代码设置Dialog全屏且透明

在代码中设置dialog全屏且透明的方法：

public class MyDialogextends Dialog{

public MyDialog (Context context) {
    super(context,android.R.style. Theme);  //在这需要设置个系统的theme替换dialog默认的主题，不设置下面的window设置都无效
    setOwnerActivity((Activity)(context));
    Window window = getWindow();
    requestWindowFeature(Window. FEATURE_NO_TITLE);  //去掉dialog的title
    window.addFlags(WindowManager.LayoutParams. FLAG_FULLSCREEN);  //全屏的flag
    window.setBackgroundDrawableResource(android.R.color.transparent); //设置window背景透明
    WindowManager.LayoutParams lp = window.getAttributes();
    lp.alpha = 1.0f;
    lp.dimAmount = 0.0f; //dimAmount在0.0f和1.0f之间，0.0f完全不暗，1.0f全暗
    window.setAttributes(lp);
    this.setCancelable( false);
}

public void show(FlashAd flashAd){
    this.setContentView(flashAd);
    this.show();
}

}