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androidalertlocationmanagerproximity

Android: how to set a proximity alert to fire only when exiting or only when entering the location


I am developing a ToDo app with reminders(by time and by location) and the thing is I give the user the option to choose if he wants the reminder by location to alert when he is entering the location or when he exits the location. how can i do that??

I know about the KEY_PROXIMITY_ENTERING but I dont know how to use it Please help... thanx in advance


Solution

  • The KEY_PROXIMITY_ENTERING is usually used to determine whether the device is entering or exiting.

    You should first register to the LocationManager

    LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    Intent intent = new Intent(Constants.ACTION_PROXIMITY_ALERT);
    PendingIntent pendingIntent = PendingIntent.getService(this, 0, intent, 0);
    
    locationManager.addProximityAlert(location.getLatitude(),
        location.getLongitude(), location.getRadius(), -1, pendingIntent);
    

    The PendingIntent will be used to generate an Intent to fire when entry to or exit from the alert region is detected. You should define a broadcast receiver to receive the broadcast sent from LocationManager:

    public class YourReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
    
            final String key = LocationManager.KEY_PROXIMITY_ENTERING;
            final Boolean entering = intent.getBooleanExtra(key, false);
    
            if (entering) {
                Toast.makeText(context, "entering", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(context, "exiting", Toast.LENGTH_SHORT).show();
            }
        }
    }
    

    Then register the receiver in your manifest.

    <receiver android:name="yourpackage.YourReceiver " >
        <intent-filter>
            <action android:name="ACTION_PROXIMITY_ALERT" />
        </intent-filter>
    </receiver>