在android phonegap应用中单击“后退”按钮时强制关闭

Question

I have created android phonegap app using html,css,javascript and jquery.When i hit the back button my app gets force closed.My error in the logcat is below:

ERROR/AndroidRuntime(23383): FATAL EXCEPTION: main
    ERROR/AndroidRuntime(23383): android.view.WindowManager
    $BadTokenException: Unable to add window -- token
    android.os.BinderProxy@48c59828 is not valid; is your activity
    running?
    at android.view.ViewRoot.setView(ViewRoot.java:505)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:207)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:121)
    at android.view.Window$LocalWindowManager.addView(Window.java:424)
    at android.app.Dialog.show(Dialog.java:259)
    at android.app.AlertDialog$Builder.show(AlertDialog.java:802)
    at com.phonegap.DroidGap$GapClient.onJsAlert(DroidGap.java:983)
    at android.webkit.CallbackProxy.handleMessage(CallbackProxy.java:531)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:123)
    at android.app.ActivityThread.main(ActivityThread.java:4632)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:521)
    at com.android.internal.os.ZygoteInit
    $MethodAndArgsCaller.run(ZygoteInit.java:871)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629)
    at dalvik.system.NativeStart.main(Native Method)
    ERROR/(1364): Dumpstate > /data/log/dumpstate_app_error

Please kindly guide me where i am wrong.Thanks in advance.

Answer 1

 android.os.BinderProxy@48c59828 is not valid; is your activity running? 

This error mostly occurs when you are trying to close/finish the Activity when some ProgressDialog is running. So, you are trying to finish() Activity before dismissing Progress Dialog. You should first try to dismiss the ProgressDialog then finish the Activity.

Answer 2

Check if the activity is finishing before showing that dialog.

if (!isFinishing()) {
    showDialog(MY_DIALOG);
}

The crash occurs when a background thread tries to show a dialog just when the UI thread is exiting.

Answer 3

$BadTokenException:

this type of error because of context problem. pass proper context in your code,