private void share(String content, Uri uri){

        Intent shareIntent = new Intent(Intent.ACTION_SEND);

        if(uri!=null){

            shareIntent.putExtra(Intent.EXTRA_STREAM, uri);

            shareIntent.setType("image/*");

            //当用户选择短信时使用sms_body取得文字

            shareIntent.putExtra("sms_body", content);

        }else{

            shareIntent.setType("text/plain");

        }

        shareIntent.putExtra(Intent.EXTRA_TEXT, content);

        //自定义选择框的标题

        //startActivity(Intent.createChooser(shareIntent, "邀请好友"));

        //系统默认标题

        startActivity(shareIntent);

    }