Android实现简单的popupwindow提示框

private void ejectPopup() {
 
    View parent = ((ViewGroup) this.findViewById(android.R.id.content)).getChildAt(0);
    View popView = View.inflate(this, R.layout.details_share, null);
 
 
    int width = getResources().getDisplayMetrics().widthPixels;
    int height = getResources().getDisplayMetrics().heightPixels;
//    int i = height /5*2;
     popWindow = new PopupWindow(popView, width, ViewGroup.LayoutParams.WRAP_CONTENT);
    popWindow.setAnimationStyle(R.style.Search_PopupWindowAnimation);
    popWindow.setFocusable(true);
    popWindow.setOutsideTouchable(false);// 设置同意在外点击消失
    ColorDrawable dw = new ColorDrawable(0x30000000);
    popWindow.setBackgroundDrawable(dw);
    popWindow.showAtLocation(parent, Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, 0);
    popWindow.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);//被home键挡住
    //给popup中的按钮做监听
    WindowManager.LayoutParams lp = getWindow().getAttributes();
    lp.alpha = (float) 0.7; //0.0-1.0
    getWindow().setAttributes(lp);
    popWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
      @Override
      public void onDismiss() {
        WindowManager.LayoutParams lp = getWindow().getAttributes();
        lp.alpha = (float) 1; //0.0-1.0
        getWindow().setAttributes(lp);
      }
    });
}

 popWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
      @Override
      public void onDismiss() {
        WindowManager.LayoutParams lp = getWindow().getAttributes();
        lp.alpha = (float) 1; //0.0-1.0
        getWindow().setAttributes(lp);
      }
    });

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