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我在我的電腦和android之間創建客戶端套接字連接。Android中的Java客戶端套接字連接
這裏是服務器的代碼：
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
class Server {
public static void main(String[] args) {
String ip = getIpAddress();
if (ip != "false") {
try {
ServerSocket srvr = new ServerSocket(4444);
Socket client = null;
try {
client = srvr.accept();
PrintWriter out = new PrintWriter(client.getOutputStream(), true);
System.out.print("Sending ip address: '" + ip + "'\n");
out.print(ip);
out.close();
client.close();
srvr.close();
} catch(Exception e) {
System.out.print(String.format("Accept failed: %s",e));
}
} catch (Exception e) {
System.out.print(String.format("Could not listem on port: %s",e));
}
}
else
{
System.out.print("Could not get ip address");
}
}
public static String getIpAddress() {
InetAddress host;
String ipString = "false";
try {
host = InetAddress.getLocalHost();
ipString = host.getHostAddress();
} catch (UnknownHostException e) {
System.out.println(e);
}
return ipString;
}
}
當我在電腦上的一切運行客戶端工作。 下面是計算機客戶端的代碼：
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
public class Client {
public static void main(String[] args) {
System.out.print(RunSocketClient());
}
public static String RunSocketClient() {
try {
Socket clnt = new Socket("localhost",4444);
BufferedReader in = new BufferedReader(new InputStreamReader(clnt.getInputStream()));
String fromServer;
fromServer = in.readLine();
return fromServer;
} catch (IOException e) {
return "nothing";
}
}
}
當我運行在安卓系統中此客戶端代碼停止工作，什麼是錯誤？ 下面是Android客戶端代碼：
package com.example.clientapp;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LinearLayout lView = new LinearLayout(this);
TextView myText = new TextView(this);
String ip = RunSocketClient();
Log.d("ClientApp",ip);
myText.setText(ip);
lView.addView(myText);
setContentView(lView);
}
public static String RunSocketClient() {
try {
Socket clnt = new Socket("localhost",4444);
BufferedReader in = new BufferedReader(new InputStreamReader(clnt.getInputStream()));
String fromServer;
fromServer = in.readLine();
return fromServer;
} catch (IOException e) {
return "nothing";
}
}
}
這裏是應用程序崩潰的logcat的：
04-13 00:10:31.411: D/AndroidRuntime(13978): Shutting down VM
04-13 00:10:31.411: W/dalvikvm(13978): threadid=1: thread exiting with uncaught exception (group=0x410ab300)
04-13 00:10:31.411: E/AndroidRuntime(13978): FATAL EXCEPTION: main
04-13 00:10:31.411: E/AndroidRuntime(13978): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.clientapp/com.example.clientapp.MainActivity}: android.os.NetworkOnMainThreadException
04-13 00:10:31.411: E/AndroidRuntime(13978): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
04-13 00:10:31.411: E/AndroidRuntime(13978): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
04-13 00:10:31.411: E/AndroidRuntime(13978): at android.app.ActivityThread.access$600(ActivityThread.java:130)
04-13 00:10:31.411: E/AndroidRuntime(13978): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
04-13 00:10:31.411: E/AndroidRuntime(13978): at android.os.Handler.dispatchMessage(Handler.java:99)
04-13 00:10:31.411: E/AndroidRuntime(13978): at android.os.Looper.loop(Looper.java:137)
04-13 00:10:31.411: E/AndroidRuntime(13978): at android.app.ActivityThread.main(ActivityThread.java:4745)
04-13 00:10:31.411: E/AndroidRuntime(13978): at java.lang.reflect.Method.invokeNative(Native Method)
04-13 00:10:31.411: E/AndroidRuntime(13978): at java.lang.reflect.Method.invoke(Method.java:511)
04-13 00:10:31.411: E/AndroidRuntime(13978): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
04-13 00:10:31.411: E/AndroidRuntime(13978): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
04-13 00:10:31.411: E/AndroidRuntime(13978): at dalvik.system.NativeStart.main(Native Method)
04-13 00:10:31.411: E/AndroidRuntime(13978): Caused by: android.os.NetworkOnMainThreadException
04-13 00:10:31.411: E/AndroidRuntime(13978): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
04-13 00:10:31.411: E/AndroidRuntime(13978): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
04-13 00:10:31.411: E/AndroidRuntime(13978): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
04-13 00:10:31.411: E/AndroidRuntime(13978): at java.net.InetAddress.getAllByName(InetAddress.java:214)
04-13 00:10:31.411: E/AndroidRuntime(13978): at java.net.Socket.tryAllAddresses(Socket.java:108)
04-13 00:10:31.411: E/AndroidRuntime(13978): at java.net.Socket.<init>(Socket.java:177)
04-13 00:10:31.411: E/AndroidRuntime(13978): at java.net.Socket.<init>(Socket.java:149)
04-13 00:10:31.411: E/AndroidRuntime(13978): at com.example.clientapp.MainActivity.RunSocketClient(MainActivity.java:34)
04-13 00:10:31.411: E/AndroidRuntime(13978): at com.example.clientapp.MainActivity.onCreate(MainActivity.java:23)
04-13 00:10:31.411: E/AndroidRuntime(13978): at android.app.Activity.performCreate(Activity.java:5008)
04-13 00:10:31.411: E/AndroidRuntime(13978): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
04-13 00:10:31.411: E/AndroidRuntime(13978): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
04-13 00:10:31.411: E/AndroidRuntime(13978): ... 11 more
系統停止工作是什麼意思？應用程序崩潰了嗎？如果是的話請把logcat。 – stinepike
是的應用程序崩潰。我把logcat放在問題中。 – aagarwal