使用Android自定义View实现圆形进度条

public class CircularProgressView extends View { private Paint mBackPaint, mProgPaint; // 绘制画笔 private RectF mRectF; // 绘制区域 private int[] mColorArray; // 圆环渐变色 private int mProgress; // 圆环进度(0-100) /** * 绘制弧线的画笔 */ private Paint progressPaint; /** * 圆弧圆心位置 */ private int centerX, centerY; /** * 圆弧的半径 */ private int circleRadius; public CircularProgressView(Context context) { this(context, null); } public CircularProgressView(Context context, @Nullable AttributeSet attrs) { this(context, attrs, 0); } public CircularProgressView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); @SuppressLint("Recycle") TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.CircularProgressView); // 初始化背景圆环画笔 mBackPaint = new Paint(); mBackPaint.setStyle(Paint.Style.STROKE); // 只描边，不填充 mBackPaint.setStrokeCap(Paint.Cap.ROUND); // 设置圆角 mBackPaint.setAntiAlias(true); // 设置抗锯齿 mBackPaint.setDither(true); // 设置抖动 mBackPaint.setStrokeWidth(typedArray.getDimension(R.styleable.CircularProgressView_backWidth, 5)); mBackPaint.setColor(typedArray.getColor(R.styleable.CircularProgressView_progbgColor, Color.LTGRAY)); // 初始化进度圆环画笔 mProgPaint = new Paint(); mProgPaint.setStyle(Paint.Style.STROKE); // 只描边，不填充 mProgPaint.setStrokeCap(Paint.Cap.ROUND); // 设置圆角 mProgPaint.setAntiAlias(true); // 设置抗锯齿 mProgPaint.setDither(true); // 设置抖动 mProgPaint.setStrokeWidth(typedArray.getDimension(R.styleable.CircularProgressView_progWidth, 10)); mProgPaint.setColor(typedArray.getColor(R.styleable.CircularProgressView_progColor, Color.BLUE)); //初始化结束位置小圆点 progressPaint = new Paint(); progressPaint.setStyle(Paint.Style.FILL); // 填充 progressPaint.setStrokeCap(Paint.Cap.ROUND); // 设置圆角 progressPaint.setAntiAlias(true); // 设置抗锯齿 progressPaint.setDither(true); // 设置抖动 progressPaint.setStrokeWidth(typedArray.getDimension(R.styleable.CircularProgressView_progWidth, 10)); progressPaint.setColor(Color.WHITE); // 初始化进度圆环渐变色 int startColor = typedArray.getColor(R.styleable.CircularProgressView_progStartColor, -1); int firstColor = typedArray.getColor(R.styleable.CircularProgressView_progFirstColor, -1); if (startColor != -1 && firstColor != -1) mColorArray = new int[]{startColor, firstColor}; else mColorArray = null; // 初始化进度 mProgress = typedArray.getInteger(R.styleable.CircularProgressView_progress, 0); typedArray.recycle(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); int viewWide = getMeasuredWidth() - getPaddingLeft() - getPaddingRight(); int viewHigh = getMeasuredHeight() - getPaddingTop() - getPaddingBottom(); int mRectLength = (int) ((viewWide > viewHigh ? viewHigh : viewWide) - (mBackPaint.getStrokeWidth() > mProgPaint.getStrokeWidth() ? mBackPaint.getStrokeWidth() : mProgPaint.getStrokeWidth())); int mRectL = getPaddingLeft() + (viewWide - mRectLength) / 2; int mRectT = getPaddingTop() + (viewHigh - mRectLength) / 2; mRectF = new RectF(mRectL, mRectT, mRectL + mRectLength, mRectT + mRectLength); centerX = getMeasuredWidth() / 2; centerY = getMeasuredHeight() / 2; //计算圆弧半径和圆心点 circleRadius = Math.min(getMeasuredWidth(), getMeasuredHeight()) / 2; circleRadius-=8; // 设置进度圆环渐变色 if (mColorArray != null && mColorArray.length > 1) mProgPaint.setShader(new LinearGradient(0, 0, 0, getMeasuredWidth(), mColorArray, null, Shader.TileMode.MIRROR)); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawArc(mRectF, 0, 360, false, mBackPaint); canvas.drawArc(mRectF, 270, 360 * mProgress / 100, false, mProgPaint); //绘制结束位置小圆形 progressPaint.setStrokeWidth(10); progressPaint.setStyle(Paint.Style.FILL); float swipe = 360 * mProgress / 100; Log.d("=================", swipe + " mProgress"); float radians = (float) (((swipe - 90) / 2) / 180 * 2 * Math.PI); float endX; float endY; endX = centerX + circleRadius * (float) Math.cos(radians); endY = centerY + circleRadius * (float) Math.sin(radians); if (mProgress!