Found 4 versions of android-support-v4.jar in the dependency list.

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android中引入多个library时，出现如下问题：

[2015-04-30 14:21:06 - PullToRefresh_Sample] Found 4 versions of android-support-v4.jar in the dependency list,
[2015-04-30 14:21:06 - PullToRefresh_Sample] but not all the versions are identical (check is based on SHA-1 only at this time).
[2015-04-30 14:21:06 - PullToRefresh_Sample] All versions of the libraries must be the same at this time.
[2015-04-30 14:21:06 - PullToRefresh_Sample] Versions found are:
[2015-04-30 14:21:06 - PullToRefresh_Sample] Path: F:\Android\appcompat_v7\libs\android-support-v4.jar
[2015-04-30 14:21:06 - PullToRefresh_Sample] Length: 758727
[2015-04-30 14:21:06 - PullToRefresh_Sample] SHA-1: efec67655f6db90757faa37201efcee2a9ec3507
[2015-04-30 14:21:06 - PullToRefresh_Sample] Path: F:\Android\pullToRefresh_libs\extras\PullToRefreshViewPager\libs\android-support-v4.jar
[2015-04-30 14:21:06 - PullToRefresh_Sample] Length: 349252
[2015-04-30 14:21:06 - PullToRefresh_Sample] SHA-1: 612846c9857077a039b533718f72db3bc041d389
[2015-04-30 14:21:06 - PullToRefresh_Sample] Path: F:\Android\PullToRefresh_Sample\libs\android-support-v4.jar
[2015-04-30 14:21:06 - PullToRefresh_Sample] Length: 349252
[2015-04-30 14:21:06 - PullToRefresh_Sample] SHA-1: 612846c9857077a039b533718f72db3bc041d389
[2015-04-30 14:21:06 - PullToRefresh_Sample] Path: F:\Android\pullToRefresh_libs\extras\PullToRefreshListFragment\libs\android-support-v4.jar
[2015-04-30 14:21:06 - PullToRefresh_Sample] Length: 758727
[2015-04-30 14:21:06 - PullToRefresh_Sample] SHA-1: efec67655f6db90757faa37201efcee2a9ec3507
[2015-04-30 14:21:06 - PullToRefresh_Sample] Jar mismatch! Fix your dependencies

出现该问题的原因是：

依赖关系列表中发现多个不同的android-support-v4.jar 4版本。

解决：

将所有依赖库的libs目录下android-support-v4.jar更换为主项目目录下的android-support-v4.jar即可。

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