Android怎么自定义View实现圆弧进度效果

public ArcView(Context context) { this(context,null); } public ArcView(Context context, @Nullable AttributeSet attrs) { this(context, attrs,0); } public ArcView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); //init(); }

@SuppressLint("DrawAllocation") @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); centerX=getWidth()/2; centerY=getHeight()/2; //初始化paint initPaint(); //绘制弧度 drawArc(canvas); //绘制文本 drawText(canvas); } 注：这里的paint初始化我放在了onDraw方法中进行的，当然你也可以放在有三个参数的构造方法中初始化。

//圆弧的paint mArcPaint=new Paint(Paint.ANTI_ALIAS_FLAG); //抗锯齿 mArcPaint.setAntiAlias(true); mArcPaint.setColor(Color.parseColor("#666666")); //设置透明度（数值为0-255） mArcPaint.setAlpha(100); //设置画笔的画出的形状 mArcPaint.setStrokeJoin(Paint.Join.ROUND); mArcPaint.setStrokeCap(Paint.Cap.ROUND); //设置画笔类型 mArcPaint.setStyle(Paint.Style.STROKE); mArcPaint.setStrokeWidth(dp2px(mStrokeWith));

//中心文字的paint mTextPaint=new Paint(); mTextPaint.setAntiAlias(true); mTextPaint.setColor(Color.parseColor("#FF4A40")); //设置文本的对齐方式 mTextPaint.setTextAlign(Paint.Align.CENTER); //mTextPaint.setTextSize(getResources().getDimensionPixelSize(R.dimen.dp_12)); mTextPaint.setTextSize(dp2px(25));

/** * 绘制圆弧 * @param canvas */ private void drawArc(Canvas canvas) { //绘制圆弧背景 RectF mRectF=new RectF(mStrokeWith+dp2px(5),mStrokeWith+dp2px(5),getWidth()-mStrokeWith-dp2px(5),getHeight()-mStrokeWith); canvas.drawArc(mRectF,startAngle,mAngle,false,mArcPaint); //绘制当前数值对应的圆弧 mArcPaint.setColor(Color.parseColor("#FF4A40")); //根据当前数据绘制对应的圆弧 canvas.drawArc(mRectF,startAngle,mIncludedAngle,false,mArcPaint); }

/** * 绘制文本 * @param canvas */ private void drawText(Canvas canvas) { Rect mRect=new Rect(); String mValue=String.valueOf(mAnimatorValue); //绘制中心的数值 mTextPaint.getTextBounds(mValue,0,mValue.length(),mRect); canvas.drawText(String.valueOf(mAnimatorValue),centerX,centerY+mRect.height(),mTextPaint); //绘制中心文字描述 mTextPaint.setColor(Color.parseColor("#999999")); mTextPaint.setTextSize(dp2px(12)); mTextPaint.getTextBounds(mDes,0,mDes.length(),mRect); canvas.drawText(mDes,centerX,centerY+2*mRect.height()+dp2px(10),mTextPaint); //绘制最小值 String minValue=String.valueOf(mMinValue); String maxValue=String.valueOf(mMaxValue); mTextPaint.setTextSize(dp2px(18)); mTextPaint.getTextBounds(minValue,0,minValue.length(),mRect); canvas.drawText(minValue, (float) (centerX-0.6*centerX-dp2px(5)), (float) (centerY+0.75*centerY+mRect.height()+dp2px(5)),mTextPaint); //绘制最大值 mTextPaint.getTextBounds(maxValue,0,maxValue.length(),mRect); canvas.drawText(maxValue, (float) (centerX+0.6*centerX+dp2px(5)), (float) (centerY+0.75*centerY+mRect.height()+dp2px(5)),mTextPaint); }

/** * 为绘制弧度及数据设置动画 * * @param startAngle 开始的弧度 * @param currentAngle 需要绘制的弧度 * @param currentValue 需要绘制的数据 * @param time 动画执行的时长 */ private void setAnimation(float startAngle, float currentAngle,int currentValue, int time) { //绘制当前数据对应的圆弧的动画效果 ValueAnimator progressAnimator = ValueAnimator.ofFloat(startAngle, currentAngle); progressAnimator.setDuration(time); progressAnimator.setTarget(mIncludedAngle); progressAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { mIncludedAngle = (float) animation.getAnimatedValue(); //重新绘制，不然不会出现效果 postInvalidate(); } }); //开始执行动画 progressAnimator.start(); //中心数据的动画效果 ValueAnimator valueAnimator = ValueAnimator.ofInt(mAnimatorValue, currentValue); valueAnimator.setDuration(2500); valueAnimator.setInterpolator(new LinearInterpolator()); valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { mAnimatorValue = (int) valueAnimator.getAnimatedValue(); postInvalidate(); } }); valueAnimator.start(); }

/** * 设置数据 * @param minValue 最小值 * @param maxValue 最大值 * @param currentValue 当前绘制的值 * @param des 描述信息 */ public void setValues(int minValue,int maxValue, int currentValue,String des) { mDes=des; mMaxValue=maxValue; mMinValue=minValue; //完全覆盖背景弧度 if (currentValue maxValue) { currentValue = maxValue; } //计算弧度比重 float scale = (float) currentValue / maxValue; //计算弧度 float currentAngle = scale * mAngle; //开始执行动画 setAnimation(0, currentAngle, currentValue,2500);

