ViewPager2 | View.ClickListener 未调用
ViewPager2 | View.ClickListener not called
我使用新的 android 小部件 ViewPager2 版本 1.0.0-alpha03,当我在其上设置点击侦听器时,未调用方法 onClick()。
我的活动class:
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
supportFragmentManager.beginTransaction()
.add(R.id.fragmentContent, SecondFragment.newInstance(), SecondFragment.TAG)
.addToBackStack(SecondFragment.TAG)
.commit()
}
}
我的片段:
class SecondFragment : Fragment() {
companion object {
val TAG = SecondFragment::class.java.canonicalName
fun newInstance(): SecondFragment = SecondFragment()
}
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
return inflater.inflate(R.layout.fragment_second, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
viewPager2.setOnClickListener {
Log.d("logi", "click : ")
}
}
}
我的布局xml文件:
<androidx.coordinatorlayout.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/viewPager2"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
任何假设或解决方法?
我找到了解决办法! ViewPager2
包含 RecyclerView
,我们必须将其作为 RecyclerView
使用。我创建了 RecyclerView.Adapter 并将 itemView 上的 ClickListener 设置到构造函数 RecyclerView.ViewHolder 和 VOILA!!!
在片段中:
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
viewPager2.adapter = ViewPager2Adapter {
Log.d("logi", "clicked at : $it")
}
}
RecyclerView 适配器:
class ViewPager2Adapter(private val itemClickListener: (Int) -> (Unit)) :
RecyclerView.Adapter<RecyclerView.ViewHolder>() {
val items = mutableListOf<Any>()
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder =
ItemViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.item, parent, false))
override fun getItemCount(): Int = items.size
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
// bind your items
}
private inner class ItemViewHolder(itemView: View): RecyclerView.ViewHolder(itemView) {
init {
itemView.setOnClickListener {
Log.d("logi", "Click!") // WORKS!!!
itemClickListener(adapterPosition)
}
}
}
}
另一种方法如下:
class MyAdapter(
private val items: List<Any>,
private val onItemClickListener: OnItemClickListener
) : RecyclerView.Adapter<MyAdapter.MyViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
val itemView = parent.inflate(R.layout.item_details_view_pager)
return MyViewHolder(itemView)
}
override fun getItemCount(): Int = items.size
override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
holder.imageView.apply {
setOnClickListener {
onItemClickListener.onItemClick(position)
}
...
}
}
inner class MyViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val imageView: ImageView = itemView.findViewById(R.id.some_image_view)
}
}
构造函数参数 onItemClickListener 也可以是 lambda,但它对我来说是一个简单的接口:
interface OnItemClickListener {
fun onItemClick(position: Int)
}
我使用新的 android 小部件 ViewPager2 版本 1.0.0-alpha03,当我在其上设置点击侦听器时,未调用方法 onClick()。
我的活动class:
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
supportFragmentManager.beginTransaction()
.add(R.id.fragmentContent, SecondFragment.newInstance(), SecondFragment.TAG)
.addToBackStack(SecondFragment.TAG)
.commit()
}
}
我的片段:
class SecondFragment : Fragment() {
companion object {
val TAG = SecondFragment::class.java.canonicalName
fun newInstance(): SecondFragment = SecondFragment()
}
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
return inflater.inflate(R.layout.fragment_second, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
viewPager2.setOnClickListener {
Log.d("logi", "click : ")
}
}
}
我的布局xml文件:
<androidx.coordinatorlayout.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/viewPager2"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
任何假设或解决方法?
我找到了解决办法! ViewPager2
包含 RecyclerView
,我们必须将其作为 RecyclerView
使用。我创建了 RecyclerView.Adapter 并将 itemView 上的 ClickListener 设置到构造函数 RecyclerView.ViewHolder 和 VOILA!!!
在片段中:
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
viewPager2.adapter = ViewPager2Adapter {
Log.d("logi", "clicked at : $it")
}
}
RecyclerView 适配器:
class ViewPager2Adapter(private val itemClickListener: (Int) -> (Unit)) :
RecyclerView.Adapter<RecyclerView.ViewHolder>() {
val items = mutableListOf<Any>()
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder =
ItemViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.item, parent, false))
override fun getItemCount(): Int = items.size
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
// bind your items
}
private inner class ItemViewHolder(itemView: View): RecyclerView.ViewHolder(itemView) {
init {
itemView.setOnClickListener {
Log.d("logi", "Click!") // WORKS!!!
itemClickListener(adapterPosition)
}
}
}
}
另一种方法如下:
class MyAdapter(
private val items: List<Any>,
private val onItemClickListener: OnItemClickListener
) : RecyclerView.Adapter<MyAdapter.MyViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
val itemView = parent.inflate(R.layout.item_details_view_pager)
return MyViewHolder(itemView)
}
override fun getItemCount(): Int = items.size
override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
holder.imageView.apply {
setOnClickListener {
onItemClickListener.onItemClick(position)
}
...
}
}
inner class MyViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val imageView: ImageView = itemView.findViewById(R.id.some_image_view)
}
}
构造函数参数 onItemClickListener 也可以是 lambda,但它对我来说是一个简单的接口:
interface OnItemClickListener {
fun onItemClick(position: Int)
}