Android

왜 이런 일이 일어나는지 이해할 수없는 것 같습니다. 이 코드 :

mProgressDialog = ProgressDialog.show(this, "", getString(R.string.loading), true);

잘 작동합니다. 그러나이 코드 :

mProgressDialog = ProgressDialog.show(getApplicationContext(), "", getString(R.string.loading), true);

다음 예외가 발생합니다.

W/WindowManager(  569): Attempted to add window with non-application token WindowToken{438bee58 token=null}.  Aborting.
D/AndroidRuntime( 2049): Shutting down VM
W/dalvikvm( 2049): threadid=3: thread exiting with uncaught exception (group=0x4001aa28)
E/AndroidRuntime( 2049): Uncaught handler: thread main exiting due to uncaught exception
E/AndroidRuntime( 2049): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.tastekid.TasteKid/com.tastekid.TasteKid.YouTube}: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
E/AndroidRuntime( 2049):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401)
E/AndroidRuntime( 2049):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
E/AndroidRuntime( 2049):    at android.app.ActivityThread.access$2100(ActivityThread.java:116)
E/AndroidRuntime( 2049):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
E/AndroidRuntime( 2049):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 2049):    at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 2049):    at android.app.ActivityThread.main(ActivityThread.java:4203)
E/AndroidRuntime( 2049):    at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 2049):    at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime( 2049):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
E/AndroidRuntime( 2049):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
E/AndroidRuntime( 2049):    at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 2049): Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
E/AndroidRuntime( 2049):    at android.view.ViewRoot.setView(ViewRoot.java:460)
E/AndroidRuntime( 2049):    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
E/AndroidRuntime( 2049):    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
E/AndroidRuntime( 2049):    at android.app.Dialog.show(Dialog.java:238)
E/AndroidRuntime( 2049):    at android.app.ProgressDialog.show(ProgressDialog.java:107)
E/AndroidRuntime( 2049):    at android.app.ProgressDialog.show(ProgressDialog.java:90)
E/AndroidRuntime( 2049):    at com.tastekid.TasteKid.YouTube.onCreate(YouTube.java:45)
E/AndroidRuntime( 2049):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
E/AndroidRuntime( 2049):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
E/AndroidRuntime( 2049):    ... 11 more

왜 이런 일이 발생하는지 아이디어가 있습니까? 나는 이것을 onCreate메소드 에서 호출하고 있습니다 .

답변

@Override
public void onCreate(Bundle savedInstanceState) {
    // do all your other stuff here

    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            mProgressDialog = ProgressDialog.show(
               YouTube.this.getApplicationContext(), "",
               YouTube.this.getString(R.string.loading), true);

            // start time consuming background process here
        }
    }, 1000); // starting it in 1 second
}

Dialog dialog = new Dialog(this);

Dialog dialog = new Dialog(getApplicationContext());

builder = new AlertDialog.Builder(getApplicationContext());

builder = new AlertDialog.Builder(ThisActivityClassName.this);

public class MyApp extends Application

private static MyApp appInstance;

    public static void showProgressDialog( CharSequence title, CharSequence message )
{
    prog = ProgressDialog.show(appInstance, title, message, true); // Never Do This!
}

myButton.setOnClickListener(new OnClickListener(){
    public void onClick(View v) {
        MyDialogue dialog = new MyDialogue(getApplicationContext());
        dialog.show();
    }
});

myButton.setOnClickListener(new OnClickListener(){
    public void onClick(View v) {
        MyDialogue dialog = new MyDialogue(v.getContext());
        dialog.show();
    }
});

OCItemizedOverlay currentLocationOverlay = new OCItemizedOverlay(pin,getApplicationContext);

final AlertDialog.Builder builder = new AlertDialog.Builder(getParent());

final AlertDialog.Builder builder = new AlertDialog.Builder(this);