这两天写了一个关于延时加载的控件，之前一直是用的 ， 后来参考了 这个控件设计思路还是很巧妙的。不会用作图工具，凑合着看吧。

怎么用？

<pre>

<github.alex.sweeploadingview.SweepLoadingView xmlns:SweepLoadingView="" android:layout_width="112dp" android:layout_height="112dp" android:layout_centerHorizontal="true" android:layout_marginTop="72dp" SweepLoadingView:slv_circleColor="#795548" SweepLoadingView:slv_circleWidth="8dp" SweepLoadingView:slv_duration="1200" SweepLoadingView:slv_gapAngle="30" SweepLoadingView:slv_strokeCap="square" />

</pre>

效果图

<pre>

package github.alex.sweeploadingview; /** * 作者：Alex * * 时间：2016/8/24 16:31 * * 博客地址： * * */ public class SweepLoadingView extends View { private RectF rectF; private Paint paint; private int circleColor; private int circleWidth; private int strokeCap; /** * 扫描一周 需要的时间 */ private int swipeDuration; /** * 起点的角度 */ private float startAngle; /** * 扫描的角度 */ private float sweepAngle;

/\*\* \* 终点 和 起点的间隔 角度 \*/private float gapAngle;/\*\* \* 起始点的偏移量 \*/private float startAngleOffset;private ObjectAnimator sweepObjectAnimator;private ObjectAnimator startAngleObjectAnimator;/\*\* \* 扫描一周 \*/private boolean isSweepRepeat;public SweepLoadingView(Context context) {    super(context);    initView(null);}public SweepLoadingView(Context context, AttributeSet attrs) {    super(context, attrs);    initView(attrs);}private void initView(AttributeSet attrs) {    startAngleOffset = 0;    isSweepRepeat = false;    initObjectAnimation();}private void initObjectAnimation() {    sweepObjectAnimator = ObjectAnimator.ofFloat(this, new AngleProperty(Float.class, "sweepAngle"), 360F - gapAngle \* 2);    sweepObjectAnimator.setInterpolator(new AccelerateDecelerateInterpolator());    sweepObjectAnimator.setDuration(swipeDuration);    sweepObjectAnimator.setRepeatCount(Integer.MAX_VALUE);    sweepObjectAnimator.setRepeatMode(ValueAnimator.RESTART);    sweepObjectAnimator.addListener(new SweepAngleAnimatorListener());    startAngleObjectAnimator = ObjectAnimator.ofFloat(this, new AngleProperty(Float.class, "startAngle"), 360F);    startAngleObjectAnimator.setInterpolator(new LinearInterpolator());    startAngleObjectAnimator.setDuration(1500);    startAngleObjectAnimator.setRepeatCount(Integer.MAX_VALUE);    startAngleObjectAnimator.setRepeatMode(ValueAnimator.RESTART);}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {    super.onSizeChanged(w, h, oldw, oldh);    int min = Math.min(w, h);    int dWidth = circleWidth / 2;    rectF.left = dWidth;    rectF.right = min - dWidth;    rectF.top = dWidth;    rectF.bottom = min - dWidth;}@Overridepublic void draw(Canvas canvas) {    super.draw(canvas);    canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG));    float startAngle = this.startAngle - startAngleOffset;    float sweepAngle = this.sweepAngle;    if (isSweepRepeat) {        startAngle += sweepAngle;        sweepAngle = 360 - sweepAngle - gapAngle;    } else {        sweepAngle += gapAngle;    }    canvas.drawArc(rectF, startAngle, sweepAngle, false, paint);}private void startSweepAnimation() {    if (!sweepObjectAnimator.isStarted()) {        LogUtil.e("开始");        sweepObjectAnimator.start();    }    if (!startAngleObjectAnimator.isStarted()) {        startAngleObjectAnimator.start();    }}private void stopSweepAnimation() {    LogUtil.e("停止");    sweepObjectAnimator.cancel();    startAngleObjectAnimator.cancel();}private final class SweepAngleAnimatorListener extends SimpleAnimatorListener {    @Override    public void onAnimationRepeat(Animator animation) {        handleSweepRepeat();    }}/\*\* \* 处理扫描一周的 情况 \*/private void handleSweepRepeat() {    if (isSweepRepeat) {        startAngleOffset = (startAngleOffset + gapAngle \* 2) % 360;    }    isSweepRepeat = !isSweepRepeat;}private final class AngleProperty extends Property
     
       {    private String name;    public AngleProperty(Class
      
        type, String name) {        super(type, name);        this.name = name;    }    @Override    public Float get(SweepLoadingView object) {        if ("sweepAngle".equals(name)) {            return object.getSweepAngle();        } else {            return object.getStartAngle();        }    }    @Override    public void set(SweepLoadingView object, Float value) {        if ("sweepAngle".equals(name)) {            object.setSweepAngle(value);        } else {            object.setStartAngle(value);        }    }}private float getSweepAngle() {    return sweepAngle;}private void setSweepAngle(float sweepAngle) {    this.sweepAngle = sweepAngle;    invalidate();}private float getStartAngle() {    return startAngle;}private void setStartAngle(float startAngle) {    this.startAngle = startAngle;    invalidate();}
      
     

}

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