Android PopupWindow弹出窗口的完美实现（实现弹出背景变暗效果）

最近尝试使用popupWindow实现背景变暗效果，自己优化了一下，并封装成一个可以调用的方法，默认实现弹出窗口显示在传入view的下方，以下代码有详细注释，有问题可以留言

展示效果如下：

代码展示

布局中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="246dp"    android:layout_height="132dp"    android:layout_gravity="center"    android:gravity="center"    >  <TextView      android:id="@+id/tv_pop_web"      android:layout_width="wrap_content"      android:layout_height="32dp"      android:background="@color/nba_white"      android:clickable="true"      android:drawableLeft="@drawable/icon_pop_web"      android:drawablePadding="11dp"      android:gravity="center_vertical"      android:text="观看网页版"      android:textColor="@color/nba_black"      android:textSize="16dp"      />  <TextView      android:id="@+id/tv_pop_phone"      android:layout_width="wrap_content"      android:layout_height="32dp"      android:layout_below="@+id/tv_pop_web"      android:layout_marginTop="16dp"      android:background="@color/nba_white"      android:clickable="true"      android:drawableLeft="@drawable/icon_pop_phone"      android:drawablePadding="11dp"      android:gravity="center_vertical"      android:text="打开腾讯体育观看"      android:textColor="@color/nba_black"      android:textSize="16dp"      /></RelativeLayout>

/*  * 弹出选择直播方式的弹框  * View v ：显示在那个父view内  * int convertViewResource ：要填充到popupWindow中的布局文件id  * int drawbelResource ：int drawbelResource  * */  private void showPopWindow(View parentView, int convertViewResource, int drawbelResource,      String matchId) {    //创建一个popUpWindow    View popLayout = LayoutInflater.from(this).inflate(convertViewResource, null);    //给popUpWindow内的空间设置点击事件    popLayout.findViewById(R.id.tv_pop_web).setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View v) {        if (mPopupWindow.isShowing()) {          mPopupWindow.dismiss();        }        loadHtml(mQqSportWebUrl);      }    });    popLayout.findViewById(R.id.tv_pop_phone).setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View v) {        if (mPopupWindow.isShowing()) {          mPopupWindow.dismiss();        }        loadHtml(String.format(Api.SKIP_TO_QQSPORT_LIVE_VIDEO, matchId));      }    });    if (mPopupWindow == null) {      //实例化一个popupWindow      mPopupWindow =          new PopupWindow(popLayout, DensityUtil.dp2px(this, 246), DensityUtil.dp2px(this, 132));      //产生背景变暗效果      WindowManager.LayoutParams lp = getWindow().getAttributes();      lp.alpha = 0.4f;      getWindow().setAttributes(lp);      //点击外面popupWindow消失      mPopupWindow.setOutsideTouchable(true);      //popupWindow获取焦点      mPopupWindow.setFocusable(true);      //popupWindow设置背景图      Drawable drawable = getResources().getDrawable(drawbelResource);      mPopupWindow.setBackgroundDrawable(drawable);      //popupWindow设置开场动画风格      //popupWindow.setAnimationStyle(R.style.popupWindow_anim);      //刷新popupWindow      //popupWindow.update();      //设置popupWindow消失时的监听      mPopupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {        //在dismiss中恢复透明度        public void onDismiss() {          WindowManager.LayoutParams lp = getWindow().getAttributes();          lp.alpha = 1f;          getWindow().setAttributes(lp);        }      });      mPopupWindow.showAtLocation(parentView, Gravity.CENTER, 0, 0);    } else {      //如果popupWindow正在显示，接下来隐藏      if (mPopupWindow.isShowing()) {        mPopupWindow.dismiss();      } else {        //产生背景变暗效果        WindowManager.LayoutParams lp = getWindow().getAttributes();        lp.alpha = 0.4f;        getWindow().setAttributes(lp);        mPopupWindow.showAtLocation(parentView, Gravity.CENTER, 0, 0);      }    }  }