ActivityResult result always zero: giving permissions with new method since startActivityForResult is deprecated

Question

I am extending support to an old app to Android 13 and I am seeing a lot of changes. First off, I've noticed that startActivityForResult is deprecated since Google decided to change how to handle permission requests and results.

Here there are few examples: OnActivityResult method is deprecated, what is the alternative? but honestly I did quite catch how the new way works. Only got that it seems that uses an Observer pattern.

This is how I am currently asking for overlay permissions:

   private void askForSystemOverlayPermission() {
        if (!Settings.canDrawOverlays(this)) {
            //If the draw over permission is not available open the settings screen
            //to grant the permission.
            Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                    Uri.parse("package:" + getPackageName()));
            startActivityForResult(intent, DRAW_OVER_OTHER_APP_PERMISSION_REQUEST_CODE);
        }
    }

 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == DRAW_OVER_OTHER_APP_PERMISSION_REQUEST_CODE) {
            if (!Settings.canDrawOverlays(this)) {
                //Permission is not available. Display error text.
                errorToastDrawOverOtherApp();
                finish();
            }
        } else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }

This is how I've updated my code:

ActivityResultLauncher<Intent> activityResultLaunch = registerForActivityResult(
            new ActivityResultContracts.StartActivityForResult(),
            new ActivityResultCallback<ActivityResult>() {
                @Override
                public void onActivityResult(ActivityResult result) {
                    System.out.println("Code:"+result.getResultCode());
                    if (result.getResultCode() == RESULT_CODE_1) {
                        // ToDo : Do your stuff...

                    } else if(result.getResultCode() == RESULT_CODE_2) {
                        // ToDo : Do your stuff...
                    }
                }
            });

if (!Settings.canDrawOverlays(this)) {
            Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                    Uri.parse("package:" + getPackageName()));
            activityResultLaunch.launch(intent);
        }

but like mentioned I am getting always a result = 0. What I am doing wrong?

Answer 1

This is how I am currently asking for overlay permissions

You are using startActivityForResult(). That Intent action is not documented to return a result.

I am getting always a result = 0

That Intent action is not documented to return a result, so 0 is the expected value.

If you are expecting something akin to DRAW_OVER_OTHER_APP_PERMISSION_REQUEST_CODE from your earlier code, that is not how ActivityResultContracts works. DRAW_OVER_OTHER_APP_PERMISSION_REQUEST_CODE is a request code, not a result code. And, you will note that you are not supplying a request code, because that is handled internally by ActivityResultContracts.StartActivityForResult.