适配器getView 方法报了空指针

@Override

public View getView(int position, View convertView, ViewGroup parent) {

// TODO Auto-generated method stub

ViewHolder holder=null;

if (convertView==null) {

convertView=inflater.inflate(R.layout.item_gridview, parent, false);

holder=new ViewHolder();

holder.imgView=(ImageView) findViewById(R.id.id_imgview);

holder.imgBtn=(ImageButton) findViewById(R.id.id_imgbtn);

convertView.setTag(holder);

}else{

holder=(ViewHolder) convertView.getTag();

}

holder.imgView.setImageResource(R.drawable.ic_dialog_alert);

holder.imgBtn.setImageResource(R.drawable.btn_check_on_disabled_holo_light);

ImageLoader.getImageLoader(3,Type.LIFO).loadImage(dirPath+"/"+imgPathList.get(position), holder.imgView);

return convertView;

}

class ViewHolder{

ImageView imgView;

ImageButton imgBtn;

}

09-07 10:47:40.062: E/AndroidRuntime(23353): FATAL EXCEPTION: main

09-07 10:47:40.062: E/AndroidRuntime(23353): Process: com.example.imooc_imageloader, PID: 23353

09-07 10:47:40.062: E/AndroidRuntime(23353): java.lang.NullPointerException

09-07 10:47:40.062: E/AndroidRuntime(23353): at com.example.imooc_imageloader.MainActivity$ImageAdapter.getView(MainActivity.java:100)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.widget.AbsListView.obtainView(AbsListView.java:2263)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.widget.GridView.onMeasure(GridView.java:1044)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.View.measure(View.java:16497)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:719)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:455)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.View.measure(View.java:16497)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.View.measure(View.java:16497)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)

09-07 10:47:40.062: E/AndroidRuntime(23353): at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.View.measure(View.java:16497)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)

09-07 10:47:40.062: E/AndroidRuntime(23353): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.View.measure(View.java:16497)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1916)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1113)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1295)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5670)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.Choreographer.doCallbacks(Choreographer.java:574)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.Choreographer.doFrame(Choreographer.java:544)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.os.Handler.handleCallback(Handler.java:733)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.os.Handler.dispatchMessage(Handler.java:95)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.os.Looper.loop(Looper.java:136)

09-07 10:47:40.062: E/AndroidRuntime(23353): at android.app.ActivityThread.main(ActivityThread.java:5017)

09-07 10:47:40.062: E/AndroidRuntime(23353): at java.lang.reflect.Method.invokeNative(Native Method)

09-07 10:47:40.062: E/AndroidRuntime(23353): at java.lang.reflect.Method.invoke(Method.java:515)

09-07 10:47:40.062: E/AndroidRuntime(23353): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)

09-07 10:47:40.062: E/AndroidRuntime(23353): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)

09-07 10:47:40.062: E/AndroidRuntime(23353): at dalvik.system.NativeStart.main

      

问题找到了，应该是

holder.imgView=(ImageView) convertView.findViewById(R.id.id_imgview);

holder.imgBtn=(ImageButton) convertView.findViewById(R.id.id_imgbtn);

或者

item选项不要写错了