Android removeView crashed

Question

I'm creating a screen lock app, and faced notification able to drag down in the lock screen.

I've research it and found this solution to block the notification bar by using addView code below, but I cannot remove the view after user unlocked my app. Please advice how to remove the view.

I've try to use manager.removeView(view); in public void onDestroy() { but it crashed after run this code.

This is the error message

FATAL EXCEPTION: main
Process: com.mehuljoisar.lockscreen, PID: 10256
java.lang.IllegalArgumentException: View=android.view.View{42348cc0 V.ED.... ........ 0,0-0,0} not attached to window manager
at android.view.WindowManagerGlobal.findViewLocked(WindowManagerGlobal.java:373)
at android.view.WindowManagerGlobal.removeView(WindowManagerGlobal.java:302)
at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:79)
at com.mehuljoisar.lockscreen.LockScreenActivity.disablePullNotificationTouch(LockScreenActivity.java:261)
at com.mehuljoisar.lockscreen.LockScreenActivity.access$100(LockScreenActivity.java:24)
at com.mehuljoisar.lockscreen.LockScreenActivity$2.onClick(LockScreenActivity.java:113)
at android.view.View.performClick(View.java:4469)
at android.view.View$PerformClick.run(View.java:18788)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5347)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:835)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:651)
at dalvik.system.NativeStart.main(Native Method)

Where should I put the removeView code?

private void disablePullNotificationTouch(String gg) {
  WindowManager manager = ((WindowManager)   getApplicationContext().getSystemService(Context.WINDOW_SERVICE));
  WindowManager.LayoutParams localLayoutParams = new WindowManager.LayoutParams();
  localLayoutParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ERROR;
  localLayoutParams.gravity = Gravity.TOP; //make the line top
  localLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |

  // this is to enable the notification to recieve touch events
  WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |
  // Draws over status bar
  WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;

  localLayoutParams.width = WindowManager.LayoutParams.MATCH_PARENT;
  localLayoutParams.height = (int) (25 *   getResources().getDisplayMetrics().scaledDensity);
  localLayoutParams.format = PixelFormat.RGBX_8888;
  View view = new View(this);
  if(gg == "on") {
    manager.addView(view, localLayoutParams);
  }else {
    manager.removeView(view);
  }
}

@Override
  public void onCreate(Bundle savedInstanceState) {
    disablePullNotificationTouch("on");
  }
@Override
  public void onDestroy() {
    super.onDestroy();
    disablePullNotificationTouch("off");
  }

Found answer at another post . http://stackoverflow.com/questions/25284233/prevent-status-bar-for-appearing-android-modified?answertab=active#tab-top — Jasper Jye, Apr 11 '16 at 04:08

score 1 · Answer 1 · answered Apr 11 '16 at 03:00

1

You use

WindowManager manager = ((WindowManager)   this.getSystemService(Context.WINDOW_SERVICE));

Not use

WindowManager manager = ((WindowManager)   getApplicationContext().getSystemService(Context.WINDOW_SERVICE));

Try it!

answered Apr 11 '16 at 03:00

Nguyễn Trung Hiếu

2,004
1
10
22

Thanks for your answer, but it still crashed after remove view.. I edit the question again, that is how I remove the view. – Jasper Jye Apr 11 '16 at 03:14
Yes. Hope it help you? – Nguyễn Trung Hiếu Apr 11 '16 at 03:32
ahh, just realize that , If I use WindowManager manager = ((WindowManager) this.getSystemService(Context.WINDOW_SERVICE)); the notification bar will able to drag.. – Jasper Jye Apr 11 '16 at 03:36

Android removeView crashed

1 Answers1