title: Application using Tabs Crashes
body: <p>I'm building an application implementing Bluetooth , Wifi , Phone call and Sms using tabs . The MainActivity.java file is shown below . </p>
  
  <pre><code>package com.example.servicesdemo;
  
  import android.os.Bundle;
  import android.app.Activity;
  import android.app.TabActivity;
  import android.content.Intent;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.widget.TabHost;
  import android.widget.TabHost.TabSpec;
  import android.support.v4.app.NavUtils;
  
  public class MainActivity extends TabActivity {
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      TabHost tabHost = getTabHost();
  
      TabSpec btspec = tabHost.newTabSpec("Bluetooth");
      btspec.setIndicator("Bluetooth");
      Intent btIntent = new Intent(getBaseContext() , BtActivity.class);
      btspec.setContent(btIntent);
  
      TabSpec wifispec = tabHost.newTabSpec("Wifi");
      wifispec.setIndicator("Wifi");
      Intent wifiIntent = new Intent(getBaseContext(),WifiActivity.class);
      wifispec.setContent(wifiIntent);
  
      TabSpec callspec = tabHost.newTabSpec("Phone Call");
      callspec.setIndicator("Phone Call");
      Intent callIntent = new Intent(getBaseContext(),CallActivity.class);
      wifispec.setContent(callIntent);
  
      TabSpec smsspec = tabHost.newTabSpec("SMS");
      wifispec.setIndicator("SMS");
      Intent smsIntent = new Intent(getBaseContext(),SmsActivity.class);
      smsspec.setContent(smsIntent);
  
      tabHost.addTab(btspec);
      tabHost.addTab(wifispec);
      tabHost.addTab(callspec);
  
      tabHost.addTab(smsspec);
      tabHost.setCurrentTab(0);
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
      getMenuInflater().inflate(R.menu.activity_main, menu);
      return true;
  }
  
  
  }
  </code></pre>
  
  <p>I've created 4 XML files and 4 Activity files (one for each service mentioned above) . For exmaple , I've created a BtActivity.java file for the bluetooth tab , as shown below (I'll be writing more code later on) . </p>
  
  <p>BtActivity.java</p>
  
  <pre><code>package com.example.servicesdemo;
  
  import android.app.Activity;
  import android.os.Bundle;
  
  public class BtActivity extends Activity{
  public void onCreate(Bundle savedInstanceState){
      super.onCreate(savedInstanceState);
      setContentView(R.layout.bt_layout);
  }
  
  }
  </code></pre>
  
  <p>Now when I try to run the application it simply crashes . The LogCat error is shown below . </p>
  
