NumberAnimTextView

开始的数字是0，然后，使用动画是数字滚动起来。监听动画的变化，然后不断刷新页面。

自定义的数字动画 TextView

package me.bakumon.numberanimtextview;import android.animation.TypeEvaluator;import android.animation.ValueAnimator;import android.content.Context;import android.util.AttributeSet;import android.view.animation.AccelerateDecelerateInterpolator;import android.widget.TextView;import java.math.BigDecimal;import java.math.BigInteger;import java.text.DecimalFormat;/** * 数字增加动画的　TextView * Created by bakumon on 16-11-26. */public class NumberAnimTextView extends TextView {    private String mNumStart = "0";  //    private String mNumEnd; //    private long mDuration = 2000; //    private String mPrefixString = ""; // 前缀    private String mPostfixString = ""; //后缀    public NumberAnimTextView(Context context) {        super(context);    }    public NumberAnimTextView(Context context, AttributeSet attrs) {        super(context, attrs);    }    public NumberAnimTextView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    public void setNumberString(String number) {        setNumberString("0", number);    }    public void setNumberString(String numberStart, String numberEnd) {        mNumStart = numberStart;        mNumEnd = numberEnd;        if (checkNumString(numberStart, numberEnd)) {            // 数字合法　开始数字动画            start();        } else {            // 数字不合法　直接调用　setText　设置最终值            setText(mPrefixString + numberEnd + mPostfixString);        }    }    public void setDuration(long mDuration) {        this.mDuration = mDuration;    }    public void setPrefixString(String mPrefixString) {        this.mPrefixString = mPrefixString;    }    public void setPostfixString(String mPostfixString) {        this.mPostfixString = mPostfixString;    }    private boolean isInt; // 是否是整数    /**     * 校验数字的合法性     *     * @param numberStart 　开始的数字     * @param numberEnd   　结束的数字     * @return 合法性     */    private boolean checkNumString(String numberStart, String numberEnd) {        try {            new BigInteger(numberStart);            new BigInteger(numberEnd);            isInt = true;        } catch (Exception e) {            isInt = false;            e.printStackTrace();        }        try {            BigDecimal start = new BigDecimal(numberStart);            BigDecimal end = new BigDecimal(numberEnd);            return end.compareTo(start) >= 0;        } catch (Exception e) {            e.printStackTrace();            return false;        }    }    private void start() {        ValueAnimator animator = ValueAnimator.ofObject(new BigDecimalEvaluator(), new BigDecimal(mNumStart), new BigDecimal(mNumEnd));        animator.setDuration(mDuration);        animator.setInterpolator(new AccelerateDecelerateInterpolator());        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimator valueAnimator) {                BigDecimal value = (BigDecimal) valueAnimator.getAnimatedValue();                setText(mPrefixString + format(value) + mPostfixString);            }        });        animator.start();    }    /**     * 格式化 BigDecimal ,小数部分时保留两位小数并四舍五入     *     * @param bd 　BigDecimal     * @return 格式化后的 String     */    private String format(BigDecimal bd) {        String pattern;        if (isInt) {            pattern = "#,###";        } else {            pattern = "#,##0.00";        }        DecimalFormat df = new DecimalFormat(pattern);        return df.format(bd);    }    class BigDecimalEvaluator implements TypeEvaluator {        @Override        public Object evaluate(float fraction, Object startValue, Object endValue) {            BigDecimal start = (BigDecimal) startValue;            BigDecimal end = (BigDecimal) endValue;            BigDecimal result = end.subtract(start);            return result.multiply(new BigDecimal("" + fraction)).add(start);        }    }}

Activity中使用：

package io.github.bakumon.numberanimtextview;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import me.bakumon.numberanimtextview.NumberAnimTextView;public class MainActivity extends AppCompatActivity {    private NumberAnimTextView mNumberAnimTextView;    private NumberAnimTextView mNumberAnimTextView1;    private NumberAnimTextView mNumberAnimTextView2;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mNumberAnimTextView = (NumberAnimTextView) findViewById(R.id.text);        mNumberAnimTextView1 = (NumberAnimTextView) findViewById(R.id.text1);        mNumberAnimTextView2 = (NumberAnimTextView) findViewById(R.id.text2);    }    public void start(View view) {        mNumberAnimTextView.setPrefixString("¥");        mNumberAnimTextView.setNumberString("1111.75", "98765432.75");        mNumberAnimTextView1.setNumberString("1234567");        mNumberAnimTextView2.setPostfixString("%");        mNumberAnimTextView2.setNumberString("19.75", "99.75");    }}

转载来源于：https://github.com/Bakumon/NumberAnimTextView