在asyncTask中顯示Progressdialog

Question

我有一個從web服務獲取結果的異步任務。我的班級我試圖顯示和隱藏進度對話框。但是在從Web服務獲得結果的過程中，會出現一些錯誤，您可以在日誌貓中看到。我認爲問題在於我試圖以異步模式獲得結果，然後結束當前活動。因爲我的異步任務正在構造函數中獲取我的活動並使用它顯示ProgressDialog，所以在完成活動並嘗試在異步任務中顯示另一個進度對話框後，就會出現此問題。我該怎麼辦？

public class AsyncCallWs extends AsyncTask<String, Void, String> { 

    private ProgressDialog dialog; 
    public String methodName=""; 
    private WebService ws; 
    private ArrayList<ServiceParam> paramsList; 
    private boolean hasParams; 
    private Activity activity; 
    private OnTaskCompleted listener; 

    public AsyncCallWs(Activity activity,OnTaskCompleted listener,String methodName) { 
     xLog.position(); 
     try { 
      this.methodName = methodName; 
      this.activity = activity; 
      hasParams = false; 
      this.listener = listener; 
     } catch (Exception e) { 
      xLog.error(e.getMessage()); 
     } 
    } 

    public AsyncCallWs(Activity activity,OnTaskCompleted listener,String methodName,ArrayList<ServiceParam> params) { 
     xLog.position(); 
     try { 
      this.methodName = methodName; 
      this.activity = activity; 
      this.paramsList = params; 
      hasParams = true; 
      this.listener = listener; 
     } catch (Exception e) { 
      xLog.error(e.getMessage()); 
     } 
    } 

    @Override 
    protected void onPreExecute() { 
     this.dialog = new ProgressDialog(activity); 
     this.dialog.setMessage("Loading..."); 
     this.dialog.show(); 
    } 

    @Override 
    protected String doInBackground(String... params) { 
     //Do something... 
    } 

    @Override 
    protected void onPostExecute(String result) { 
     xLog.position(); 

     if (this.dialog.isShowing()) { 
      this.dialog.dismiss(); 
     } 
     listener.onTaskCompleted(result,methodName); 
     xLog.info("Output of current AsyncTask is:"+ result); 

