自定义View实现圆形进度条(有个点在移动)

public class Arcs extends View {    private Context context;    /*进度值*/    private int percent;    /*颜色值*/    private int mProgessColor;    /*下边的文字名称*/    private String mCustomText;    /*外圈圆环的画笔*/    private Paint paintBar = new Paint();    /*下边文字的画笔*/    private Paint paintText = new Paint();    /*动态获取属性值*/    private TypedValue typedValue;    /*先加速后减速*/    DecelerateInterpolator mDecelerateInterpolator = new DecelerateInterpolator();    /*动画持续时间*/    private int duration = 10;    private int curTime = 0;    private boolean isStart = false;    public Arcs(Context context) {        super(context);        this.context = context;        init();    }    public Arcs(Context context, AttributeSet attrs) {        super(context, attrs);        this.context = context;        init();    }    public Arcs(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        this.context = context;        init();    }    public void setPercent(int percent) {        this.percent = percent;        /*isShown()：Returns the visibility of this view and all of its ancestors*/        if (isShown()) {            /*设置进度后重新开始一次动画*/            curTime = 0;            this.invalidate();        }    }    public void setProgessColor(int mProgessColor) {        this.mProgessColor = mProgessColor;        if (isShown()) {            this.invalidate();        }    }    public void setCustomText(String mCustomText) {        this.mCustomText = mCustomText;    }    private Handler mHandler = new Handler();    private Runnable mAnimation = new Runnable() {        @Override        public void run() {            if (isStart) {                if (curTime < duration) {                    curTime++;                /*导致重绘，调用onDraw，onDraw最后调用                *  mHandler.postDelayed(mAnimation, 20);更新进度条，界面重绘                *  每100毫秒，绘制1次*/                    Arcs.this.invalidate();                    mHandler.postDelayed(mAnimation, 100);                } else {                    curTime = 0;                    isStart = false;                    Arcs.this.invalidate();                }            } else {                curTime = 0;                isStart = false;                Arcs.this.invalidate();            }        }    };    private void init() {        /*数据初始化，没有设置属性时候的默认值*/        percent = 0;        mProgessColor= Color.rgb(95, 112, 72);        mCustomText = "     ";        typedValue = new TypedValue();    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        float mWidth = getWidth();        float mHeight = getHeight();        /*下边是进度条画笔的设置*/        /** Restores the paint to its default settings. */        paintBar.reset();        /*圆环宽度4个像素*/        paintBar.setStrokeWidth(4);        /*空心圆环而非填充的额扇形*/        paintBar.setStyle(Paint.Style.STROKE);        paintBar.setAntiAlias(true);        paintBar.setStrokeCap(Paint.Cap.ROUND);        paintBar.setColor(0xff00ff);//设置进度条的颜色        /*调整下不透明度，使边框弧和进度条区分开*/        paintBar.setAlpha(80);        /*接下来是文字画笔的设置*/        paintText.setTextSize(20);        paintText.setStyle(Paint.Style.STROKE);        paintText.setAntiAlias(true);        /*从中间开始绘制文本*/        paintText.setTextAlign(Paint.Align.CENTER);        /*测量文字大小*/        Paint.FontMetrics fontMetrics = paintText.getFontMetrics();        /*计算文字高度*/        float textHeight = fontMetrics.bottom - fontMetrics.top;        /*计算圆的半径*/        float radius = Math.min(mWidth, mHeight) / 2 - 10;        /*  ❑ save：用来保存Canvas的状态。save之后，可以调用Canvas的平移、放缩、旋转、错切、裁剪等操作。            ❑ restore：用来恢复Canvas之前保存的状态。防止save后对Canvas执行的操作对后续的绘制有影响。*/        /*保存画布，绘制进度条*/        canvas.save();        /*clipRect：该方法用于裁剪画布，也就是设置画布的显示区域        调用clipRect()方法后，只会显示被裁剪的区域，之外的区域将不会显示 */        canvas.clipRect(0, 0, mWidth, mHeight / 2 + radius - textHeight * 3 / 4);        /*因为clipRect的原因，外边的圆环下边留个缺口绘制文字*/        canvas.drawCircle(mWidth / 2, mHeight / 2, radius, paintBar);        /*三角函数计算，下方缺口扇形的角度的一半*/        float theta_offset = (float) Math.acos((radius - textHeight / 2) / radius);        /*大弧围成的扇形的角度*/        float theta_full = 360 - 2 * theta_offset;        /*进度值围成的弧对应的角度*/        float thetaProcess = mDecelerateInterpolator.getInterpolation(1.0f * curTime / duration) * percent * theta_full / 100;        /*设置进度值颜色完全不透明*/        paintBar.setAlpha(255);        paintBar.setColor(mProgessColor);        float offProcess = (float) ((360 - 52.6) / duration * curTime);        /*注意弧形的起始角度，下边因显示文字导致圆环断开成一条弧，弧有左右两个端点，从左端点开始画弧*///        canvas.drawArc(new RectF(mWidth / 2 - radius, mHeight / 2 - radius, mWidth / 2 + radius, mHeight / 2 + radius), theta_offset + 90, thetaProcess, false, paintBar);        float drawX = (float) (((radius * Math.cos((offProcess + theta_offset + 26 + 90) * Math.PI / 180)) + mWidth / 2 - radius / 100 * 7) + 0.5f);        float drawY = (float) (((radius * Math.sin((offProcess + theta_offset + 26 + 90) * Math.PI / 180)) + mHeight / 2 - radius / 100 * 7) + 0.5f);        /*恢复画布*/        canvas.restore();        /*开始绘制文字*/        paintText.setTextSize(20);        fontMetrics = paintText.getFontMetrics();        float textBaseLineOffset = (fontMetrics.bottom - fontMetrics.top) / 2 - fontMetrics.bottom;        canvas.drawText(mCustomText, mWidth / 2, mHeight / 2 + radius - textHeight / 2 + textBaseLineOffset, paintText);        //设置起始点和终止点结束位置的图标//        canvas.drawBitmap(BitmapFactory.decodeResource(this.getContext().getResources(), R.mipmap.ic_launcher), mWidth / 2 - radius / 100 * 43, mHeight / 2 + radius - textHeight / 10 * 9, paintBar);//        canvas.drawBitmap(BitmapFactory.decodeResource(this.getContext().getResources(), R.mipmap.ic_launcher), mWidth / 2 + radius / 100 * 43, mHeight / 2 + radius - textHeight / 10 * 9, paintBar);        //移动的图标        canvas.drawBitmap(BitmapFactory.decodeResource(this.getContext().getResources(), R.mipmap.ic_launcher), drawX, drawY, paintBar);    }    //设置动画时间    public void setDuration(int duration) {        this.duration = duration * 10;    }    //开始动画    public void start() {        /*0.1秒后执行动画*/        isStart = true;        mHandler.postDelayed(mAnimation, 100);    }    //停止动画    public void stop() {        isStart = false;        mHandler.post(mAnimation);    }    public boolean isStart() {        return isStart;    }}