Android Retrofit W/System.err: java.net.SocketTimeoutException: failed to connect to /192.168.0.102

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Android Retrofit 访问本地Restful API报错，

错误信息：

W/System.err: java.net.SocketTimeoutException: failed to connect to /10.0.2.2 (port 9000) after 10000ms
W/System.err:     at libcore.io.IoBridge.connectErrno(IoBridge.java:189)
        at libcore.io.IoBridge.connect(IoBridge.java:127)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:188)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:461)
        at java.net.Socket.connect(Socket.java:918)
        at okhttp3.internal.Platform$Android.connectSocket(Platform.java:211)
        at okhttp3.internal.io.RealConnection.connectSocket(RealConnection.java:140)
        at okhttp3.internal.io.RealConnection.connect(RealConnection.java:111)
        at okhttp3.internal.http.StreamAllocation.findConnection(StreamAllocation.java:188)
        at okhttp3.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:127)
        at okhttp3.internal.http.StreamAllocation.newStream(StreamAllocation.java:97)
        at okhttp3.internal.http.HttpEngine.connect(HttpEngine.java:289)
W/System.err:     at okhttp3.internal.http.HttpEngine.sendRequest(HttpEngine.java:241)
        at okhttp3.RealCall.getResponse(RealCall.java:240)
        at okhttp3.RealCall$ApplicationInterceptorChain.proceed(RealCall.java:198)
        at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:160)
        at okhttp3.RealCall.access$100(RealCall.java:30)
        at okhttp3.RealCall$AsyncCall.execute(RealCall.java:127)
        at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
        at java.lang.Thread.run(Thread.java:818)

错误原因：真机访问不到10.0.2.2。

解决办法：可以用模拟器测试或者将服务发布到公网上测试。