/** * 自定义的圆弧形view */ public class ArcView extends View { //根据数据显示的圆弧Paint private Paint mArcPaint; //文字描述的paint private Paint mTextPaint; //圆弧开始的角度 private float startAngle=135; //圆弧结束的角度 private float endAngle=45; //圆弧背景的开始和结束间的夹角大小 private float mAngle=270; //当前进度夹角大小 private float mIncludedAngle=0; //圆弧的画笔的宽度 private float mStrokeWith=10; //中心的文字描述 private String mDes=""; //动画效果的数据及最大/小值 private int mAnimatorValue,mMinValue,mMaxValue; //中心点的XY坐标 private float centerX,centerY; public ArcView(Context context) { this(context,null); } public ArcView(Context context, @Nullable AttributeSet attrs) { this(context, attrs,0); } public ArcView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); //init(); } private void initPaint() { //圆弧的paint mArcPaint=new Paint(Paint.ANTI_ALIAS_FLAG); //抗锯齿 mArcPaint.setAntiAlias(true); mArcPaint.setColor(Color.parseColor("#666666")); //设置透明度（数值为0-255） mArcPaint.setAlpha(100); //设置画笔的画出的形状 mArcPaint.setStrokeJoin(Paint.Join.ROUND); mArcPaint.setStrokeCap(Paint.Cap.ROUND); //设置画笔类型 mArcPaint.setStyle(Paint.Style.STROKE); mArcPaint.setStrokeWidth(dp2px(mStrokeWith)); //中心文字的paint mTextPaint=new Paint(); mTextPaint.setAntiAlias(true); mTextPaint.setColor(Color.parseColor("#FF4A40")); //设置文本的对齐方式 mTextPaint.setTextAlign(Paint.Align.CENTER); //mTextPaint.setTextSize(getResources().getDimensionPixelSize(R.dimen.dp_12)); mTextPaint.setTextSize(dp2px(25)); } @SuppressLint("DrawAllocation") @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); centerX=getWidth()/2; centerY=getHeight()/2; //初始化paint initPaint(); //绘制弧度 drawArc(canvas); //绘制文本 drawText(canvas); } /** * 绘制文本 * @param canvas */ private void drawText(Canvas canvas) { Rect mRect=new Rect(); String mValue=String.valueOf(mAnimatorValue); //绘制中心的数值 mTextPaint.getTextBounds(mValue,0,mValue.length(),mRect); canvas.drawText(String.valueOf(mAnimatorValue),centerX,centerY+mRect.height(),mTextPaint); //绘制中心文字描述 mTextPaint.setColor(Color.parseColor("#999999")); mTextPaint.setTextSize(dp2px(12)); mTextPaint.getTextBounds(mDes,0,mDes.length(),mRect); canvas.drawText(mDes,centerX,centerY+2*mRect.height()+dp2px(10),mTextPaint); //绘制最小值 String minValue=String.valueOf(mMinValue); String maxValue=String.valueOf(mMaxValue); mTextPaint.setTextSize(dp2px(18)); mTextPaint.getTextBounds(minValue,0,minValue.length(),mRect); canvas.drawText(minValue, (float) (centerX-0.6*centerX-dp2px(5)), (float) (centerY+0.75*centerY+mRect.height()+dp2px(5)),mTextPaint); //绘制最大指 mTextPaint.getTextBounds(maxValue,0,maxValue.length(),mRect); canvas.drawText(maxValue, (float) (centerX+0.6*centerX+dp2px(5)), (float) (centerY+0.75*centerY+mRect.height()+dp2px(5)),mTextPaint); } /** * 绘制当前的圆弧 * @param canvas */ private void drawArc(Canvas canvas) { //绘制圆弧背景 RectF mRectF=new RectF(mStrokeWith+dp2px(5),mStrokeWith+dp2px(5),getWidth()-mStrokeWith-dp2px(5),getHeight()-mStrokeWith); canvas.drawArc(mRectF,startAngle,mAngle,false,mArcPaint); //绘制当前数值对应的圆弧 mArcPaint.setColor(Color.parseColor("#FF4A40")); //根据当前数据绘制对应的圆弧 canvas.drawArc(mRectF,startAngle,mIncludedAngle,false,mArcPaint); } /** * 为绘制弧度及数据设置动画 * * @param startAngle 开始的弧度 * @param currentAngle 需要绘制的弧度 * @param currentValue 需要绘制的数据 * @param time 动画执行的时长 */ private void setAnimation(float startAngle, float currentAngle,int currentValue, int time) { //绘制当前数据对应的圆弧的动画效果 ValueAnimator progressAnimator = ValueAnimator.ofFloat(startAngle, currentAngle); progressAnimator.setDuration(time); progressAnimator.setTarget(mIncludedAngle); progressAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { mIncludedAngle = (float) animation.getAnimatedValue(); //重新绘制，不然不会出现效果 postInvalidate(); } }); //开始执行动画 progressAnimator.start(); //中心数据的动画效果 ValueAnimator valueAnimator = ValueAnimator.ofInt(mAnimatorValue, currentValue); valueAnimator.setDuration(2500); valueAnimator.setInterpolator(new LinearInterpolator()); valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { mAnimatorValue = (int) valueAnimator.getAnimatedValue(); postInvalidate(); } }); valueAnimator.start(); } /** * 设置数据 * @param minValue 最小值 * @param maxValue 最大值 * @param currentValue 当前绘制的值 * @param des 描述信息 */ public void setValues(int minValue,int maxValue, int currentValue,String des) { mDes=des; mMaxValue=maxValue; mMinValue=minValue; //完全覆盖 if (currentValue maxValue) { currentValue = maxValue; } //计算弧度比重 float scale = (float) currentValue / maxValue; //计算弧度 float currentAngle = scale * mAngle; //开始执行动画 setAnimation(0, currentAngle, currentValue,2500); } public float dp2px(float dp) { DisplayMetrics metrics = Resources.getSystem().getDisplayMetrics(); return dp * metrics.density; } }

技术实现

1.继承自View

2.Paint初始化

3.Canvas绘制

4.添加动画效果及数据

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