Problem mit Sockets

1public class MainActivity extends Activity {
2
3 private Socket client;
4 private Connection con;
5
6 @Override
7 protected void onCreate(Bundle savedInstanceState) {
8 super.onCreate(savedInstanceState);
9 setContentView(R.layout.activity_main);
10 new MainActivity();
11 }
12
13 public MainActivity() {
14 con = new Connection();
15 con.start();
16 }
17
18 @Override
19 public boolean onCreateOptionsMenu(Menu menu) {
20 getMenuInflater().inflate(R.menu.activity_main, menu);
21 return true;
22 }
23
24 public void sendMsg(View view) {
25 EditText input = (EditText) findViewById(R.id.input);
26 con.send(input.getText().toString()); // <--- Hier stürzt das Programm ab
27 }
28
29 public class Connection extends Thread {
30
31 public Connection() {
32
33 }
34
35 public void run() {
36 try {
37 client = new Socket("localhost", 9999);
38 EditText chat = (EditText) findViewById(R.id.chat);
39 chat.append("Verbindung zum Server erfolgreich.\n");
40 while (true) {
41 String s = receive();
42 chat.append("Server: " + s + "\n");
43 }
44
45 }
46 catch (IOException e) {
47 Log.d("Fehler", "Fehler in der Run Methode.");
48 }
49 }
50
51 public void send(String s) {
52 try {
53 BufferedWriter out = new BufferedWriter(new OutputStreamWriter(client.getOutputStream()));
54 out.write(s);
55 out.newLine();
56 out.flush();
57 }
58 catch (IOException e) {
59 Log.d("Fehler", "Fehler beim Senden.");
60 }
61 }
62
63 public String receive() {
64 String s = null;
65 try {
66 BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
67 s = in.readLine();
68 }
69 catch (IOException e) {
70 Log.d("Fehler", "Fehler beim Empfangen.");
71 }
72 return s;
73 }
74
75 }
76
77}

101-16 18:41:42.798: D/Fehler(31555): Fehler in der Run Methode.
201-16 18:41:42.863: D/Fehler(31555): Fehler in der Run Methode.
301-16 18:41:42.938: D/CLIPBOARD(31555): Hide Clipboard dialog at Starting input: finished by someone else... !
401-16 18:41:47.593: D/AndroidRuntime(31555): Shutting down VM
501-16 18:41:47.593: W/dalvikvm(31555): threadid=1: thread exiting with uncaught exception (group=0x40c681f8)
601-16 18:41:47.598: E/AndroidRuntime(31555): FATAL EXCEPTION: main
701-16 18:41:47.598: E/AndroidRuntime(31555): java.lang.IllegalStateException: Could not execute method of the activity
801-16 18:41:47.598: E/AndroidRuntime(31555): at android.view.View$1.onClick(View.java:3100)
901-16 18:41:47.598: E/AndroidRuntime(31555): at android.view.View.performClick(View.java:3627)
1001-16 18:41:47.598: E/AndroidRuntime(31555): at android.view.View$PerformClick.run(View.java:14329)
1101-16 18:41:47.598: E/AndroidRuntime(31555): at android.os.Handler.handleCallback(Handler.java:605)
1201-16 18:41:47.598: E/AndroidRuntime(31555): at android.os.Handler.dispatchMessage(Handler.java:92)
1301-16 18:41:47.598: E/AndroidRuntime(31555): at android.os.Looper.loop(Looper.java:137)
1401-16 18:41:47.598: E/AndroidRuntime(31555): at android.app.ActivityThread.main(ActivityThread.java:4511)
1501-16 18:41:47.598: E/AndroidRuntime(31555): at java.lang.reflect.Method.invokeNative(Native Method)
1601-16 18:41:47.598: E/AndroidRuntime(31555): at java.lang.reflect.Method.invoke(Method.java:511)
1701-16 18:41:47.598: E/AndroidRuntime(31555): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980)
1801-16 18:41:47.598: E/AndroidRuntime(31555): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747)
1901-16 18:41:47.598: E/AndroidRuntime(31555): at dalvik.system.NativeStart.main(Native Method)
2001-16 18:41:47.598: E/AndroidRuntime(31555): Caused by: java.lang.reflect.InvocationTargetException
2101-16 18:41:47.598: E/AndroidRuntime(31555): at java.lang.reflect.Method.invokeNative(Native Method)
2201-16 18:41:47.598: E/AndroidRuntime(31555): at java.lang.reflect.Method.invoke(Method.java:511)
2301-16 18:41:47.598: E/AndroidRuntime(31555): at android.view.View$1.onClick(View.java:3095)
2401-16 18:41:47.598: E/AndroidRuntime(31555): ... 11 more
2501-16 18:41:47.598: E/AndroidRuntime(31555): Caused by: java.lang.NullPointerException
2601-16 18:41:47.598: E/AndroidRuntime(31555): at com.example.chatapp.MainActivity$Connection.send(MainActivity.java:68)
2701-16 18:41:47.598: E/AndroidRuntime(31555): at com.example.chatapp.MainActivity.sendMsg(MainActivity.java:41)
2801-16 18:41:47.598: E/AndroidRuntime(31555): ... 14 more