RollNum ,滚动数字

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github源码下载
这里写图片描述

package com.oblivion.myapplication;import android.support.annotation.NonNull;import android.widget.TextView;import java.util.LinkedList;import java.util.Random;/** * author:Created by Oblivion on 2017/1/12. */public class NumAnim {    //每秒刷新多少次    private static final int COUNTPERS = 100;    public static void startAnim(TextView textV, @NonNull float num) {        startAnim(textV, num, 500);    }    public static void startAnim(TextView textV, float num, long time) {        if (num == 0) {            textV.setText(NumUtil.NumberFormat(num, 2));            return;        }        Float[] nums = splitnum(num, (int) ((time / 1000f) * COUNTPERS));        Counter counter = new Counter(textV, nums, time);        textV.removeCallbacks(counter);        textV.post(counter);    }    private static Float[] splitnum(float num, int count) {        Random random = new Random();        float numtemp = num;        float sum = 0;        LinkedList<Float> nums = new LinkedList<>();        nums.add(0f);        while (true) {            float nextFloat = NumUtil.NumberFormatFloat(                    (random.nextFloat() * num * 2f) / (float) count,                    2);            System.out.println("next:" + nextFloat);            if (numtemp - nextFloat >= 0) {                sum = NumUtil.NumberFormatFloat(sum + nextFloat, 2);                nums.add(sum);                numtemp -= nextFloat;            } else {                nums.add(num);                return nums.toArray(new Float[0]);            }        }    }    static class Counter implements Runnable {        private final TextView view;        private Float[] nums;        private long pertime;        private int i = 0;        Counter(TextView view, Float[] nums, long time) {            this.view = view;            this.nums = nums;            this.pertime = time / nums.length;        }        @Override        public void run() {            if (i > nums.length - 1) {                view.removeCallbacks(Counter.this);                return;            }            view.setText(NumUtil.NumberFormat(nums[i++], 2));            view.removeCallbacks(Counter.this);            view.postDelayed(Counter.this, pertime);        }    }}

package com.oblivion.myapplication;/** * author:Created by Oblivion on 2017/1/12. */public class NumUtil {    /**     *     * @param f 传入的float值，     * @param m 传入的执行时间     * @return     */    public static String NumberFormat(float f,int m){        return String.format("%."+m+"f",f);    }    public static float NumberFormatFloat(float f,int m){        String strfloat = NumberFormat(f,m);        return Float.parseFloat(strfloat);    }}

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