在ScrollView中自定义GridView无法显示全部的问题的解决

新建类，继承自GridView，重写onMeasure()方法

public class MyGridView extends GridView {
     public MyGridView(Context context, AttributeSet attrs) {
          super(context, attrs);
     }

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

     public MyGridView(Context context, AttributeSet attrs, int defStyle) {
          super(context, attrs, defStyle);
     }

     /**
     * 解决ScrollView嵌套GridView时GridView显示不全问题
     */
     @Override
     public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
          super.onMeasure(widthMeasureSpec, expandSpec);
     }
}