Question

采用两种惯例<代码>viewgroups,superViewGroup和。分组载有意见。在我的<代码>上添加我的超见组,加入行文和<编码>代号<>。

超级调查组<代码>onMeasure(>)正在被称作,但没有列入次调查组。但是,在这两种情况下,<代码>onLayout(>”方法都被称作。

守则如下:

public class SuperViewGroup extends ViewGroup{

    public SuperViewGroup(Context context) {
        super(context);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        Log.i("boxchart","INSIDE ON MEASURE SUPER VIEWGROUP");
    }



    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {

        final int count = getChildCount();

        for (int i = 0; i < count; i++) {
            final View child = getChildAt(i);
            if (child.getVisibility() != View.GONE) {
                child.layout(0, 0, getWidth(), getHeight());

            }
        }


    }


}


public class SubViewGroup extends ViewGroup{

    public SubViewGroup(Context context) {
        super(context);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        Log.i("boxchart","INSIDE ON MEASURE SUB VIEWGROUP");
    }



    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {

        final int count = getChildCount();

        for (int i = 0; i < count; i++) {
            final View child = getChildAt(i);
            if (child.getVisibility() != View.GONE) {
                child.layout(0, 0, getWidth(), getHeight());

            }
        }


    }


}

赞赏评论。预先感谢。

Answer 1

由于你实际上必须把这一措施传给子女:

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    Log.i("boxchart","INSIDE ON MEASURE SUPER VIEWGROUP");
    final int count = getChildCount();
    for (int i = 0; i < count; i++) {
        final View child = getChildAt(i);
        if (child.getVisibility() != View.GONE) {
            //Make or work out measurements for children here (MeasureSpec.make...)
            measureChild (child, widthMeasureSpec, heightMeasureSpec);
        }
    }
}

Otherwise you never actually measure your children. It is up to you to decide how to do this. Just because your SuperViewGroup is in a linear layout, your SuperViewGroup takes on responsibility to measure its children.

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