我正尝试通过普通的wifi连接使用Socket连接在2个Android设备（Moto G和Nexus 5）之间建立连接。
我有一个以服务器/客户端模式运行的应用程序。该应用程序在两台设备上运行。
当我将我的MotoG设置为服务器时，我能够完美地从我的客户端应用程序（Nexus）发送数据。但是，这不适用于相反的情况。我最终得到以下错误 -
java.net.ConnectException：无法连接到SERVERIP（端口8080）：连接失败：ENETUNREACH（网络无法访问）
服务器代码 -
public class ServerThread implements Runnable {
public void run() {
try {
if (SERVERIP != null) {
handler.post(new Runnable() {
@Override
public void run() {
serverStatus
.setText("Listening on IP: " + SERVERIP);
}
});
serverSocket = new ServerSocket(8080);
while (true) {
// LISTEN FOR INCOMING CLIENTS
Socket client = serverSocket.accept();
handler.post(new Runnable() {
@Override
public void run() {
serverStatus2.setText("Connected.");
}
});
try {
BufferedReader in = new BufferedReader(
new InputStreamReader(
client.getInputStream()));
String line = null;
while ((line = in.readLine()) != null) {
final String currLine = line;
Log.i("Server Activity",currLine);
handler.post(new Runnable() {
@Override
public void run() {
String origString = serverStatus2.getText().toString();
String newString = origString + "\n" + currLine;
serverStatus2.setText(newString);
ToneGenerator tone = new ToneGenerator(AudioManager.STREAM_NOTIFICATION,90);
tone.startTone(ToneGenerator.TONE_PROP_ACK,10);
}
});
}
break;
} catch (Exception e) {
handler.post(new Runnable() {
@Override
public void run() {
serverStatus
.setText("Oops. Connection interrupted. Please reconnect your phones.");
}
});
e.printStackTrace();
}
}
} else {
handler.post(new Runnable() {
@Override
public void run() {
serverStatus
.setText("Couldn't detect internet connection.");
}
});
}
} catch (final Exception e) {
handler.post(new Runnable() {
@Override
public void run() {
serverStatus.setText("Error" + e.getMessage());
}
});
e.printStackTrace();
}
}
}
// GETS THE IP ADDRESS OF YOUR PHONE'S NETWORK
private String getLocalIpAddress() {
try {
for (Enumeration<NetworkInterface> en = NetworkInterface
.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> enumIpAddr = intf
.getInetAddresses(); enumIpAddr.hasMoreElements();) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress()) {
return inetAddress.getHostAddress().toString();
}
}
}
} catch (SocketException ex) {
Log.e("ServerActivity", ex.toString());
}
return null;
}
@Override
protected void onStop() {
super.onStop();
try {
// MAKE SURE YOU CLOSE THE SOCKET UPON EXITING
serverSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
客户 -
public class ClientThread implements Runnable {
public void run() {
try {
if (socket==null){
initSocketConn();
}
//connected = true;
//while (connected) {
try {
Log.d("ClientActivity", "C: Sending command.");
if (out==null){
out = new PrintWriter(
new BufferedWriter(new OutputStreamWriter(
socket.getOutputStream())), true);
}
// WHERE YOU ISSUE THE COMMANDS
out.println(edtMessage.getText().toString());
Log.d("ClientActivity", "C: Sent.");
} catch (Exception e) {
Log.e("ClientActivity", "S: Error", e);
}
//}
//socket.close();
Log.d("ClientActivity", "C: Closed.");
} catch (Exception e) {
Log.e("ClientActivity", "C: Error", e);
connected = false;
}
}
}
private void initSocketConn(){
try{
InetAddress serverAddr = InetAddress.getByName(serverIpAddress);
Log.d("ClientActivity", "C: Connecting...");
socket = new Socket(serverAddr,
8080); //THIS IS WHERE THE ERROR IS THROWN
}
catch (Exception ex){
ex.printStackTrace();
}
}
我在网上查了一下＆amp;尝试了不同的选项，比如使用不同的端口号，但它没有用。我很困惑为什么当Moto是服务器时代码完美运行但是当NExus是服务器时给出错误???请帮忙！
Logcat -
03-29 07:25:06.065 20592-20611/com.shriwas.samplesocketapp D/OpenGLRenderer: endAllActiveAnimators on 0xb7ca02d8 (RippleDrawable) with handle 0xb7d24240
03-29 07:25:08.957 20592-21470/com.shriwas.samplesocketapp D/ClientActivity: C: Connecting...
