片段应该在asynctask中下载带有名称和图像的json，并在gridview中显示它们 这是我得到的例外
06-17 16:34:30.207: W/dalvikvm(689): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
06-17 16:34:30.297: E/AndroidRuntime(689): FATAL EXCEPTION: main
06-17 16:34:30.297: E/AndroidRuntime(689): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.ViewRootImpl.setView(ViewRootImpl.java:589)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:326)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:224)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:149)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.app.Dialog.show(Dialog.java:277)
06-17 16:34:30.297: E/AndroidRuntime(689): at project.almashy.TopRatedFragment$DownloadJSON.onPreExecute(TopRatedFragment.java:107)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.os.AsyncTask.execute(AsyncTask.java:534)
06-17 16:34:30.297: E/AndroidRuntime(689): at project.almashy.TopRatedFragment.methodThatStartsTheAsyncTask(TopRatedFragment.java:50)
06-17 16:34:30.297: E/AndroidRuntime(689): at project.almashy.TopRatedFragment.onCreate(TopRatedFragment.java:40)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.support.v4.app.Fragment.performCreate(Fragment.java:1437)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:877)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.support.v4.app.FragmentManagerImpl.performPendingDeferredStart(FragmentManager.java:807)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.support.v4.app.Fragment.setUserVisibleHint(Fragment.java:801)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.support.v4.app.FragmentPagerAdapter.setPrimaryItem(FragmentPagerAdapter.java:130)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.support.v4.view.ViewPager.populate(ViewPager.java:1062)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.support.v4.view.ViewPager.populate(ViewPager.java:911)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1432)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.View.measure(View.java:15172)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:617)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:399)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.View.measure(View.java:15172)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.View.measure(View.java:15172)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.widget.LinearLayout.measureVertical(LinearLayout.java:833)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.View.measure(View.java:15172)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
06-17 16:34:30.297: E/AndroidRuntime(689): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2148)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.View.measure(View.java:15172)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1850)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1102)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1275)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4214)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.Choreographer.doCallbacks(Choreographer.java:555)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.Choreographer.doFrame(Choreographer.java:525)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.os.Handler.handleCallback(Handler.java:615)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.os.Handler.dispatchMessage(Handler.java:92)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.os.Looper.loop(Looper.java:137)
06-17 16:34:30.297: E/AndroidRuntime(689): at android.app.ActivityThread.main(ActivityThread.java:4745)
06-17 16:34:30.297: E/AndroidRuntime(689): at java.lang.reflect.Method.invokeNative(Native Method)
06-17 16:34:30.297: E/AndroidRuntime(689): at java.lang.reflect.Method.invoke(Method.java:511)
06-17 16:34:30.297: E/AndroidRuntime(689): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
06-17 16:34:30.297: E/AndroidRuntime(689): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
06-17 16:34:30.297: E/AndroidRuntime(689): at dalvik.system.NativeStart.main(Native Method)
这是我的片段代码
public class TopRatedFragment extends SherlockFragment{
GridView gridView;
JSONObject jsonobject;
JSONArray jsonarray;
ImageAdapter adapter;
ProgressDialog mProgressDialog;
ArrayList<HashMap<String, String>> arraylist;
public static String PROD_NAME = "prod_name";
public static String PROD_SMALL_IMG = "prod_small_img";
View v;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
methodThatStartsTheAsyncTask();
}
private void methodThatStartsTheAsyncTask() {
AsyncTask<Void, Void, Void> testAsyncTask = new DownloadJSON(new FragmentCallback() {
@Override
public void onTaskDone() {
methodThatDoesSomethingWhenTaskIsDone();
}
});
testAsyncTask.execute();
}
private void methodThatDoesSomethingWhenTaskIsDone() {
gridView = (GridView) v.findViewById(R.id.gridview);
gridView.setAdapter(new adapter.ImageAdapter(getActivity().getBaseContext(), arraylist));
}
public interface FragmentCallback {
public void onTaskDone();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
v = inflater.inflate(R.layout.top_rated, container, false);
return v;
}
@Override
public void onStart() {
super.onStart();
//getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
}
// DownloadJSON AsyncTask
private class DownloadJSON extends AsyncTask<Void, Void, Void> {
private FragmentCallback mFragmentCallback;
public DownloadJSON(FragmentCallback fragmentCallback) {
mFragmentCallback = fragmentCallback;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progressdialog
mProgressDialog = new ProgressDialog(getActivity().getBaseContext());
// Set progressdialog title
mProgressDialog.setTitle("Android JSON Parse Tutorial");
// Set progressdialog message
mProgressDialog.setMessage("Loading...");
mProgressDialog.setIndeterminate(false);
// Show progressdialog
mProgressDialog.show();
}
@Override
protected Void doInBackground(Void... params) {
// Create the array
arraylist = new ArrayList<HashMap<String, String>>();
// Retrive JSON Objects from the given website URL in JSONfunctions.class
//jsonobject = JSONfunctions.getJSONfromURL("http://fcis.zzl.org/android_login_api_hegazy/products.php");
jsonobject = JSONParser
.getJSONfromURL("http://10.0.2.2/android_login_api/products.php");
try {
// Locate the array name
jsonarray = jsonobject.getJSONArray("products");
//jsonarray = jsonobject.getJSONArray(name);
for (int i = 0; i < jsonarray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
jsonobject = jsonarray.getJSONObject(i);
// Retrive JSON Objects
map.put("rank", jsonobject.getString("prod_name"));
map.put("flag", jsonobject.getString("prod_small_img"));
// Set the JSON Objects into the array
arraylist.add(map);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void args) {
mFragmentCallback.onTaskDone();
// Close the progressdialog
mProgressDialog.dismiss();
}
}
}
这是我的适配器
public class ImageAdapter extends BaseAdapter {
// Declare Variables
Context context;
LayoutInflater inflater;
ArrayList<HashMap<String, String>> data;
ImageLoader imageLoader;
public ImageAdapter(Context context, ArrayList<HashMap<String, String>> arraylist) {
this.context = context;
this.data = arraylist;
imageLoader = new ImageLoader(context);
}
public View getView(final int position, View convertView, ViewGroup parent) {
// Declare Variables
TextView prod_name;
ImageView prod_small_img;
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(R.layout.mobile, parent, false);
// Get the position from the results
HashMap<String, String> resultp = new HashMap<String, String>();
resultp = data.get(position);
// Locate the ImageView in listview_item.xml
prod_small_img = (ImageView) itemView.findViewById(R.id.grid_item_image);
// Locate the TextViews in listview_item.xml
prod_name = (TextView) itemView.findViewById(R.id.grid_item_label);
// Capture position and set results to the TextViews
prod_name.setText(resultp.get(TopRatedFragment.PROD_NAME));
// Capture position and set results to the ImageView
// Passes flag images URL into ImageLoader.class to download and cache
// images
imageLoader.DisplayImage(resultp.get(TopRatedFragment.PROD_SMALL_IMG), prod_small_img);
return itemView;
}
@Override
public int getCount() {
return data.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
}
我不知道出了什么问题！
答案 0 :(得分：2)
更改mProgressDialog = new ProgressDialog(getActivity().getBaseContext());
到
mProgressDialog = new ProgressDialog(getActivity());
您应该始终只使用getActivity()作为片段中的上下文，因为活动是从上下文