Android permission denied for window type 2002

ACTION_MANAGE_OVERLAY_PERMISSION

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if(!Settings.canDrawOverlays(getApplicationContext())) {
//启动Activity让用户授权
Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
intent.setData(Uri.parse("package:" + getPackageName()));
startActivityForResult(intent,100);
}
}
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == 100){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (Settings.canDrawOverlays(this)) {
WindowManager windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
WindowManager.LayoutParams params = new WindowManager.LayoutParams();
params.type = WindowManager.LayoutParams.TYPE_PHONE;
params.format = PixelFormat.RGBA_8888;
windowManager.addView(view,params);
}else {
Toast.makeText(this,"ACTION_MANAGE_OVERLAY_PERMISSION权限已被拒绝",Toast.LENGTH_SHORT).show();;
}
}

}