    } 
} 

的logcat：

12-11 08:08:58.808: E/WindowManager(26772): Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40fc05a0 V.E..... R.....ID 0,0-168,114} that was originally added here 
12-11 08:08:58.808: E/WindowManager(26772): android.view.WindowLeaked: Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40fc05a0 V.E..... R.....ID 0,0-168,114} that was originally added here 
12-11 08:08:58.808: E/WindowManager(26772):  at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354) 
12-11 08:08:58.808: E/WindowManager(26772):  at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216) 
12-11 08:08:58.808: E/WindowManager(26772):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) 
12-11 08:08:58.808: E/WindowManager(26772):  at android.app.Dialog.show(Dialog.java:281) 
12-11 08:08:58.808: E/WindowManager(26772):  at ClassLibrary.AsyncCallWs.onPreExecute(AsyncCallWs.java:85) 
12-11 08:08:58.808: E/WindowManager(26772):  at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586) 
12-11 08:08:58.808: E/WindowManager(26772):  at android.os.AsyncTask.execute(AsyncTask.java:534) 
12-11 08:08:58.808: E/WindowManager(26772):  at com.example.shareholders.Sync.doSync(Sync.java:307) 
12-11 08:08:58.808: E/WindowManager(26772):  at com.example.shareholders.Login.clickHandler(Login.java:70) 
12-11 08:08:58.808: E/WindowManager(26772):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-11 08:08:58.808: E/WindowManager(26772):  at java.lang.reflect.Method.invoke(Method.java:511) 
12-11 08:08:58.808: E/WindowManager(26772):  at android.view.View$1.onClick(View.java:3594) 
12-11 08:08:58.808: E/WindowManager(26772):  at android.view.View.performClick(View.java:4204) 
12-11 08:08:58.808: E/WindowManager(26772):  at android.view.View$PerformClick.run(View.java:17355) 
12-11 08:08:58.808: E/WindowManager(26772):  at android.os.Handler.handleCallback(Handler.java:725) 
12-11 08:08:58.808: E/WindowManager(26772):  at android.os.Handler.dispatchMessage(Handler.java:92) 
12-11 08:08:58.808: E/WindowManager(26772):  at android.os.Looper.loop(Looper.java:137) 
12-11 08:08:58.808: E/WindowManager(26772):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
12-11 08:08:58.808: E/WindowManager(26772):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-11 08:08:58.808: E/WindowManager(26772):  at java.lang.reflect.Method.invoke(Method.java:511) 
12-11 08:08:58.808: E/WindowManager(26772):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
12-11 08:08:58.808: E/WindowManager(26772):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
12-11 08:08:58.808: E/WindowManager(26772):  at dalvik.system.NativeStart.main(Native Method) 
12-11 08:08:58.837: E/WindowManager(26772): Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40fef4a8 V.E..... R.....ID 0,0-168,114} that was originally added here 
12-11 08:08:58.837: E/WindowManager(26772): android.view.WindowLeaked: Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40fef4a8 V.E..... R.....ID 0,0-168,114} that was originally added here 
12-11 08:08:58.837: E/WindowManager(26772):  at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354) 
12-11 08:08:58.837: E/WindowManager(26772):  at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216) 
12-11 08:08:58.837: E/WindowManager(26772):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) 
12-11 08:08:58.837: E/WindowManager(26772):  at android.app.Dialog.show(Dialog.java:281) 
12-11 08:08:58.837: E/WindowManager(26772):  at ClassLibrary.AsyncCallWs.onPreExecute(AsyncCallWs.java:85) 
12-11 08:08:58.837: E/WindowManager(26772):  at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586) 
12-11 08:08:58.837: E/WindowManager(26772):  at android.os.AsyncTask.execute(AsyncTask.java:534) 
12-11 08:08:58.837: E/WindowManager(26772):  at com.example.shareholders.Sync.doSync(Sync.java:311) 
12-11 08:08:58.837: E/WindowManager(26772):  at com.example.shareholders.Login.clickHandler(Login.java:70) 
12-11 08:08:58.837: E/WindowManager(26772):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-11 08:08:58.837: E/WindowManager(26772):  at java.lang.reflect.Method.invoke(Method.java:511) 
12-11 08:08:58.837: E/WindowManager(26772):  at android.view.View$1.onClick(View.java:3594) 
12-11 08:08:58.837: E/WindowManager(26772):  at android.view.View.performClick(View.java:4204) 
12-11 08:08:58.837: E/WindowManager(26772):  at android.view.View$PerformClick.run(View.java:17355) 
12-11 08:08:58.837: E/WindowManager(26772):  at android.os.Handler.handleCallback(Handler.java:725) 
12-11 08:08:58.837: E/WindowManager(26772):  at android.os.Handler.dispatchMessage(Handler.java:92) 
12-11 08:08:58.837: E/WindowManager(26772):  at android.os.Looper.loop(Looper.java:137) 
12-11 08:08:58.837: E/WindowManager(26772):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
12-11 08:08:58.837: E/WindowManager(26772):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-11 08:08:58.837: E/WindowManager(26772):  at java.lang.reflect.Method.invoke(Method.java:511) 
12-11 08:08:58.837: E/WindowManager(26772):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
12-11 08:08:58.837: E/WindowManager(26772):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
12-11 08:08:58.837: E/WindowManager(26772):  at dalvik.system.NativeStart.main(Native Method) 
12-11 08:08:58.867: E/WindowManager(26772): Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40fb88b0 V.E..... R.....ID 0,0-168,114} that was originally added here 
12-11 08:08:58.867: E/WindowManager(26772): android.view.WindowLeaked: Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40fb88b0 V.E..... R.....ID 0,0-168,114} that was originally added here 
12-11 08:08:58.867: E/WindowManager(26772):  at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354) 
12-11 08:08:58.867: E/WindowManager(26772):  at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216) 
12-11 08:08:58.867: E/WindowManager(26772):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) 
12-11 08:08:58.867: E/WindowManager(26772):  at android.app.Dialog.show(Dialog.java:281) 
12-11 08:08:58.867: E/WindowManager(26772):  at ClassLibrary.AsyncCallWs.onPreExecute(AsyncCallWs.java:85) 
12-11 08:08:58.867: E/WindowManager(26772):  at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586) 
12-11 08:08:58.867: E/WindowManager(26772):  at android.os.AsyncTask.execute(AsyncTask.java:534) 
12-11 08:08:58.867: E/WindowManager(26772):  at com.example.shareholders.Sync.doSync(Sync.java:316) 
12-11 08:08:58.867: E/WindowManager(26772):  at com.example.shareholders.Login.clickHandler(Login.java:70) 
