兩個Service之間相互監(jiān)視的實現
在實際開發(fā)中可能需要用到兩個Service相互監(jiān)視的情況，本示例就是實現此功能以作參考。
服務A：
public class ServiceA extends Service { private static final String TAG = ServiceA.class.getSimpleName(); MyBinder mBinder; MyServiceConnection mServiceConnection; PendingIntent mPendingIntent; @Override public void onCreate() { super.onCreate(); if(mBinder==null) { mBinder=new MyBinder(); } mServiceConnection=new MyServiceConnection(); } @Override public 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("守護服務A啟動中") .setContentText("我是來守護服務B的") .setContentTitle("守護服務A") .setSmallIcon(R.mipmap.ic_launcher) .setContentIntent(mPendingIntent) .setWhen(System.currentTimeMillis()); Notification notification=builder.build(); startForeground(startId,notification); return START_STICKY; } @Override public IBinder onBind(Intent intent) { return mBinder; } public class MyBinder extends IBridgeInterface.Stub { @Override public String getName() throws RemoteException { return "name:"+TAG; } } class MyServiceConnection implements ServiceConnection { @Override public 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+"連接成功",Toast.LENGTH_SHORT).show(); } @Override public void onServiceDisconnected(ComponentName componentName) { Toast.makeText(ServiceA.this,TAG+"斷開連接",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); } }}服務B：
public class ServiceB extends Service { private static final String TAG = ServiceB.class.getSimpleName(); private PendingIntent mPendingIntent; private MyBinder mBinder; private MyServiceConnection mServiceConnection; @Override public IBinder onBind(Intent intent) { return mBinder; } @Override public void onCreate() { super.onCreate(); if (mBinder == null) { mBinder = new MyBinder(); } mServiceConnection = new MyServiceConnection(); } @Override public 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("守護服務B啟動中") .setContentText("我是來守護服務A的") .setContentTitle("守護服務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 { @Override public String getName() throws RemoteException { return "name:"+TAG; } } class MyServiceConnection implements ServiceConnection { @Override public 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 + "連接成功", Toast.LENGTH_SHORT).show(); } @Override public void onServiceDisconnected(ComponentName componentName) { Toast.makeText(ServiceB.this, TAG + "斷開連接", 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.aidl
1 interface IBridgeInterface {2 String getName();3 }界面：
public class MainActivity extends Activity { @Override protected 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" /> <service android:name=".services.ServiceB" android:process=":remote" />
由于涉及到跨進程，onServiceConnected() 方法中使用
IBridgeInterface.Stub.asInterface(iBinder).getName();
而不能直接類型轉換
((ServiceA.MyBinder)iBinder).getName();
onStartCommand
onStartCommand() 方法必須返回整型數。整型數是一個值，用于描述系統應該如何在服務終止的情況下繼續(xù)運行服務。
返回的值必須是以下常量之一：
START_NOT_STICKY
如果系統在 onStartCommand() 返回后終止服務，則除非有掛起 Intent 要傳遞，否則系統不會重建服務。
START_STICKY
如果系統在 onStartCommand() 返回后終止服務，則會重建服務并調用 onStartCommand()，但絕對不會重新傳遞最后一個 Intent。相反，除非有掛起 Intent 要啟動服務（在這種情況下，將傳遞這些 Intent ），否則系統會通過空 Intent 調用 onStartCommand()。這適用于不執(zhí)行命令、但無限期運行并等待作業(yè)的媒體播放器（或類似服務）。
START_REDELIVER_INTENT
如果系統在 onStartCommand() 返回后終止服務，則會重建服務，并通過傳遞給服務的最后一個 Intent 調用 onStartCommand()。任何掛起 Intent 均依次傳遞。這適用于主動執(zhí)行應該立即恢復的作業(yè)（例如下載文件）的服務。
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