ListView监听上下滑动判断是否显示返回顶部按钮

【Android】ListView监听上下滑动（判断是否显示返回顶部按钮）

/** Automatically generated file. DO NOT MODIFY */
package com.zihao.activity;

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

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

     文件        459  2015-01-04 11:00  ListViewDemo\.classpath

     文件        848  2015-01-04 11:00  ListViewDemo\.project

     文件        177  2015-01-04 11:00  ListViewDemo\.settings\org.eclipse.jdt.core.prefs

     文件        949  2015-01-04 14:31  ListViewDemo\AndroidManifest.xml

     文件        949  2015-01-04 15:14  ListViewDemo\bin\AndroidManifest.xml

     文件        345  2015-01-04 15:14  ListViewDemo\bin\classes\com\zihao\activity\BuildConfig.class

     文件       2114  2015-01-04 15:14  ListViewDemo\bin\classes\com\zihao\activity\MainActivity$1.class

     文件       3608  2015-01-04 15:14  ListViewDemo\bin\classes\com\zihao\activity\MainActivity.class

     文件        340  2015-01-04 15:14  ListViewDemo\bin\classes\com\zihao\activity\R$attr.class

     文件        461  2015-01-04 15:14  ListViewDemo\bin\classes\com\zihao\activity\R$dimen.class

     文件        441  2015-01-04 15:14  ListViewDemo\bin\classes\com\zihao\activity\R$drawable.class

     文件        491  2015-01-04 15:14  ListViewDemo\bin\classes\com\zihao\activity\R$id.class

     文件        438  2015-01-04 15:14  ListViewDemo\bin\classes\com\zihao\activity\R$layout.class

     文件        388  2015-01-04 15:14  ListViewDemo\bin\classes\com\zihao\activity\R$menu.class

     文件        472  2015-01-04 15:14  ListViewDemo\bin\classes\com\zihao\activity\R$string.class

     文件        431  2015-01-04 15:14  ListViewDemo\bin\classes\com\zihao\activity\R$style.class

     文件        673  2015-01-04 15:14  ListViewDemo\bin\classes\com\zihao\activity\R.class

     文件        946  2015-01-04 15:14  ListViewDemo\bin\classes\com\zihao\adapter\MyAdapter$ViewHolder.class

     文件       2455  2015-01-04 15:14  ListViewDemo\bin\classes\com\zihao\adapter\MyAdapter.class

     文件       1479  2015-01-04 15:14  ListViewDemo\bin\classes\com\zihao\utils\ScreenUtil.class

     文件        160  2015-01-04 15:14  ListViewDemo\gen\com\zihao\activity\BuildConfig.java

     文件       2332  2015-01-04 15:14  ListViewDemo\gen\com\zihao\activity\R.java

     文件      51394  2015-01-04 11:00  ListViewDemo\ic_launcher-web.png

     文件     621451  2015-01-04 11:00  ListViewDemo\libs\android-support-v4.jar

     文件        781  2015-01-04 11:00  ListViewDemo\proguard-project.txt

     文件        563  2015-01-04 11:00  ListViewDemo\project.properties

     文件       7658  2015-01-04 11:00  ListViewDemo\res\drawable-hdpi\ic_launcher.png

     文件      16068  2015-01-04 11:04  ListViewDemo\res\drawable-hdpi\top_btn_bg.png

     文件       3777  2015-01-04 11:00  ListViewDemo\res\drawable-mdpi\ic_launcher.png

     文件      12516  2015-01-04 11:00  ListViewDemo\res\drawable-xhdpi\ic_launcher.png

............此处省略48个文件信息