12-11 08:08:58.867: E/WindowManager(26772):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-11 08:08:58.867: E/WindowManager(26772):  at java.lang.reflect.Method.invoke(Method.java:511) 
12-11 08:08:58.867: E/WindowManager(26772):  at android.view.View$1.onClick(View.java:3594) 
12-11 08:08:58.867: E/WindowManager(26772):  at android.view.View.performClick(View.java:4204) 
12-11 08:08:58.867: E/WindowManager(26772):  at android.view.View$PerformClick.run(View.java:17355) 
12-11 08:08:58.867: E/WindowManager(26772):  at android.os.Handler.handleCallback(Handler.java:725) 
12-11 08:08:58.867: E/WindowManager(26772):  at android.os.Handler.dispatchMessage(Handler.java:92) 
12-11 08:08:58.867: E/WindowManager(26772):  at android.os.Looper.loop(Looper.java:137) 
12-11 08:08:58.867: E/WindowManager(26772):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
12-11 08:08:58.867: E/WindowManager(26772):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-11 08:08:58.867: E/WindowManager(26772):  at java.lang.reflect.Method.invoke(Method.java:511) 
12-11 08:08:58.867: E/WindowManager(26772):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
12-11 08:08:58.867: E/WindowManager(26772):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
12-11 08:08:58.867: E/WindowManager(26772):  at dalvik.system.NativeStart.main(Native Method) 
12-11 08:08:58.878: E/WindowManager(26772): Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{4102c668 V.E..... R.....ID 0,0-168,114} that was originally added here 
12-11 08:08:58.878: E/WindowManager(26772): android.view.WindowLeaked: Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{4102c668 V.E..... R.....ID 0,0-168,114} that was originally added here 
12-11 08:08:58.878: E/WindowManager(26772):  at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354) 
12-11 08:08:58.878: E/WindowManager(26772):  at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216) 
12-11 08:08:58.878: E/WindowManager(26772):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) 
12-11 08:08:58.878: E/WindowManager(26772):  at android.app.Dialog.show(Dialog.java:281) 
12-11 08:08:58.878: E/WindowManager(26772):  at ClassLibrary.AsyncCallWs.onPreExecute(AsyncCallWs.java:85) 
12-11 08:08:58.878: E/WindowManager(26772):  at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586) 
12-11 08:08:58.878: E/WindowManager(26772):  at android.os.AsyncTask.execute(AsyncTask.java:534) 
12-11 08:08:58.878: E/WindowManager(26772):  at com.example.shareholders.Sync.doSync(Sync.java:320) 
12-11 08:08:58.878: E/WindowManager(26772):  at com.example.shareholders.Login.clickHandler(Login.java:70) 
12-11 08:08:58.878: E/WindowManager(26772):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-11 08:08:58.878: E/WindowManager(26772):  at java.lang.reflect.Method.invoke(Method.java:511) 
12-11 08:08:58.878: E/WindowManager(26772):  at android.view.View$1.onClick(View.java:3594) 
12-11 08:08:58.878: E/WindowManager(26772):  at android.view.View.performClick(View.java:4204) 
12-11 08:08:58.878: E/WindowManager(26772):  at android.view.View$PerformClick.run(View.java:17355) 
12-11 08:08:58.878: E/WindowManager(26772):  at android.os.Handler.handleCallback(Handler.java:725) 
12-11 08:08:58.878: E/WindowManager(26772):  at android.os.Handler.dispatchMessage(Handler.java:92) 
12-11 08:08:58.878: E/WindowManager(26772):  at android.os.Looper.loop(Looper.java:137) 
12-11 08:08:58.878: E/WindowManager(26772):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
12-11 08:08:58.878: E/WindowManager(26772):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-11 08:08:58.878: E/WindowManager(26772):  at java.lang.reflect.Method.invoke(Method.java:511) 
12-11 08:08:58.878: E/WindowManager(26772):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
12-11 08:08:58.878: E/WindowManager(26772):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
12-11 08:08:58.878: E/WindowManager(26772):  at dalvik.system.NativeStart.main(Native Method) 
12-11 08:08:58.898: E/WindowManager(26772): Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{4103cd98 V.E..... R.....ID 0,0-168,114} that was originally added here 
12-11 08:08:58.898: E/WindowManager(26772): android.view.WindowLeaked: Activity com.example.shareholders.Login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{4103cd98 V.E..... R.....ID 0,0-168,114} that was originally added here 
12-11 08:08:58.898: E/WindowManager(26772):  at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354) 
12-11 08:08:58.898: E/WindowManager(26772):  at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216) 
12-11 08:08:58.898: E/WindowManager(26772):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) 
12-11 08:08:58.898: E/WindowManager(26772):  at android.app.Dialog.show(Dialog.java:281) 
12-11 08:08:58.898: E/WindowManager(26772):  at ClassLibrary.AsyncCallWs.onPreExecute(AsyncCallWs.java:85) 
12-11 08:08:58.898: E/WindowManager(26772):  at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586) 
12-11 08:08:58.898: E/WindowManager(26772):  at android.os.AsyncTask.execute(AsyncTask.java:534) 
12-11 08:08:58.898: E/WindowManager(26772):  at com.example.shareholders.Sync.doSync(Sync.java:325) 
12-11 08:08:58.898: E/WindowManager(26772):  at com.example.shareholders.Login.clickHandler(Login.java:70) 
12-11 08:08:58.898: E/WindowManager(26772):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-11 08:08:58.898: E/WindowManager(26772):  at java.lang.reflect.Method.invoke(Method.java:511) 
12-11 08:08:58.898: E/WindowManager(26772):  at android.view.View$1.onClick(View.java:3594) 
12-11 08:08:58.898: E/WindowManager(26772):  at android.view.View.performClick(View.java:4204) 
12-11 08:08:58.898: E/WindowManager(26772):  at android.view.View$PerformClick.run(View.java:17355) 
12-11 08:08:58.898: E/WindowManager(26772):  at android.os.Handler.handleCallback(Handler.java:725) 
12-11 08:08:58.898: E/WindowManager(26772):  at android.os.Handler.dispatchMessage(Handler.java:92) 
12-11 08:08:58.898: E/WindowManager(26772):  at android.os.Looper.loop(Looper.java:137) 
12-11 08:08:58.898: E/WindowManager(26772):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
12-11 08:08:58.898: E/WindowManager(26772):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-11 08:08:58.898: E/WindowManager(26772):  at java.lang.reflect.Method.invoke(Method.java:511) 
12-11 08:08:58.898: E/WindowManager(26772):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
12-11 08:08:58.898: E/WindowManager(26772):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
12-11 08:08:58.898: E/WindowManager(26772):  at dalvik.system.NativeStart.main(Native Method) 


