Android判读是否安装了某一款ＡＰＰ

    /**
    * @Title: isAvilible
    * @Description: 断手机已安装某程序
    * @param @param context
    * @param @param packageName
    * @param @return
    * @return boolean
    * @throws
     */
    public static boolean isAviliblePackage(Context context, String packageName){
        final PackageManager packageManager = context.getPackageManager();//获取packagemanager
        List<PackageInfo> pinfo = packageManager.getInstalledPackages(0);//获取所有已安装程序的包信息
        List<String> pName = new ArrayList<String>();//用于存储所有已安装程序的包名
       //从pinfo中将包名字逐一取出，压入pName list中
        if(pinfo != null){
            for(int i = 0; i < pinfo.size(); i++){
                String pn = pinfo.get(i).packageName;
                pName.add(pn);
            }
        }
        return pName.contains(packageName);//判断pName中是否有目标程序的包名，有TRUE，没有FALSE
  }