一个WP8样式的进度对话框。对应Android转圈圈的ProgressBar。使用方法和普通的dialog一样

public class Win8ProgressDialog extends Dialog {    private WPLoading loading;    public Win8ProgressDialog(Context context) {        super(context);    }    public Win8ProgressDialog(Context context, int theme) {        super(context, theme);    }    public void setLoading(WPLoading loading) {        this.loading = loading;    }    @Override    public void cancel() {        loading.cancel();        super.cancel();    }    public Win8ProgressDialog(Context context, boolean cancelable,            OnCancelListener cancelListener) {        super(context, cancelable, cancelListener);    }    public static class Builder {        private Context mContext;        private boolean canceledOnTouchOutside = true;        private boolean cancelable = true;        public Builder(Context context) {            mContext = context;        }        public Builder setCanceledOnTouchOutside(boolean flag) {            canceledOnTouchOutside = flag;            return this;        }        public Builder setCancelable(boolean flag) {            cancelable = flag;            return this;        }        public Win8ProgressDialog create() {            final Win8ProgressDialog dialog = new Win8ProgressDialog(mContext,                    R.style.WPDialog);            WPLoading loading = new WPLoading(mContext);            dialog.setLoading(loading);            dialog.setCancelable(cancelable);            dialog.setCanceledOnTouchOutside(canceledOnTouchOutside);            dialog.setCanceledOnTouchOutside(false);            dialog.addContentView(loading, new LayoutParams(                    LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));            loading.startAnimate();            return dialog;        }    }}

WPLoading是Win8ProgressDialog显示的view，其实是一个包含了运动五个小蓝点的RelativeLayout，小蓝点的动画使用了一个先减速后加速的插值器DecelerateAccelerateStopInterpolator

public class WPLoading extends RelativeLayout {	private int size = 10;	private int delay = 300;	private int duration = 3200;	private String color = "#0000ff";	private AnimatorSet animatorSet = new AnimatorSet();	public WPLoading(Context context) {		super(context);		LayoutParams params0 = new LayoutParams(				DisplayUtil.getScreenWidth(context), size);		View view = new View(context);		view.setLayoutParams(params0);		addView(view);	}	public void startAnimate() {		LayoutParams params = new LayoutParams(size, size);		animatorSet = new AnimatorSet();		ArrayList
     
       animators = new ArrayList
      
       ();		for (int i = 0; i < 5; i++) {			View view = new View(getContext());			view.setBackgroundColor(Color.parseColor(color));			addView(view);			view.setLayoutParams(params);			view.setX(-size);			ObjectAnimator headAnimator = ObjectAnimator.ofFloat(view, "x",					view.getX(), DisplayUtil.getScreenWidth(getContext()));			headAnimator.setDuration(duration);			headAnimator					.setInterpolator(new DecelerateAccelerateStopInterpolator());			headAnimator.setStartDelay(delay * i);			headAnimator.setRepeatCount(-1);			animators.add(headAnimator);		}		animatorSet.playTogether(animators);		animatorSet.start();	}	public WPLoading(Context context, AttributeSet attrs) {		super(context, attrs);	}	public WPLoading(Context context, AttributeSet attrs, int defStyle) {		super(context, attrs, defStyle);	}	public void cancel() {		animatorSet.end();	}	// 先减速再加速的插值器，在加速完成后会再停止一会儿，循环地进行这个动画，就和WP8的Loading样式一样了	class DecelerateAccelerateStopInterpolator implements			android.view.animation.Interpolator {		private float mFactor = 1.0f;		private float tailFactor = 0.6f;		public DecelerateAccelerateStopInterpolator() {		}		public DecelerateAccelerateStopInterpolator(float factor) {			mFactor = factor;		}		public float getInterpolation(float x) {			float result;			if (x > tailFactor) {				result = 1;			} else if (x > tailFactor / 2) {				result = (float) Math.pow(						(x - tailFactor / 2) * 2 / tailFactor, 2 * mFactor) / 2 + 0.5f;			} else {				result = (float) (1.0f - Math.pow((tailFactor - 2 * x)						/ tailFactor, 2 * mFactor)) / 2;			}			return result;		}	}}