12-11 08:08:59.118: D/AndroidRuntime(26772): Shutting down VM 
12-11 08:08:59.138: W/dalvikvm(26772): threadid=1: thread exiting with uncaught exception (group=0x40a71930) 
12-11 08:08:59.167: E/AndroidRuntime(26772): FATAL EXCEPTION: main 
12-11 08:08:59.167: E/AndroidRuntime(26772): java.lang.IllegalArgumentException: View not attached to window manager 
12-11 08:08:59.167: E/AndroidRuntime(26772): at android.view.WindowManagerGlobal.findViewLocked(WindowManagerGlobal.java:383) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at android.view.WindowManagerGlobal.removeView(WindowManagerGlobal.java:285) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:79) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at android.app.Dialog.dismissDialog(Dialog.java:323) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at android.app.Dialog.dismiss(Dialog.java:306) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at ClassLibrary.AsyncCallWs.onPostExecute(AsyncCallWs.java:113) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at ClassLibrary.AsyncCallWs.onPostExecute(AsyncCallWs.java:1) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at android.os.AsyncTask.finish(AsyncTask.java:631) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at android.os.AsyncTask.access$600(AsyncTask.java:177) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at android.os.Handler.dispatchMessage(Handler.java:99) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at android.os.Looper.loop(Looper.java:137) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at android.app.ActivityThread.main(ActivityThread.java:5041) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at java.lang.reflect.Method.invokeNative(Native Method) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at java.lang.reflect.Method.invoke(Method.java:511) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
12-11 08:08:59.167: E/AndroidRuntime(26772): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

你需要調用this.dialog.dismiss();完成之前，你的Activity

Answer 2

你可以使用一個無頭片段和做內部的，而不是活動裏你的異步處理。

這裏有一個教程： http://techbandhu.wordpress.com/2013/07/02/android-headless-fragment/