Android 圆环进度条绘制

实现一个自定义圆环进度条

public class CircularProgressBar extends View {// Propertiesprivate float progress = 0;private float strokeWidth = getResources().getDimension(R.dimen.default_stroke_width);private float backgroundStrokeWidth = getResources().getDimension(R.dimen.default_background_stroke_width);private int color = Color.BLACK;private int backgroundColor = Color.GRAY;// Object used to drawprivate int startAngle = -90;private RectF rectF;private Paint backgroundPaint;private Paint foregroundPaint;//region Constructor & Init Methodpublic CircularProgressBar(Context context, AttributeSet attrs) {super(context, attrs);init(context, attrs);}private void init(Context context, AttributeSet attrs) {rectF = new RectF();TypedArray typedArray = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CircularProgressBar, 0, 0);//Reading values from the XML layouttry {// Valueprogress = typedArray.getFloat(R.styleable.CircularProgressBar_cpb_progress, progress);// StrokeWidthstrokeWidth = typedArray.getDimension(R.styleable.CircularProgressBar_cpb_progressbar_width, strokeWidth);backgroundStrokeWidth = typedArray.getDimension(R.styleable.CircularProgressBar_cpb_background_progressbar_width, backgroundStrokeWidth);// Colorcolor = typedArray.getInt(R.styleable.CircularProgressBar_cpb_progressbar_color, color);backgroundColor = typedArray.getInt(R.styleable.CircularProgressBar_cpb_background_progressbar_color, backgroundColor);} finally {typedArray.recycle();}// Init BackgroundbackgroundPaint = new Paint(Paint.ANTI_ALIAS_FLAG);backgroundPaint.setColor(backgroundColor);backgroundPaint.setStyle(Paint.Style.STROKE);backgroundPaint.setStrokeWidth(backgroundStrokeWidth);// Init ForegroundforegroundPaint = new Paint(Paint.ANTI_ALIAS_FLAG);foregroundPaint.setColor(color);foregroundPaint.setStyle(Paint.Style.STROKE);foregroundPaint.setStrokeWidth(strokeWidth);}//endregion//region Draw Method@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);canvas.drawOval(rectF, backgroundPaint);float angle = 360 * progress / 100;canvas.drawArc(rectF, startAngle, angle, false, foregroundPaint);}//endregion//region Mesure Method@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {final int height = getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec);final int width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);final int min = Math.min(width, height);setMeasuredDimension(min, min);float highStroke = (strokeWidth > backgroundStrokeWidth) ? strokeWidth : backgroundStrokeWidth;rectF.set(0 + highStroke / 2, 0 + highStroke / 2, min - highStroke / 2, min - highStroke / 2);}//endregion//region Method Get/Setpublic float getProgress() {return progress;}public void setProgress(float progress) {this.progress = (progress<=100) ? progress : 100;invalidate();}public float getProgressBarWidth() {return strokeWidth;}public void setProgressBarWidth(float strokeWidth) {this.strokeWidth = strokeWidth;foregroundPaint.setStrokeWidth(strokeWidth);requestLayout();//Because it should recalculate its boundsinvalidate();}public float getBackgroundProgressBarWidth() {return backgroundStrokeWidth;}public void setBackgroundProgressBarWidth(float backgroundStrokeWidth) {this.backgroundStrokeWidth = backgroundStrokeWidth;backgroundPaint.setStrokeWidth(backgroundStrokeWidth);requestLayout();//Because it should recalculate its boundsinvalidate();}public int getColor() {return color;}public void setColor(int color) {this.color = color;foregroundPaint.setColor(color);invalidate();requestLayout();}public int getBackgroundColor() {return backgroundColor;}public void setBackgroundColor(int backgroundColor) {this.backgroundColor = backgroundColor;backgroundPaint.setColor(backgroundColor);invalidate();requestLayout();}//endregion//region Other Method/*** Set the progress with an animation.* Note that the {@link ObjectAnimator} Class automatically set the progress* so don't call the {@link CircularProgressBar#setProgress(float)} directly within this method.** @param progress The progress it should animate to it.*/public void setProgressWithAnimation(float progress) {setProgressWithAnimation(progress, 1500);}/*** Set the progress with an animation.* Note that the {@link ObjectAnimator} Class automatically set the progress* so don't call the {@link CircularProgressBar#setProgress(float)} directly within this method.** @param progress The progress it should animate to it.* @param duration The length of the animation, in milliseconds.*/public void setProgressWithAnimation(float progress, int duration) {// 属性 progress 必须要公共的 setProgress 方法ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(this, "progress", progress);objectAnimator.setDuration(duration);objectAnimator.setInterpolator(new DecelerateInterpolator());objectAnimator.start();}//endregion
}

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