How do I release images and avoid outOfMemory exc-n when navigating back and forth between activities[android]

Question

I have a children tale app - 18 pages, each page is an activity with a background image, short story and sound for every word(textView) in a story, and some animations.

I notice, when i go to next page, the memory is consumed;

it is also consumed when i go back to previous page(activity)! I get outOfMemory exception when the app reaches about 182MB usage - this can happen anytime.

• How do I release images if the image is a background for RelativeLayout in every page ?

• every time i navigate to next page, the previous is destroyed - should not the images it loads be released from memory as well?

  public class Page8 extends Activity{
  ImageView forward ;
  ImageView backward ;
  RelativeLayout main ;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
  
  super.onCreate(savedInstanceState);
  setContentView(R.layout.page8);
  forward = (ImageView)findViewById(R.id.to_page_9);
  backward = (ImageView)findViewById(R.id.to_page_7);
  forward.setOnTouchListener(new View.OnTouchListener() {
      @Override
      public boolean onTouch(View v, MotionEvent event) {
          if (event.getAction() != MotionEvent.ACTION_DOWN) return false;
          Intent intent = new Intent(Page8.this, Page9.class);
          startActivity(intent);
          return true;
      }
  });
  backward.setOnTouchListener(new View.OnTouchListener() {
      @Override
      public boolean onTouch(View v, MotionEvent event) {
          if (event.getAction() != MotionEvent.ACTION_DOWN) return false;
          Intent intent = new Intent(Page8.this, Page7.class);
          startActivity(intent);
          return true;
      }
  });
  }
     @Override
     public void onStop(){
     main = (RelativeLayout)findViewById(R.id.main) ;
     main.releaseMemory()?;
  
    }
   }
  

Answer 1

I think you have HD images, you should optimize images and scale down them.