listview嵌gridview，并实现grid元素部分显示以及点击展开与折叠

有时我们需要用GridView显示目录列表，有时甚至是二级的，即listview每一个item里面又各自嵌入一个gridview，但是当二级目录（数据条目）的数量过多时，界面会比较臃肿，这时我们就想要有类似展开与折叠的效果，作者采用的策略是数据分段的分别显示，其中对于显示边界（处于限制显示数目的特定位置）的控件要有数据的动态更新和点击判断操作。

/** Automatically generated file. DO NOT MODIFY */
package com.example.gridinlist;

public final class BuildConfig {
    public final static boolean DEBUG = true;
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件        475  2015-11-02 11:34  GridinList-ClicktoFolder&Collapse\.classpath

     文件        846  2015-11-02 11:30  GridinList-ClicktoFolder&Collapse\.project

     文件        150  2015-11-02 12:00  GridinList-ClicktoFolder&Collapse\.settings\org.eclipse.core.resources.prefs

     文件        177  2015-11-02 11:30  GridinList-ClicktoFolder&Collapse\.settings\org.eclipse.jdt.core.prefs

     文件        864  2015-11-02 11:34  GridinList-ClicktoFolder&Collapse\AndroidManifest.xml

     文件        864  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\bin\AndroidManifest.xml

     文件        353  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\bin\classes\com\example\gridinlist\BuildConfig.class

     文件       1447  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\bin\classes\com\example\gridinlist\MainActivity.class

     文件       2873  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\bin\classes\com\example\gridinlist\MyAdapter$1.class

     文件       3252  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\bin\classes\com\example\gridinlist\MyAdapter$2.class

     文件       1352  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\bin\classes\com\example\gridinlist\MyAdapter$ViewHolder.class

     文件       6314  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\bin\classes\com\example\gridinlist\MyAdapter.class

     文件        814  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\bin\classes\com\example\gridinlist\MyGridView.class

     文件        352  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\bin\classes\com\example\gridinlist\R$attr.class

     文件        562  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\bin\classes\com\example\gridinlist\R$drawable.class

     文件        633  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\bin\classes\com\example\gridinlist\R$id.class

     文件        495  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\bin\classes\com\example\gridinlist\R$layout.class

     文件        445  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\bin\classes\com\example\gridinlist\R$string.class

     文件        443  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\bin\classes\com\example\gridinlist\R$style.class

     文件        611  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\bin\classes\com\example\gridinlist\R.class

     文件        164  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\gen\com\example\gridinlist\BuildConfig.java

     文件       2627  2015-11-02 14:54  GridinList-ClicktoFolder&Collapse\gen\com\example\gridinlist\R.java

     文件      51394  2015-11-02 11:30  GridinList-ClicktoFolder&Collapse\ic_launcher-web.png

     文件     995624  2015-11-02 11:30  GridinList-ClicktoFolder&Collapse\libs\android-support-v4.jar

     文件        781  2015-11-02 11:30  GridinList-ClicktoFolder&Collapse\proguard-project.txt

     文件        563  2015-11-02 11:30  GridinList-ClicktoFolder&Collapse\project.properties

     文件        511  2015-11-02 13:32  GridinList-ClicktoFolder&Collapse\res\drawable\btn_txt_bg.xml

     文件       2948  2015-11-02 11:35  GridinList-ClicktoFolder&Collapse\res\drawable-hdpi\btn_normal.png

     文件       2947  2015-11-02 11:35  GridinList-ClicktoFolder&Collapse\res\drawable-hdpi\btn_selected.png

     文件       7658  2015-11-02 11:30  GridinList-ClicktoFolder&Collapse\res\drawable-hdpi\ic_launcher.png

............此处省略46个文件信息