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Android TV開發(fā):使用RecycleView實(shí)現(xiàn)橫向的Listview并響應(yīng)點(diǎn)擊事件的代碼

 更新時(shí)間:2018年05月15日 10:23:45   作者:meetings  
這篇文章主要介紹了Android TV開發(fā):使用RecycleView實(shí)現(xiàn)橫向的Listview并響應(yīng)點(diǎn)擊事件的代碼,具有很好的參考價(jià)值,希望對大家有所幫助,一起跟隨小編過來看看吧

本文講述了Android TV開發(fā):使用RecycleView實(shí)現(xiàn)橫向的Listview并響應(yīng)點(diǎn)擊事件的代碼。分享給大家供大家參考,具體如下:

1.先貼出自己的效果圖(可橫向滾動,并響應(yīng)item點(diǎn)擊事件):

2.關(guān)于點(diǎn)擊事件的實(shí)現(xiàn)細(xì)節(jié)

核心:使用接口回調(diào)

在adapter中自己定義了個(gè)接口,然后在onBindViewHolder中去為holder.itemView去設(shè)置相應(yīng)的監(jiān)聽最后回調(diào)我們設(shè)置的監(jiān)聽。

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)); 
 // 如果設(shè)置了回調(diào),則設(shè)置點(diǎn)擊事件 
 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設(shè)置監(jiān)聽,并實(shí)現(xiàn)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.實(shí)現(xiàn)橫向效果  

核心:LinearLayoutManager

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

4. 讓RecyclerView的子item獲得焦點(diǎn)

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

5.代碼實(shí)現(xiàn):

//定義自己的布局文件 
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 = "圖片:"+i; 
  mDatas.add(str); 
 } 
 this.setBackgroundColor(Color.parseColor("#407EAf")); 
 this.mContext = context; 
 this.setOrientation(VERTICAL); 
 createLayout(); 
 } 
 private void createLayout() { 
 //空出上邊留白 
 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); 
 //設(shè)置適配器 
 mAdapter = new MyAdapter( mContext,mDatas); 
 mRecyclerView.setAdapter(mAdapter); 
 //監(jiān)聽點(diǎn)擊事件 
 mAdapter.setmOnItemClickLitener(new MyAdapter.OnItemClickLitener() { 
  @Override 
  public void onItemClick(View view, int position) { 
  Toast.makeText(mContext,"點(diǎn)擊了圖片:"+position,Toast.LENGTH_SHORT).show(); 
  } 
 }); 
 
 //讓RecyclerView的子item獲得焦點(diǎn) 
 mRecyclerView.setOnFocusChangeListener(new OnFocusChangeListener() { 
  @Override 
  public void onFocusChange(View v, boolean hasFocus) { 
  if(hasFocus){ 
   if(mRecyclerView.getChildCount()>0){ 
   mRecyclerView.getChildAt(0).requestFocus(); 
   } 
  } 
  } 
 }); 
 } 
//定義適配器類 
 public static class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> 
 { 
 private Context mContext; 
 private List<String> mDatas; 
 private LayoutInflater mInflater; 
 private OnItemClickLitener mOnItemClickLitener; 
 //定義點(diǎn)擊事件的接口 
 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(); 
 } 
 /** 
  * 創(chuàng)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; 
 } 
 /** 
  * 設(shè)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); 
  //設(shè)置回調(diào) 
  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 //我們需要inflate的item布局需要傳入 
 { 
  Button btn; 
  public ViewHolder(View arg0) 
  { 
  super(arg0); 
  btn = (Button) arg0.findViewById(R.id.btn); 
  } 
 } 
 } 
//在activity加載自己的布局 
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.源碼及apk

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