BaseActivity.java

public abstract class BaseActivity extends SherlockFragmentActivity {
  @Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		mCommit = new LinkedList<FragmentTransaction>();
		mStateSaved = false;
	}

	@Override
	protected void onStart() {
		super.onStart();
		mStateSaved = false;
	}
	@Override
	protected void onResume() {

		super.onResume();
		mStateSaved = false;
	}

	@Override
	protected void onStop() {
		super.onStop();
		mStateSaved = true;
	}

	@Override
	protected void onDestroy() {
		mCommit.clear();
		super.onDestroy();
	}


    protected LinkedList<FragmentTransaction> mCommit;
    	protected boolean mStateSaved;
    
    	protected void onResumeFragments() {
    		super.onResumeFragments();
    		while (!mCommit.isEmpty()) {
    			FragmentTransaction ft = mCommit.removeFirst();
    			ft.commit();
    		}
    	};
    
    	/**
    	 * 模擬 FragmentManager 的行為 在 state saved 的時候暫存 Transaction 待下次恢復時再提交 當
    	 * Transaction 發生在回調時，用這個方法提交避免發生 IllegalStateException
    	 * 
    	 * @param ft
    	 * @return commit 不能正確執行時返回false
    	 */
    	protected boolean commit(FragmentTransaction ft) {
    		try {
    			if (!mStateSaved) {
    				ft.commit();
    			} else {
    				mCommit.addLast(ft);
    			}
    			return true;
    		} catch (IllegalStateException ex) {
    			return false;
    		}
    	}
  }

Have you tested this?

@luisfeiliurp yes, This code already run in some products which have million user totally, It help me avoid illegalStateException when activity go to background but not fix when activity destroyed.

Hi Douo,
Do you have any solution when activity destroyed?

thx a lot . But I have some confusion on it .

"1. we discard all fragment transaction after activity has been destroyed" , based on this , I have a question , If onSaveInstanceState method be called by the framework , is it possible the Activity is still alive ?

• if impossible , I think the codes on BaseActivity may can't make sense , because the activity will be recreate when restore .
• if possible , can you give me some example ?

Is there something I misunderstand ? hope for you answer :)