Android使滚动的数字更好看-轻识

有的时候我们需要一个:

滚动的数字效果才能让用户更有提升感！

1、新建一个接口规定其方法

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

2、把数字格式化，并加入数字变换动画

public class RiseNumberTextView extends android.support.v7.widget.AppCompatTextView 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 = 1000;    /**     * 1.int 2.float     */    private int numberType = 2;
    private boolean flags = true;
    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 {         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) {                if (flags) {                    setText(Utils.format("##0.00").format(Double.parseDouble(valueAnimator.getAnimatedValue().toString())));                    if (valueAnimator.getAnimatedValue().toString().equalsIgnoreCase(number + "")) {                        setText(Utils.format("##0.00").format(Double.parseDouble(number + "")));                    }                } else {                    setText(Utils.format("##0.00").format(Double.parseDouble(valueAnimator.getAnimatedValue().toString())));                    if (valueAnimator.getAnimatedValue().toString().equalsIgnoreCase(number +"" )) {                        setText(Utils.format("##0.00").format(Double.parseDouble(number + "")));                    }                }                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();    }
    @Override    public void start() {
        if (!isRunning()) {            mPlayingState = RUNNING;            if (numberType == 1)                runInt();            else                runFloat();        }    }
    @Override    public RiseNumberTextView withNumber(float number, boolean flag) {
        this.number = number;        this.flags = flag;        numberType = 2;        fromNumber = 0;
        return this;    }
    @Override    public RiseNumberTextView withNumber(float number) {        System.out.println(number);        this.number = number;        numberType = 2;        fromNumber = 0;
        return this;    }
    @Override    public RiseNumberTextView withNumber(int number) {        this.number = number;        numberType = 1;        fromNumber = 0;
        return this;    }
    @Override    public RiseNumberTextView setDuration(long duration) {        this.duration = duration;        return this;    }
    @Override    public void setOnEnd(EndListener callback) {        mEndListener = callback;    }}

其中使用到了Utils工具，里面的format方法

 /**     * 格式化     */    private static DecimalFormat dfs = null;    public static DecimalFormat format(String pattern) {        if (dfs == null) {            dfs = new DecimalFormat();        }        dfs.setRoundingMode(RoundingMode.FLOOR);        dfs.applyPattern(pattern);        return dfs;    }

3、最后使用也非常简单,先withNumber后start

riseNumberTextView.withNumber(num).start();

到这里就结束啦。