在我的应用中,我从Web服务器获取数据。我使用了async task来获取数据。但是,问题是有时我的应用程序会在progressDialog.dismiss()
的onPostExecute中崩溃。但是,这并不总是发生。以下是我的代码:
异步任务
public class GetFeaturedStoreListAsyncTask extends AsyncTask<Void, Void, String>
{
Context ctx;
ProgressDialog pd;
ListView listFeaturedStore;
String dataUrl;
public static final String TAG = "GetFeaturedStoreAsyncTask";
public static ArrayList<StoreDescriptionDAO> featuredDAOList;
public GetFeaturedStoreListAsyncTask(String dataUrl, Context ctx, ListView listFeaturedStore)
{
this.dataUrl = dataUrl;
this.ctx = ctx;
this.listFeaturedStore = listFeaturedStore;
}//Constructor
@Override
protected void onPreExecute()
{
pd = new ProgressDialog(ctx);
pd.setMessage(ctx.getResources().getString(R.string.please_wait));
pd.show();
}//onPreExecute
@Override
protected String doInBackground(Void... params)
{
Log.v(TAG, "doInBackground called");
JSONParser jsonParser = new JSONParser();
String serverResponse = jsonParser.getJsonString(dataUrl);
return serverResponse;
}//doInBackground
@Override
protected void onPostExecute(String response)
{
FeaturedListAdapter mFeaturedListAdapter = null;
mFeaturedListAdapter = getFeaturedListAdapter(response);
if(mFeaturedListAdapter != null)
{
Log.v(TAG, "adapter not null");
listFeaturedStore.setAdapter(mFeaturedListAdapter);
listFeaturedStore.setLayoutAnimation(AnimationUtility.fastCascadeListViewAnimation());
pd.dismiss();
}//if
else
{
Log.v(TAG, "adapter null");
pd.dismiss();
SeattleNightLifeUtility.OpenUtilityDialog(ctx,
ctx.getResources().getString(R.string.network_error_msg));
}//else
}//onPostExecute
private FeaturedListAdapter getFeaturedListAdapter(String jString)
{
FeaturedListAdapter mFeaturedAdapter = null;
featuredDAOList =
ParsedFeaturedStoreDescData.getFeaturedStoreDesc(jString);
if(featuredDAOList != null
&& featuredDAOList.size() > 0)
{
mFeaturedAdapter = new FeaturedListAdapter(ctx, featuredDAOList);
Log.v(TAG, "arraylist size > 0");
return mFeaturedAdapter;
}//if
else
{
return null;
}//else
}//getFeaturedListAdapter
}//GetCityStoreAsyncTask
这是我的日志记录:
Activity com.dzo.seattlesnightlife.FeaturedActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4a715c38 that was originally added here
02-02 15:23:45.426: E/WindowManager(12627): android.view.WindowLeaked: Activity com.dzo.seattlesnightlife.FeaturedActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4a715c38 that was originally added here
02-02 15:23:45.426: E/WindowManager(12627): at android.view.ViewRoot.<init>(ViewRoot.java:247)
02-02 15:23:45.426: E/WindowManager(12627): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
02-02 15:23:45.426: E/WindowManager(12627): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
02-02 15:23:45.426: E/WindowManager(12627): at android.view.Window$LocalWindowManager.addView(Window.java:424)
02-02 15:23:45.426: E/WindowManager(12627): at android.app.Dialog.show(Dialog.java:241)
02-02 15:23:45.426: E/WindowManager(12627): at com.dzo.seattlesnightlife.asynctask.GetFeaturedStoreListAsyncTask.onPreExecute(GetFeaturedStoreListAsyncTask.java:40)
02-02 15:23:45.426: E/WindowManager(12627): at android.os.AsyncTask.execute(AsyncTask.java:391)
02-02 15:23:45.426: E/WindowManager(12627): at com.dzo.seattlesnightlife.FeaturedActivity$MyTimerTask$1.run(FeaturedActivity.java:173)
02-02 15:23:45.426: E/WindowManager(12627): at android.os.Handler.handleCallback(Handler.java:587)
