Android之增長的數字動畫

本案例是使用開源組件RiseNumberTextView來實現類似手機支付寶中增長的數字效果，首先我們來看一下開源組件中的兩個類分別如下：

package com.bear.risenumbertest.lib;

public interface RiseNumberBase {
public void start();
public RiseNumberTextView withNumber(float number);
public RiseNumberTextView withNumber(int number);
public RiseNumberTextView setDuration(long duration);
public void setOnEnd(RiseNumberTextView.EndListener callback);
}

另一個類：

package com.bear.risenumbertest.lib;

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

import com.nineoldandroids.animation.ValueAnimator;

import java.text.DecimalFormat;

public class RiseNumberTextView extends TextView implements RiseNumberBase{

private static final int STOPPED = 0;

private static final int RUNNING = 1;

private int mPlayingState = STOPPED;

private float number;

private float fromNumber;

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 };

public RiseNumberTextView(Context context){
super(context);
}

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

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

public interface EndListener {
public void onEndFinish();
}

public boolean isRunning() {
return (mPlayingState == RUNNING);
}

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();
}
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) {

setText(valueAnimator.getAnimatedValue().toString());
if (valueAnimator.getAnimatedFraction()>=1){
mPlayingState = STOPPED;
if (mEndListener!=null)
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");
}

@Override
public void start() {

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

@Override
public RiseNumberTextView withNumber(float number) {

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

return this;
}

@Override
public RiseNumberTextView 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;
}

return this;

}

@Override
public RiseNumberTextView setDuration(long duration) {
this.duration=duration;
return this;
}

@Override
public void setOnEnd(EndListener callback) {
mEndListener=callback;
}

}

將這兩個類集成到我們的工程中後，就可以使用了，下面這個是使用范例：

package com.bear.risenumbertest;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.Toast;

import com.bear.risenumbertest.lib.RiseNumberTextView;
import com.bear.risenumbertest.lib.RiseNumberTextView.EndListener;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

//獲取到RiseNumberTextView對象
RiseNumberTextView rnTextView = (RiseNumberTextView) findViewById(R.id.risenumber_textview);
// 設置數據
rnTextView.withNumber(2666.50f);
// 設置動畫播放時間
rnTextView.setDuration(5000);
// 開始播放動畫
rnTextView.start();
// 監聽動畫播放結束
rnTextView.setOnEnd(new EndListener() {

@Override
public void onEndFinish() {
Toast.makeText(MainActivity.this, "數據增長完畢...",
Toast.LENGTH_SHORT).show();
}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

附上效果圖：

最後附上Android之增長的數字動畫完整的工程源碼鏈接：

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具體下載目錄在 /2014年資料/12月/15日/Android之增長的數字

下載方法見 http://www.linuxidc.com/Linux/2013-07/87684.htm

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