@Override
public void onAttachedToWindow() {
super.onAttachedToWindow();
//该方法黑屏
//this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
//该方法背景透明
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
}原文地址:http://blog.csdn.net/u014600432/article/details/42638313