How to ask user to unlock device on clicking notification action in android?

Question

      I am displaying a notification from my application and this notification has an action in it, when user clicks on the action, the corresponding action class is called with the intent I set. Now, I want to perform a particular action but before that the user needs to unlock the screen if it is pin/pattern protected. I am not able to ask user to unlock device, i.e open up the unlock keypad/pattern on lock screen.
Below is the code I have,

    //HandleAction is a java class that extends IntentService
    Intent intent = new Intent(context, HandleAction.class);
    intent.putExtra(key, "my_value"); //Used to send information to action class
    PendingIntent pi = PendingIntent.getService(context, 0, intent,
                                 PendingIntent.FLAG_UPDATE_CURRENT);

    NotificationCompat.Builder notification = new NotificationCompat.Builder(mContext);
    //set the title, icon etc for builder and add action as below
    notification.addAction(icon, "my_label", pi);

When user clicks on the notification action, I get the control to onHandleIntent in MyAction.java
In here, I want to request user to unlock device if password protected and then perform an action. How can I request user to unlock device in onHandleIntent?

I came across using KeyguardManager and KeyguardLock to acheive this but keyguardManager.newKeyguardLock is deprecated method and I want to avoid this. So, the next was using "FLAG_TURN_SCREEN_ON" and "FLAG_KEEP_SCREEN_ON" but I am unable to figure out how to use them in this context. I don't launch any window from my action class, it is just an operation like incrementing my counter. After clicking it the notification should disappear, perform my action and thats it.

I found a similar question Unlock phone , but the way it was did is by launching a dummy/empty activity.

Thanks in advance for any help, suggestions :)

Answer 1

In the Activity you are opening (that is behind the lock screen) you should tell system to lift the keyguard (e.g. in onCreate())

For API >= 26

KeyguardManager km = (KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE);
km.requestDismissKeyguard(this, null); // you may add callback listener here

For API < 26:

getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);

If device is not locked securely it would unlock it immediately, and if it is locked, it will ask user to do it.

Answer 2

Use Activity intent in pending intent insted of Service

Intent intent = new Intent(context, MyActivity.class);
intent.putExtra(key, "my_value"); //Used to send information to action class
PendingIntent pi = PendingIntent.getActivity(context, 0, intent,
                                 PendingIntent.FLAG_UPDATE_CURRENT);