Android 无法添加窗口异常

我在android 5.1中就有这个错误

 Unable to add window android.view.ViewRootImpl$W@1df76e3 -- the specified window type is not valid

代码如下：

wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    params = new WindowManager.LayoutParams(
            RelativeLayout.LayoutParams.MATCH_PARENT,
            RelativeLayout.LayoutParams.WRAP_CONTENT,
            WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED |
                    WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
            WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
            PixelFormat.TRANSPARENT);
...
 wm.addView(relativeLayout, params);

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在AndroidManifest中添加此权限

android.permission.SYSTEM_ALERT_WINDOW

---

在API>=23上，在AndroidManifest中添加此权限

android.permission.SYSTEM_ALERT_WINDOW

---

在API>=23上

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