  <pre><code>     08-29 10:44:33.810: D/AndroidRuntime(369): Shutting down VM
  08-29 10:44:33.810: W/dalvikvm(369): threadid=1: thread exiting with uncaught exception (group=0x40015560)
  08-29 10:44:33.830: E/AndroidRuntime(369): FATAL EXCEPTION: main
  08-29 10:44:33.830: E/AndroidRuntime(369): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.servicesdemo/com.example.servicesdemo.MainActivity}: java.lang.IllegalArgumentException: you must specify a way to create the tab content
  08-29 10:44:33.830: E/AndroidRuntime(369):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
  08-29 10:44:33.830: E/AndroidRuntime(369):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
  08-29 10:44:33.830: E/AndroidRuntime(369):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
  08-29 10:44:33.830: E/AndroidRuntime(369):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
  08-29 10:44:33.830: E/AndroidRuntime(369):  at android.os.Handler.dispatchMessage(Handler.java:99)
  08-29 10:44:33.830: E/AndroidRuntime(369):  at android.os.Looper.loop(Looper.java:130)
  08-29 10:44:33.830: E/AndroidRuntime(369):  at android.app.ActivityThread.main(ActivityThread.java:3683)
  08-29 10:44:33.830: E/AndroidRuntime(369):  at java.lang.reflect.Method.invokeNative(Native Method)
  08-29 10:44:33.830: E/AndroidRuntime(369):  at java.lang.reflect.Method.invoke(Method.java:507)
  08-29 10:44:33.830: E/AndroidRuntime(369):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
  08-29 10:44:33.830: E/AndroidRuntime(369):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
  08-29 10:44:33.830: E/AndroidRuntime(369):  at dalvik.system.NativeStart.main(Native Method)
  08-29 10:44:33.830: E/AndroidRuntime(369): Caused by: java.lang.IllegalArgumentException: you must specify a way to create the tab content
  08-29 10:44:33.830: E/AndroidRuntime(369):  at android.widget.TabHost.addTab(TabHost.java:202)
  08-29 10:44:33.830: E/AndroidRuntime(369):  at com.example.servicesdemo.MainActivity.onCreate(MainActivity.java:43)
  08-29 10:44:33.830: E/AndroidRuntime(369):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
  08-29 10:44:33.830: E/AndroidRuntime(369):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
  08-29 10:44:33.830: E/AndroidRuntime(369):  ... 11 more
  08-29 10:49:53.781: D/AndroidRuntime(378): Shutting down VM
  08-29 10:49:53.781: W/dalvikvm(378): threadid=1: thread exiting with uncaught exception (group=0x40015560)
  08-29 10:49:53.790: E/AndroidRuntime(378): FATAL EXCEPTION: main
  08-29 10:49:53.790: E/AndroidRuntime(378): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.servicesdemo/com.example.servicesdemo.MainActivity}: java.lang.IllegalArgumentException: you must specify a way to create the tab content
  08-29 10:49:53.790: E/AndroidRuntime(378):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
  08-29 10:49:53.790: E/AndroidRuntime(378):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
  08-29 10:49:53.790: E/AndroidRuntime(378):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
  08-29 10:49:53.790: E/AndroidRuntime(378):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
  08-29 10:49:53.790: E/AndroidRuntime(378):  at android.os.Handler.dispatchMessage(Handler.java:99)
  08-29 10:49:53.790: E/AndroidRuntime(378):  at android.os.Looper.loop(Looper.java:130)
  08-29 10:49:53.790: E/AndroidRuntime(378):  at android.app.ActivityThread.main(ActivityThread.java:3683)
  08-29 10:49:53.790: E/AndroidRuntime(378):  at java.lang.reflect.Method.invokeNative(Native Method)
  08-29 10:49:53.790: E/AndroidRuntime(378):  at java.lang.reflect.Method.invoke(Method.java:507)
  08-29 10:49:53.790: E/AndroidRuntime(378):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
  08-29 10:49:53.790: E/AndroidRuntime(378):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
  08-29 10:49:53.790: E/AndroidRuntime(378):  at dalvik.system.NativeStart.main(Native Method)
  08-29 10:49:53.790: E/AndroidRuntime(378): Caused by: java.lang.IllegalArgumentException: you must specify a way to create the tab content
  08-29 10:49:53.790: E/AndroidRuntime(378):  at android.widget.TabHost.addTab(TabHost.java:202)
  08-29 10:49:53.790: E/AndroidRuntime(378):  at com.example.servicesdemo.MainActivity.onCreate(MainActivity.java:43)
  08-29 10:49:53.790: E/AndroidRuntime(378):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
  08-29 10:49:53.790: E/AndroidRuntime(378):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
  08-29 10:49:53.790: E/AndroidRuntime(378):  ... 11 more
  08-29 10:49:56.110: I/Process(378): Sending signal. PID: 378 SIG: 9
  </code></pre>
  
  <p>I've encountered a similar problem before but in that case one of the class which I was trying to display in a tab did not extend the Activity class (That was what I was told about by the users) . </p>
  
  <p>Here's <a href="https://stackoverflow.com/questions/12143127/tab-application-crash-during-runtime">a link</a> to my previous question for reference .</p>
  
  <p>But now , I've used all classes extending the Activity class , so there should be no problem during runtime . Please help</p>