android: Bitmap size exceeds VM budget-优快云博客

本文提供了一个名为BetterActivity的基类，旨在解决Android应用中因布局变化导致的内存泄漏问题。通过重写关键方法，如onResume、onPause和onDestroy等，确保了在Activity状态改变时能够释放不再使用的资源，例如drawable对象。此外，还介绍了一种递归方法来清理视图层级中的所有drawable资源。

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Here's a drop-in solution if anyone is interested. Just derive from BetterActivity instead of Activity. This will clean up all the drawables on orientation change, and likely on activity switches etc...

public abstract class BetterActivity extends Activity
{
  @Override
  protected void onResume()
  {
    System.gc();
    super.onResume();
  }
  
  @Override
  protected void onPause()
  {
    super.onPause();
    System.gc();
  }
  
  @Override
  public void setContentView(int layoutResID)
  {
    ViewGroup mainView = (ViewGroup)
      LayoutInflater.from(this).inflate(layoutResID, null);
    
    setContentView(mainView);
  }
  
  @Override
  public void setContentView(View view)
  {
    super.setContentView(view);
    
    m_contentView = (ViewGroup)view;
  }
  
  @Override
  public void setContentView(View view, LayoutParams params)
  {
    super.setContentView(view, params);
    
    m_contentView = (ViewGroup)view;
  }
  
  @Override
  protected void onDestroy()
  {
    super.onDestroy();
    
    // Fixes android memory  issue 8488 :
    // http://code.google.com/p/android/issues/detail?id=8488
    nullViewDrawablesRecursive(m_contentView);
    
    m_contentView = null;
    System.gc();
  }
  
  private void nullViewDrawablesRecursive(View view)
  {
    if(view != null)
    {
      try
      {
        ViewGroup viewGroup = (ViewGroup)view;
        
        int childCount = viewGroup.getChildCount();
        for(int index = 0; index < childCount; index++)
        {
          View child = viewGroup.getChildAt(index);
          nullViewDrawablesRecursive(child);
        }
      }
      catch(Exception e)
      {          
      }
      
      nullViewDrawable(view);
    }    
  }

  private void nullViewDrawable(View view)
  {
    try
    {
      view.setBackgroundDrawable(null);
    }
    catch(Exception e)
    {          
    }
    
    try
    {
      ImageView imageView = (ImageView)view;
      imageView.setImageDrawable(null);
      imageView.setBackgroundDrawable(null);
    }
    catch(Exception e)
    {          
    }
  }

  // The top level content view.
  private ViewGroup m_contentView = null;
}