【发布时间】：2020-08-17 20:55:35
【问题描述】：
我可以在我的recyclerview 中更改text 的颜色和点击我的recyclerview 的行的背景。
但我的问题是，例如点击第 2 项后，第 10 项也被选中。同样，单击第 5 项后，第 3 项也被选中。
我该如何解决这个问题？
实际上我的问题是如何更改在 Kotlin 中点击它的 recyclerview 项目的背景颜色？
我还按照this link 中的说明进行操作。但它没有正常工作！！
AllChanelAdapter.kt
class AllChanelAdapter(private val datalist:MutableList<AllChanelModel>, var clickListener: OnItemClickListener):RecyclerView.Adapter<AllChanelHolder>() {
private lateinit var context:Context
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): AllChanelHolder {
context = parent.context
return AllChanelHolder(LayoutInflater.from(context).inflate(R.layout.allchanel_singleitem,parent,false))
}
override fun getItemCount(): Int = datalist.size
override fun onBindViewHolder(holder: AllChanelHolder, position: Int) {
val data = datalist[position]
val txt_title = holder.itemView.txt_title
val txt_body = holder.itemView.txt_body
val img_chanel = holder.itemView.img_chanel
txt_title.setText(data.title)
txt_body.setText(data.body)
Glide
.with(context)
.load("...")
.centerCrop()
.into(img_chanel);
}
holder.initialize(datalist.get(position),clickListener)
}
interface OnItemClickListener {
fun onItemClick(item: AllChanelModel, position: Int, view: View)
}
AllChanelHolder.kt
class AllChanelHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
fun initialize(item:AllChanelModel,action:OnItemClickListener){
itemView.setOnClickListener {
action.onItemClick(item,adapterPosition,itemView)
}
}
}
MainPageActivity.kt
class MainPageActivity : AppCompatActivity(),OnItemClickListener {
private val datalist:MutableList<AllChanelModel> = mutableListOf()
lateinit var allchaneladapter : AllChanelAdapter
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main_page)
send_request()
allchaneladapter = AllChanelAdapter(datalist,this)
all_chanel_recycler.layoutManager = LinearLayoutManager(this)
all_chanel_recycler.adapter = allchaneladapter
}
private fun send_request(){
val url = "http://10.0.2.2:8000/getsamplejson" // localhost api
val que = Volley.newRequestQueue(this@MainPageActivity)
val req = JsonArrayRequest(Request.Method.GET,url,null,
Response.Listener {
response->
for(i in 0..response.length()-1){
var chanel_obj = response.getJSONObject(i)
datalist.add(
AllChanelModel(
chanel_obj.getString("body"),
chanel_obj.getString("title"),
chanel_obj.getString("userId")
)
)
}
allchaneladapter.notifyDataSetChanged()
}, Response.ErrorListener {
error->
Log.e("",error.message)
})
que.add(req)
}
override fun onItemClick(item: AllChanelModel, position: Int, view: View) {
view.setBackgroundColor(Color.YELLOW)
}
}
AllChanelModel.kt
data class AllChanelModel(
@SerializedName("body")
val body: String,
@SerializedName("title")
val title: String,
@SerializedName("userId")
val userId: String
)
activity_main_page.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainPageActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/all_chanel_recycler"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
allchanel_singleitem.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:id="@+id/linear_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="3"
android:orientation="vertical"
android:padding="5dp">
<TextView
android:id="@+id/txt_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="right"
android:text="TextView"
android:textColor="#000000" />
<TextView
android:id="@+id/txt_body"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center|right"
android:text="TextView"
android:textColor="#000000" />
</LinearLayout>
<ImageView
android:id="@+id/img_chanel"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_weight="1"
app:srcCompat="@mipmap/ic_launcher" />
</LinearLayout>
请帮帮我
谢谢
【问题讨论】：
标签： android android-recyclerview