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hosseiniSeyRo/BaseAdapter.kt

Last active August 19, 2021 05:14
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DataBinding BaseAdapter for RecyclerView by Kotlin
Raw
activity_my.xml
<?xml version="1.0" encoding="utf-8"?>
<layout 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">
<data>
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp"
tools:context=".MyActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:listitem="@layout/row_user_item" />
</LinearLayout>
</layout>
Raw
BaseAdapter.kt
abstract class BaseAdapter<T>(private val itemClickListener: OnItemClickListener<T>) :
RecyclerView.Adapter<BaseAdapter<T>.MyViewHolder>() {
interface OnItemClickListener<T> {
fun onItemClick(item: T)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
val binding = DataBindingUtil.inflate<ViewDataBinding>(
LayoutInflater.from(parent.context),
viewType,
parent,
false
)
return MyViewHolder(binding)
}
override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
val item = getItemForPosition(position)
holder.itemView.setOnClickListener { itemClickListener.onItemClick(item) }
holder.bind(item)
}
abstract override fun getItemCount(): Int
override fun getItemViewType(position: Int): Int {
return getLayoutIdForPosition(position)
}
abstract fun getItemForPosition(position: Int): T
abstract fun getLayoutIdForPosition(position: Int): Int
inner class MyViewHolder(private val binding: ViewDataBinding) :
RecyclerView.ViewHolder(binding.root) {
fun bind(obj: T) {
binding.setVariable(BR.obj, obj)
binding.executePendingBindings()
}
}
}
Raw
MyActivity.kt
class MyActivity : BaseActivity() {
private lateinit var binding: ActivityMyBinding
private val userList = ArrayList<User>()
private lateinit var mAdapter: UserAdapter
private lateinit var recyclerView: RecyclerView
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = DataBindingUtil.setContentView(this, R.layout.activity_my)
binding.lifecycleOwner = this
setDummyData()
initRecyclerView()
}
private fun setDummyData() {
userList.addAll(
listOf(
User("tehran", "021", 28, false),
User("ali ahmadi", "sdf@dfg.rftg", 5, false),
User("rastin samsami", "tyjh@uik.dr", 8, true),
User("samad hosseini", "ty@op.df", 25, false),
User("pooyan hosseini", "trk@cfgj.thb", 33, true),
User("yalda soleimani", "prthyojrthj@dfgd.dfg", 54, false)
)
)
}
private fun initRecyclerView() {
recyclerView = binding.rv
mAdapter = UserAdapter(object : BaseAdapter.OnItemClickListener<User> {
override fun onItemClick(item: User) {
Toast.makeText(this@MyActivity, ""+item.name, Toast.LENGTH_SHORT).show()
}
})
recyclerView.layoutManager = LinearLayoutManager(this, RecyclerView.VERTICAL, false)
recyclerView.adapter = mAdapter
mAdapter.addData(userList)
}
}
Raw
row_user_item.xml
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
<data>
<variable
name="obj"
type="com.rhosseini.databindingsample.data.User" />
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="64dp"
android:clickable="true"
android:background="?attr/selectableItemBackground"
android:gravity="center_vertical"
android:orientation="horizontal"
android:padding="8dp">
<TextView
android:id="@+id/age"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
android:layout_marginStart="16dp"
android:text="@{String.valueOf(obj.age)}"
tools:text="36"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginStart="16dp"
android:orientation="vertical">
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="@style/TextAppearance.AppCompat.Medium"
android:text="@{obj.name}"
tools:text="samad samsami"/>
<TextView
android:id="@+id/email"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{obj.email}"
tools:text="zoho1381@gmail.com"/>
</LinearLayout>
</LinearLayout>
</layout>
Raw
UserAdapter.kt
class UserAdapter(itemClickListener: OnItemClickListener<User>) :
BaseAdapter<User>(itemClickListener) {
private var data: ArrayList<User> = ArrayList()
override fun getItemCount(): Int = data.size
override fun getItemForPosition(position: Int): User = data[position]
override fun getLayoutIdForPosition(position: Int): Int {
return R.layout.row_user_item
}
fun addData(data: ArrayList<User>) {
this.data.addAll(data)
notifyDataSetChanged()
}
fun updateData(data: ArrayList<User>) {
this.data = data
notifyDataSetChanged()
}
}
@jishnupd13
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is this available with diffutils library

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