網(wǎng)上找了一些跑馬燈實現(xiàn)都是直接重寫的textview不停的改變繪制文字的位置來達(dá)到跑馬燈效果，但是有的時候需求要求來回滾動多條信息，用textview實現(xiàn)的就不盡人意了，于是用recyclerview整理了一個
思路就是利用recyclerview的scrollBy不停的滾動，來達(dá)到效果

recyclerview代碼

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;

import androidx.annotation.Nullable;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.cy.utils.LogUtil;

import java.lang.ref.WeakReference;

public class AutoPollRecyclerView extends RecyclerView {
    private static final long TIME_AUTO_POLL = 10;
    AutoPollTask autoPollTask;
    private boolean running; //標(biāo)示是否正在自動輪詢
    private boolean canRun;//標(biāo)示是否可以自動輪詢,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類引用->防止內(nèi)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) {
                LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
                int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();
                if (lastVisibleItemPosition == (Integer.MAX_VALUE - 1))//如果真有人等到一直滾動到最大值那就讓他回到頭部重新滾
                    recyclerView.scrollToPosition(0);
                recyclerView.scrollBy(2, 2);
                recyclerView.postDelayed(recyclerView.autoPollTask, recyclerView.TIME_AUTO_POLL);
            }
        }
    }

    //開啟:如果正在運行,先停止->再開啟
    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) {
        //若果需要觸摸停止就把這里打開
//        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 false;
    }
}

其中要注意recyclerview的adapter里面的getItemCount方法要寫成最大值，

@Override
    public void onBindViewHolder(BaseViewHolder holder, int position) {
        String data = mData.get(position % mData.size());
        holder.setText(R.id.tv_txt, data);
    }

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