Android RecyclerView打造自动循环效果

先看效果图

主要处理的地方:
1、RecyclerView中Adapter的item个人可以无限轮询.
2、RecyclerView自动滑动
3、手指按下时滑动停止,手指抬起后继续自动滑动

public class AutoPollRecyclerView extends RecyclerView {
 private static final long TIME_AUTO_POLL = 16;
 AutoPollTask autoPollTask;
 private boolean running; //标示是否正在自动轮询
 private boolean canRun;//标示是否可以自动轮询,可在不需要的是否置false
 public AutoPollRecyclerView(Context context, @Nullable AttributeSet attrs) {
  super(context, attrs);
  autoPollTask = new AutoPollTask(this);
 }
 static class AutoPollTask implements Runnable {
  private final WeakReference<AutoPollRecyclerView> mReference;
  //使用弱引用持有外部类引用->防止内存泄漏
  public AutoPollTask(AutoPollRecyclerView reference) {
   this.mReference = new WeakReference<AutoPollRecyclerView>(reference);
  }
  @Override
  public void run() {
   AutoPollRecyclerView recyclerView = mReference.get();
   if (recyclerView != null && recyclerView.running &&recyclerView.canRun) {
    recyclerView.scrollBy(2, 2);
    recyclerView.postDelayed(recyclerView.autoPollTask,recyclerView.TIME_AUTO_POLL);
   }
  }
 }
 //开启:如果正在运行,先停止->再开启
 public void start() {
  if (running)
   stop();
  canRun = true;
  running = true;
  postDelayed(autoPollTask,TIME_AUTO_POLL);
 }
 public void stop(){
  running = false;
  removeCallbacks(autoPollTask);
 }
 @Override
 public boolean onTouchEvent(MotionEvent e) {
  switch (e.getAction()){
   case MotionEvent.ACTION_DOWN:
    if (running)
     stop();
    break;
   case MotionEvent.ACTION_UP:
   case MotionEvent.ACTION_CANCEL:
   case MotionEvent.ACTION_OUTSIDE:
    if (canRun)
     start();
    break;
  }
  return super.onTouchEvent(e);
 }
}

Adapter处理:主要处理getItemCount()和数据填充的onBindViewHolder()方法

public class AutoPollAdapter extends RecyclerView.Adapter<BaseViewHolder> {
 private final Context mContext;
 private final List<String> mData;
 public AutoPollAdapter(Context context, List<String> list) {
  this.mContext = context;
  this.mData = list;
 }
 @Override
 public BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
  View view = LayoutInflater.from(mContext).inflate(R.layout.item_auto_poll, parent, false);
  BaseViewHolder holder = new BaseViewHolder(view);
  return holder;
 }
 @Override
 public void onBindViewHolder(BaseViewHolder holder, int position) {
  String data = mData.get(position%mData.size());
  holder.setText(R.id.tv_content,data);
 }
 @Override
 public int getItemCount() {
  return Integer.MAX_VALUE;
 }
}

最后附上Activity调用的代码

public class AutoPollRecyclerActivity extends BaseActivity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_auto_poll);
  initToolBar();
  initView();
 }
 private void initView() {
  AutoPollRecyclerView mRecyclerView = (AutoPollRecyclerView) findViewById(R.id.rv_recycleView);
  List<String> list = new ArrayList<>();
  for (int i = 0; i < 5; ) {
   list.add(" Item: " + ++i);
  }
  AutoPollAdapter adapter = new AutoPollAdapter(this, list);
  mRecyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false));
  mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.HORIZONTAL_LIST));
  mRecyclerView.setAdapter(adapter);
  if (true) //保证itemCount的总个数宽度超过屏幕宽度->自己处理
   mRecyclerView.start();
 }
}

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