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POAndroid uncaught handler/uncaught exception
 

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  1. POAndroid uncaught handler/uncaught exception
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    <p>this is my first Android app and I'm trying to use Sockets to send text from my computer (server) to my phone (client). I've programmed in Java a lot before, but always with DrJava, not Eclipse, which is what I'm having to use for Android programming.</p> <p>The following code is simply an example Java program using Sockets that I just added and removed a few lines and pasted it into the Android code. The code is found here: <a href="http://zerioh.tripod.com/ressources/sockets.html" rel="nofollow">http://zerioh.tripod.com/ressources/sockets.html</a> If you don't trust links, you can Google "java socket example." It should be the first link.</p> <p>I'm getting an uncaught exception error, but I've looked through the code many times and I can't find a place without a catch line. The code works with Java, but not Android, so I think it's some issue with Android-specific syntax.</p> <p>Here is the Android code (client):</p> <pre><code>package com.example.helloandroid; import android.app.Activity; import android.widget.TextView; import android.os.Bundle; import java.io.*; import java.net.Socket; import java.net.UnknownHostException; public class HelloAndroid extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //TextView tv = new TextView(this); //tv.setText("Eclipse is a horrible program"); Requester client = new Requester(); client.run(); //setContentView(tv); } } class Requester{ Socket requestSocket; ObjectOutputStream out; ObjectInputStream in; String message; void run() { try{ //1. creating a socket to connect to the server requestSocket = new Socket("localhost", 2004); System.out.println("Connected to localhost in port 2004"); //2. get Input and Output streams out = new ObjectOutputStream(requestSocket.getOutputStream()); out.flush(); in = new ObjectInputStream(requestSocket.getInputStream()); //3: Communicating with the server try{ message = (String)in.readObject(); System.out.println("server&gt;" + message); sendMessage("asdfjksajdflksjdklfjsdklfjlsdf"); message = "bye"; sendMessage(message); } catch(ClassNotFoundException classNot){ System.err.println("data received in unknown format"); } } catch(UnknownHostException unknownHost) { System.err.println("You are trying to connect to an unknown host!"); } catch(IOException ioException) { ioException.printStackTrace(); } finally{ //4: Closing connection try{ in.close(); out.close(); requestSocket.close(); } catch(IOException ioException){ ioException.printStackTrace(); } } } void sendMessage(String msg) { try{ out.writeObject(msg); out.flush(); System.out.println("client&gt;" + msg); } catch(Exception e) { e.printStackTrace(); } /*catch(IOException ioException){ ioException.printStackTrace(); }*/ } } </code></pre> <p>The server code is the same as on the website.</p> <p>Here is the catlog lines that I think are relevant. If I missed some, let me know and I'll post those too:</p> <pre><code>11-20 22:37:35.314: W/System.err(545): java.net.SocketException: Permission denied (maybe missing INTERNET permission) 11-20 22:37:35.324: W/System.err(545): at org.apache.harmony.luni.platform.OSNetworkSystem.createStreamSocketImpl(Native Method) 11-20 22:37:35.324: W/System.err(545): at org.apache.harmony.luni.platform.OSNetworkSystem.createStreamSocket(OSNetworkSystem.java:187) 11-20 22:37:35.324: W/System.err(545): at org.apache.harmony.luni.net.PlainSocketImpl.create(PlainSocketImpl.java:266) 11-20 22:37:35.324: W/System.err(545): at java.net.Socket.startupSocket(Socket.java:773) 11-20 22:37:35.324: W/System.err(545): at java.net.Socket.tryAllAddresses(Socket.java:192) 11-20 22:37:35.324: W/System.err(545): at java.net.Socket.&lt;init&gt;(Socket.java:256) 11-20 22:37:35.334: W/System.err(545): at java.net.Socket.