=0) { canvas.drawCircle(endX, endY, 8, progressPaint); } } /** * 获取当前进度 * * @return 当前进度（0-100） */ public int getProgress() { return mProgress; } /** * 设置当前进度 * * @param progress 当前进度（0-100） */ public void setProgress(int progress) { this.mProgress = progress; invalidate(); } /** * 设置当前进度，并展示进度动画。如果动画时间小于等于0，则不展示动画 * * @param progress 当前进度（0-100） * @param animTime 动画时间（毫秒） */ public void setProgress(int progress, long animTime) { if (animTime <= 0) setProgress(progress); else { ValueAnimator animator = ValueAnimator.ofInt(mProgress, progress); animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { mProgress = (int) animation.getAnimatedValue(); invalidate(); } }); animator.setInterpolator(new OvershootInterpolator()); animator.setDuration(animTime); animator.start(); } } /** * 设置背景圆环宽度 * * @param width 背景圆环宽度 */ public void setBackWidth(int width) { mBackPaint.setStrokeWidth(width); invalidate(); } /** * 设置背景圆环颜色 * * @param color 背景圆环颜色 */ public void setBackColor(/*@ColorRes int color*/String color) { mBackPaint.setColor(Color.parseColor(color)); //画笔颜色 invalidate(); } /** * 设置进度圆环宽度 * * @param width 进度圆环宽度 */ public void setProgWidth(int width) { mProgPaint.setStrokeWidth(width); invalidate(); } /** * 设置进度圆环颜色 * * @param color 景圆环颜色 */ public void setProgColor(/*@ColorRes int color*/String color) { mProgPaint.setColor(Color.parseColor(color)); //画笔颜色 mProgPaint.setShader(null); invalidate(); } /** * 设置进度圆环颜色(支持渐变色) * * @param startColor 进度圆环开始颜色 * @param firstColor 进度圆环结束颜色 */ public void setProgColor(@ColorRes int startColor, @ColorRes int firstColor) { mColorArray = new int[]{ContextCompat.getColor(getContext(), startColor), ContextCompat.getColor(getContext(), firstColor)}; mProgPaint.setShader(new LinearGradient(0, 0, 0, getMeasuredWidth(), mColorArray, null, Shader.TileMode.MIRROR)); invalidate(); } /** * 设置进度圆环颜色(支持渐变色) * * @param colorArray 渐变色集合 */ public void setProgColor(@ColorRes int[] colorArray) { if (colorArray == null || colorArray.length < 2) return; mColorArray = new int[colorArray.length]; for (int index = 0; index < colorArray.length; index++) mColorArray[index] = ContextCompat.getColor(getContext(), colorArray[index]); mProgPaint.setShader(new LinearGradient(0, 0, 0, getMeasuredWidth(), mColorArray, null, Shader.TileMode.MIRROR)); invalidate(); } }

<declare-styleable name="CircularProgressView"> <attr name="backWidth" format="dimension" />  <attr name="progWidth" format="dimension" />  <attr name="progbgColor" format="color" />  <attr name="progColor" format="color" />  <attr name="progStartColor" format="color" />  <attr name="progFirstColor" format="color" />  <attr name="progress" format="integer" />  </declare-styleable>

<com.view.CircularProgressView android:layout_width="170dp" android:layout_height="170dp" android:layout_centerInParent="true" android:layout_centerHorizontal="true" app:backWidth="5dp" app:progWidth="5dp" app:progbgColor="#4C5098" app:progress="50" android:layout_marginTop="500dp" />

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