这是我的JSON:
{
"cats": [
{
"id": "2",
"uid": "2",
"name": "English",
"date_update": "2019-04-22 15:31:00",
"numCards": 0
}
]
}
我有这两个类:
data class CatModelStr(
val cats: List<Cat>
)
data class Cat(
val date_update: String,
val id: String,
val name: String,
val numCards: Int,
val uid: String
)
我正在使用MVVM和android架构组件。这是我获取数据的模型类:
class CategoryModel(private val netManager: NetManager) {
var dateChanges: String = "null";
fun getCats(): MutableLiveData<MutableList<CatModelStr>> {
var list = MutableLiveData<MutableList<CatModelStr>>();
if (netManager.isConnected!!) {
list = getCatsOnline();
}
return list
}
private fun getCatsOnline(): MutableLiveData<MutableList<CatModelStr>> {
var list:MutableLiveData<MutableList<CatModelStr>> =MutableLiveData()
val getCats = ApiConnection.client.create(Category::class.java)
getCats.getCats(MyApp().uid, dateChanges)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(
{ success ->
list += success
},{
error->
Log.v("this","ErrorGetCats "+ error.localizedMessage);
}
)
return list;
}
operator fun <T> MutableLiveData<MutableList<T>>.plusAssign(values: List<T>) {
val value = this.value ?: arrayListOf()
value.addAll(values)
this.value = value
}
我有一个viewModel和活动来获取数据,它工作正常。问题是这样,我想从我的MutableLiveData中获取cat值(cat内的json属性)。
这是我的活动代码:
vm.getCats().observe(this, Observer {
if(it!=null) {
rc_cats.visibility= View.VISIBLE
pb.visibility=View.GONE
catAdapter.reloadData(it)
}
})
价值是MutableList<CatModelStr>
,我需要Cat。
我怎样才能让Cat离开MutableList?
我得到的是你不需要MutableList
列表,而你需要CatModelStr
你需要从开始我做出以下更改。
class CategoryModel(private val netManager: NetManager) {
var dateChanges: String = "null";
fun getCats(): MutableLiveData<CatModelStr> {
var list = MutableLiveData<CatModelStr>();
if (netManager.isConnected!!) {
list = getCatsOnline();
}
return list
}
private fun getCatsOnline(): MutableLiveData<CatModelStr> {
var list:MutableLiveData<CatModelStr> = MutableLiveData()
val getCats = ApiConnection.client.create(Category::class.java)
getCats.getCats(MyApp().uid, dateChanges)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(
{ success ->
list.setValue(success)
},{
error->
Log.v("this","ErrorGetCats "+ error.localizedMessage);
list.setValue(null)
}
)
return list;
}
现在,如果观察到这一点,你将获得CatModelStr
而不是MutableList
,原因是你的JSON
以CatModelStr格式给你数据,你试图在MutableList中不必要地获取它,这也无法工作,你无法解析你的JSON给定格式。