Android 回收器视图未在kotlin中显示JSON数据
这是我的主课,我将使用截击在ArrayList中添加JASON数据。 Toast显示JASON数据,但数组不显示任何数据。我正在努力解决过去三天的错误。 我也读了很多关于stack的问题,但我对此没有解决方案,请帮助我Android 回收器视图未在kotlin中显示JSON数据,android,json,kotlin,android-recyclerview,android-volley,Android,Json,Kotlin,Android Recyclerview,Android Volley,这是我的主课,我将使用截击在ArrayList中添加JASON数据。 Toast显示JASON数据,但数组不显示任何数据。我正在努力解决过去三天的错误。 我也读了很多关于stack的问题,但我对此没有解决方案,请帮助我 var item = ArrayList<dumy_item_list>() var url = "https://apps.faizeqamar.website/charity/api/organizations"
var item = ArrayList<dumy_item_list>()
var url = "https://apps.faizeqamar.website/charity/api/organizations"
var rq: RequestQueue = Volley.newRequestQueue(this)
var sr = StringRequest(Request.Method.GET, url, Response.Listener { response ->
var jsonResponse = JSONObject(response)
var jsonArray: JSONArray = jsonResponse.getJSONArray("data")
for (i in 0..jsonArray.length() - 1) {
var jsonObject: JSONObject = jsonArray.getJSONObject(i)
var name = jsonObject.getString("name")
val data = dumy_item_list()
data.setName(jsonObject.getString(name))
item.add(data)
Toast.makeText(applicationContext, "NGO Name is : $name", Toast.LENGTH_LONG).show()
}
},
Response.ErrorListener { error ->
Toast.makeText(applicationContext, error.message, Toast.LENGTH_LONG).show()
})
rq.add(sr)
var away_recycler = findViewById<RecyclerView>(R.id.away_recycler)
var adaptor = custom_adopter(item, applicationContext)
away_recycler.layoutManager = GridLayoutManager(applicationContext, 1)
away_recycler.adapter = adaptor
}
var item=ArrayList()
变量url=”https://apps.faizeqamar.website/charity/api/organizations"
var rq:RequestQueue=Volley.newRequestQueue(此)
var sr=StringRequest(Request.Method.GET、url、Response.Listener{Response->
var jsonResponse=JSONObject(响应)
var jsonArray:jsonArray=jsonResponse.getJSONArray(“数据”)
对于(i in 0..jsonArray.length()-1){
var jsonObject:jsonObject=jsonArray.getJSONObject(i)
var name=jsonObject.getString(“名称”)
val data=dumy_项目清单()
data.setName(jsonObject.getString(name))
项目.添加(数据)
Toast.makeText(applicationContext,“NGO名称为:$Name”,Toast.LENGTH\u LONG.show())
}
},
Response.ErrorListener{error->
Toast.makeText(applicationContext,error.message,Toast.LENGTH\u LONG.show())
})
rq.add(sr)
var away\u recycler=findViewById(R.id.away\u recycler)
var适配器=自定义应用程序(项目,applicationContext)
away\u recycler.layoutManager=GridLayoutManager(applicationContext,1)
away\u recycler.adapter=适配器
}
这是我使用getName()函数的适配器类
class custom_adopter(data: ArrayList<dumy_item_list>, var context: Context) :
RecyclerView.Adapter<custom_adopter.viewHolder>() {
var data: List<dumy_item_list>
init {
this.data = data
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): custom_adopter.viewHolder {
var layout = LayoutInflater.from(context).inflate(R.layout.dumy_item, parent, false)
return viewHolder(layout)
}
override fun onBindViewHolder(holder: custom_adopter.viewHolder, position: Int) {
holder.tv_dummy_name_donnor.text = data[position].getName()
holder.card.setOnClickListener {
var intent = Intent(context, ngosProfile::class.java)
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
startActivity(context, intent, null)
}
}
override fun getItemCount(): Int {
return data.size
}
class viewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
internal var tv_dummy_name_donnor: TextView
internal var card: CardView
init {
tv_dummy_name_donnor = itemView.findViewById(R.id.tv_dummy_name_donnor)
card = itemView.findViewById(R.id.card)
}
}
}
类自定义采纳器(数据:ArrayList,变量上下文:context):
RecyclerView.Adapter(){
var数据:列表
初始化{
this.data=数据
}
override fun onCreateViewHolder(父级:ViewGroup,viewType:Int):custom_adopter.viewHolder{
var layout=LayoutInflater.from(上下文)。充气(R.layout.dumy_项,父项,false)
返回视图保持器(布局)
}
覆盖BindViewHolder(holder:custom_adopter.viewHolder,位置:Int){
holder.tv\u dummy\u name\u donnor.text=data[position].getName()
holder.card.setOnClickListener{
var intent=intent(上下文,ngosProfile::class.java)
intent.flags=intent.FLAG\u活动\u新任务
startActivity(上下文、意图、空)
}
}
重写getItemCount():Int{
返回数据大小
}
类viewHolder(itemView:View):RecyclerView.viewHolder(itemView){
内部变量tv\u虚拟\u名称\u donnor:TextView
内部var卡:CardView
初始化{
tv\u dummy\u name\u donnor=itemView.findViewById(R.id.tv\u dummy\u name\u donnor)
