android 数字以动画的形式动态增长 源码

【实例简介】

        数字动画的形式增长

【实例截图】

【核心代码】

import android.content.Context;
import android.util.AttributeSet;
import android.widget.TextView;

import com.bear.risenumber.R;
import com.nineoldandroids.animation.ValueAnimator;

import java.text.DecimalFormat;

/**
 * 自定义RiseNumberTextView继承TextView，并实现接口RiseNumberBase
 * 
 */
public class RiseNumberTextView extends TextView implements IRiseNumber {

private static final int STOPPED = 0;

private static final int RUNNING = 1;

private int mPlayingState = STOPPED;

private float number;

private float fromNumber;

/**
* 动画播放时长
*/
private long duration = 1500;
/**
* 1.int 2.float
*/
private int numberType = 2;

private DecimalFormat fnum;

private EndListener mEndListener = null;

final static int[] sizeTable = { 9, 99, 999, 9999, 99999, 999999, 9999999,
99999999, 999999999, Integer.MAX_VALUE };

/**
* 构造方法
* 
* @param context
*/
public RiseNumberTextView(Context context) {
super(context);
}

/**
* 使用xml布局文件默认的被调用的构造方法
* 
* @param context
* @param attr
*/
public RiseNumberTextView(Context context, AttributeSet attr) {
super(context, attr);
setTextColor(context.getResources().getColor(R.color.rise_number_text_color_red));
setTextSize(30);
}

public RiseNumberTextView(Context context, AttributeSet attr, int defStyle) {
super(context, attr, defStyle);
}

/**
* 判断动画是否正在播放
* 
* @return
*/
public boolean isRunning() {
return (mPlayingState == RUNNING);
}

/**
* 跑小数动画
*/
private void runFloat() {
ValueAnimator valueAnimator = ValueAnimator.ofFloat(fromNumber, number);
valueAnimator.setDuration(duration);

valueAnimator
.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {

setText(fnum.format(Float.parseFloat(valueAnimator
.getAnimatedValue().toString())));
if (valueAnimator.getAnimatedFraction() >= 1) {
mPlayingState = STOPPED;
if (mEndListener != null)
mEndListener.onEndFinish();
}
}


});

valueAnimator.start();
}

/**
* 跑整数动画
*/
private void runInt() {

ValueAnimator valueAnimator = ValueAnimator.ofInt((int) fromNumber,
(int) number);
valueAnimator.setDuration(duration);

valueAnimator
.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
//设置瞬时的数据值到界面上
setText(valueAnimator.getAnimatedValue().toString());
if (valueAnimator.getAnimatedFraction() >= 1) {
//设置状态为停止
mPlayingState = STOPPED;
if (mEndListener != null)
//通知监听器，动画结束事件
mEndListener.onEndFinish();
}
}
});
valueAnimator.start();
}

static int sizeOfInt(int x) {
for (int i = 0;; i ){
if (x <= sizeTable[i])
return i 1;
}
}

@Override
protected void onFinishInflate() {
super.onFinishInflate();
fnum = new DecimalFormat("##0.00");
}

/**
* 开始播放动画
*/
@Override
public void start() {

if (!isRunning()) {
mPlayingState = RUNNING;
if (numberType == 1)
runInt();
else
runFloat();
}
}

/**
* 设置一个小数进来
*/
@Override
public void withNumber(float number) {

this.number = number;
numberType = 2;
if (number > 1000) {
fromNumber = number
- (float) Math.pow(10, sizeOfInt((int) number) - 1);
} else {
fromNumber = number / 2;
}

}

/**
* 设置一个整数进来
*/
@Override
public void withNumber(int number) {
this.number = number;
numberType = 1;
if (number > 1000) {
fromNumber = number
- (float) Math.pow(10, sizeOfInt((int) number) - 2);
} else {
fromNumber = number / 2;
}

}

/**
* 设置动画播放时间
*/
@Override
public void setDuration(long duration) {
this.duration = duration;
}

/**
* 设置动画结束监听器
*/
@Override
public void setOnEndListener(EndListener callback) {
mEndListener = callback;
}

/**
* 定义动画结束接口
* 
* 
*/
public interface EndListener {
/**
* 当动画播放结束时的回调方法
*/
public void onEndFinish();
}

}