Android - Unable to receive local broadcast in my activity from service

问题:

I have my main activity that start a service (Location service) and I want that service to broadcast the new location each time a new location is found.

Thanks to the log I know the service is working and I have new locations every seconds or so, but I never get the broadcast.

MainActivity.java

public class MainActivity extends Activity {   private static final String TAG = "mainActivity";  private CMBroadcastReceiver mMessageReceiver = new CMBroadcastReceiver();  /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) {      // Start Service     startService(new Intent(this, LocationService.class));      super.onCreate(savedInstanceState); }  @Override public void onResume() {     LocalBroadcastManager.getInstance(this).registerReceiver(             mMessageReceiver, new IntentFilter(CMBroadcastReceiver.RECEIVE_LOCATION_UPDATE));     super.onResume(); }  @Override public void onPause() {     LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);     super.onPause(); } } 

CMBroadcastReceiver.java

public class CMBroadcastReceiver extends BroadcastReceiver {  private static final String TAG = "CMBroadcastReceiver";  public static final String RECEIVE_LOCATION_UPDATE = "LOCATION_UPDATES";  @Override public void onReceive(Context context, Intent intent) {     Log.i(TAG, "Received broadcast");     String action = intent.getAction();     if (action.equals(RECEIVE_LOCATION_UPDATE))     {         Log.i(TAG, "Received location update from service!");     } } } 

LocationService.java

/**  * Callback that fires when the location changes.  */ @Override public void onLocationChanged(Location location) {     mCurrentLocation = location;     mLastUpdateTime = DateFormat.getTimeInstance().format(new Date());     Log.i(TAG, "onLocationChanged " + location);      Intent intent = new Intent(CMBroadcastReceiver.RECEIVE_LOCATION_UPDATE);     LocalBroadcastManager.getInstance(this).sendBroadcast(intent);     Log.i(TAG, "Broadcast sent"); } 

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.cyclemapapp.gpstracker">  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> <application     android:allowBackup="true"     android:icon="@mipmap/ic_launcher"     android:label="@string/app_name"     android:supportsRtl="true"     android:theme="@style/AppTheme">     <activity         android:name=".MainActivity"         android:label="@string/title_activity_main"         android:theme="@style/AppTheme.NoActionBar">         android:configChanges="orientation|screenSize">         <intent-filter>             <action android:name="android.intent.action.MAIN" />              <category android:name="android.intent.category.LAUNCHER" />         </intent-filter>     </activity>     <service android:name=".LocationService" android:process=":location_service" /> </application> 

I the log I can see that "Broadcast Sent" But I never get the "Broadcast Received"

Any help will would be greatly appreciated.

EDIT:

Edited how the intent was created in the location service as Shaishav suggested.

Still doesn't work.

回答1:

LocalBroadcastManager does not work across processes. Your Service is running in a separate process.

You can either run your Service in the same process as the Activity - by removing the process attribute from the <service> element - or use some sort of IPC instead - e.g., by sending and receiving the broadcasts on a Context instead of LocalBroadcastManager.

回答2:

In your LocationService, send local broadcast using:

Intent intent = new Intent(CMBroadcastReceiver.RECEIVE_LOCATION_UPDATE); LocalBroadcastManager.getInstance(this).sendBroadcast(intent); 

回答3:

<service android:name=".LocationService" android:process=":location_service" /> 

Your service is in a separate process from the activity. LocalBroadcastManager is only for use in one process. Either remove android:process from the <service>, or use some IPC mechanism (e.g., system broadcasts, properly secured).

文章来源: Android - Unable to receive local broadcast in my activity from service