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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