view的生命周期方法：

/**
 *当View中所有的子控件均被映射成xml后触发
 */
@Override
protected void onFinishInflate() {
    super.onFinishInflate();
    Log.e("flag","onFinishInflate");
}

/**
 * 当view被附着到一个窗口时触发
 */
@Override
protected void onAttachedToWindow() {
    Log.e("flag","onAttachedToWindow");
    super.onAttachedToWindow();
}
/**
 * 当窗口中包含的可见的view发生变化时触发
 * @param visibility
 */
@Override
protected void onWindowVisibilityChanged(int visibility) {
    Log.e("flag","onWindowVisibilityChanged");
    super.onWindowVisibilityChanged(visibility);
}

/**
 * 测量控件的宽高    生命周期
 * @param widthMeasureSpec
 * @param heightMeasureSpec
 */
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    Log.e("flag","onMeasure");
    /**
     * 如果我们想要的type是圆形，则我们需要让宽高一致，以较小的值为准、
     */
    if(type == TYPE_CIRCLE){
        mWinth = Math.min(getMeasuredWidth(),getMeasuredHeight());
        mRadius = mWinth /2;
        setMeasuredDimension(mWinth, mWinth);
    }
}

/**
 * 当大小改变的时候调用这个方法，最少调用一次
 * @param w
 * @param h
 * @param oldw
 * @param oldh
 */
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    Log.e("flag","onSizeChanged");
    super.onSizeChanged(w, h, oldw, oldh);
    if(type == TYPE_ROUND){
        rectF = new RectF(0,0,w,h);

    }
}

/**
 * 当view分配所有子元素的大小和位置时触发
 * @param changed
 * @param left
 * @param top
 * @param right
 * @param bottom
 */
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
    super.onLayout(changed, left, top, right, bottom);
    Log.e("flag","onLayout");
}


@Override
protected void onDraw(Canvas canvas) {
    //  super.onDraw(canvas);  一定要注意，把这个方法去点
    //  Log.e("flag","onSizeChanged");
    Log.e("flag", "onDraw");
    if (getDrawable() == null) {
        return;
    }
    //  canvas.drawRect();
    setUpShader();

    if (type == TYPE_ROUND) {
        canvas.drawRoundRect(rectF, mBorderRadius, mBorderRadius,
                mBitmapPaint);
    } else {
        canvas.drawCircle(mRadius, mRadius, mRadius, mBitmapPaint);
        // drawSomeThing(canvas);
    }
}

/**
 * 当view离开附着的窗口时触发
 */
@Override
protected void onDetachedFromWindow() {
    Log.e("flag","onDetachedFromWindow");
    super.onDetachedFromWindow();
}

log日志如下：

06-18 22:08:27.613 18990-18990/com.qkhl.mycustomerview E/flag: onFinishInflate
06-18 22:08:27.629 18990-18990/com.qkhl.mycustomerview E/flag: onAttachedToWindow
06-18 22:08:27.629 18990-18990/com.qkhl.mycustomerview E/flag: onWindowVisibilityChanged
06-18 22:08:27.630 18990-18990/com.qkhl.mycustomerview E/flag: onMeasure
06-18 22:08:27.641 18990-18990/com.qkhl.mycustomerview E/flag: onMeasure
06-18 22:08:27.676 18990-18990/com.qkhl.mycustomerview E/flag: onSizeChanged
06-18 22:08:27.676 18990-18990/com.qkhl.mycustomerview E/flag: onLayout
06-18 22:08:27.679 18990-18990/com.qkhl.mycustomerview E/flag: onWindowFocusChanged
06-18 22:08:27.682 18990-18990/com.qkhl.mycustomerview E/flag: onMeasure
06-18 22:08:27.683 18990-18990/com.qkhl.mycustomerview E/flag: onMeasure
06-18 22:08:27.683 18990-18990/com.qkhl.mycustomerview E/flag: onLayout
06-18 22:08:27.683 18990-18990/com.qkhl.mycustomerview E/flag: onDraw
06-18 22:08:31.787 18990-18990/com.qkhl.mycustomerview E/flag: onWindowFocusChanged
06-18 22:08:32.044 18990-18990/com.qkhl.mycustomerview E/flag: onWindowVisibilityChanged
06-18 22:08:32.205 18990-18990/com.qkhl.mycustomerview E/flag: onDetachedFromWindow