兩個Service之間相互監視的實現，兩個service監視

兩個Service之間相互監視的實現，兩個service監視

 

在實際開發中可能需要用到兩個Service相互監視的情況，本樣本就是實現此功能以作參考。

服務A：

 1 public class ServiceA extends Service { 2  3  4     private static final String TAG = ServiceA.class.getSimpleName(); 5     MyBinder mBinder; 6     MyServiceConnection mServiceConnection; 7     PendingIntent mPendingIntent; 8  9     @Override10     public void onCreate() {11         super.onCreate();12 13         if(mBinder==null)14         {15             mBinder=new MyBinder();16         }17         mServiceConnection=new MyServiceConnection();18     }19 20     @Override21     public int onStartCommand(Intent intent, int flags, int startId) {22         ServiceA.this.bindService(new Intent(ServiceA.this,ServiceB.class),mServiceConnection, Context.BIND_IMPORTANT);23         mPendingIntent=PendingIntent.getService(this,0,intent,0);24         Notification.Builder builder=new Notification.Builder(this);25         builder.setTicker("守護服務A啟動中")26                 .setContentText("我是來守護服務B的")27                 .setContentTitle("守護服務A")28                 .setSmallIcon(R.mipmap.ic_launcher)29                 .setContentIntent(mPendingIntent)30                 .setWhen(System.currentTimeMillis());31         Notification notification=builder.build();32 33         startForeground(startId,notification);34 35 36         return START_STICKY;37     }38 39     @Override40     public IBinder onBind(Intent intent) {41         return mBinder;42     }43 44     public class MyBinder extends IBridgeInterface.Stub {45 46         @Override47         public String getName() throws RemoteException {48             return "name:"+TAG;49         }50     }51 52     class MyServiceConnection implements ServiceConnection {53 54         @Override55         public void onServiceConnected(ComponentName componentName, IBinder iBinder) {56             String name=null;57             try {58                 name= IBridgeInterface.Stub.asInterface(iBinder).getName();59             } catch (RemoteException e) {60                 e.printStackTrace();61             }62 63 64             Toast.makeText(ServiceA.this,name+"串連成功",Toast.LENGTH_SHORT).show();65         }66 67         @Override68         public void onServiceDisconnected(ComponentName componentName) {69             Toast.makeText(ServiceA.this,TAG+"中斷連線",Toast.LENGTH_SHORT).show();70 71             ServiceA.this.startService(new Intent(ServiceA.this,ServiceB.class));72 73             ServiceA.this.bindService(new Intent(ServiceA.this,ServiceB.class),mServiceConnection, Context.BIND_IMPORTANT);74 75         }76     }77 78 79 }

服務B：

 1 public class ServiceB extends Service { 2  3     private static final String TAG = ServiceB.class.getSimpleName(); 4     private PendingIntent mPendingIntent; 5     private MyBinder mBinder; 6     private MyServiceConnection mServiceConnection; 7  8     @Override 9     public IBinder onBind(Intent intent) {10         return mBinder;11     }12 13     @Override14     public void onCreate() {15         super.onCreate();16         if (mBinder == null) {17             mBinder = new MyBinder();18         }19 20         mServiceConnection = new MyServiceConnection();21     }22 23     @Override24     public int onStartCommand(Intent intent, int flags, int startId) {25         this.bindService(new Intent(ServiceB.this, ServiceA.class), mServiceConnection, Context.BIND_IMPORTANT);26         mPendingIntent = PendingIntent.getService(this, 0, intent, 0);27         Notification.Builder builder = new Notification.Builder(this);28 29         builder.setTicker("守護服務B啟動中")30                 .setContentText("我是來守護服務A的")31                 .setContentTitle("守護服務B")32                 .setSmallIcon(R.mipmap.ic_launcher)33                 .setContentIntent(mPendingIntent)34                 .setWhen(System.currentTimeMillis());35         Notification notification = builder.build();36         startForeground(startId, notification);37 38         return START_STICKY;39     }40 41     public class MyBinder extends IBridgeInterface.Stub {42 43         @Override44         public String getName() throws RemoteException {45             return "name:"+TAG;46         }47     }48 49     class MyServiceConnection implements ServiceConnection {50 51         @Override52         public void onServiceConnected(ComponentName componentName, IBinder iBinder) {53             String name=null;54             try {55                 name=IBridgeInterface.Stub.asInterface(iBinder).getName();56             } catch (RemoteException e) {57                 e.printStackTrace();58             }59             Toast.makeText(ServiceB.this, name + "串連成功", Toast.LENGTH_SHORT).show();60         }61 62         @Override63         public void onServiceDisconnected(ComponentName componentName) {64             Toast.makeText(ServiceB.this, TAG + "中斷連線", Toast.LENGTH_SHORT).show();65 66             ServiceB.this.startService(new Intent(ServiceB.this, ServiceA.class));67             ServiceB.this.bindService(new Intent(ServiceB.this, ServiceA.class), mServiceConnection, Context.BIND_IMPORTANT);68         }69     }70 71 72 }

IBridgeInterface.aidl

1 interface IBridgeInterface {2     String getName();3 }

介面：

 1 public class MainActivity extends Activity { 2  3  4     @Override 5     protected void onCreate(Bundle savedInstanceState) { 6         super.onCreate(savedInstanceState); 7         setContentView(R.layout.activity_main); 8  9         startService(new Intent(this, ServiceA.class));10         startService(new Intent(this, ServiceB.class));11     }12 13 }

AndroidManifest.xml

1         <service android:name=".services.ServiceA" />2         <service3             android:name=".services.ServiceB"4             android:process=":remote" />

 

由於涉及到跨進程，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，用於描述系統應該如何在服務終止的情況下繼續運行服務。

返回的值必須是以下常量之一：

START_NOT_STICKY

　　如果系統在 onStartCommand() 返回後終止服務，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() 返回後終止服務，則會重建服務並調用 onStartCommand()，但絕對不會重新傳遞最後一個 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()。這適用於不執行命令、但無限期運行並等待作業的媒體播放器（或類似服務）。

START_REDELIVER_INTENT

　　如果系統在 onStartCommand() 返回後終止服務，則會重建服務，並通過傳遞給服務的最後一個 Intent 調用 onStartCommand()。任何掛起 Intent 均依次傳遞。這適用於主動執行應該立即恢複的作業（例如下載檔案）的服務。