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; @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; } @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+"连接成功",Toast.LENGTH_SHORT).show(); } @Override public 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; @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 { @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 + "连接成功", Toast.LENGTH_SHORT).show(); } @Override public 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.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();
onStartCommand
onStartCommand() 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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