java - 无法创建Android客户端套接字

Question

我正在尝试创建一个连接到桌面上的服务器的 Android 客户端应用程序。
我成功从笔记本电脑远程登录到服务器。
我已将 INTERNET 和 NETWORK 权限放入 list 文件中。
创建套接字时程序崩溃，并且 Eclipse 调试器让我进入 socket.class 源文件。

更新: 这是我的完整代码

public class EsmFamilActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_esm_famil);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.esm_famil, menu);
    return true;
}

//handler for sendtoserver
public void sendToServer(View view){

    ...


    String host = "192.168.1.7";
    int port = 8888;
    try{
        Socket s = new Socket(host, port);
        Writer out = new OutputStreamWriter(s.getOutputStream());
        out.write(data + "\n");
        out.flush();
        s.close();
    }catch (UnknownHostException ex) {
        ex.printStackTrace();
    }catch(IOException ex){
        ex.printStackTrace();
    }

}

}

这是我的 logcat

01-18 21:43:06.908: D/TextView(1608): Constructor -- Got mEditTextBackgroundColor
01-18 21:43:09.658: W/IInputConnectionWrapper(1608): beginBatchEdit on inactive InputConnection
01-18 21:43:09.668: W/IInputConnectionWrapper(1608): endBatchEdit on inactive InputConnection
01-18 21:43:11.448: W/IInputConnectionWrapper(1608): beginBatchEdit on inactive InputConnection
01-18 21:43:11.448: W/IInputConnectionWrapper(1608): endBatchEdit on inactive InputConnection
01-18 21:43:46.018: D/AndroidRuntime(1608): Shutting down VM
01-18 21:43:46.018: W/dalvikvm(1608): threadid=1: thread exiting with uncaught exception (group=0x42f02500)
01-18 21:43:46.038: E/AndroidRuntime(1608): FATAL EXCEPTION: main
01-18 21:43:46.038: E/AndroidRuntime(1608): java.lang.IllegalStateException: Could not execute method of the activity
01-18 21:43:46.038: E/AndroidRuntime(1608):     at android.view.View$1.onClick(View.java:3678)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at android.view.View.performClick(View.java:4300)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at android.view.View$PerformClick.run(View.java:18026)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at android.os.Handler.handleCallback(Handler.java:730)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at android.os.Handler.dispatchMessage(Handler.java:92)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at android.os.Looper.loop(Looper.java:150)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at android.app.ActivityThread.main(ActivityThread.java:5162)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at java.lang.reflect.Method.invokeNative(Native Method)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at java.lang.reflect.Method.invoke(Method.java:525)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at dalvik.system.NativeStart.main(Native Method)
01-18 21:43:46.038: E/AndroidRuntime(1608): Caused by: java.lang.reflect.InvocationTargetException
01-18 21:43:46.038: E/AndroidRuntime(1608):     at java.lang.reflect.Method.invokeNative(Native Method)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at java.lang.reflect.Method.invoke(Method.java:525)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at android.view.View$1.onClick(View.java:3673)
01-18 21:43:46.038: E/AndroidRuntime(1608):     ... 11 more
01-18 21:43:46.038: E/AndroidRuntime(1608): Caused by: android.os.NetworkOnMainThreadException
01-18 21:43:46.038: E/AndroidRuntime(1608):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at libcore.io.IoBridge.connect(IoBridge.java:112)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at java.net.Socket.startupSocket(Socket.java:566)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at java.net.Socket.tryAllAddresses(Socket.java:127)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at java.net.Socket.<init>(Socket.java:177)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at java.net.Socket.<init>(Socket.java:149)
01-18 21:43:46.038: E/AndroidRuntime(1608):     at com.example.myfirstapp.EsmFamilActivity.sendToServer(EsmFamilActivity.java:61)
01-18 21:43:46.038: E/AndroidRuntime(1608):     ... 14 more
01-18 21:43:53.518: I/Process(1608): Sending signal. PID: 1608 SIG: 9
01-18 21:43:53.668: D/TextView(2467): Constructor - Got Res id for appearance for textColorPrimaryInverse
01-18 21:43:53.668: W/ResourceType(2467): Skipping entry 0x1060085 in package table 0 because it is not complex!
01-18 21:43:53.668: D/TextView(2467): Constructor - Got appearance for textColorPrimaryInverse
01-18 21:43:53.668: D/TextView(2467): Constructor -- Got mEditTextBackgroundColor
01-18 21:43:53.998: D/libEGL(2467): loaded /vendor/lib/egl/libEGL_POWERVR_SGX544_115.so
01-18 21:43:54.078: D/libEGL(2467): loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX544_115.so
01-18 21:43:54.088: D/libEGL(2467): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX544_115.so
01-18 21:43:54.088: E/IMGSRV(2467): :0: PVRDRMOpen: TP3, ret = 42
01-18 21:43:54.098: E/IMGSRV(2467): :0: PVRDRMOpen: TP3, ret = 45
01-18 21:43:54.098: E/IMGSRV(2467): :0: PVRDRMOpen: TP3, ret = 46
01-18 21:43:54.098: E/IMGSRV(2467): :0: PVRDRMOpen: TP3, ret = 46
01-18 21:43:54.098: E/IMGSRV(2467): :0: PVRDRMOpen: TP3, ret = 46
01-18 21:43:54.108: E/IMGSRV(2467): :0: PVRDRMOpen: TP3, ret = 48
01-18 21:43:54.138: D/OpenGLRenderer(2467): Enabling debug mode 0

Answer 1

我了解到 Android 应用程序正在服务器桌面上的模拟器中运行。所以首先你需要更改 LAN IP 192.168.x.x

Blockquote When working with the Android emulator, you may frequently need to access data hosted on the local web server using localhost. For example, your own web services are likely to be hosted on your local computer during development, and you’ll want to test them on the same development machine you use to write your Android applications. In such cases, you should use the special IP address of 10.0.2.2 (not 127.0.0.1) to refer to the host computer’s loopback interface. From the Android emulator’s perspective, localhost (127.0.0.1) refers to its own loopback interface.

引用自 http://p2p.wrox.com/book-beginning-android-application-development-631/

然后，如果 Android 应用程序没有在服务器中运行，我想您需要一些额外的行来避免错误:

serverAddress =
InetAddress.getByName(“192.168.1.142”);
//--remember to change the IP address above to match your own-- and also the port
socket = new Socket(serverAddress, 500);

而且我还假设您正在扩展 AsyncTask 类中执行操作。