在Android中使用PopupWindow实现一个弹出分享功能

在Android中使用PopupWindow实现一个弹出分享功能？很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。

代码

package com.duanlian.popupwindowdemo;  import android.app.Activity; import android.content.Context; import android.graphics.drawable.ColorDrawable; import android.view.LayoutInflater; import android.view.View; import android.view.WindowManager; import android.widget.LinearLayout; import android.widget.PopupWindow; import android.widget.TextView;    public class RewritePopwindow extends PopupWindow {   private View mView;    public RewritePopwindow(Activity context, View.OnClickListener itemsOnClick) {     super(context);     initView(context, itemsOnClick);   }    private void initView(final Activity context, View.OnClickListener itemsOnClick) {     LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);     mView = mInflater.inflate(R.layout.popupwindow_share, null);     LinearLayout weiXFriend = (LinearLayout) mView.findViewById(R.id.weixinghaoyou);     LinearLayout friendster = (LinearLayout) mView.findViewById(R.id.pengyouquan);     LinearLayout QQFriend = (LinearLayout) mView.findViewById(R.id.qqhaoyou);     LinearLayout QQZone = (LinearLayout) mView.findViewById(R.id.qqkongjian);     TextView canaleTv = (TextView) mView.findViewById(R.id.share_cancle);     canaleTv.setOnClickListener(new View.OnClickListener() {       @Override       public void onClick(View v) {          //销毁弹出框         dismiss();         backgroundAlpha(context, 1f);       }     });     //设置按钮监听     weiXFriend.setOnClickListener(itemsOnClick);     friendster.setOnClickListener(itemsOnClick);     QQFriend.setOnClickListener(itemsOnClick);     QQZone.setOnClickListener(itemsOnClick);     //设置SelectPicPopupWindow的View     this.setContentView(mView);     //设置SelectPicPopupWindow弹出窗体的宽     this.setWidth(WindowManager.LayoutParams.FILL_PARENT);     //设置SelectPicPopupWindow弹出窗体的高     this.setHeight(WindowManager.LayoutParams.WRAP_CONTENT);     //设置SelectPicPopupWindow弹出窗体可点击     this.setFocusable(true);     //设置PopupWindow可触摸     this.setTouchable(true);     //设置非PopupWindow区域是否可触摸 //    this.setOutsideTouchable(false);     //设置SelectPicPopupWindow弹出窗体动画效果 //    this.setAnimationStyle(R.style.select_anim);     //实例化一个ColorDrawable颜色为半透明     ColorDrawable dw = new ColorDrawable(0x00000000);     //设置SelectPicPopupWindow弹出窗体的背景     this.setBackgroundDrawable(dw);     backgroundAlpha(context, 0.5f);//0.0-1.0     this.setOnDismissListener(new OnDismissListener() {        @Override       public void onDismiss() {         // TODO Auto-generated method stub         backgroundAlpha(context, 1f);       }     });   }        public void backgroundAlpha(Activity context, float bgAlpha) {     WindowManager.LayoutParams lp = context.getWindow().getAttributes();     lp.alpha = bgAlpha;     context.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);     context.getWindow().setAttributes(lp);   }  }