java.lang.UnsatisfiedLinkError: Couldn't load hyphenate_av from loader dalvik.system.PathClassLoader

android studio引入第三方库时报如下异常。

06-15 16:50:24.477 9497-9497/easemobim.test.com.easemobim E/AndroidRuntime: FATAL EXCEPTION: main
        java.lang.UnsatisfiedLinkError: Couldn't load hyphenate_av from loader dalvik.system.PathClassLoader[dexPath=/data/app/easemobim.test.com.easemobim-1.apk,libraryPath=/data/app-lib/easemobim.test.com.easemobim-1]: findLibrary returned null
            at java.lang.Runtime.loadLibrary(Runtime.java:365)
            at java.lang.System.loadLibrary(System.java:535)
            at com.hyphenate.chat.EMClient.loadLibrary(Unknown Source)
            at com.hyphenate.chat.EMClient.getInstance(Unknown Source)
            at easemobim.test.com.easemobim.MainActivity.onCreate(MainActivity.java:57)
            at android.app.Activity.performCreate(Activity.java:5104)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1092)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2254)
            at android.app.ActivityThread.access$600(ActivityThread.java:141)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5069)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
            at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132)
            at dalvik.system.NativeStart.main(Native Method)

　　原因是android studio导入so文件没有编译到apk里面去，所以导致UnsatisfiedLinkError异常
　　打开app下的build.gradle，在android的标签下加入如下代码：

  sourceSets {
        main {
            //jni库的调用会到资源文件夹下libs里面找so文件
            jniLibs.srcDirs = ['libs']
         }
        }

　　如：

android {
    ... ...

    sourceSets{
        main{
            jniLibs.srcDirs = ['libs']
        }
    }

    ... ...
}