RecyclerView 将 MaterialToggleButtonGroup 添加到父 LinearLayoutManager
RecyclerView add MaterialToggleButtonGroup to parent LinearLayoutManager
我想制作一个水平 RecyclerView
,使用其布局 LinearLayoutManager
。我想实现这样的东西:
如您所见,需要 ToggleButtons
或正常的 MaterialButtons
。为了让 ToggleButtons
在 LinearLayoutManager
中正常运行,我需要添加 MaterialButtonToggleGroup
作为子 ViewGroup
,这将是 ToggleButtons
我要添加的父级使用自定义适配器。
当我尝试将 MaterialToggleButtonGroup
添加到 LinearLayoutManager
时,它给了我一个错误(我想它会,我的建议我知道是不正确的)。有什么想法吗?
你可以通过这样做来实现这个布局
这是代码
自定义适配器
class ItemAdapter(context: Context):RecyclerView.Adapter<ItemAdapter.ViewHolder>() {
private lateinit var mainView: View
private var mSelectedIndex = -1
private val list: Array<String> = context.resources.getStringArray(R.array.item_names)
class ViewHolder(mainView: View):RecyclerView.ViewHolder(mainView) {
val itemName: TextView = mainView.findViewById(R.id.textView)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
mainView = LayoutInflater.from(parent.context).inflate(R.layout.item_list,parent,false)
return ViewHolder(mainView)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.itemName.text = list[position]
holder.itemName.setOnClickListener {
mSelectedIndex = position
notifyDataSetChanged()
}
if (mSelectedIndex == position){
holder.itemName.setBackgroundResource(R.drawable.rectangle_black)
holder.itemName.setTextColor(Color.WHITE)
}else{
holder.itemName.setBackgroundResource(R.drawable.rectangle)
holder.itemName.setTextColor(Color.BLACK)
}
}
override fun getItemCount(): Int {
return list.size
}
}
Activity
中的 Recycler 视图实现
class MainActivity : AppCompatActivity() {
private lateinit var mHorizontalRecyclerView: RecyclerView
private lateinit var mAdapter: ItemAdapter
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
mHorizontalRecyclerView = findViewById(R.id.rv_items_list)
mAdapter = ItemAdapter(this)
val manager = LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false)
mHorizontalRecyclerView.adapter = mAdapter
mHorizontalRecyclerView.layoutManager = manager
}
}
列表项布局
<?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="wrap_content"
android:layout_height="wrap_content">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:background="@drawable/rectangle"
android:gravity="center"
android:text="Popular"
android:padding="20dp"
android:textColor="@color/black"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
未选择自定义 TextView 背景
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="40dp"/>
<solid android:color="@color/white"/>
已选择自定义 TextView 背景
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="40dp"/>
<solid android:color="@color/white"/>
我想制作一个水平 RecyclerView
,使用其布局 LinearLayoutManager
。我想实现这样的东西:
如您所见,需要 ToggleButtons
或正常的 MaterialButtons
。为了让 ToggleButtons
在 LinearLayoutManager
中正常运行,我需要添加 MaterialButtonToggleGroup
作为子 ViewGroup
,这将是 ToggleButtons
我要添加的父级使用自定义适配器。
当我尝试将 MaterialToggleButtonGroup
添加到 LinearLayoutManager
时,它给了我一个错误(我想它会,我的建议我知道是不正确的)。有什么想法吗?
你可以通过这样做来实现这个布局 这是代码
自定义适配器
class ItemAdapter(context: Context):RecyclerView.Adapter<ItemAdapter.ViewHolder>() {
private lateinit var mainView: View
private var mSelectedIndex = -1
private val list: Array<String> = context.resources.getStringArray(R.array.item_names)
class ViewHolder(mainView: View):RecyclerView.ViewHolder(mainView) {
val itemName: TextView = mainView.findViewById(R.id.textView)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
mainView = LayoutInflater.from(parent.context).inflate(R.layout.item_list,parent,false)
return ViewHolder(mainView)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.itemName.text = list[position]
holder.itemName.setOnClickListener {
mSelectedIndex = position
notifyDataSetChanged()
}
if (mSelectedIndex == position){
holder.itemName.setBackgroundResource(R.drawable.rectangle_black)
holder.itemName.setTextColor(Color.WHITE)
}else{
holder.itemName.setBackgroundResource(R.drawable.rectangle)
holder.itemName.setTextColor(Color.BLACK)
}
}
override fun getItemCount(): Int {
return list.size
}
}
Activity
中的 Recycler 视图实现class MainActivity : AppCompatActivity() {
private lateinit var mHorizontalRecyclerView: RecyclerView
private lateinit var mAdapter: ItemAdapter
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
mHorizontalRecyclerView = findViewById(R.id.rv_items_list)
mAdapter = ItemAdapter(this)
val manager = LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false)
mHorizontalRecyclerView.adapter = mAdapter
mHorizontalRecyclerView.layoutManager = manager
}
}
列表项布局
<?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="wrap_content"
android:layout_height="wrap_content">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:background="@drawable/rectangle"
android:gravity="center"
android:text="Popular"
android:padding="20dp"
android:textColor="@color/black"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
未选择自定义 TextView 背景
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="40dp"/>
<solid android:color="@color/white"/>
已选择自定义 TextView 背景
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="40dp"/>
<solid android:color="@color/white"/>