Android自定义倒计时用的圆形进度条

大概就是所有困难都是自我脑补和自我畏惧，自定义控件很早之前自己以为非常难，不愿意触碰，但是不接触就是永远不会，写多了就会了，上代码：

/**
 * @Author: WinSinMin
 * @Email: winsinmin@foxmail.com
 * @CreateDate: 2019/6/26 14:56
 * @Description: 自定义环形进度条
 */
public class CircleProgressBar extends View {
    private int currentValue = 0;
    private float alphaAngle;
    private int backColor;
    private int fillColor;
    private int circleWidth;
    private int viewWidth;
    private Paint circlePaint;
    private ValueAnimator animator;
    private RectF oval;
    private boolean isStart = false;

    public CircleProgressBar(Context context) {
        this(context, null);
    }

    public CircleProgressBar(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }


    public CircleProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.circleProgressBar, defStyleAttr, 0);
        if (ta != null) {
            fillColor = ta.getColor(R.styleable.circleProgressBar_fillColor, Color.parseColor("#DDDDDD")); // 默认底色为亮灰色
            backColor = ta.getColor(R.styleable.circleProgressBar_backColor, Color.parseColor("#FF401A")); // 默认进度条颜色为蓝色
            circleWidth = ta.getDimensionPixelSize(R.styleable.circleProgressBar_circleWidth, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 6, getResources().getDisplayMetrics())); // 默认圆弧宽度为6dp
            ta.recycle();
        }
        circlePaint = new Paint();
        circlePaint.setAntiAlias(true); // 抗锯齿
        circlePaint.setDither(true); // 防抖动
        circlePaint.setStrokeWidth(circleWidth);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int measureWidth = MeasureSpec.getSize(widthMeasureSpec);
        int measureHeight = MeasureSpec.getSize(heightMeasureSpec);
        viewWidth = Math.min(measureWidth, measureHeight);
        setMeasuredDimension(viewWidth, viewWidth);
        oval = new RectF(circleWidth / 2, circleWidth / 2, viewWidth - circleWidth / 2, viewWidth - circleWidth / 2); // 圆的外接正方形
    }

    @Override
    protected void onDraw(Canvas canvas) {
        circlePaint.setColor(backColor); // 设置底部圆环的颜色，这里使用第一种颜色
        circlePaint.setStyle(Paint.Style.STROKE); // 设置绘制的圆为空心
        canvas.drawCircle(viewWidth / 2, viewWidth / 2, viewWidth / 2 - circleWidth / 2, circlePaint); // 画底部的空心圆

        circlePaint.setColor(fillColor); // 设置圆弧的颜色
        circlePaint.setStrokeCap(Paint.Cap.ROUND); // 把每段圆弧改成圆角的
        alphaAngle = currentValue * 1.0f; // 计算每次画圆弧时扫过的角度，这里计算要注意分母要转为float类型，否则alphaAngle永远为0
        canvas.drawArc(oval, -90, alphaAngle, false, circlePaint);
    }


    public void startProgress(long duration) {
        if (isStart)
            return;
        animator = ValueAnimator.ofInt(0, 360);
        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                currentValue = (int) animation.getAnimatedValue();
                invalidate();
            }
        });
        animator.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animation) {

            }

            @Override
            public void onAnimationEnd(Animator animation) {
                isStart = false;
            }

            @Override
            public void onAnimationCancel(Animator animation) {

            }

            @Override
            public void onAnimationRepeat(Animator animation) {

            }
        });
        animator.setInterpolator(new LinearInterpolator());
        animator.setDuration(duration);
        animator.start();
        isStart = true;
    }

    public void cancel() {
        if (animator != null || animator.isRunning()) {
            animator.cancel();
            isStart = false;
        }
    }

    public void pause() {
        if (animator != null || animator.isRunning()) {
            animator.pause();
        }
    }

    public void resume() {
        if (animator != null || animator.isPaused()) {
            animator.resume();
        }
    }
}

attrs文件中新增

 <declare-styleable name="circleProgressBar">
          <attr name="circleWidth" format="dimension" />
        <attr name="fillColor" format="reference|color" />
        <attr name="backColor" format="reference|color" />
    </declare-styleable>

调用的话直接调用startProgress就行了。