Android RecyclerView打造自动循环效果

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); }}

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; }}

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(); }}