ProgressDialog в расширяет AsyncTask

Question

мне нужно показать ProgressDialog в AsyncTask продолжается ... но ...

public class TareaAsincrona extends AsyncTask<Void, Void, Void> { 
    protected void onPreExecute() 
    { 
     pdialog = new ProgressDialog(Principal.this); 
     pdialog.setMessage("Wolas"); 
     pdialog.setIndeterminate(true); 
     pdialog.setCancelable(false); 
     pdialog.show(); 
     } 
    protected void onPostExecute() 
    { pdialog.dismiss(); } 

    protected Void doInBackground(Void... params) { .... .... } //// //// } 
} 

LogCat

04-19 14:59:40.844: E/dalvikvm(21264): Unable to open stack trace file '/data/anr/traces.txt': Permission denied 
04-19 14:59:41.434: E/WindowManager(21264): Activity dsm.transporte_ordtra.Principal has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4165d0a0 that was originally added here 
04-19 14:59:41.434: E/WindowManager(21264): android.view.WindowLeaked: Activity dsm.transporte_ordtra.Principal has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4165d0a0 that was originally added here 
04-19 14:59:41.434: E/WindowManager(21264):  at android.view.ViewRootImpl.<init>(ViewRootImpl.java:344) 
04-19 14:59:41.434: E/WindowManager(21264):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:267) 
04-19 14:59:41.434: E/WindowManager(21264):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:215) 
04-19 14:59:41.434: E/WindowManager(21264):  at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:140) 
04-19 14:59:41.434: E/WindowManager(21264):  at android.view.Window$LocalWindowManager.addView(Window.java:537) 
04-19 14:59:41.434: E/WindowManager(21264):  at android.app.Dialog.show(Dialog.java:278) 
04-19 14:59:41.434: E/WindowManager(21264):  at dsm.transporte_ordtra.Principal$TareaAsincrona.onPreExecute(Principal.java:211) 
04-19 14:59:41.434: E/WindowManager(21264):  at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:561) 
04-19 14:59:41.434: E/WindowManager(21264):  at android.os.AsyncTask.execute(AsyncTask.java:511) 
04-19 14:59:41.434: E/WindowManager(21264):  at dsm.transporte_ordtra.Principal$3.onClick(Principal.java:145) 
04-19 14:59:41.434: E/WindowManager(21264):  at android.view.View.performClick(View.java:3511) 
04-19 14:59:41.434: E/WindowManager(21264):  at android.view.View$PerformClick.run(View.java:14105) 
04-19 14:59:41.434: E/WindowManager(21264):  at android.os.Handler.handleCallback(Handler.java:605) 
04-19 14:59:41.434: E/WindowManager(21264):  at android.os.Handler.dispatchMessage(Handler.java:92) 
04-19 14:59:41.434: E/WindowManager(21264):  at android.os.Looper.loop(Looper.java:137) 
04-19 14:59:41.434: E/WindowManager(21264):  at android.app.ActivityThread.main(ActivityThread.java:4424) 
04-19 14:59:41.434: E/WindowManager(21264):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-19 14:59:41.434: E/WindowManager(21264):  at java.lang.reflect.Method.invoke(Method.java:511) 
04-19 14:59:41.434: E/WindowManager(21264):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
04-19 14:59:41.434: E/WindowManager(21264):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
04-19 14:59:41.434: E/WindowManager(21264):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

Вы доступ к вашей деятельности в предварительно выполнить здесь

pdialog = new ProgressDialog(Principal.this); 

Вы можете, например, объявить pdialog в своем классе и использовать его внутри, уже инициализированный.

class TareaAsincrona{ 
    ProgressDialog instancedProgressDialog; 

    public TareaAsincrona (ProgressDialog instancedProgressDialog){ 
     myProgressDialog = instancedProgressDialog; 
    } 
    //Your code continues here.... 

} 

.