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当您在onMeasure方法中创建自定义组件时,可以指定大小甚至缩进(通过使用this.getPaddingTop()等)。问题是onMeasure的计算方法是否得到值“ margin ...”?鉴于不欢迎在 onMeasure 中使用“this.getLayoutParams ()”方法 - 请给出正确的规范解决方案来设置/获取“ margin ...”的值。

例子:

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        int wSpecMode = MeasureSpec.getMode( widthMeasureSpec );
        int wSpecSize = MeasureSpec.getSize( widthMeasureSpec );
        int hSpecMode = MeasureSpec.getMode( heightMeasureSpec );
        int hSpecSize = MeasureSpec.getSize( heightMeasureSpec );
        int lMargin = ((RelativeLayout.LayoutParams)this.getLayoutParams()).leftMargin;
        int rMargin = ((RelativeLayout.LayoutParams)this.getLayoutParams()).rightMargin;
        int tMargin = ((RelativeLayout.LayoutParams)this.getLayoutParams()).topMargin;
        int bMargin = ((RelativeLayout.LayoutParams)this.getLayoutParams()).bottomMargin;
        int wSize = 256, hSize = 256;

        if (wSpecMode == MeasureSpec.EXACTLY) {
            wSize = wSpecSize;
        } else {
            wSize += this.getPaddingLeft() + this.getPaddingRight() + lMargin + rMargin;

            if (wSpecMode == MeasureSpec.AT_MOST) {
                wSize = Math.min(wSize, wSpecSize);
            }
        }

        if (hSpecMode == MeasureSpec.EXACTLY) {
            hSize = hSpecSize;
        } else {
            hSize += this.getPaddingTop() + this.getPaddingBottom() + tMargin + bMargin;

            if (hSpecMode == MeasureSpec.AT_MOST) {
                hSize = Math.min(hSize, hSpecSize);
            }
        }
        this.setMeasuredDimension( wSize, hSize );
    }

在这个例子中,计算的均值可以,我们已经考虑了边距和填充,但是获取边距的方法不太优雅。

此外,这种方法区域组件在相同的边距上变得更多,并且通过getMeasuredWidth()getMeasuredHeight()获得尺寸- 计算不正确。

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