConnection {@Overridepublic void onServiceConnected(ComponentName componentName, IBinder iBinder) {String name=null;try {name=IBridgeInterface.Stub.asInterface(iBinder).getName();} catch (RemoteException e) {e.printStackTrace();}Toast.makeText(ServiceB.this, name + "连接成功", Toast.LENGTH_SHORT).show();}@Overridepublic void onServiceDisconnected(ComponentName componentName) {Toast.makeText(ServiceB.this, TAG + "断开连接", Toast.LENGTH_SHORT).show();ServiceB.this.startService(new Intent(ServiceB.this, ServiceA.class));ServiceB.this.bindService(new Intent(ServiceB.this, ServiceA.class), mServiceConnection, Context.BIND_IMPORTANT);}}}
IBridgeInterface.aidl1 interface IBridgeInterface {2 String getName();3 }
界面:public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);startService(new Intent(this, ServiceA.class));startService(new Intent(this, ServiceB.class));}}
AndroidManifest.xml<service android:name=".services.ServiceA" /><serviceandroid:name=".services.ServiceB" android:process=":remote" />
由于涉及到跨进程,onServiceConnected() 方法中使用
IBridgeInterface.Stub.asInterface(iBinder).getName();
而不能直接类型转换
((ServiceA.MyBinder)iBinder).getName();
onStartCommandonStartCommand() 方法必须返回整型数。整型数是一个值,用于描述系统应该如何在服务终止的情况下继续运行服务。
返回的值必须是以下常量之一:
START_NOT_STICKY 如果系统在 onStartCommand() 返回后终止服务,则除非有挂起 Intent 要传递,否则系统不会重建服务。
START_STICKY 如果系统在 onStartCommand() 返回后终止服务,则会重建服务并调用 onStartCommand(),但绝对不会重新传递最后一个 Intent。相反,除非有挂起 Intent 要启动服务(在这种情况下,将传递这些 Intent ),否则系统会通过空 Intent 调用 onStartCommand()。这适用于不执行命令、但无限期运行并等待作业的媒体播放器(或类似服务)。
START_REDELIVER_INTENT 如果系统在 onStartCommand() 返回后终止服务,则会重建服务,并通过传递给服务的最后一个 Intent 调用 onStartCommand()。任何挂起 Intent 均依次传递。这适用于主动执行应该立即恢复的作业(例如下载文件)的服务。
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