Android中奖结果滚动效果

大家可能在网上看到许多中奖结果滚动效果，这种效果怎么实现呢？

public class AutoScrollView extends ScrollView {
    private long speed = 50;
    private int eachRollLength = 1;
    private Timer timer;
    private TimerTask timerTask;
    private boolean isCanScroll = false;
    private boolean scrollEnable = false;//是否可以触摸滚动

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

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

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

    @Override
    public boolean onInterceptTouchEvent(MotionEvent p_event) {
        return scrollEnable;
    }

    /**
     * 开始滚动
     */
    public void startRoll() {
        // 取消之前的滚动
        cancelRoll();
        smoothScrollTo(0, 0);// 滚动到开始位置

        timer = new Timer();
        timerTask = new TimerTask() {
            @Override
            public void run() {
                if (!isCanScroll)
                    return;
                if (getScrollY() >= getHeight()) {
                    // 超出滚动列表
                    smoothScrollTo(0, 0);
                } else {
                    smoothScrollBy(0, eachRollLength);
                }
            }
        };
        isCanScroll = true;
        timer.schedule(timerTask, speed, speed);
    }

    /**
     * 暂停滚动
     */
    public void pauseRoll() {
        isCanScroll = false;
    }

    /**
     * 重新恢复滚动
     */
    public void restartRoll() {
        isCanScroll = true;
    }

    /**
     * 停止滚动，即取消滚动
     */
    public void stopRoll() {
        cancelRoll();
    }

    /**
     * 取消滚动
     */
    public void cancelRoll() {
        if (timerTask != null) {
            timerTask.cancel();
            timerTask = null;
        }
        if (timer != null) {
            timer.cancel();
            timer = null;
        }
    }

    /**
     * 设置是否可以触摸滚动
     */
    public void setScrollEnable(boolean scrollEnable) {
        this.scrollEnable = scrollEnable;
    }

    /**
     * 设置每次滚动的长度
     */
    public void setEachRollLength(int eachRollLength) {
        this.eachRollLength = eachRollLength;
    }

    /**
     * 设置滚动的速度，值越大，速度越小
     */
    public void setSpeed(long speed) {
        this.speed = speed;
    }
}

布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.qiyuan.jindongshangcheng.view.AutoScrollView
        android:id="@+id/autoscrollview"
        android:layout_width="match_parent"
        android:layout_height="100dp">

        <LinearLayout
            android:id="@+id/containt"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">


        </LinearLayout>

    </com.qiyuan.jindongshangcheng.view.AutoScrollView>


</RelativeLayout>

注意，外面必须嵌套一个控件，不然在Android6.0以上系统，不会自己滚动

在MainActivity中使用

package com.qiyuan.jindongshangcheng;

import android.app.Activity;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.qiyuan.jindongshangcheng.view.AutoScrollView;

/**
 * Created by huanghaojie on 2016/10/8.
 */

public class MainActivity5 extends Activity {
    private LinearLayout contain;
    private AutoScrollView autoScrollView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mian5);
        contain = (LinearLayout) findViewById(R.id.containt);
        autoScrollView = (AutoScrollView) findViewById(R.id.autoscrollview);

        initView();

    }
    private void initView(){
        contain.removeAllViews();
        for (int i = 0; i <50 ; i++) {
            TextView te = new TextView(this);
            te.setText(i+"");
            contain.addView(te);
        }

	autoScrollView.startRoll();

    }
}