问题
I have developed Android app to detect the beacon if the customer is near to 1 mt distance . I am using Android Beacon Library to develop the application.When we are in foreground the I get the notification but as soon as the application goes into background .. notification stooped working . Could you help me where am I wrong ? Below is the code for BeaconApp and MainActivity.
BeaconApp.java
public class BeaconApp extends Application implements BootstrapNotifier {
private static final String TAG = "BeaconApp";
private RegionBootstrap regionBootstrap;
private Region allbeaconsregions;
private BackgroundPowerSaver bgSaver;
BeaconManager beaconManager;
@Override
public void onCreate() {
super.onCreate();
Log.d(TAG, "App started up");
// To detect proprietary beacons, you must add a line likebelowcorresponding to your beacon
// type. Do a web search for "setBeaconLayout" to get the proper expression.
// beaconManager.getBeaconParsers().add(new BeaconParser().
// setBeaconLayout("m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25"));
// wake up the app when any beacon is seen (you can specify specific id filers in the parameters below)
beaconManager = BeaconManager.getInstanceForApplication(this);
Beacon.setHardwareEqualityEnforced(true);
bgSaver = new BackgroundPowerSaver(this);
beaconManager.getBeaconParsers().add(new BeaconParser().
setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24"));
allbeaconsregions = new Region("treewalker", null, null, null);
regionBootstrap = new RegionBootstrap(this, allbeaconsregions);
//beaconManager.bind(this);
}
@Override
public void didDetermineStateForRegion(int arg0, Region arg1) {
// Don't care
Log.d(TAG, "Enter in didDetermineStateForRegion call");
}
@Override
public void didEnterRegion(Region arg0) {
Log.d(TAG, "Got a didEnterRegion call");
// This call to disable will make it so the activity below only gets launched the first time a beacon is seen (until the next time the app is launched)
// if you want the Activity to launch every single time beacons come into view, remove this call.
regionBootstrap.disable();
Intent intent = new Intent(this, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// Important: make sure to add android:launchMode="singleInstance" in the manifest
// to keep multiple copies of this activity from getting created if the user has
// already manually launched the app.
this.startActivity(intent);
}
@Override
public void didExitRegion(Region arg0) {
// Don't care
Log.d(TAG, "Enter in didExitRegion call");
}
}
In MainActivity.java
public class MainActivity extends AppCompatActivity implements BeaconConsumer,RangeNotifier {
protected static final String TAG = "MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mBeaconManager = BeaconManager.getInstanceForApplication(this);
Beacon.setHardwareEqualityEnforced(true);
BackgroundPowerSaver bgSaver = new BackgroundPowerSaver(this);
mBeaconManager.getBeaconParsers().add(new BeaconParser().
setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24"));
mBeaconManager.bind(this);
}
private BeaconManager mBeaconManager;
public void onResume() {
super.onResume();
mBeaconManager = BeaconManager.getInstanceForApplication(this.getApplicationContext());
// Detect the main Eddystone-UID frame:
mBeaconManager.getBeaconParsers().add(new BeaconParser().
setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24"));
mBeaconManager.bind(this);
}
public void onBeaconServiceConnect() {
try {
mBeaconManager.startRangingBeaconsInRegion(new Region("treewalker", null, null, null));
mBeaconManager.addRangeNotifier(this);
}catch (RemoteException e){
e.printStackTrace();
}
}
@Override
public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
if(beacons.size() > 0) {
for (Beacon beacon : beacons) {
if (beacon.getDistance() < 1.0) {
Log.d(TAG, "I see a beacon transmitting a : " +
" approximately " + beacon.getDistance() + " meters away.");
Log.d(TAG, "BEACON DATA : " +beacon.getBluetoothAddress()+":"+beacon.getBluetoothName()+":"+beacon.getId1());
showNotification("Treewalker","You are near beacon range");
Intent intent = new Intent(this,MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
this.startActivity(intent);
}
}
}
}
public void showNotification(String title, String message) {
Intent notifyIntent = new Intent(this, DashboardActivity.class);
notifyIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
PendingIntent pendingIntent = PendingIntent.getActivities(this, 0,
new Intent[] { notifyIntent }, PendingIntent.FLAG_UPDATE_CURRENT);
Notification notification = new Notification.Builder(this)
.setSmallIcon(android.R.drawable.ic_dialog_info)
.setContentTitle(title)
.setContentText(message)
.setAutoCancel(true)
.setContentIntent(pendingIntent)
.build();
notification.defaults |= Notification.DEFAULT_SOUND;
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(1, notification);
}
@Override
public void onPause() {
super.onPause();
//mBeaconManager.unbind(this);
}
}
回答1:
The problem is that when your app goes to the background, the MainActivity will call onPause, and the code inside that method calls the mBeaconManager.unbind(this); method, which effectively stops beacon ranging.
If you want ranging to continue in the background, the easiest thing to do is move the following two lines:
mBeaconManager.startRangingBeaconsInRegion(new Region("treewalker", null, null, null));
mBeaconManager.addRangeNotifier(this);
to the BeaconApp class' didDetermineStateForRegion method. You'll also need to move the didRangeBeaconsInRegion and showNotification methods there, too.
来源：https://stackoverflow.com/questions/44971138/android-ibeacon-app-not-working-in-the-background