reference to : http://blog.csdn.net/hbwindy/article/details/51326019
reference to : http://blog.csdn.net/yangqingqo/article/details/48214865
今天在写网络连接的时候发现API 23中居然找不到HttpClient，官方文档似乎是这样说的。
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This
interface
was deprecated in API level
22
.
Please use openConnection() instead. Please visit
this
webpage
for
further details.
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那么只有再找办法，还真找到了：
To continue using the Apache HTTP APIs, you must first declare the following compile-time dependency in your build.gradle file:
do not need to copy sdk/platforms/android-23/optional/org.apache.http.legacy.jar into libs folder, system auto recoginise itself.
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android {
useLibrary
'org.apache.http.legacy'
}
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proguard cofig :
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#不混淆org.apache.http.legacy.jar
-dontwarn android.net.compatibility.**
-dontwarn android.net.http.**
-dontwarn com.android.internal.http.multipart.**
-dontwarn org.apache.commons.**
-dontwarn org.apache.http.**
-keep
class
android.net.compatibility.**{*;}
-keep
class
android.net.http.**{*;}
-keep
class
com.android.internal.http.multipart.**{*;}
-keep
class
org.apache.commons.**{*;}
-keep
class
org.apache.http.**{*;}
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