02-02 15:23:45.426: E/WindowManager(12627): at android.os.Handler.dispatchMessage(Handler.java:92)
02-02 15:23:45.426: E/WindowManager(12627): at android.os.Looper.loop(Looper.java:123)
02-02 15:23:45.426: E/WindowManager(12627): at android.app.ActivityThread.main(ActivityThread.java:4633)
02-02 15:23:45.426: E/WindowManager(12627): at java.lang.reflect.Method.invokeNative(Native Method)
02-02 15:23:45.426: E/WindowManager(12627): at java.lang.reflect.Method.invoke(Method.java:521)
02-02 15:23:45.426: E/WindowManager(12627): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
02-02 15:23:45.426: E/WindowManager(12627): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
02-02 15:23:45.426: E/WindowManager(12627): at dalvik.system.NativeStart.main(Native Method)
02-02 15:23:45.456: V/GetFeaturedStoreAsyncTask(12627): arraylist size > 0
02-02 15:23:45.456: V/GetFeaturedStoreAsyncTask(12627): adapter not null
02-02 15:23:45.526: W/dalvikvm(12627): threadid=1: thread exiting with uncaught exception (group=0x400207d8)
02-02 15:23:45.536: E/AndroidRuntime(12627): FATAL EXCEPTION: main
02-02 15:23:45.536: E/AndroidRuntime(12627): java.lang.IllegalArgumentException: View not attached to window manager
02-02 15:23:45.536: E/AndroidRuntime(12627): at android.view.WindowManagerImpl.findViewLocked(WindowManagerImpl.java:355)
02-02 15:23:45.536: E/AndroidRuntime(12627): at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:200)
02-02 15:23:45.536: E/AndroidRuntime(12627): at android.view.Window$LocalWindowManager.removeView(Window.java:432)
02-02 15:23:45.536: E/AndroidRuntime(12627): at android.app.Dialog.dismissDialog(Dialog.java:278)
02-02 15:23:45.536: E/AndroidRuntime(12627): at android.app.Dialog.access$000(Dialog.java:71)
02-02 15:23:45.536: E/AndroidRuntime(12627): at android.app.Dialog$1.run(Dialog.java:111)
02-02 15:23:45.536: E/AndroidRuntime(12627): at android.app.Dialog.dismiss(Dialog.java:268)
02-02 15:23:45.536: E/AndroidRuntime(12627): at com.dzo.seattlesnightlife.asynctask.GetFeaturedStoreListAsyncTask.onPostExecute(GetFeaturedStoreListAsyncTask.java:63)
02-02 15:23:45.536: E/AndroidRuntime(12627): at com.dzo.seattlesnightlife.asynctask.GetFeaturedStoreListAsyncTask.onPostExecute(GetFeaturedStoreListAsyncTask.java:1)
02-02 15:23:45.536: E/AndroidRuntime(12627): at android.os.AsyncTask.finish(AsyncTask.java:417)
02-02 15:23:45.536: E/AndroidRuntime(12627): at android.os.AsyncTask.access$300(AsyncTask.java:127)
02-02 15:23:45.536: E/AndroidRuntime(12627): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
02-02 15:23:45.536: E/AndroidRuntime(12627): at android.os.Handler.dispatchMessage(Handler.java:99)
02-02 15:23:45.536: E/AndroidRuntime(12627): at android.os.Looper.loop(Looper.java:123)
02-02 15:23:45.536: E/AndroidRuntime(12627): at android.app.ActivityThread.main(ActivityThread.java:4633)
02-02 15:23:45.536: E/AndroidRuntime(12627): at java.lang.reflect.Method.invokeNative(Native Method)
02-02 15:23:45.536: E/AndroidRuntime(12627): at java.lang.reflect.Method.invoke(Method.java:521)
02-02 15:23:45.536: E/AndroidRuntime(12627): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
02-02 15:23:45.536: E/AndroidRuntime(12627): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
02-02 15:23:45.536: E/AndroidRuntime(12627): at dalvik.system.NativeStart.main(Native Method)
02-02 15:23:45.556: W/ActivityManager(180): Force finishing activity com.dzo.seattlesnightlife/.FeaturedActivity