效果图:

 

1.自定义HeartDashBoardView

/**
 * 刻度仪表盘
 */
public class HeartDashBoardView extends View {
    private static final float START_ANGLE = 135f;
    private static final float MAX_ANGLE = 270f;
    private float progress = 0;
    private float centerX;
    private float centerY;
    private float width;
    private float height;
    private int lineWidth = dp2px(8); // 绘制圆环的线宽
    private int pointWidth = dp2px(2); // 绘制圆点线宽

    private SweepGradient sweepGradient;

    private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    private Paint pointPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    private ObjectAnimator animator;

    private int[] colors = {
            Color.parseColor("#09F5E6"),
            Color.parseColor("#09F5E6"),//浅色
            Color.parseColor("#23F2A4"),
            Color.parseColor("#40EF59"),
            Color.parseColor("#7EED26"),
            Color.parseColor("#B7EC15"),
            Color.parseColor("#FFE300"),
            Color.parseColor("#FF0B00"),
            Color.parseColor("#FF0000"),//深色
    };

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

    public HeartDashBoardView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public HeartDashBoardView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        paint.setColor(Color.GRAY);
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeCap(Paint.Cap.ROUND);
        paint.setStrokeWidth(lineWidth);

        pointPaint.setColor(Color.WHITE);
        pointPaint.setStyle(Paint.Style.STROKE);
        pointPaint.setStrokeWidth(pointWidth);
    }

    private void setProgress(float progress) {
        this.progress = progress;
        invalidate();
    }

    public void setHeartProgress(float progress) {
        animator = ObjectAnimator.ofFloat(this, "progress", 0, progress);
        animator.setDuration(2000);
        animator.setInterpolator(new FastOutSlowInInterpolator());
        animator.start();
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        width = getWidth();
        height = getHeight();
        centerX = getWidth() / 2;
        centerY = getHeight() / 2;
        sweepGradient = new SweepGradient(centerX, centerY, colors, null);
        //改变开始渐变的角度(默认从右边开始画圆渐变,旋转90度就从下方开始画圆渐变,旋转之后更好设置颜色渐变值)
        Matrix matrix = new Matrix();
        matrix.setRotate(90, centerX, centerY);
        sweepGradient.setLocalMatrix(matrix);
        paint.setShader(sweepGradient);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        // 绘制环形
        drawArc(canvas);
        // 绘制末尾圆点
        drawPoint(canvas);
    }

    private void drawArc(Canvas canvas) {
        int padding = lineWidth + pointWidth;
        canvas.drawArc(padding, padding, width - padding, height - padding, START_ANGLE, MAX_ANGLE, false, paint);
    }

    private void drawPoint(Canvas canvas) {
        Path path = new Path();
        float sweepAngle = MAX_ANGLE * progress / 100;
        int padding = lineWidth + pointWidth;
        path.addArc(padding, padding, width - padding, height - padding, START_ANGLE, sweepAngle);
        PathMeasure measure = new PathMeasure(path, false);
        float[] pos = new float[2];
        measure.getPosTan(measure.getLength() - 1, pos, null);
        pointPaint.setColor(Color.parseColor("#FF7968"));
        pointPaint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(pos[0], pos[1], lineWidth - pointWidth, pointPaint);

        pointPaint.setColor(Color.WHITE);
        pointPaint.setStyle(Paint.Style.STROKE);
        canvas.drawCircle(pos[0], pos[1], lineWidth - pointWidth, pointPaint);
    }

    public int dp2px(final float dpValue) {
        final float scale = Resources.getSystem().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }
}

2.布局中使用

            <com.hwd.flowfit.ui.widget.HeartDashBoardView
                android:id="@+id/heartChart"
                android:layout_width="130dp"
                android:layout_height="130dp"
                android:layout_marginStart="30dp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

3.设置进度

heartChart.setHeartProgress(30F)