Android RecyclerView打造自动循环效果

这篇文章主要为大家详细介绍了android RecyclerView打造自动循环效果，非常实用的循环滚动效果,具有一定的参考价值，感兴趣的小伙伴们可以参考一下

先看效果图:

RecyclerView打造自动循环效果.gif

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

我这里是在xml中添加的LinearLayoutManager，也可以在java代码中setLayoutManager

<com.zxj.AutoPollRecyclerView
        android:id="@+id/recycleView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layoutManager="LinearLayoutManager"/>

public class AutoPollRecyclerView extends RecyclerView {

    private static final long TIME_AUTO_POLL = 16;
    AutoPollTask autoPollTask;
    private boolean running; //表示是否正在自动轮询
    private boolean canRun;//表示是否可以自动轮询

    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, 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<AutoPollAdapter.BaseViewHolder> {
    private final List<String> mData;

    public AutoPollAdapter(List<String> list) {
        this.mData = list;
    }

    @Override
    public BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).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.tv.setText(data);
    }

    @Override
    public int getItemCount() {
        return Integer.MAX_VALUE;
    }

    class BaseViewHolder extends RecyclerView.ViewHolder{
        TextView tv;
        public BaseViewHolder(View itemView) {
            super(itemView);
            tv = itemView.findViewById(R.id.tv_content);
        }
    }
}

最后附上Activity调用的代码

public class MainActivity extends AppCompatActivity {

    private AutoPollRecyclerView mRecyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }
    private void initView() {
        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(list);
        mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
        mRecyclerView.setAdapter(adapter);
        mRecyclerView.start();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if(null != mRecyclerView){
            mRecyclerView.stop();
        }
    }
}