Can't start activity from BroadcastReceiver on android 10

Question

I updated my OS version to android 10 last night, and since then the startActivity function inside the broadcast receiver is doing nothing. This is how I try to start the ac

Answer 1

Android 10's restriction on background activity starts was announced about six months ago. You can read more about it in the documentation.

So you need to have a high-level notification and when the user clicks on the notification your activity will be opened notifications

public class UIExampleReceiver extends BroadcastReceiver {

public static final String TAG_NOTIFICATION = "NOTIFICATION_MESSAGE";
public static final String CHANNEL_ID = "channel_1111";
public static final int NOTIFICATION_ID = 111111;
private static final String TAG = "Receiver";

@Override
public void onReceive(Context context, Intent intent) {

    try {

            // If android 10 or higher
            if (Build.VERSION.SDK_INT > Build.VERSION_CODES.P)
            {

                 startActivityNotification(context,NOTIFICATION_ID,context.getResources().getString(R.string.open_app), context.getResources().getString(R.string.click_app));

            }
            else
            {
                // If lower than Android 10, we use the normal method ever.
                Intent activity = new Intent(context, ExampleActivity.class);
                activity.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(activity);
            }

    } catch (Exception e)
    {
        Log.d(TAG,e.getMessage()+"");
    }
}


 // notification method to support opening activities on Android 10
public static void startActivityNotification(Context context, int notificationID, 
String title, String message) {

    NotificationManager mNotificationManager =
            (NotificationManager) 
   context.getSystemService(Context.NOTIFICATION_SERVICE);
    //Create GPSNotification builder
    NotificationCompat.Builder mBuilder;

    //Initialise ContentIntent
    Intent ContentIntent = new Intent(context, ExampleActivity.class);
    ContentIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | 
    Intent.FLAG_ACTIVITY_CLEAR_TASK);
    PendingIntent ContentPendingIntent = PendingIntent.getActivity(context,
            0,
            ContentIntent,
            PendingIntent.FLAG_UPDATE_CURRENT);

    mBuilder = new NotificationCompat.Builder(context)
            .setSmallIcon(R.drawable.ic_launcher)
            .setContentTitle(title)
            .setContentText(message)
            .setColor(context.getResources().getColor(R.color.colorPrimaryDark))
            .setAutoCancel(true)
            .setContentIntent(ContentPendingIntent)
            .setDefaults(Notification.DEFAULT_LIGHTS | Notification.DEFAULT_VIBRATE)
            .setCategory(NotificationCompat.CATEGORY_MESSAGE)
            .setPriority(NotificationCompat.PRIORITY_DEFAULT);

    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
        NotificationChannel mChannel = new NotificationChannel(CHANNEL_ID,
                "Activity Opening Notification",
                NotificationManager.IMPORTANCE_HIGH);
        mChannel.enableLights(true);
        mChannel.enableVibration(true);
        mChannel.setDescription("Activity opening notification");

        mBuilder.setChannelId(CHANNEL_ID);

   Objects.requireNonNull(mNotificationManager).createNotificationChannel(mChannel);
    }

 Objects.requireNonNull(mNotificationManager).notify(TAG_NOTIFICATION,notificationID, 
 mBuilder.build());
    }

}