MyView2.java 文件源码

/**
 * 画扇形
 *
 * @param canvas
 */
private void drawArc(Canvas canvas) {
    Paint paint = new Paint();
    paint.setStyle(Paint.Style.STROKE);
    paint.setColor(Color.RED);
    paint.setAntiAlias(true);
    float x = (getWidth() - getHeight() / 2) / 2;
    float y = getHeight() / 4;

    RectF oval = new RectF(x, y,
            getWidth() - x, getHeight() - y);
    canvas.drawRect(oval, paint);

    Paint paint_over = new Paint();
    paint_over.setStyle(Paint.Style.FILL);
    paint_over.setColor(Color.BLUE);

    canvas.drawArc(oval, -90, 90, true, paint_over);//其中的参数 ： RectF oval 一个矩形  , float startAngle 开始的偏移量 正数代表顺时针  负数代表逆时针, float sweepAngle  画圈的大下, boolean useCenter 是否连接到圆心,@NonNull Paint paint
}