我尝试为服务器连接构建客户端。 但是，如果我尝试在Android Studio中构建此客户端，那我将成为致命的例外： android.os.NetworkOnMainThreadException。 我搜索了不同的解决方案，但没有任何效果。我希望你能帮助我。
INTERNET-PERMISSION已在清单中显示
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.oliverlenk.pmt, PID: 2387
android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1303)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:333)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:196)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:356)
at java.net.Socket.connect(Socket.java:605)
at java.net.Socket.connect(Socket.java:554)
at java.net.Socket.<init>(Socket.java:431)
at java.net.Socket.<init>(Socket.java:210)
at com.example.oliverlenk.pmt.MainActivity$1.onClick(MainActivity.java:84)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
应用程序终止。
这是我的Java代码：
公共类MainActivity扩展了活动{
// Inistailierung
Button Send;
EditText IP;
EditText Port;
TextView Answer;
EditText Message;
private String ip_address;
private int port = 11880;
private SSLSocket socket = null;
private BufferedReader in = null;
private BufferedWriter out = null;
private final String TAG = "TAG";
private char keystorepass[] = "key12345".toCharArray();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Send = (Button) findViewById(R.id.btnSend);
IP = (EditText) findViewById(R.id.etIP);
Port = (EditText) findViewById(R.id.etPort);
Answer = (TextView) findViewById(R.id.tvAnswer);
Message = (EditText) findViewById(R.id.etMessage);
Send.setClickable(true);
Send.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (IP.getText().toString().equals(null) || Port.getText().toString().equals(null)){
Toast.makeText(v.getContext(), "Bitte IP und Port eingeben", Toast.LENGTH_LONG).show();
}else {
String temp = Message.getText().toString();
if (temp == null){
temp = "Es wurde keine Nachricht eingegeben";
}
port = Integer.parseInt(Port.getText().toString());
ip_address = IP.getText().toString();
try {
KeyStore ks = KeyStore.getInstance("BKS");
InputStream keyin = v.getResources().openRawResource(R.raw.neuserverkeypem);
ks.load(keyin,keystorepass);
org.apache.http.conn.ssl.SSLSocketFactory socketFactory = new org.apache.http.conn.ssl.SSLSocketFactory(ks);
socketFactory.setHostnameVerifier(socketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
socket = (SSLSocket)
socketFactory.createSocket(new Socket(ip_address,port), ip_address, port, false);
socket.startHandshake();
printServerCertificate(socket);
printSocketInfo(socket);
out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
chat(temp);
} catch (UnknownHostException e) {
Toast.makeText(v.getContext(), "Unknown host", Toast.LENGTH_SHORT).show();
Log.i(TAG,"Unknown host");
//System.exit(1);
} catch (IOException e) {
Toast.makeText(v.getContext(), "No I/O", Toast.LENGTH_SHORT).show();
Log.i(TAG,"No I/O");
e.printStackTrace();
//System.exit(1);
} catch (KeyStoreException e) {
Toast.makeText(v.getContext(), "Keystore ks error", Toast.LENGTH_SHORT).show();
Log.i(TAG,"Keystore ks error");
//System.exit(-1);
} catch (NoSuchAlgorithmException e) {
Toast.makeText(v.getContext(), "No such algorithm for ks.load", Toast.LENGTH_SHORT).show();
Log.i(TAG,"No such algorithm for ks.load");
e.printStackTrace();
//System.exit(-1);
} catch (CertificateException e) {
Toast.makeText(v.getContext(), "certificate missing", Toast.LENGTH_SHORT).show();
Log.i(TAG,"certificate missing");
e.printStackTrace();
//System.exit(-1);
} catch (UnrecoverableKeyException e) {
Toast.makeText(v.getContext(), "UnrecoverableKeyException", Toast.LENGTH_SHORT).show();
Log.i(TAG,"unrecoverableKeyException");
e.printStackTrace();
//System.exit(-1);
} catch (KeyManagementException e) {
Toast.makeText(v.getContext(), "KeyManagementException", Toast.LENGTH_SHORT).show();
Log.i(TAG,"key management exception");
e.printStackTrace();
//System.exit(-1);
}
}
}
});
}
private void printServerCertificate(SSLSocket socket) {
try {
Certificate[] serverCerts =
socket.getSession().getPeerCertificates();
for (int i = 0; i < serverCerts.length; i++) {
Certificate myCert = serverCerts[i];
Log.i(TAG,"====Certificate:" + (i+1) + "====");
Log.i(TAG,"-Public Key-\n" + myCert.getPublicKey());
Log.i(TAG,"-Certificate Type-\n " + myCert.getType());
System.out.println();
}
} catch (SSLPeerUnverifiedException e) {
Log.i(TAG,"Could not verify peer");
e.printStackTrace();
System.exit(-1);
}
}
private void printSocketInfo(SSLSocket s) {
Log.i(TAG,"Socket class: "+s.getClass());
Log.i(TAG," Remote address = "
+s.getInetAddress().toString());
Log.i(TAG," Remote port = "+s.getPort());
Log.i(TAG," Local socket address = "
+s.getLocalSocketAddress().toString());
Log.i(TAG," Local address = "
+s.getLocalAddress().toString());
Log.i(TAG," Local port = "+s.getLocalPort());
Log.i(TAG," Need client authentication = "
+s.getNeedClientAuth());
SSLSession ss = s.getSession();
Log.i(TAG," Cipher suite = "+ss.getCipherSuite());
Log.i(TAG," Protocol = "+ss.getProtocol());
}
public void chat(String temp){
String message = temp;
String line = "";
// send id of the device to match with the image
try {
out.write(message+"\n");
out.flush();
} catch (IOException e2) {
Log.i(TAG,"Read failed");
System.exit(1);
}
// receive a ready command from the server
try {
line = in.readLine();
Answer.setText("SERVER SAID: "+line);
//Log.i(TAG,line);
} catch (IOException e1) {
Log.i(TAG,"Read failed");
System.exit(1);
}
}
}