Android TV开发：使用RecycleView实现横向的Listview并响应点击事件的代码

本文讲述了Android TV开发：使用RecycleView实现横向的Listview并响应点击事件的代码。分享给大家供大家参考，具体如下：

1.先贴出自己的效果图(可横向滚动，并响应item点击事件)：

2.关于点击事件的实现细节

核心：使用接口回调

在adapter中自己定义了个接口，然后在onBindViewHolder中去为holder.itemView去设置相应的监听最后回调我们设置的监听。

class HomeAdapter extends RecyclerView.Adapter<HomeAdapter.MyViewHolder>
{
//...
 public interface OnItemClickLitener
 {
 void onItemClick(View view, int position);
 void onItemLongClick(View view , int position);
 }
 private OnItemClickLitener mOnItemClickLitener;
 public void setOnItemClickLitener(OnItemClickLitener mOnItemClickLitener)
 {
 this.mOnItemClickLitener = mOnItemClickLitener;
 }
 @Override
 public void onBindViewHolder(final MyViewHolder holder, final int position)
 {
 holder.tv.setText(mDatas.get(position));
 // 如果设置了回调，则设置点击事件
 if (mOnItemClickLitener != null)
 {
  holder.itemView.setOnClickListener(new OnClickListener()
  {
  @Override
  public void onClick(View v)
  {
   int pos = holder.getLayoutPosition();
   mOnItemClickLitener.onItemClick(holder.itemView, pos);
  }
  });
  holder.itemView.setOnLongClickListener(new OnLongClickListener()
  {
  @Override
  public boolean onLongClick(View v)
  {
   int pos = holder.getLayoutPosition();
   mOnItemClickLitener.onItemLongClick(holder.itemView, pos);
   return false;
  }
  });
 }
 }
//...
}

在activity设置监听，并实现接口

mAdapter.setOnItemClickLitener(new OnItemClickLitener()
 {
  @Override
  public void onItemClick(View view, int position)
  {
  Toast.makeText(HomeActivity.this, position + " click",
   Toast.LENGTH_SHORT).show();
  }
  @Override
  public void onItemLongClick(View view, int position)
  {
  Toast.makeText(HomeActivity.this, position + " long click",
   Toast.LENGTH_SHORT).show();
   mAdapter.removeData(position);
  }
 }); 

3.实现横向效果

核心：LinearLayoutManager

LinearLayoutManager linearLayoutManager = new LinearLayoutManager(mContext,LinearLayoutManager.HORIZONTAL,false);
mRecyclerView.setLayoutManager(linearLayoutManager); 

4. 让RecyclerView的子item获得焦点

mRecyclerView.setOnFocusChangeListener(new OnFocusChangeListener() {
  @Override
  public void onFocusChange(View v, boolean hasFocus) {
  if(hasFocus){
   if(mRecyclerView.getChildCount()>0){
   mRecyclerView.getChildAt(0).requestFocus();
   }
  }
  }
 });

5.代码实现：

//定义自己的布局文件
public class EasyLayout extends LinearLayout{
 private MyAdapter mAdapter;
 private RecyclerView mRecyclerView;
 private Context mContext;
 private List<String> mDatas;
 public EasyLayout(Context context) {
 super(context);
 mDatas = new ArrayList<String>();
 for (int i=0;i<20;i++){
  String str = "图片:"+i;
  mDatas.add(str);
 }
 this.setBackgroundColor(Color.parseColor("#407EAf"));
 this.mContext = context;
 this.setOrientation(VERTICAL);
 createLayout();
 }
 private void createLayout() {
 //空出上边留白
 TextView te = new TextView(mContext);
 ViewGroup.LayoutParams lp = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,160);
 this.addView(te,lp);
 mRecyclerView = new RecyclerView(mContext);
 lp = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
 this.addView(mRecyclerView,lp); 

 LinearLayoutManager linearLayoutManager = new LinearLayoutManager(mContext,LinearLayoutManager.HORIZONTAL,false);
 mRecyclerView.setLayoutManager(linearLayoutManager);
 //设置适配器
 mAdapter = new MyAdapter( mContext,mDatas);
 mRecyclerView.setAdapter(mAdapter);
 //监听点击事件
 mAdapter.setmOnItemClickLitener(new MyAdapter.OnItemClickLitener() {
  @Override
  public void onItemClick(View view, int position) {
  Toast.makeText(mContext,"点击了图片:"+position,Toast.LENGTH_SHORT).show();
  }
 }); 

 //让RecyclerView的子item获得焦点
 mRecyclerView.setOnFocusChangeListener(new OnFocusChangeListener() {
  @Override
  public void onFocusChange(View v, boolean hasFocus) {
  if(hasFocus){
   if(mRecyclerView.getChildCount()>0){
   mRecyclerView.getChildAt(0).requestFocus();
   }
  }
  }
 });
 } 

//定义适配器类
 public static class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>
 {
 private Context mContext;
 private List<String> mDatas;
 private LayoutInflater mInflater;
 private OnItemClickLitener mOnItemClickLitener;
 //定义点击事件的接口
 public interface OnItemClickLitener
 {
  void onItemClick(View view, int position);
 }
 public MyAdapter( Context mContext,List<String> datats)
 {
  this.mContext = mContext;
  this.mDatas = datats;
  mInflater = LayoutInflater.from(this.mContext);
 }
 public void setmOnItemClickLitener(OnItemClickLitener mOnItemClickLitener)
 {
  this.mOnItemClickLitener = mOnItemClickLitener;
 }
 @Override
 public int getItemCount()
 {
  return mDatas.size();
 }
 /**
  * 创建ViewHolder
  */
 @Override
 public ViewHolder onCreateViewHolder(ViewGroup parent, int i)
 {
  View view = mInflater.inflate(R.layout.easy_item,null);
  ViewHolder viewHolder = new ViewHolder(view);
  return viewHolder;
 }
 /**
  * 设置值
  */
 @Override
 public void onBindViewHolder(final ViewHolder viewHolder, final int position)
 {
  viewHolder.btn.setText(mDatas.get(position));
  viewHolder.btn.setTextSize(40);
  viewHolder.btn.setGravity(Gravity.CENTER);
  //设置回调
  if (mOnItemClickLitener != null){
  viewHolder.btn.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
   int pos = viewHolder.getLayoutPosition();
   mOnItemClickLitener.onItemClick( viewHolder.btn,pos);
   }
  });
  }
 }
 public class ViewHolder extends RecyclerView.ViewHolder //我们需要inflate的item布局需要传入
 {
  Button btn;
  public ViewHolder(View arg0)
  {
  super(arg0);
  btn = (Button) arg0.findViewById(R.id.btn);
  }
 }
 }

//在activity加载自己的布局
public class GallarRecyActivity extends AppCompatActivity {
 @Override
 protected void onCreate(@Nullable Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 EasyLayout easyLayout = new EasyLayout(this);
 setContentView(easyLayout);
 }
}

easy_item.xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="horizontal" android:layout_width="match_parent"
 android:layout_height="match_parent">
 <Button
 android:id="@+id/btn"
 android:layout_width="320dp"
 android:layout_height="430dp" />
</LinearLayout>

6.源码及apk

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