本文講述了Android TV開發：使用RecycleView實現橫向的Listview并響應點擊事件的代碼。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item點擊事件)：
2.關于點擊事件的實現細節
核心：使用接口回調
在adapter中自己定義了個接口，然后在onBindViewHolder中去為holder.itemView去設置相應的監聽最后回調我們設置的監聽。
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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)); // 如果設置了回調，則設置點擊事件 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設置監聽，并實現接口
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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.實現橫向效果
核心：LinearLayoutManager
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LinearLayoutManager linearLayoutManager = new LinearLayoutManager(mContext,LinearLayoutManager.HORIZONTAL,false); mRecyclerView.setLayoutManager(linearLayoutManager); |
4. 讓RecyclerView的子item獲得焦點
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mRecyclerView.setOnFocusChangeListener(new OnFocusChangeListener() { @Override public void onFocusChange(View v, boolean hasFocus) { if(hasFocus){ if(mRecyclerView.getChildCount()>0){ mRecyclerView.getChildAt(0).requestFocus(); } } } }); |
5.代碼實現：
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//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); //設置適配器 mAdapter = new MyAdapter( mContext,mDatas); mRecyclerView.setAdapter(mAdapter); //監聽點擊事件 mAdapter.setmOnItemClickLitener(new MyAdapter.OnItemClickLitener() { @Override public void onItemClick(View view, int position) { Toast.makeText(mContext,"點擊了圖片:"+position,Toast.LENGTH_SHORT).show(); } }); //讓RecyclerView的子item獲得焦點 mRecyclerView.setOnFocusChangeListener(new OnFocusChangeListener() { @Override public void onFocusChange(View v, boolean hasFocus) { if(hasFocus){ if(mRecyclerView.getChildCount()>0){ mRecyclerView.getChildAt(0).requestFocus(); } } } }); } |
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//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); //設置回調 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); } } } |
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//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
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<?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
以上就是這篇文章的全部內容了，希望本文的內容對大家的學習或者工作具有一定的參考學習價值，如果有疑問大家可以留言交流，謝謝大家對服務器之家的支持。
原文鏈接：https://blog.csdn.net/meetings/article/details/52926720
