Suppress notifications from a service if activity is running

问题:

I have an Activity and Service that work together in my application. I've configured the service as a remote service (implemented AIDL) so it will keep running even when the Activity isn't visible.

The service is responsible for polling a server for data and sending alert notifications when certain criteria are met. I do not want the Service to send these notifications when the Activity is visible.

Is there a way for the Service to know the status of any particular activity? Particularly an activity that is bound to it?

updated with manifest to troubleshoot permission problem:

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"       package="com.interact.listen.android.voicemail"       android:versionCode="1"       android:versionName="1.0">     <application android:icon="@drawable/icon" android:label="@string/app_name">         <activity android:name=".MyAppName"                   android:label="@string/app_name">             <intent-filter>                 <action android:name="android.intent.action.MAIN" />                 <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>         <activity android:name=".MyObjectDetails"/>         <service android:enabled="true" android:name=".MyService" />         <receiver android:name=".MyReceiver">             <intent-filter>                 <action android:name="com.foo.bar.EVENT"/>             </intent-filter>         </receiver>     </application>     <uses-permission android:name="android.permission.INTERNET"></uses-permission> </manifest> 

The error I'm getting in Logcat:

09-17 15:33:17.881: WARN/ActivityManager(53): Permission Denial: receiving Intent { act=com.foo.bar.myobject.EVENT (has extras) } to ProcessRecord{43928b40 223:com.foo.bar.myobject/10022} (pid=223, uid=10022) requires com.foo.bar.myobject.EVENT due to sender com.foo.bar.myobject (uid 10022) 09-17 15:33:48.901: WARN/ActivityManager(53): Permission Denial: receiving Intent { act=com.foo.bar.myobject.EVENT (has extras) } to com.foo.bar.myobject requires com.foo.bar.myobject.EVENT due to sender com.foo.bar.myobject (uid 10022) 

Task that sends the broadcast:

@Override public void onStart(Intent intent, int startId) {     super.onStart(intent, startId);     serviceHandler = new Handler();     serviceHandler.postDelayed(myTask, 100L);     Log.d(TAG, "onStart()"); }  class Task implements Runnable {     public void run()     {         Log.i(TAG, "Getting myObjects...");         getMyObjects();         Bundle bundle = new Bundle();         bundle.putLongArray("ids", getIdsToUpdate());          Intent i = new Intent();         i.setAction(UPDATE_ACTION_STRING);         i.putExtras(bundle);          sendOrderedBroadcast(i, UPDATE_ACTION_STRING);          serviceHandler.postDelayed(this, 30000L);         }     } } 

回答1:

Is there a way for the Service to know the status of any particular activity? Particularly an activity that is bound to it?

You can implement some sort of callback system.

But there's a cleaner way to solve the problem. Use an ordered broadcast. Have the activity have a high-priority receiver; have the raise-a-notification logic be in a low-priority receiver. Have the activity's receiver call abortBroadcast() to prevent the notification. I have a blog post up about the technique. Use an event bus: greenrobot's EventBus, LocalBroadcastManager, an Rx-based event bus, or even a MutableLiveData. Have the service post a message to the bus. Have the UI layer register for events on the bus when the UI is in the foreground. Have the service raise a Notification if nobody picks up the event placed onto the bus.

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