Full screen intent not starting the activity but do show a notification on android 10

Question

I try to launch activity for a broadcastReceiver by using the next code

 Intent i = new Intent(context, AlarmNotification.class);
 i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) { // This is at least android 10...

                NotificationManager mgr = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

                if (mgr.getNotificationChannel(CHANNEL_WHATEVER)==null) {
                    mgr.createNotificationChannel(new NotificationChannel(CHANNEL_WHATEVER,
                            "Whatever", NotificationManager.IMPORTANCE_HIGH));
                }

                mgr.notify(NOTIFY_ID, buildNormal(context, i).build());

            }

private NotificationCompat.Builder buildNormal(Context context, Intent intent) {

    NotificationCompat.Builder b=
            new NotificationCompat.Builder(context, CHANNEL_WHATEVER);

    b.setAutoCancel(true)
            .setDefaults(Notification.DEFAULT_ALL)
            .setSmallIcon(android.R.drawable.ic_lock_idle_alarm)
            .setStyle(new NotificationCompat.BigTextStyle()
                    .bigText(TEXT)
            .setContentText(TEXT)
            .setFullScreenIntent(buildPendingIntent(context, intent), true);

    return(b);

}

private PendingIntent buildPendingIntent(Context context, Intent intent) {

    return(PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT));
}

In the beginning, everything work's perfectly fine. But if I enter the app settings, turn off the notification channel of CHANNEL_WHATEVER, and then turn it on again. Later when I call NotificationManager.notify it shows the notification in the notification drawer but does not start the activity. If I delete the app and reinstall, it works fine again. Is that a bug of android 10 which I should report on, or there is something I can do about it?

Answer 1

In Android 10 we need to add permission for USE_FULL_SCREEN_INTENT

Permissions changes for fullscreen intents

• Apps that target Android 10 or higher and use notifications with fullscreen intents must request the USE_FULL_SCREEN_INTENT permission in their app's manifest file.

• This is a normal permission, so the system automatically grants it to the requesting app.

Make sure you have added permission in manifest file

SAMPLE CODE

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.nilu.demo">

    <uses-permission android:name="android.permission.USE_FULL_SCREEN_INTENT" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>