go to a specific page when the back button is pressed

Question

I am developing an html app for android. I have some html files in my asset folder. The index.html file loads when app is started. In index.html I have a link to categories.html. When I choose any category and after pressing back button(hardware, there is no button in html) it goes to categories.html. But the problem is that I have option switch between categories from the categories, so when I press the back button it goes to the previous category.

For eg: I have 3 categories - green, yellow and red. I selected the category green. From green, switched to red, and from red to yellow. When I press the back button from yellow it goes to red. But it should go to categories.html

Is there any solution ?

Answer 1

1. Search Google - So many answers

2. Search Stackoverflow - No need if you did step 1

   @Override
   public boolean onKeyDown(int keyCode, KeyEvent event) {
       if(event.getAction() == KeyEvent.ACTION_DOWN){
           switch(keyCode)
           {
           case KeyEvent.KEYCODE_BACK:
               //open category page here
               return true;
           }
   
       }
       return super.onKeyDown(keyCode, event);
   }
   

See How to go back to previous page if back button is pressed in WebView?