關於這個功能，我目前有兩種方法實現：
一個是在TextView 中加上翻轉的動畫效果，然後設定迴圈滾動；一種是改寫ViewPager 的滾動方向，使它從下到上進行滾動，並設定迴圈滾動；

首先介紹第一種方法：
實現思路：自定義TextView，在TextView中加上從下到上滾動的動畫效果，然後設定迴圈播放；

建立一個AutoTextVieW使之繼承TextView,然後在onDraw方法中呼叫getHeight()方法獲取textview當前的高度。
在接下來的動畫翻轉效果中，根據這個高度設定TextView上下滾動的距離。下面是動畫實現的方法：

/**
 * 向上脫離螢幕的動畫效果
 */
private void animationStart() {
    ObjectAnimator translate = ObjectAnimator.ofFloat(this, "translationY", 0, -height);
    ObjectAnimator alpha = ObjectAnimator.ofFloat(this, "alpha", 1f, 0f);
    mAnimStart = new AnimatorSet();
    mAnimStart.play(translate).with(alpha);
    mAnimStart.setDuration(DURATION);
    mAnimStart.addListener(this);

}

/**
 * 從螢幕下面向上的動畫效果
 */
public void animationOver() {
    ObjectAnimator translate = ObjectAnimator.ofFloat(this, "translationY", height, 0);
    ObjectAnimator alpha = ObjectAnimator.ofFloat(this, "alpha", 0f, 1f);
    mAnimOver = new AnimatorSet();
    mAnimOver.play(translate).with(alpha);
    mAnimOver.setDuration(DURATION);

}
 

接下來實現ObjectAnimator的監聽事件，在onAnimationEnd 呼叫setText方法，在動畫沒結束一次更新文字，並且繼續執行動畫效果

 @Override
public void onAnimationEnd(Animator animator) {
    super.setText(mText);
    if (mAnimOver == null) {
       animationOver();

    }

    mAnimOver.start();
}

然後呼叫一個可以設定迴圈滾動的類，這裡可以使用ScheduledExecutorService，也可以使用 Timer幾設定計時滾動，在更新UI的時候，呼叫Handler方法更新；
因為採用Timer執行定時任務時只建立一個執行緒，所以這裡建議採用ScheduledExecutorService；

/**
 * 獲取資料並設定滾動播放
 * @param textView
 * @param list
 * @param autoPlayTime
 */
public void getTextData(final IdeaAutoTextview textView, List<String> list, int autoPlayTime) {
    this.textView = textView;
    this.textList = list;

    if (autoPlayTime != 0) {

        scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
        scheduledExecutorService.scheduleWithFixedDelay(new WeakTimerTask(this), autoPlayTime, autoPlayTime, TimeUnit.SECONDS);
    }
}



private TimeTaskHandler mHandler = new TimeTaskHandler(this);

private static class WeakTimerTask extends TimerTask {
    private WeakReference<IdeaAutoTextview> autoTextReference;

    public WeakTimerTask(IdeaAutoTextview mautoText) {
        this.autoTextReference = new WeakReference<>(mautoText);
    }

    @Override
    public void run() {
        IdeaAutoTextview autoText = autoTextReference.get();
        if (autoText != null) {
            if (autoText.isShown()) {
                autoText.mHandler.sendEmptyMessage(0);
            }
        } else {
            cancel();
        }
    }
}
 

定時重新整理頻率較高，容易產生記憶體洩漏，這裡採用弱引用避免這個情況發生

private final class TimeTaskHandler extends Handler {
    private WeakReference<IdeaAutoTextview> autoTextReference;

    public TimeTaskHandler(IdeaAutoTextview autoText) {
        this.autoTextReference = new WeakReference<>(autoText);
    }

    @Override
    public void handleMessage(Message msg) {
        IdeaAutoTextview autoText = autoTextReference.get();

        if (autoText!=null)
        {
            /**
             * 設定當前文字
             */
            String text = textList.get(index);
            index++;
            if (index > textList.size() - 1) {
                index = 0;
            }
            textView.setAutoText(text);
        }


