extends SherlockFragment{
我使用福爾摩斯片段和滑動菜單開發應用,並在我的第一frament佈局我必須表現出與URL圖像網格視圖,我已經決定使用Universal Image Loader顯示圖像在片段中的GridView
我可以得到json和所有的值,但是在將適配器設置爲ImageAdapter類中的網格視圖時,我得到了NULL指針異常。
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View v = inflater.inflate(R.layout.videos_layout, container,
false);
this.setRetainInstance(true);
gridView = (GridView) v.findViewById(R.id.gridview);
imageLoader = ImageLoader.getInstance();
return v;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
int i = 0;
for (HashMap<String, String> map : VideoItems) {
imageUrls[i] = map.get(TAG_THUMNAIL);
System.out.println(imageUrls[i]);
i++;
}
defaultOptions = new DisplayImageOptions.Builder().cacheInMemory()
.cacheOnDisc().build();
config = new ImageLoaderConfiguration.Builder(getActivity()
.getApplicationContext()).defaultDisplayImageOptions(
defaultOptions).build();
imageLoader.init(config);
gridView.setAdapter(new ImageAdapter(getActivity()));
gridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
}
});
this.gridView.setOnScrollListener(new PauseOnScrollListener(
imageLoader, true, true));
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context ctx){
mContext=ctx;
}
@Override
public int getCount() {
return imageUrls.length;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return position;
}
public class ViewHolder{
ImageView imageView;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder=new ViewHolder();
Log.v("hi", "hhdsjf");
if (convertView == null) {
convertView = LayoutInflater.from(mContext).inflate(
R.layout.video_layout_item, parent, false);
holder.imageView= (ImageView) convertView
.findViewById(R.id.image);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
try {
imageLoader.displayImage(imageUrls[position], holder.imageView, defaultOptions);
} catch (Exception e) {
e.printStackTrace();
}
return convertView;
}
}
LOG Cat error:
03-12 15:37:47.164: E/AndroidRuntime(9671): java.lang.NullPointerException
03-12 15:37:47.164:E/AndroidRuntime(9671):在com.slidingmenu.example.fragments.VideosFragment.onActivityCreated(VideosFragment.java:112) 03 -12 15:37:47.164:E/AndroidRuntime(9671):at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:891) 03-12 15:37:47.164:E/AndroidRuntime(9671) :at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1080) 03-12 15:37:47.164:E/AndroidRuntime(9671):at android.support.v4.app.BackStackRecord.run( BackStackRecord.java: 622) 03-12 15:37:47.164:E/AndroidRuntime(9671):at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1416) 03-12 15:37:47.164:E/AndroidRuntime(9671):在android.support.v4.app.FragmentManagerImpl $ 1.run(FragmentManager.java:420) 03-12 15:37:47.164:E/AndroidRuntime(9671):at android.os.Handler.handleCallback (Handler.java:587) 03-12 15:37:47.164:E/AndroidRuntime(9671):at android.os.Handler.dispatchMessage(Handler.java:92) 03-12 15:37:47.164:E/AndroidRuntime(9671):at android.os.Looper.loop(Looper.java:130) 03-12 15:37:47.164:E/AndroidRuntime(9671):at android.app.ActivityThread.main(ActivityThread.java :3687) 03-12 15:37:47.164:E/AndroidRuntime(9671):at java.lang.reflect.Method.invokeNative(Native Method) 03-12 15:37:47.164:E/AndroidRuntime(9671):在java.lang.reflect.Method.invoke(Method.java:507) 03-12 15:37:47.164:E/AndroidRuntime(9671) :at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:867) 03-12 15:37:47.164:E/AndroidRuntime(9671):at com.android.internal.os.ZygoteInit。主(ZygoteInit.java:625) 03-12 15:37:47.164:E/AndroidRuntime(9671):在dalvik.system.NativeStart.main(本機方法)
i couldn't find where i missed to initialize something., Thanks in advance.,
看線112 – jlopez 2013-03-12 09:18:28
this.gridView.setAdapter(新ImageAdapter(getActivity())); 這是我的112線,這有什麼問題? – 2013-03-12 09:19:41
NullPointerException在這些行 – jlopez 2013-03-12 09:23:40