我希望在ListView中显示图标，然后使用libs Universal Imageloader。但是给我错误。
请给我一个解决方案或编辑我的代码。
感谢您的帮助！
抱歉我的英语不好。
代码片段
public class InfoTeacherFragment extends Fragment {
ProgressDialog pDialog;
Context mContext;
Vector<ArrayList<String>> data;
ArrayList<String> Name;
ArrayList<String> School;
ArrayList<String> Link;
ArrayList<String> Icon;
ListView lvItem;
DisplayImageOptions options;
public InfoTeacherFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.drawable.ic_mission)
.showImageForEmptyUri(R.drawable.ic_empty)
.showImageOnFail(R.drawable.ic_error).cacheInMemory(true)
.cacheOnDisk(true).considerExifParams(true)
.bitmapConfig(Bitmap.Config.RGB_565).build();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.teacherinfo_layout,
container, false);
mContext = container.getContext();
lvItem = (ListView) rootView.findViewById(R.id.lvTeacher);
if (Utils.isOnline(mContext) == true
&& Utils.KEY_CHECK_SUCCESS.equals("SUCCESS")) {
new LoadData().execute();
lvItem.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapter, View view,
int position, long id) {
Intent intent = new Intent(mContext, NewsItemView.class);
if (Link != null) {
intent.putExtra("URL", Link.get(position));
startActivity(intent);
}
}
});
} else if (Utils.isOnline(mContext) == true
&& Utils.KEY_CHECK_SUCCESS.equals("FAIL")) {
Utils.MyToast(Utils.KEYWORK_ERROR[0], R.drawable.warning_icon,
mContext, false);
}
return rootView;
}
@Override
public void onDestroy() {
super.onDestroy();
AnimateFirstDisplayListener.displayedImages.clear();
}
class LoadData extends AsyncTask<Void, Void, String> {
private String Url = "http://scv.udn.vn/dhdn/trdhsp/page/1";
@Override
protected void onPreExecute() {
pDialog = ProgressDialog.show(mContext, "", Utils.KEYWORK_ERROR[2]);
data = new Vector<ArrayList<String>>();
Name = new ArrayList<String>();
School = new ArrayList<String>();
Link = new ArrayList<String>();
Icon = new ArrayList<String>();
super.onPreExecute();
}
@Override
protected String doInBackground(Void... params) {
data = Utils.getInformationTeacher(Url);
if (!(data.isEmpty())) {
return Utils.KEY_CHECK_SUCCESS;
} else {
return Utils.KEY_CHECK_FAIL;
}
}
@Override
protected void onPostExecute(String result) {
if (result.equals(Utils.KEY_CHECK_SUCCESS)) {
pDialog.dismiss();
Name = data.get(0);
School = data.get(1);
Icon = data.get(2);
Link = data.get(3);
((ListView) lvItem).setAdapter(new InfoTeacher(mContext, Name,
School, Icon));
} else if (result.equals(Utils.KEY_CHECK_FAIL)) {
pDialog.dismiss();
Utils.MyToast(Utils.KEYWORK_ERROR[0], R.drawable.warning_icon,
mContext, false);
}
super.onPostExecute(result);
}
}
class InfoTeacher extends BaseAdapter {
private Context context;
private ArrayList<String> Icon = new ArrayList<String>();
private ArrayList<String> Name = new ArrayList<String>();
private ArrayList<String> School = new ArrayList<String>();
private LayoutInflater inflater;
ImageLoadingListener animateFirstListener = new AnimateFirstDisplayListener();
public InfoTeacher(Context context, ArrayList<String> Name,
ArrayList<String> School, ArrayList<String> Icon) {
this.context = context;
this.Name = Name;
this.Icon = Icon;
this.School = School;
inflater = LayoutInflater.from(getActivity());
}
@Override
public int getCount() {
return Name.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View view, ViewGroup arg2) {
View rowView = view;
ViewHolder holder;
if (rowView == null) {
holder = new ViewHolder();
// inflater = (LayoutInflater) context
// .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
rowView = inflater.inflate(R.layout.teacher_layout, null);
holder.Name = (TextView) rowView
.findViewById(R.id.tv_NameTeacher);
holder.School = (TextView) rowView.findViewById(R.id.tv_School);
holder.ic_naviga = (ImageView) rowView
.findViewById(R.id.ivNaviga);
holder.icon = (ImageView) rowView
.findViewById(R.id.iv_IconTeacher);
rowView.setTag(holder);
} else
holder = (ViewHolder) view.getTag();
final String mIcon = Icon.get(position);
holder.Name.setText(Name.get(position).toString());
holder.School.setText(School.get(position).toString());
ImageLoader.getInstance().displayImage(mIcon, holder.icon, options,
animateFirstListener);
return rowView;
}
}
static class ViewHolder {
ImageView icon;
TextView Name;
TextView School;
ImageView ic_naviga;
}
private static class AnimateFirstDisplayListener extends
SimpleImageLoadingListener {
static final List<String> displayedImages = Collections
.synchronizedList(new LinkedList<String>());
@Override
public void onLoadingComplete(String imageUri, View view,
Bitmap loadedImage) {
if (loadedImage != null) {
