我的android套接字客户端有问题。我尝试将字符串从android客户端发送到python服务器。我在netbeans中创建了一个测试应用程序，并且该代码可以正常工作，但是在android上不起作用。我验证数据是否通过服务器上的字符串打印到达服务器。
这是我的代码：
package com.example.tcp_button;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;
public class MainActivity extends Activity {
Button button;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
addListenerOnButton();
}
public void addListenerOnButton() {
button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
DataOutputStream dataOutputStream = null;
Socket socket = null;
try {
socket = new Socket("192.168.0.106", 5555);
dataOutputStream = new DataOutputStream(socket.getOutputStream());
dataOutputStream.writeUTF("on");
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
}
这是日志：
03-27 20:38:49.388: E/AndroidRuntime(2367): FATAL EXCEPTION: main
03-27 20:38:49.388: E/AndroidRuntime(2367): android.os.NetworkOnMainThreadException
03-27 20:38:49.388: E/AndroidRuntime(2367): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1128)
03-27 20:38:49.388: E/AndroidRuntime(2367): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
03-27 20:38:49.388: E/AndroidRuntime(2367): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
03-27 20:38:49.388: E/AndroidRuntime(2367): at libcore.io.IoBridge.connect(IoBridge.java:112)
03-27 20:38:49.388: E/AndroidRuntime(2367): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
03-27 20:38:49.388: E/AndroidRuntime(2367): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
03-27 20:38:49.388: E/AndroidRuntime(2367): at java.net.Socket.startupSocket(Socket.java:566)
03-27 20:38:49.388: E/AndroidRuntime(2367): at java.net.Socket.tryAllAddresses(Socket.java:127)
03-27 20:38:49.388: E/AndroidRuntime(2367): at java.net.Socket.<init>(Socket.java:177)
03-27 20:38:49.388: E/AndroidRuntime(2367): at java.net.Socket.<init>(Socket.java:149)
03-27 20:38:49.388: E/AndroidRuntime(2367): at com.example.tcp_button.MainActivity$1.onClick(MainActivity.java:46)
03-27 20:38:49.388: E/AndroidRuntime(2367): at android.view.View.performClick(View.java:4439)
03-27 20:38:49.388: E/AndroidRuntime(2367): at android.widget.Button.performClick(Button.java:142)
03-27 20:38:49.388: E/AndroidRuntime(2367): at android.view.View$PerformClick.run(View.java:18395)
03-27 20:38:49.388: E/AndroidRuntime(2367): at android.os.Handler.handleCallback(Handler.java:725)
03-27 20:38:49.388: E/AndroidRuntime(2367): at android.os.Handler.dispatchMessage(Handler.java:92)
03-27 20:38:49.388: E/AndroidRuntime(2367): at android.os.Looper.loop(Looper.java:176)
03-27 20:38:49.388: E/AndroidRuntime(2367): at android.app.ActivityThread.main(ActivityThread.java:5299)
03-27 20:38:49.388: E/AndroidRuntime(2367): at java.lang.reflect.Method.invokeNative(Native Method)
03-27 20:38:49.388: E/AndroidRuntime(2367): at java.lang.reflect.Method.invoke(Method.java:511)
03-27 20:38:49.388: E/AndroidRuntime(2367): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
03-27 20:38:49.388: E/AndroidRuntime(2367): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
03-27 20:38:49.388: E/AndroidRuntime(2367): at dalvik.system.NativeStart.main(Native Method)
最佳答案
您应该尝试通过以下方式制作Socket：
Socket socket = new Socket();
socket.connect(new InetSocketAddress(host, port), timeout);
// Use this just in case you have to read from the server
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF-8"));
// This will be used to send to the server
OutputStream out = socket.getOutputStream();
out.write("This is my message".getBytes("UTF-8"));
----编辑----
看到您的更新后，您的代码与它无关。您的问题是您将这段代码放在哪里，因为Android禁止在主UI中进行任何网络操作，因为这会阻止与用户的界面，从而导致非常糟糕的用户体验，并且用户可能会卸载您的应用程序。
您必须将该代码放在
Thread或AsyncTask中。如果您从它开始，则可能要尝试使用后者。这是nice example。关于java - TCP套接字Android客户端，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/22695924/