RecyclerView实用-打造自动循环的RecyclView

• 先看效果图
• 
  
• 主要处理的地方:

1. RecyclerView中Adapter的item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

1. public class AutoPollRecyclerView extends RecyclerView {
3. private static final long TIME_AUTO_POLL = 16;
4. AutoPollTask autoPollTask;
5. private boolean running; //标示是否正在自动轮询
6. private boolean canRun;//标示是否可以自动轮询,可在不需要的是否置false
8. public AutoPollRecyclerView(Context context, @Nullable AttributeSet attrs) {
9. super(context, attrs);
10. autoPollTask = new AutoPollTask(this);
11. }
13. static class AutoPollTask implements Runnable {
15. private final WeakReference<AutoPollRecyclerView> mReference;
17. //使用弱引用持有外部类引用->防止内存泄漏
18. public AutoPollTask(AutoPollRecyclerView reference) {
19. this.mReference = new WeakReference<AutoPollRecyclerView>(reference);
20. }
22. @Override
23. public void run() {
24. AutoPollRecyclerView recyclerView = mReference.get();
25. if (recyclerView != null && recyclerView.running &&recyclerView.canRun) {
26. recyclerView.scrollBy(2, 2);
27. recyclerView.postDelayed(recyclerView.autoPollTask,recyclerView.TIME_AUTO_POLL);
28. }
29. }
30. }
32. //开启:如果正在运行,先停止->再开启
33. public void start() {
34. if (running)
35. stop();
36. canRun = true;
37. running = true;
38. postDelayed(autoPollTask,TIME_AUTO_POLL);
39. }
41. public void stop(){
42. running = false;
43. removeCallbacks(autoPollTask);
44. }
46. @Override
47. public boolean onTouchEvent(MotionEvent e) {
48. switch (e.getAction()){
49. case MotionEvent.ACTION_DOWN:
50. if (running)
51. stop();
52. break;
53. case MotionEvent.ACTION_UP:
54. case MotionEvent.ACTION_CANCEL:
55. case MotionEvent.ACTION_OUTSIDE:
56. if (canRun)
57. start();
58. break;
59. }
60. return super.onTouchEvent(e);
61. }
62. }

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

1. public class AutoPollAdapter extends RecyclerView.Adapter<BaseViewHolder> {
3. private final Context mContext;
4. private final List<String> mData;
6. public AutoPollAdapter(Context context, List<String> list) {
7. this.mContext = context;
8. this.mData = list;
9. }
11. @Override
12. public BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
13. View view = LayoutInflater.from(mContext).inflate(R.layout.item_auto_poll, parent, false);
14. BaseViewHolder holder = new BaseViewHolder(view);
15. return holder;
16. }
18. @Override
19. public void onBindViewHolder(BaseViewHolder holder, int position) {
20. String data = mData.get(position%mData.size());
21. holder.setText(R.id.tv_content,data);
23. }
25. @Override
26. public int getItemCount() {
27. return Integer.MAX_VALUE;
28. }
29. }

• 最后附上Activity调用的代码

1. public class AutoPollRecyclerActivity extends BaseActivity {
3. @Override
4. protected void onCreate(Bundle savedInstanceState) {
5. super.onCreate(savedInstanceState);
6. setContentView(R.layout.activity_auto_poll);
7. initToolBar();
8. initView();
9. }
11. private void initView() {
12. AutoPollRecyclerView mRecyclerView = (AutoPollRecyclerView) findViewById(R.id.rv_recycleView);
13. List<String> list = new ArrayList<>();
14. for (int i = 0; i < 5; ) {
15. list.add(" Item: " + ++i);
16. }
17. AutoPollAdapter adapter = new AutoPollAdapter(this, list);
19. mRecyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false));
20. mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.HORIZONTAL_LIST));
21. mRecyclerView.setAdapter(adapter);
22. if (true) //保证itemCount的总个数宽度超过屏幕宽度->自己处理
23. mRecyclerView.start();
24. }
25. }

推荐一款不错的GIF图片制作软件:LICEcap