headview 需要自己设置layoutparams才能填充父布局

[simplepeng]

like this :
public void addHeaderView(View header) {

    if (header == null) {
        throw new RuntimeException("header is null");
    }
    header.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT
            ,ViewGroup.LayoutParams.WRAP_CONTENT));
    mHeaderViews.add(header);
    this.notifyDataSetChanged();

[Ezioer]

关于这个困扰了我一下午 多谢大神的解答