    }
}

到此第一種方法介紹完畢。

第二種方法實現的原理和輪播圖的原理類似，輪播圖一般是左右橫向滾動，這裡需要把ViewPager改成上下滑動，關於上下滑動的viewpager,可以在給github上找到；
其次輪播圖中播放的是圖片，把圖片換成文字即可；
然後同樣呼叫Timer或者ScheduledExecutorService使ViewPager自行滾動；
以下是程式碼：

package com.idea.idea.viewutils;

import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.widget.RelativeLayout;

import java.lang.ref.WeakReference;
import java.util.TimerTask;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

/**
 * todo：修改ViewPager方法實現文字滾動
 *
 * @author: Create by qjj
 * @email: [email protected]
 */
public class AutoViewpager extends RelativeLayout{

    private VerticalViewPager mVerticalViewPager;
    private PagerAdapter mAdapter;
    private int autoPlayTime;
    private ScheduledExecutorService scheduledExecutorService;

    public AutoViewpager(Context context){
        this(context,null);
    }

    public AutoViewpager(Context context, AttributeSet attrs) {
        this(context, attrs, 0);

    }

    public AutoViewpager(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initView();
    }


    /**
     * 初始化view
     */
    private void initView(){
        if(mVerticalViewPager!=null){
            removeView(mVerticalViewPager);
        }
        mVerticalViewPager = new VerticalViewPager(getContext());
        mVerticalViewPager.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
        addView(mVerticalViewPager);

    }

    private final static class TimeTaskHandler extends Handler {
        private WeakReference<AutoViewpager> mRollPagerViewWeakReference;

        public TimeTaskHandler(AutoViewpager autoViewpager) {
            this.mRollPagerViewWeakReference = new WeakReference<>(autoViewpager);
        }

        @Override
        public void handleMessage(Message msg) {
            AutoViewpager autoViewpager = mRollPagerViewWeakReference.get();
            int cur = autoViewpager.getViewPager().getCurrentItem()+1;
            if(cur>= autoViewpager.mAdapter.getCount()){
                cur=0;
            }
            autoViewpager.getViewPager().setCurrentItem(cur);

        }
    }
    private TimeTaskHandler mHandler = new TimeTaskHandler(this);

    private static class WeakTimerTask extends TimerTask {
        private WeakReference<AutoViewpager> mRollPagerViewWeakReference;

        public WeakTimerTask(AutoViewpager mAutoViewpager) {
            this.mRollPagerViewWeakReference = new WeakReference<>(mAutoViewpager);
        }

        @Override
        public void run() {
            AutoViewpager autoViewpager = mRollPagerViewWeakReference.get();
            if (autoViewpager !=null){
                if(autoViewpager.isShown()){
                    autoViewpager.mHandler.sendEmptyMessage(0);
                }
            }else{
                cancel();
            }
        }
    }

    /**
     * 開始滾動
     */
    private void autoPlay(){
        if(autoPlayTime<=0||mAdapter == null||mAdapter.getCount()<=1){
            return;
        }

        scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
        scheduledExecutorService.scheduleWithFixedDelay(new WeakTimerTask(this), autoPlayTime, autoPlayTime, TimeUnit.SECONDS);
    }

    public void setAutoTime(int autoPlayTime){
        this.autoPlayTime = autoPlayTime;
        autoPlay();
    }


    /**
     * viewpager
     * @return
     */
    public ViewPager getViewPager() {
        return mVerticalViewPager;
    }

    /**
     * 設定Adapter
     * @param adapter
     */
    public void setAdapter(PagerAdapter adapter){
        mVerticalViewPager.setAdapter(adapter);
        mAdapter = adapter;
        dataChanged();
    }
    private void dataChanged(){
        autoPlay();
    }

}