android - onMeasure没有在我的自定义viewgroup android中调用

我有两个自定义的viewgroups，superViewGroup和subViewGroup。子视图组包含视图。我正在将我的SuperviewGroup添加到LinearLayout，并将subViewGroups添加到我的superviewgroup。
正在调用SuperviewGrouponMeasure()，但不在子ViewGroup中。但在这两种情况下都会调用onLayout()方法。
代码如下

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());

            }
        }


    }


}

欢迎评论。提前谢谢。

最佳答案

因为您必须将度量值实际传递给子视图：

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

    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)
        }
    }
}

否则你永远不会真正测量你的孩子。如何做到这一点取决于你自己。就因为你的SuperViewGroup是线性布局，你的SuperViewGroup就有责任测量它的孩子。