03-29 07:25:08.958 20592-21470/com.shriwas.samplesocketapp W/System.err: java.net.ConnectException: failed to connect to /fe80::8c3a:e3ff:fe5d:2e0d%p2p0%25 (port 8080): connect failed: ENETUNREACH (Network is unreachable)
03-29 07:25:08.963 20592-21470/com.shriwas.samplesocketapp W/System.err: at libcore.io.IoBridge.connect(IoBridge.java:124)
03-29 07:25:08.963 20592-21470/com.shriwas.samplesocketapp W/System.err: at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
03-29 07:25:08.963 20592-21470/com.shriwas.samplesocketapp W/System.err: at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:163)
03-29 07:25:08.963 20592-21470/com.shriwas.samplesocketapp W/System.err: at java.net.Socket.startupSocket(Socket.java:590)
03-29 07:25:08.963 20592-21470/com.shriwas.samplesocketapp W/System.err: at java.net.Socket.<init>(Socket.java:226)
03-29 07:25:08.964 20592-21470/com.shriwas.samplesocketapp W/System.err: at com.shriwas.samplesocketapp.MyClientActivity.initSocketConn(MyClientActivity.java:108)
03-29 07:25:08.964 20592-21470/com.shriwas.samplesocketapp W/System.err: at com.shriwas.samplesocketapp.MyClientActivity.access$300(MyClientActivity.java:20)
03-29 07:25:08.964 20592-21470/com.shriwas.samplesocketapp W/System.err: at com.shriwas.samplesocketapp.MyClientActivity$ClientThread.run(MyClientActivity.java:77)
03-29 07:25:08.964 20592-21470/com.shriwas.samplesocketapp W/System.err: at java.lang.Thread.run(Thread.java:818)
03-29 07:25:08.964 20592-21470/com.shriwas.samplesocketapp W/System.err: Caused by: android.system.ErrnoException: connect failed: ENETUNREACH (Network is unreachable)
03-29 07:25:08.964 20592-21470/com.shriwas.samplesocketapp W/System.err: at libcore.io.Posix.connect(Native Method)
03-29 07:25:08.964 20592-21470/com.shriwas.samplesocketapp W/System.err: at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:111)
03-29 07:25:08.964 20592-21470/com.shriwas.samplesocketapp W/System.err: at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
03-29 07:25:08.964 20592-21470/com.shriwas.samplesocketapp W/System.err: at libcore.io.IoBridge.connect(IoBridge.java:122)
03-29 07:25:08.965 20592-21470/com.shriwas.samplesocketapp W/System.err: ... 8 more
03-29 07:25:08.966 20592-21470/com.shriwas.samplesocketapp D/ClientActivity: C: Sending command.
03-29 07:25:08.971 20592-21470/com.shriwas.samplesocketapp E/ClientActivity: S:
错误
java.lang.NullPointerException：尝试调用虚方法 ＆＃39; java.io.OutputStream java.net.Socket.getOutputStream（）＆＃39;在null 对象参考
在 com.shriwas.samplesocketapp.MyClientActivity $ ClientThread.run（MyClientActivity.java:84） 在java.lang.Thread.run（Thread.java:818） 03-29 07：25：08.971 20592-21470 / com.shriwas.samplesocketapp D / ClientActivity：C：已关闭。