最近TV项目开发都是使用的kotlin，于是总结了一下,直接上代码：
1.初始化变量:
(1)java写法:
private MyRecycleViewAdapter adapter;
private RecyclerView recyclerView, rvGameList,rvTimeList;
//标题
private String[] titles = {"首页", "游戏", "教育", "生活", "娱乐", "新闻", "直播", "我的"};
private GameListAdapter gameListAdapter;
private List<GameListBean> gameListBeans;
（2）Kotlin写法:
private var adapter: MyRecyclerViewAdapter? = null
//标题
private val titles =
arrayOf("首页", "游戏", "教育", "生活", "娱乐", "新闻", "直播", "我的")
private var gameListAdapter: GameListAdapter? = null
private var gameListBeans: MutableList<GameListBean>? = null
2.初始化标题适配器:
（2-1）java写法:
/**
* 初始化Adapter
*/
private void initAdapter() {
adapter = new MyRecycleViewAdapter(this, titles);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setAdapter(adapter);
recyclerView.requestFocus();
adapter.setOnFocusChangeListener(this);
adapter.setOnItemClickListener(this);
}
(2-2)Kotlin写法:
/**
* 初始化标题
*/
private fun initAdapter() {
adapter = MyRecyclerViewAdapter(this)
rv_tab!!.layoutManager = LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false)
rv_tab!!.adapter = adapter
rv_tab!!.requestFocus()
adapter!!.setData(titles)
adapter!!.setOnFocusChangeListener(this)
adapter!!.setOnItemClickListener(this)
}
3.初始化内容列表:
(3-1)java写法：
private void initTimeAdapter() {
setData();
gameListAdapter = new GameListAdapter(gameListBeans, this, new GameListAdapter.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
}
}) {
@Override
protected void onItemFocus(View itemView) {
itemView.setSelected(true);
View view = itemView.findViewById(R.id.iv_bg);
view.setSelected(true);
}
@Override
protected void onItemGetNormal(View itemView) {
itemView.setSelected(true);
View view = itemView.findViewById(R.id.iv_bg);
view.setSelected(true);
}
};
rvTimeList.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false));
rvTimeList.addItemDecoration(new SpaceDecoration(30));
rvTimeList.setAdapter(gameListAdapter);
}
（3-2）kotlin写法:
/**
* 初始化内容列表
*/
private fun initTimeAdapter() {
setData()
gameListAdapter =
object : GameListAdapter(gameListBeans, this, object : OnItemClickListener {
override fun onItemClick(view: View?, position: Int) {}
}) {
override fun onItemFocus(itemView: View?) {
itemView?.isSelected = true
val view: View = itemView!!.findViewById(R.id.iv_bg)
view.isSelected = true
}
override fun onItemGetNormal(itemView: View?) {
itemView?.isSelected = true
val view: View = itemView!!.findViewById(R.id.iv_bg)
view.isSelected = true
}
}
rv_time_list.layoutManager =
LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false)
rv_time_list.addItemDecoration(SpaceDecoration(30))
rv_time_list.adapter = gameListAdapter
}
4.初始化数据:
(4-1)java写法：
private void setData() {
gameListBeans = new ArrayList<>();
for (int i = 0; i < 15; i++) {
GameListBean gameListBean = new GameListBean();
gameListBean.setGameName("王者荣耀");
gameListBean.setImg("2");
gameListBeans.add(gameListBean);
}
}
(4-2)kotlin写法：
/**
* 初始化数据
*/
private fun setData() {
gameListBeans = ArrayList()
for (i in 0..14) {
val gameListBean = GameListBean("2", "王者荣耀")
(gameListBeans as ArrayList<GameListBean>).add(gameListBean)
}
}
5.点击标题item刷新数据：
（5-1）java写法：
@Override
public void onItemClick(View view, int position) {
updateData(titles[position]);
}
private void updateData(String title) {
if (gameListBeans != null && gameListBeans.size() > 0) {
gameListBeans.clear();
}
for (int i = 0; i < 15; i++) {
GameListBean gameListBean = new GameListBean();
gameListBean.setGameName(title);
gameListBean.setImg("2");
gameListBeans.add(gameListBean);
}
gameListAdapter.notifyDataSetChanged();
}
（5-2）kotlin写法：
override fun onItemClick(view: View?, position: Int) {
updateData(titles[position])
}
/**
* 更新数据，这里是模拟数据，真实的项目是请求接口刷新数据
*/
private fun updateData(title: String) {
if (gameListBeans != null && gameListBeans!!.size > 0) {
gameListBeans!!.clear()
}
for (i in 0..14) {
val gameListBean = GameListBean("1", title)
gameListBeans!!.add(gameListBean)
}
gameListAdapter!!.notifyDataSetChanged()
}
6.activity_main布局代码：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorPrimary"
android:orientation="vertical"
tools:context=".MainActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv_tab"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:focusable="true" />
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.example.tvrecyclerviewkotlin.view.DrawBorderGridLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="100dp"
android:background="@drawable/text_selector"
android:focusable="true"
android:gravity="center"
android:text="芒果TV"
android:textSize="36sp" />
<TextView
android:layout_width="130dp"
android:layout_height="60dp"
android:layout_marginLeft="10dp"
android:background="@drawable/text_selector"
android:focusable="true"
android:gravity="center"
android:text="小米TV"
android:textSize="36sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="170dp"
android:layout_marginTop="30dp"
android:background="@drawable/text_selector"
android:clickable="true"
android:focusable="true"
android:focusableInTouchMode="true"
android:gravity="center"
android:text="极米TV"
android:textSize="44sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="90dp"
android:layout_marginLeft="15dp"
android:background="@drawable/text_selector"
android:clickable="true"
android:focusable="true"
android:focusableInTouchMode="true"
android:gravity="center"
android:text="腾讯TV"
android:textSize="36sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="92dp"
android:layout_marginLeft="30dp"
android:layout_marginTop="35dp"
android:background="@drawable/text_selector"
android:focusable="true"
android:focusableInTouchMode="true"
android:gravity="center"
android:text="魔百盒"
android:textSize="40sp" />
<TextView
android:layout_width="140dp"
android:layout_height="119dp"
android:layout_marginLeft="38dp"
android:background="@drawable/text_selector"
android:clickable="true"
android:focusable="true"
android:focusableInTouchMode="true"
android:gravity="center"
android:text="PPTV"
android:textSize="44sp" />
</com.example.tvrecyclerviewkotlin.view.DrawBorderGridLayout>
</HorizontalScrollView>
<com.example.tvrecyclerviewkotlin.view.FocusRecyclerView
android:id="@+id/rv_time_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:clipChildren="false"
android:focusable="true" />
</LinearLayout>
7.最后实现的效果如下：
8.可以发现Kotlin写法简洁很多，当然你如果对java比较熟悉，公司没有强行要求一定要用kotlin,你可以还是用java.个人建议可以业余学习一下kotlin不喜勿喷，毕竟Google官方文档和项目已经逐步转换为kotlin,如果不学习的话，后面看官方文档和项目都比较吃力，毕竟技不压身，多学习一个技能比较好~~
最后放上demo源码地址:TVRecyclerViewKotlin: Kotlin版TV开发