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The application has stopped responding

Discussion in 'Android Development' started by chandradeor, Jul 5, 2013.

  1. chandradeor

    chandradeor Lurker
    Thread Starter

    Hi Friends i am new to android application development. I have just download adt bundle and created an android project.

    I want to do some thing on the page loading(means when my application opens it should read the wifi data and display the data in the page controls like TextEdit.

    Where should i put the code so that it works like a pageload event.
    Plz suggest
    Thank u all in advance
     


  2. LilBit

    LilBit Extreme Android User

  3. chandradeor

    chandradeor Lurker
    Thread Starter

    Hi frnds i am new to android application development using java

    I want to receive multicast data on a android application when it loads. I want that whenever the Activity loads it should start receiving multicast data and display in the textbox. But when i run this code on any emulator or Real Android device it show an error The app has stopped responding and also it does not receives any dataBelow
    is the code



    [HIGH]package com.example.cdttiming;

    import java.io.IOException;
    import java.net.DatagramPacket;
    import java.net.InetAddress;
    import java.net.MulticastSocket;
    import java.net.UnknownHostException;

    import android.app.Activity;
    import android.content.Context;
    import android.net.wifi.WifiManager;
    import android.os.Bundle;
    import android.view.Menu;
    import android.widget.EditText;


    public class MainActivity extends Activity
    {

    @Override

    protected void onCreate(Bundle savedInstanceState)
    {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    EditText Seconds;
    Seconds =(EditText)findViewById(R.id.Seconds);

    WifiManager wm = (WifiManager)getSystemService(Context.WIFI_SERVICE);
    WifiManager.MulticastLock multicastLock = wm.createMulticastLock("mydebuginfo");
    multicastLock.setReferenceCounted(true);
    multicastLock.acquire();

    InetAddress ia = null;
    byte[] buffer = new byte[65535];
    MulticastSocket ms = null;
    int port = 4321;
    try
    {
    ia = InetAddress.getByName("226.1.1.1");
    DatagramPacket dp = new DatagramPacket(buffer, buffer.length,ia,port);
    ms = new MulticastSocket(port);
    ms.setReuseAddress(true);
    ms.joinGroup(ia);


    // while (true)
    for(int i=0;i<10;i++)
    {
    ms.receive(dp);
    String s = new String(dp.getData(),0,dp.getLength());
    Seconds.setText(s);
    }



    }
    catch (UnknownHostException e)
    {
    Seconds.setText(e.getMessage());

    }
    catch (IOException e)
    {
    Seconds.setText(e.getMessage());
    }



    }
    [/HIGH]

    Logcat output


    [HIGH]
    07-09 14:26:53.116: E/AndroidRuntime(383): FATAL EXCEPTION: main
    07-09 14:26:53.116: E/AndroidRuntime(383): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.cdttiming/com.example.cdttiming.MainActivity}: android.os.NetworkOnMainThreadException
    07-09 14:26:53.116: E/AndroidRuntime(383): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1815)
    07-09 14:26:53.116: E/AndroidRuntime(383): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831)
    07-09 14:26:53.116: E/AndroidRuntime(383): at android.app.ActivityThread.access$500(ActivityThread.java:122)
    07-09 14:26:53.116: E/AndroidRuntime(383): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024)
    07-09 14:26:53.116: E/AndroidRuntime(383): at android.os.Handler.dispatchMessage(Handler.java:99)
    07-09 14:26:53.116: E/AndroidRuntime(383): at android.os.Looper.loop(Looper.java:132)
    07-09 14:26:53.116: E/AndroidRuntime(383): at android.app.ActivityThread.main(ActivityThread.java:4123)
    07-09 14:26:53.116: E/AndroidRuntime(383): at java.lang.reflect.Method.invokeNative(Native Method)
    07-09 14:26:53.116: E/AndroidRuntime(383): at java.lang.reflect.Method.invoke(Method.java:491)
    07-09 14:26:53.116: E/AndroidRuntime(383): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
    07-09 14:26:53.116: E/AndroidRuntime(383): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
    07-09 14:26:53.116: E/AndroidRuntime(383): at dalvik.system.NativeStart.main(Native Method)
    07-09 14:26:53.116: E/AndroidRuntime(383): Caused by: android.os.NetworkOnMainThreadException
    07-09 14:26:53.116: E/AndroidRuntime(383): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1077)
    07-09 14:26:53.116: E/AndroidRuntime(383): at dalvik.system.BlockGuard$WrappedNetworkSystem.recv(BlockGuard.java:332)
    07-09 14:26:53.116: E/AndroidRuntime(383): at org.apache.harmony.luni.net.PlainDatagramSocketImpl.doRecv(PlainDatagramSocketImpl.java:165)
    07-09 14:26:53.116: E/AndroidRuntime(383): at org.apache.harmony.luni.net.PlainDatagramSocketImpl.receive(PlainDatagramSocketImpl.java:174)
    07-09 14:26:53.116: E/AndroidRuntime(383): at java.net.DatagramSocket.receive(DatagramSocket.java:391)
    07-09 14:26:53.116: E/AndroidRuntime(383): at com.example.cdttiming.MainActivity.onCreate(MainActivity.java:50)
    07-09 14:26:53.116: E/AndroidRuntime(383): at android.app.Activity.performCreate(Activity.java:4397)
    07-09 14:26:53.116: E/AndroidRuntime(383): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
    07-09 14:26:53.116: E/AndroidRuntime(383): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1779)
    07-09 14:26:53.116: E/AndroidRuntime(383): ... 11 more

    [/HIGH]

    plz tell me what is the problem. Thank u all in advance
     
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