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Today I installed latest version of Android Studio

I am learning Floating Widgets in Android

I started with applying this example

https://www.spaceotechnologies.com/android-floating-widget-tutorial/

it compiles ok

but when I run it in the emulator it crashes

giving me this error

08-28 22:52:02.932 7400-7400/com.asmgx.MyApp.MyApp E/AndroidRuntime: FATAL EXCEPTION: main Process: com.asmgx.MyApp.MyApp, PID: 7400 java.lang.RuntimeException: Unable to create service com.asmgx.MyApp.MyApp.FloatWidgetService: android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@7c93828 -- permission denied for window type 2002 at android.app.ActivityThread.handleCreateService(ActivityThread.java:3544) at android.app.ActivityThread.access$1300(ActivityThread.java:199) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1666) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6669) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) Caused by: android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@7c93828 -- permission denied for window type 2002 at android.view.ViewRootImpl.setView(ViewRootImpl.java:822) at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:356) at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93) at com.asmgx.MyApp.MyApp.FloatWidgetService.onCreate(FloatWidgetService.java:36) at android.app.ActivityThread.handleCreateService(ActivityThread.java:3532) at android.app.ActivityThread.access$1300(ActivityThread.java:199)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1666)  at android.os.Handler.dispatchMessage(Handler.java:106)  at android.os.Looper.loop(Looper.java:193)  at android.app.ActivityThread.main(ActivityThread.java:6669)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 

I tried resolving the issue and found this link

Unable to add window android.view.ViewRoot$W@44da9bc0 -- permission denied for this window type

they suggested adding this line to the manifest, which already added

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>

anyone know why am i getting this?

PS. I used emulator with Android 28 and another with android 27

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4 Answers 4

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52

This is occurring because the targetSdkVersion in the example and your targetSdkVersion are different. Use the flag TYPE_APPLICATION_OVERLAY instead of TYPE_PHONE in WindowManager.LayoutParams:

WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY
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11 Comments

how can i experiment with different flags ?
Try different flags like overlay
Try the following flags: WindowManager.LayoutParams.TYPE_SYSTEM_ALERT, TYPE_SYSTEM_OVERLAY, TYPE_ACCESSIBILITY_OVERLAY,
It crashes on all other types. is there any other way i can get it working?
You've misinterpreted the answer. Either downgrade the targetSdkVersion to 22 or keep it at 26 and change the flag to TYPE_APPLICATION_OVERLAY. Makes sense?
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24

This worked for me.. I'm sure it can be simplified, but it works perfectly otherwise.
Simply replace TYPE_PHONE with TYPE_APPLICATION_OVERLAY if (and only if) user is equal or above Oreo:

final WindowManager.LayoutParams params; if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) { params = new WindowManager.LayoutParams( WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, PixelFormat.TRANSLUCENT); } else { params = new WindowManager.LayoutParams( WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.TYPE_PHONE, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, PixelFormat.TRANSLUCENT); }

OR do this in simple way

 int LAYOUT_FLAG; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { LAYOUT_FLAG = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY; } else { LAYOUT_FLAG = WindowManager.LayoutParams.TYPE_PHONE; } final WindowManager.LayoutParams params = new WindowManager.LayoutParams( WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT, LAYOUT_FLAG, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, PixelFormat.TRANSLUCENT);
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4

By changing targetSdkVersion to 22, the issue will be solved partially. For devices above 22 you will get the same error. I found the following answer in stack overflow but didn't remember the link. You can try the following code:

private void createFloatView() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { checkDrawOverlayPermission(); } else { createView(); } } public void checkDrawOverlayPermission() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { if (!Settings.canDrawOverlays(getContext())) { Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:" + getActivity().getPackageName())); startActivityForResult(intent, CommonVariables.REQUEST_CODE); } else { createView(); } } } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == CommonVariables.REQUEST_CODE) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { if (Settings.canDrawOverlays(getContext())) { createView(); } } } } private int CommonVariables.REQUEST_CODE = 5463 & 0xffffff00
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1 Comment

This is your missing link.. stackoverflow.com/questions/32224452/…
2

Simply replace 

TYPE_PHONE,

in your code with

android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O ? TYPE_APPLICATION_OVERLAY : TYPE_PHONE,
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