&lt;init&gt;(Socket.java:220) 11-20 22:37:35.334: W/System.err(545): at com.example.helloandroid.Requester.run(HelloAndroid.java:33) 11-20 22:37:35.334: W/System.err(545): at com.example.helloandroid.HelloAndroid.onCreate(HelloAndroid.java:19) 11-20 22:37:35.334: W/System.err(545): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 11-20 22:37:35.334: W/System.err(545): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 11-20 22:37:35.334: W/System.err(545): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 11-20 22:37:35.344: W/System.err(545): at android.app.ActivityThread.access$2200(ActivityThread.java:119) 11-20 22:37:35.344: W/System.err(545): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 11-20 22:37:35.344: W/System.err(545): at android.os.Handler.dispatchMessage(Handler.java:99) 11-20 22:37:35.344: W/System.err(545): at android.os.Looper.loop(Looper.java:123) 11-20 22:37:35.344: W/System.err(545): at android.app.ActivityThread.main(ActivityThread.java:4363) 11-20 22:37:35.344: W/System.err(545): at java.lang.reflect.Method.invokeNative(Native Method) 11-20 22:37:35.344: W/System.err(545): at java.lang.reflect.Method.invoke(Method.java:521) 11-20 22:37:35.344: W/System.err(545): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 11-20 22:37:35.344: W/System.err(545): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 11-20 22:37:35.354: W/System.err(545): at dalvik.system.NativeStart.main(Native Method) 11-20 22:37:35.354: D/AndroidRuntime(545): Shutting down VM 11-20 22:37:35.354: W/dalvikvm(545): threadid=3: thread exiting with uncaught exception (group=0x4001b188) 11-20 22:37:35.354: E/AndroidRuntime(545): Uncaught handler: thread main exiting due to uncaught exception 11-20 22:37:35.364: E/AndroidRuntime(545): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.helloandroid/com.example.helloandroid.HelloAndroid}: java.lang.NullPointerException 11-20 22:37:35.364: E/AndroidRuntime(545): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496) 11-20 22:37:35.364: E/AndroidRuntime(545): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 11-20 22:37:35.364: E/AndroidRuntime(545): at android.app.ActivityThread.access$2200(ActivityThread.java:119) 11-20 22:37:35.364: E/AndroidRuntime(545): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 11-20 22:37:35.364: E/AndroidRuntime(545): at android.os.Handler.dispatchMessage(Handler.java:99) 11-20 22:37:35.364: E/AndroidRuntime(545): at android.os.Looper.loop(Looper.java:123) 11-20 22:37:35.364: E/AndroidRuntime(545): at android.app.ActivityThread.main(ActivityThread.java:4363) 11-20 22:37:35.364: E/AndroidRuntime(545): at java.lang.reflect.Method.invokeNative(Native Method) 11-20 22:37:35.364: E/AndroidRuntime(545): at java.lang.reflect.Method.invoke(Method.java:521) 11-20 22:37:35.364: E/AndroidRuntime(545): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 11-20 22:37:35.364: E/AndroidRuntime(545): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 11-20 22:37:35.364: E/AndroidRuntime(545): at dalvik.system.NativeStart.main(Native Method) 11-20 22:37:35.364: E/AndroidRuntime(545): Caused by: java.lang.NullPointerException 11-20 22:37:35.364: E/AndroidRuntime(545): at com.example.helloandroid.Requester.run(HelloAndroid.java:60) 11-20 22:37:35.364: E/AndroidRuntime(545): at com.example.helloandroid.HelloAndroid.onCreate(HelloAndroid.java:19) 11-20 22:37:35.364: E/AndroidRuntime(545): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 11-20 22:37:35.364: E/AndroidRuntime(545): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 11-20 22:37:35.364: E/AndroidRuntime(545): ... 11 more 11-20 22:37:35.384: I/dalvikvm(545): threadid=7: reacting to signal 3 11-20 22:37:35.404: I/dalvikvm(545): Wrote stack trace to '/data/anr/traces.txt' </code></pre> <p>When I run this code on an Android emulator, it says, "Sorry! The application...has stopped unexpectedly. Please try again." Any help will be greatly appreciated! Thanks!</p>
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