card=itemView.findViewById(R.id.card)
}
}
}
我猜您的RecyclerView中包含所有项目,但它们是空的
因此,问题应该是您在哪里填写适配器列表..在下面这一行:
data.setName(jsonObject.getString(name))
一定是这样的
data.setName(name)
或
我猜你有一个包含所有项目的RecyclerView,但它们是空的 因此,问题应该是您在哪里填写适配器列表..在下面这一行:
data.setName(jsonObject.getString(name))
一定是这样的
data.setName(name)
或
在将数据加载到列表中后,您应该调用适配器的notifyDataSetChanged方法,以通知有新数据。在将数据加载到列表中后,您应该调用适配器的notifyDataSetChanged方法,以通知有新数据。遵循此代码,这对我来说很有用<代码>(var适配器=自定义采纳器(项目,应用上下文)
away\u recycler.adapter=适配器
progressBar2?.visibility=View.INVISIBLE)
在循环后将值签名给适配器
class MainActivity : AppCompatActivity() {
var progressBar2:ProgressBar?=null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var item = ArrayList<dumy_item_list>()
var progressBar2 = findViewById<ProgressBar>(R.id.progressBar2)
var away_recycler = findViewById<RecyclerView>(R.id.away_recycler)
away_recycler.layoutManager = GridLayoutManager(applicationContext, 1)
var url = "https://apps.faizeqamar.website/charity/api/organizations"
var rq: RequestQueue = Volley.newRequestQueue(this)
var sr = StringRequest(Request.Method.GET, url, Response.Listener { response ->
var jsonResponse = JSONObject(response)
var jsonArray: JSONArray = jsonResponse.getJSONArray("data")
for (i in 0..jsonArray.length() - 1) {
var jsonObject: JSONObject = jsonArray.getJSONObject(i)
var name = jsonObject.getString("ngo_name")
var about = jsonObject.getString("ngo_desc")
item.add(dumy_item_list(name,about))
}
var adaptor = custom_adopter(item, applicationContext)
away_recycler.adapter = adaptor
progressBar2?.visibility = View.INVISIBLE
},
Response.ErrorListener { error ->
})
rq.add(sr)
}
class MainActivity:AppCompatActivity(){
变量progressBar2:ProgressBar?=null
重写创建时的乐趣(savedInstanceState:Bundle?){
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var item=ArrayList()
var progressBar2=findViewById(R.id.progressBar2)
var away\u recycler=findViewById(R.id.away\u recycler)
away\u recycler.layoutManager=GridLayoutManager(applicationContext,1)
变量url=”https://apps.faizeqamar.website/charity/api/organizations"
var rq:RequestQueue=Volley.newRequestQueue(此)
var sr=StringRequest(Request.Method.GET、url、Response.Listener{Response->
var jsonResponse=JSONObject(响应)
var jsonArray:jsonArray=jsonResponse.getJSONArray(“数据”)
对于(i in 0..jsonArray.length()-1){
var jsonObject:jsonObject=jsonArray.getJSONObject(i)
var name=jsonObject.getString(“ngo_名称”)
var about=jsonObject.getString(“ngo_desc”)
添加(dumy_项目列表(名称,关于))
}
var适配器=自定义应用程序(项目,applicationContext)
away\u recycler.adapter=适配器
progressBar2?可见性=视图不可见
},
Response.ErrorListener{error->
})
rq.add(sr)
}
遵循此代码为我完成此工作。(var adapter=custom\u adopter(item,applicationContext)
away\u recycler.adapter=adapter
progressBar2?.visibility=View.INVISIBLE)
在循环后将值签名给adapter
class MainActivity : AppCompatActivity() {
var progressBar2:ProgressBar?=null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var item = ArrayList<dumy_item_list>()
var progressBar2 = findViewById<ProgressBar>(R.id.progressBar2)
var away_recycler = findViewById<RecyclerView>(R.id.away_recycler)
away_recycler.layoutManager = GridLayoutManager(applicationContext, 1)
var url = "https://apps.faizeqamar.website/charity/api/organizations"
var rq: RequestQueue = Volley.newRequestQueue(this)
var sr = StringRequest(Request.Method.GET, url, Response.Listener { response ->
var jsonResponse = JSONObject(response)
var jsonArray: JSONArray = jsonResponse.getJSONArray("data")
for (i in 0..jsonArray.length() - 1) {
var jsonObject: JSONObject = jsonArray.getJSONObject(i)
var name = jsonObject.getString("ngo_name")
var about = jsonObject.getString("ngo_desc")
item.add(dumy_item_list(name,about))
}
var adaptor = custom_adopter(item, applicationContext)
away_recycler.adapter = adaptor
progressBar2?.visibility = View.INVISIBLE
},
Response.ErrorListener { error ->
})
rq.add(sr)
}
class MainActivity:AppCompatActivity(){
变量progressBar2:ProgressBar?=null
重写创建时的乐趣(savedInstanceState:Bundle?){
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var item=ArrayList()
var progressBar2=findViewById(R.id.progressBar2)
var away\u recycler=findViewById(R.id.away\u recycler)
away\u recycler.layoutManager=GridLayoutManager(a