自定义画图 和曲线

ublic class MyView extends View {
    public MyView(Context context) {
        super(context);
    }

    public MyView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public MyView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    //5.0以上 4个构造函数 以下 3个构造函数
//    public MyView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
//        super(context, attrs, defStyleAttr, defStyleRes);
//    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //画笔 大小 颜色 填充 去锯齿
        Paint paint = new Paint();
        paint.setTextSize(20);//db
        //非抗锯齿
        paint.setAntiAlias(false);
        //蓝颜色
        paint.setColor(Color.BLUE);
        //填充并且填充
        paint.setStyle(Paint.Style.FILL_AND_STROKE);
        //cx x轴 cy y轴 radius 半径 paint 画笔
        canvas.drawCircle(100, 100, 100, paint);

        //非抗锯齿
        paint.setAntiAlias(true);
        //蓝颜色
        paint.setColor(Color.RED);
        //cx x轴 cy y轴 radius 半径 paint 画笔
        canvas.drawCircle(450, 450, 200, paint);
        //通过BitmapFactory的decodeResource方法将图片资源转化为bitmap
        Bitmap biamap = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);
        //绘制图片
        canvas.drawBitmap(biamap, 600, 600, paint);

        //left 左 X 轴 top 上 Y 轴 right X 轴 右 bottom Y 轴下 4个坐标点
        RectF rectF = new RectF(750, 650, 1050, 950);
        //绘制个矩形
        canvas.drawRect(rectF, paint);

        paint.setTextSize(30);//db
        //绘制个文字
        //text 字符串 x X 轴 y Y轴 paint 画笔
        canvas.drawText("这是自定义的View绘制出的文本", 300, 800, paint);
        paint = new Paint();
        //重新设置patint属性
        paint.reset();
        //画笔大小
        paint.setTextSize(60);//db
        //画笔宽度
        paint.setStrokeWidth(330);
        //颜色
        paint.setColor(Color.RED);
        paint.setStyle(Paint.Style.STROKE);
        //绘制六边形
        Path path = new Path();
        //起始位置 x y 轴坐标点
        path.moveTo(180, 200);
        //连线
        path.lineTo(200, 200);
        path.lineTo(200, 200);
        path.lineTo(210, 210);
        path.lineTo(200, 220);
        path.lineTo(180, 220);
        path.lineTo(170, 210);
        //封闭
        path.close();
        canvas.drawPath(path, paint);

    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int x;
        int y;
        return true;
    }
}