/**

    * @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

  }