1.首先要自定义一个继承gridview的类

public class MyGridView extends GridView {    public boolean hasScrollBar = true;    public MyGridView(Context context) {        super(context);    }    public MyGridView(Context context, AttributeSet attrs) {        super(context, attrs);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,MeasureSpec.AT_MOST);        super.onMeasure(widthMeasureSpec, expandSpec);    }}

2.在布局中引用这个自定义gridview