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An incoming call on the lock screen for a VOIP application, such as Whatsapp / Viber / Line / Skype on Marshmallow

We plan to release an update for our Android application, which is based on the Twilio Voice SDK. Our customers want to get more relatives, for example, when they can see the screen to accept or reject a call (for example, Skype / Whatsapp / Viber / Line, etc.) Instead of clicking on the notification, and then on the dialog box. In addition, this should also work on the lock screen.

At the moment, I am successfully opening activity in my application and showing accept or reject buttons. It works when the application is in the foreground or in the background. Here is a piece of code that achieves this. I changed the notify () method in VoiceFirebaseMessagingService.java to show the action when onMessageRecived is called to notify you of an incoming call.

private void notify(CallInvite callInvite, int notificationId) {
        String callSid = callInvite.getCallSid();

        if (callInvite.getState() == CallInvite.State.PENDING) {
            soundPoolManager.playRinging();

            System.out.println("Disabling keyguard and accquiring wake lock");



            Intent intent = new Intent(this, OnCallActivityNew.class);
            intent.setAction(OnCallActivityNew.ACTION_INCOMING_CALL);
            intent.putExtra(OnCallActivityNew.INCOMING_CALL_NOTIFICATION_ID, notificationId);
            intent.putExtra(OnCallActivityNew.INCOMING_CALL_INVITE, callInvite);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
            PendingIntent pendingIntent =
                    PendingIntent.getActivity(this, notificationId, intent, PendingIntent.FLAG_ONE_SHOT);
            /*
             * Pass the notification id and call sid to use as an identifier to cancel the
             * notification later
             */
            Bundle extras = new Bundle();
            extras.putInt(NOTIFICATION_ID_KEY, notificationId);
            extras.putString(CALL_SID_KEY, callSid);

            NotificationCompat.Builder notificationBuilder =
                    new NotificationCompat.Builder(this)
                            .setSmallIcon(R.drawable.ic_call_end_white_24px)
                            .setContentTitle(getString(R.string.app_name))
                            .setContentText(callInvite.getFrom() + " is calling.")
                            .setAutoCancel(true)
                            .setExtras(extras)
                            .setContentIntent(pendingIntent)
                            .setGroup("test_app_notification")
                            .setOngoing(true)
                            .setColor(Color.rgb(214, 10, 37));
            notificationManager.notify(notificationId, notificationBuilder.build());
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.putExtras(extras);
            globalintent =  intent;

            new Handler(Looper.getMainLooper()).postDelayed(new Runnable() {
                @Override
                public void run() {
                    startActivity(globalintent);
                }
            },2000);

        } else {
            SoundPoolManager.getInstance(this).stopRinging();
            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
                /*
                 * If the incoming call was cancelled then remove the notification by matching
                 * it with the call sid from the list of notifications in the notification drawer.
                 */
                StatusBarNotification[] activeNotifications = notificationManager.getActiveNotifications();
                for (StatusBarNotification statusBarNotification : activeNotifications) {
                    Notification notification = statusBarNotification.getNotification();
                    Bundle extras = notification.extras;
                    String notificationCallSid = extras.getString(CALL_SID_KEY);

                    if (callSid.equals(notificationCallSid)) {
                        notificationManager.cancel(extras.getInt(NOTIFICATION_ID_KEY));
                    } else {
                        sendCallInviteToActivity(callInvite, notificationId);
                    }
                }
            } else {
                /*
                 * Prior to Android M the notification manager did not provide a list of
                 * active notifications so we lazily clear all the notifications when
                 * receiving a cancelled call.
                 *
                 * In order to properly cancel a notification using
                 * NotificationManager.cancel(notificationId) we should store the call sid &
                 * notification id of any incoming calls using shared preferences or some other form
                 * of persistent storage.
                 */
                notificationManager.cancelAll();
            }
        }
    }

Also, in onCreate () of OnCallActivityNew.java, I mentioned the following code.

@Override
    protected void onCreate(Bundle savedInstanceState) {
        System.out.println("on create of activity is called for oncallactivitynew");

        super.onCreate(savedInstanceState);
        KeyguardManager kgm = (KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE);
        boolean isKeyguardUp = kgm.inKeyguardRestrictedInputMode();
        KeyguardManager.KeyguardLock kgl = kgm.newKeyguardLock("OnCallActivityNew");

        if(isKeyguardUp){
            kgl.disableKeyguard();
            isKeyguardUp = false;
        }

        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
        wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, "My Tag");
        wl.acquire();
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN |
                        WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD |
                        WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED |
                        WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON,
                WindowManager.LayoutParams.FLAG_FULLSCREEN |
                        WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD |
                        WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED |
                        WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);

        setContentView(R.layout.activity_on_call);


        coordinatorLayout = (CoordinatorLayout) fin
       ..... ///more code below to add listener to different buttons
}

The only problem is that when the phone is locked, this action opens and is called onDestroy (), and I can not show the screen to accept and reject buttons.

The desired behavior that I want is to have a mechanism in which you can receive calls even on the lock screen in the same way as the applications I mentioned above.

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, , , . , , , Android, :

// These flags ensure that the activity can be launched when the screen is locked.
Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
        | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
        | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

// to wake up screen
PowerManager pm = (PowerManager) getApplicationContext().getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wakeLock = pm.newWakeLock((PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP), "TAG");
wakeLock.acquire();

// to release screen lock
KeyguardManager keyguardManager = (KeyguardManager) getApplicationContext().getSystemService(Context.KEYGUARD_SERVICE);
KeyguardManager.KeyguardLock keyguardLock = keyguardManager.newKeyguardLock("TAG");
keyguardLock.disableKeyguard();
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