control the previous button and lifecycleofapp

Issue

I have some problems with controlling the previous button and lifecycle of app, this is scheme of my application, I try to describe my knowledge about it.

I can move between categories without any limitation. For example, I run my app the firts screen which is named third category then I move to second category and then to third one. When I click the previous button It moves me to second category, because this was the previous screen, but I want that "physical previous button" exit from whole application, no matter what I made before, so it should switch every existing activity to onStop and onDestroy or how should be done?

I try to destroy previous category activity when I move to next one,by finish(); but I addedto onDestroy some methods which clears list, so during lifetime of application it's not desired thing.

Solution

use this code inside onBackPressed()

 Intent intent = new Intent(Intent.ACTION_MAIN);
 intent.addCategory(Intent.CATEGORY_HOME);
 intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 startActivity(intent);        

Other Solutions may help you.

Answered By - Ketan Ahir