Android 如何在Firebase中迭代嵌套Json

我想使用firebase的这个嵌套URL，在这里我必须将

range

键发送到下一个活动。range键可能有多个项目。但是我不明白如何将嵌套URL与

addChildEventListener（）一起使用

它从产品密钥开始，您需要为此使用valueventlistener
{
item1: { details: "5x shirts Washed,Ironed and Hunged", 
         name: "High Five",
         oldprice: 71,
         price: 23,
         product: {range: {
                     item1: {
                     details: "5x shirts,washed, Ironed and Hunged",
                     name: "High Five",
                     price : 2.6
                            }
                          },
         title: "We're specialists at caring for a wide range of shirt  styles,including formal dress shirts and laid-back styles"
                  }
       }
item2: { name: "Shirts",
         price: 45
       },
item3: {
         name: "Blouses",
         price: 6
       },
item4: {
         name: "t-Shirts",
         price: 34
       }
}