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(); } }
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持查字典教程网。
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