在使用gridview/listView中只報空指針，沒有說我的代碼具體哪裏空的異常

1.先看錯誤代碼：

 public View getView(int position, View convertView, ViewGroup parent)
 {
  switch (mMetadataList.get(position).getType())
  {
  case Constant.MOVIE:
   bindMovieView(position, convertView); //錯將此處爲引用傳遞，修改方法是：convertView =  bindMovieView(position, convertView); 
   break;
  case Constant.PHOTP:
   convertView = bindPhotoView(position, convertView);
   break;
  }
  return convertView;
 }

2.將bingMovie(int position, View convertView)改成有返回值,最後將return convertView如下；

private View bindMovieView(int position, View convertView)
	{
		MovieViewHolder movieHolder;
		if (null == convertView)
		{
			MyLog.d(TAG, "movie中null == convertView");
			movieHolder = new MovieViewHolder();
			convertView = mInflater.inflate(R.layout.favourite_item_movie, null);//此處已經將convertView指向別的地址，已//經不是傳遞過來的地址
			movieHolder.name = (TextView) convertView.findViewById(R.id.favourite_movie_name);
			movieHolder.imageView = (MyImageView) convertView.findViewById(R.id.favourite_movie_img);

			convertView.setTag(movieHolder);
		} else
		{
			movieHolder = (MovieViewHolder) convertView.getTag();
		}

		movieHolder.name.setText(mMetadataList.get(position).getName());
		movieHolder.imageView.setImageResource(R.drawable.test);
		
		return convertView;
	}

錯誤日誌：

1-26 16:48:33.209: E/AndroidRuntime(3169): FATAL EXCEPTION: main
11-26 16:48:33.209: E/AndroidRuntime(3169): java.lang.NullPointerException
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.widget.AbsListView.obtainView(AbsListView.java:2269)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.widget.GridView.onMeasure(GridView.java:1030)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.View.measure(View.java:15172)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:617)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:399)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.View.measure(View.java:15172)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:617)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:399)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.View.measure(View.java:15172)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:617)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:399)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.View.measure(View.java:15172)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.View.measure(View.java:15172)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.View.measure(View.java:15172)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2148)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.View.measure(View.java:15172)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1848)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1100)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1273)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4212)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:736)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.Choreographer.doCallbacks(Choreographer.java:566)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.Choreographer.doFrame(Choreographer.java:536)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:722)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.os.Handler.handleCallback(Handler.java:615)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.os.Handler.dispatchMessage(Handler.java:92)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.os.Looper.loop(Looper.java:137)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at android.app.ActivityThread.main(ActivityThread.java:4745)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at java.lang.reflect.Method.invokeNative(Native Method)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at java.lang.reflect.Method.invoke(Method.java:511)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
11-26 16:48:33.209: E/AndroidRuntime(3169):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)

11-26 16:48:33.209: E/AndroidRuntime(3169):  at dalvik.system.NativeStart.main(Native Method)

原因分析：