android targetSdkVersion / alertdialog pop error when running on 6.0+

while pop up one alert dialog in service, for sdk <=19, only required permission in manifest

then set dialog dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);

is success.

but for sdk > 23 android 6.0 ++ , it failed.

we need require permission when your app first time run, then reply permissoin

if (!Settings.canDrawOverlays(this)) {                                Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,                        Uri.parse("package:" + getPackageName()));                this.startActivity(intent);                dialogConnectLost.getWindow().setType(WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY);} else {                  dialogConnectLost.getWindow().setType(WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY);}

BUT , another way to fix that is keep your targetSdkVersion <23, it will work as on sdk below 23. and

you just keep old code no need change.

no matter your buid sdk of project is >23 or not.

this is what targetSdkVersion 's magic effect.

included: build sdk >= 23 , then app could run on android 6.0++, keep target sdk < 23, then app could run like old sdk.

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