ImageView imageView = (ImageView) view;
boolean firstDisplay = !displayedImages.contains(imageUri);
if (firstDisplay) {
FadeInBitmapDisplayer.animate(imageView, 500);
displayedImages.add(imageUri);
}
}
}
}
}
错误
12-29 07:54:34.400: E/AndroidRuntime(7687): FATAL EXCEPTION: main
12-29 07:54:34.400: E/AndroidRuntime(7687): java.lang.IllegalArgumentException: view must not be null
12-29 07:54:34.400: E/AndroidRuntime(7687): at com.nostra13.universalimageloader.core.imageaware.ViewAware.<init>(ViewAware.java:70)
12-29 07:54:34.400: E/AndroidRuntime(7687): at com.nostra13.universalimageloader.core.imageaware.ViewAware.<init>(ViewAware.java:50)
12-29 07:54:34.400: E/AndroidRuntime(7687): at com.nostra13.universalimageloader.core.imageaware.ImageViewAware.<init>(ImageViewAware.java:44)
12-29 07:54:34.400: E/AndroidRuntime(7687): at com.nostra13.universalimageloader.core.ImageLoader.displayImage(ImageLoader.java:365)
12-29 07:54:34.400: E/AndroidRuntime(7687): at com.nostra13.universalimageloader.core.ImageLoader.displayImage(ImageLoader.java:340)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.readnews.main.InfoTeacherFragment$InfoTeacher.getView(InfoTeacherFragment.java:196)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.widget.AbsListView.obtainView(AbsListView.java:2159)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.widget.ListView.makeAndAddView(ListView.java:1831)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.widget.ListView.fillDown(ListView.java:674)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.widget.ListView.fillFromTop(ListView.java:735)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.widget.ListView.layoutChildren(ListView.java:1652)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.widget.AbsListView.onLayout(AbsListView.java:1994)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.View.layout(View.java:14008)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.ViewGroup.layout(ViewGroup.java:4373)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1021)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.View.layout(View.java:14008)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.ViewGroup.layout(ViewGroup.java:4373)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.View.layout(View.java:14008)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.ViewGroup.layout(ViewGroup.java:4373)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:678)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.View.layout(View.java:14008)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.ViewGroup.layout(ViewGroup.java:4373)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.View.layout(View.java:14008)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.ViewGroup.layout(ViewGroup.java:4373)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1663)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1521)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.View.layout(View.java:14008)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.ViewGroup.layout(ViewGroup.java:4373)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.View.layout(View.java:14008)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.ViewGroup.layout(ViewGroup.java:4373)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1892)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1711)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.Choreographer.doFrame(Choreographer.java:532)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.os.Handler.handleCallback(Handler.java:725)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.os.Handler.dispatchMessage(Handler.java:92)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.os.Looper.loop(Looper.java:137)
12-29 07:54:34.400: E/AndroidRuntime(7687): at android.app.ActivityThread.main(ActivityThread.java:5041)
12-29 07:54:34.400: E/AndroidRuntime(7687): at java.lang.reflect.Method.invokeNative(Native Method)
12-29 07:54:34.400: E/AndroidRuntime(7687): at java.lang.reflect.Method.invoke(Method.java:511)
12-29 07:54:34.400: E/AndroidRuntime(7687): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-29 07:54:34.400: E/AndroidRuntime(7687): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-29 07:54:34.400: E/AndroidRuntime(7687): at dalvik.system.NativeStart.main(Native Method)
行代码错误：
ImageLoader.getInstance().displayImage(mIcon, holder.icon, options,
animateFirstListener);
答案 0 :(得分：0)
您尚未初始化ImageLoader。
在适配器中显示图像之前添加此代码：
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context).build();
ImageLoader.getInstance().init(config);