How to open activity (incoming voip call) in Android 10

Check this link this will help you here

or

You need to ask for a permission "draw over other app" then you can make this as previous versions

  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            if (!Settings.canDrawOverlays(this)) {
                RequestPermission();

        }
        }

    private void RequestPermission() {
        // Check if Android P or higher
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            // Show alert dialog to the user saying a separate permission is needed
            // Launch the settings activity if the user prefers
            Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                    Uri.parse("package:" + BuildConfig.APPLICATION_ID));
            startActivityForResult(intent, 
            ACTION_MANAGE_OVERLAY_PERMISSION_REQUEST_CODE);
        }
     }

or You can use my this answer

https://stackoverflow.com/a/63699960/7108113

Please go through my blog on how to open activity for OS 10 and also how to display heads up notification and handle clicks on the action buttons.

https://medium.com/@dcostalloyd90/show-incoming-voip-call-notification-and-open-activity-for-android-os-10-5aada2d4c1e4

To open Activity over lock screen. you can use a high-notification with "full-screen intent" as CommonsWare's answer. But for more detail, you can try my solution as below code:

1. Create a foreground service then call buildNotification in onStartCommand method, the buildNotification method will return a notification which put into startForeground method parameter.

    public class IncomingCallService extends Service {
        public int onStartCommand(Intent intent, int flags, int startId) {
            Notification notification = buildNotification();
            startForeground(1, notification);
            return START_NOT_STICKY;
        }
    }
   

2. In buildNotification method, we will create notification with high priority, call category and a full screen intent.

    private Notification buildNotification() {
        Intent fullScreenIntent = new Intent(this, IncomingCallActivity.class);
        PendingIntent fullScreenPendingIntent = PendingIntent.getActivity(this, 0, fullScreenIntent, PendingIntent.FLAG_UPDATE_CURRENT);
        NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
   
        NotificationCompat.Builder notificationBuilder =
            new NotificationCompat.Builder(this)
                    .setSmallIcon(R.drawable.ic_notification_icon)
                    .setContentTitle("Incoming call")
                    .setContentText("(919) 555-1234")
                    .setPriority(NotificationCompat.PRIORITY_HIGH)
                    .setCategory(NotificationCompat.CATEGORY_CALL)
                    // Use a full-screen intent only for the highest-priority alerts where you
                    // have an associated activity that you would like to launch after the user
                    // interacts with the notification. Also, if your app targets Android 10
                    // or higher, you need to request the USE_FULL_SCREEN_INTENT permission in
                    // order for the platform to invoke this notification.
                    .setFullScreenIntent(fullScreenPendingIntent, true);
        notificationBuilder.setAutoCancel(true);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            notificationManager.createNotificationChannel(new NotificationChannel("123", "123", NotificationManager.IMPORTANCE_HIGH));
            notificationBuilder.setChannelId("123");
        }
        Notification incomingCallNotification = notificationBuilder.build();
        return incomingCallNotification;
    }
   

3. In onStartCommand, add a line of code to send ACTION_CLOSE_SYSTEM_DIALOGS broadcast action. This verify IMPORTANT to kick off full screen pending intent.

    public int onStartCommand(Intent intent, int flags, int startId) {
        Notification notification = buildNotification();
        startForeground(1, notification);
        sendBroadcast(new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS));
        return START_NOT_STICKY;
    }
   

4. Create full screen activity which you want to display over lock screen then you need to add setShowWhenLocked and setTurnScreenOn for display over lock screen. If not, your activity will be displayed behind lock screen. Below is my sample.

    public class IncomingCallActivity extends AppCompatActivity {
        protected void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_explore);
            setShowWhenLocked(true);
            setTurnScreenOn(true);
            getWindow().addFlags(
            WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
                    | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
                    | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
                    | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
                    | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON);
        }
    }
   

5. Now you must start IncomingCallService when you receive a call from your logic.

    public void startCallService() {
        Intent intent = new Intent(context, IncomingCallService.class);
        startForegroundService(intent);
    }
   

6. You must declare activity, service and some permission in your manifest as below:

    <uses-permission android:name="android.permission.USE_FULL_SCREEN_INTENT" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
    <application
       ...>
        <activity android:name=".IncomingCallActivity" />
        <service
            android:name=".IncomingCallService"
            android:enabled="true"
            android:exported="true" />
    </application>
   

I tested on google, samsung, vsmart phone. It work well. But for xaomi device. you need to enable some permission by flow below steps:

1. Long click to you app icon
2. Open app info
3. Click to "Other permission" item
4. Allow show on Lock screen

Now your app will work on xaomi device. If you face any problems with my solution, please leave a comment here. I will help you If I could.

Use a high-priority notification with a "full-screen intent". That will:

• Invoke your "full-screen intent" if the device is locked
• Otherwise, display a "heads-up" notification