我有一个json对象是这样的：

{
    Yg7R_: {
    fld_invoice: "Yg7R_"
    fld_order_id: "5"
        fld_orders: {
            4: {
                fld_oiid: "4"
                fld_date: "2014-03-27 00:00:00"
                fld_name: "20140327_H5epz2y4OB_IMG_20140326_020341.jpg"
                fld_loc: "../orders/oid_5/"
            }
        }
    }
    LldP_: {
    fld_invoice: "LldP_"
    fld_order_id: "7"
        fld_orders: {
            6: {
                fld_oiid: "6"
                fld_date: "2014-03-27 00:00:00"
                fld_name: "20140327_SovH7Xf3n2_IMG_20140326_020418.jpg"
                fld_loc: "../orders/oids_7/"
            }
        }
    }
    NYEO: {
        fld_invoice: "NYEO"
        fld_order_id: "24"
        fld_orders: {
            27: {
                fld_oiid: "27"
                fld_date: "2014-03-27 00:00:00"
                fld_name: "20140327_duLLsssVWA_IMG_20140326_020341.jpg"
                fld_loc: "orders/oid_24/"
            }
            28: {
                fld_oiid: "28"
                fld_date: "2014-03-27 00:00:00"
                fld_name: "20140327_F8ayA4vWrP_IMG_20140326_020405.jpg"
                fld_loc: "orders/oid_24/"
            }
            29: {
                fld_oiid: "29"
                fld_date: "2014-03-27 00:00:00"
                fld_name: "20140327_1FlYnuNbtr_IMG_20140326_020418.jpg"
                fld_loc: "orders/oid_24/"
            }
        }
    }
}

我试图这样解析：

    // result is the above json object.
    for(int i = 0; i < result.length(); i++){
    try {
        invoice = result.getJSONArray(<Some name here>); // this name is dynamic
        Log.d("invoice "+i, invoice);
    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

但是我不知道如何访问动态名称。我们如何解析这样的JSON

-注意-Ya的 所有值都带有引号，例如：“ Yg＆R_”