我想在不使用ToogleButton的情况下,改变按钮的颜色和文字,我设置的xml文件是这样的。
<Button
android:id="@+id/downloadButton"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="Download"
android:textAllCaps="false"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
而且我在主Activity中做了一个代码是。
override fun onDownloadClick(item: ProjectListDataModel, position: Int) {
downloadButton.setOnClickListener {
if (downloadButton.getText() == "Download") {
downloadButton.setText("Downloaded")
downloadButton.setBackgroundColor(ContextCompat.getColor(this,R.color.blue))
} else if (downloadButton.getText() == "Downloaded") {
downloadButton.setText("Download")
downloadButton.setBackgroundColor(ContextCompat.getColor(this,R.color.gray))
}
}
}
这就是领养人
class ServerProjectsRecyclerAdapter(
val list:List<ProjectListDataModel>,
var serverClickListener: ServerProjectListActivity) : RecyclerView.Adapter<ServerProjectRecyclerViewHolder>() {
interface OnProjectListClickListener {
fun onServerProjectListClick(item: ProjectListDataModel, position: Int)
fun onDownloadClick(item: ProjectListDataModel, position: Int)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ServerProjectRecyclerViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.item_cardview_server, parent, false)
return ServerProjectRecyclerViewHolder(view)
}
override fun getItemCount(): Int {
return list.count()
}
override fun onBindViewHolder(holder: ServerProjectRecyclerViewHolder, position: Int) {
holder.initialize(list.get(position), serverClickListener)
}
}
class ServerProjectRecyclerViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
fun initialize(
item: ProjectListDataModel,
action: ServerProjectListActivity
) {
itemView.projectListView.text = item.name
itemView.modifiedTimeText.text = item.modTime
//itemView.descriptionText.text = item.description
itemView.setOnClickListener {
action.onServerProjectListClick(item, adapterPosition)
}
itemView.downloadButton.setOnClickListener {
action.onDownloadClick(item, adapterPosition)
}
}
}
它似乎没有错误,但不工作.有一些例子使用java,但不是Kotlin。
下面是我想做的java教程。
https:/www.youtube.comwatch?v=OVmLLet9aAQ
有谁知道问题出在哪里?
在这里改变你的界面与此。
interface OnProjectListClickListener {
fun onServerProjectListClick(item: ProjectListDataModel, position: Int)
fun onDownloadClick(button:Button,item: ProjectListDataModel, position: Int)
}
在你的界面中更改以下内容 viewholder
阶层
itemView.downloadButton.setOnClickListener {
action.onDownloadClick(it,item, adapterPosition)
}
最后在你的活动中做如下操作。
override fun onDownloadClick(button:Button,item: ProjectListDataModel, position: Int) {
if (button.getText() == "Download") {
button.setText("Downloaded")
button.setBackgroundColor(ContextCompat.getColor(this,R.color.blue))
} else if (button.getText() == "Downloaded") {
button.setText("Download")
button.setBackgroundColor(ContextCompat.getColor(this,R.color.gray))
}
}
android:backgroundTint="@android:color/white"
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_server_project_list)
downloadButton?.setOnClickListener {
if (downloadButton.getText() == "Download") {
downloadButton.setText("Downloaded")
downloadButton.setBackgroundTint(android.R.color.black)
} else if (downloadButton.getText() == "Downloaded") {
downloadButton.setText("Download")
downloadButton.setBackgroundTint(android.R.color.holo_red_dark)
}
}
}