为什么我的overlay没有显示(Android)？

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

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && !Settings.canDrawOverlays(context)) {
    Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
            Uri.parse("package:" + context.getPackageName()));
    startActivityForResult(intent, REQUEST_CODE);
}

Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
        Uri.parse("package:" + context.getPackageName()));
startActivityForResult(intent, REQUEST_CODE);

WindowManager.LayoutParams params = new WindowManager.LayoutParams(
        WindowManager.LayoutParams.WRAP_CONTENT,
        WindowManager.LayoutParams.WRAP_CONTENT,
        WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
        WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
        PixelFormat.TRANSLUCENT);
        
WindowManager windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
windowManager.addView(yourOverlayView, params);