title: My app crashes when opening tablayout activity
body: <p>I followed <a href="http://www.androidhive.info/2011/08/android-tab-layout-tutorial/" rel="nofollow">this</a> tutorial to implement a tab layout to my android application. I already have an existing android app that I'm deeloping so I had to adjust the tutorial to it a bit. I'm pretty sure I did everything exactly as I'm supposed to but everytime I click the button that's supposed to open the tab layout activity, my app crashes.</p>
  
  <p>Main tabLayout activity:</p>
  
  <pre><code>public class Bifrosttabs extends TabActivity {
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_bifrosttabs);
  
      TabHost tabHost = getTabHost();
  
      //CRAFTING TAB
      TabSpec craftTabSpec = tabHost.newTabSpec("Crafting");
      craftTabSpec.setIndicator("Crafting", getResources().getDrawable(R.drawable.weaponsmith_logo));
      Intent craftIntent = new Intent(this, Bifrost.class);
      craftTabSpec.setContent(craftIntent);
  
      //ADDITION INFO TAB
      TabSpec infoTabSpec = tabHost.newTabSpec("Info");
      infoTabSpec.setIndicator("Info", getResources().getDrawable(R.drawable.craft_info));
      Intent infoIntent = new Intent(this, Bifrostinfo.class);
      infoTabSpec.setContent(infoIntent);
  
      tabHost.addTab(craftTabSpec);
      tabHost.addTab(infoTabSpec);
  }
  </code></pre>
  
  <p>Main tabLayout activity XML file:</p>
  
  <pre><code>&lt;TabHost xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@android:id/tabhost"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"&gt;
  &lt;LinearLayout
      android:orientation="vertical"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"&gt;
      &lt;TabWidget
          android:id="@android:id/tabs"
          android:layout_width="fill_parent"
          android:layout_height="wrap_content" /&gt;
      &lt;FrameLayout
          android:id="@android:id/tabcontent"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"/&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p></p>
  
  <p>Button method that opens the tab layout activity:</p>
  
  <pre><code>public void onClick (View v){
      switch (v.getId()){
      case R.id.button1:
          Intent bifrost = new Intent (MainActivity.this, Bifrosttabs.class);
          startActivity(bifrost);
          break;
  ...rest of the code for other buttons
  </code></pre>
  
  <p>Whole Logcat file:</p>
  
  <pre><code>07-15 17:57:00.084: E/jdwp(14846): Failed writing handshake bytes: Broken pipe (-1 of 14)
  07-15 17:57:06.186: E/AndroidRuntime(14846): FATAL EXCEPTION: main
  07-15 17:57:06.186: E/AndroidRuntime(14846): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.matthewstudios.gw2legendary/com.example.gw2legendary.tablayouts.Bifrosttabs}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.matthewstudios.gw2legendary/com.example.gw2legendary.craftingactivities.Bifrost}: java.lang.NullPointerException
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.os.Handler.dispatchMessage(Handler.java:99)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.os.Looper.loop(Looper.java:137)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.app.ActivityThread.main(ActivityThread.java:5041)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at java.lang.reflect.Method.invokeNative(Native Method)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at java.lang.reflect.Method.invoke(Method.java:511)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at dalvik.system.NativeStart.main(Native Method)
  07-15 17:57:06.186: E/AndroidRuntime(14846): Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.matthewstudios.gw2legendary/com.example.gw2legendary.craftingactivities.Bifrost}: java.lang.NullPointerException
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.app.ActivityThread.startActivityNow(ActivityThread.java:2023)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:347)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:749)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.widget.TabHost.setCurrentTab(TabHost.java:413)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.widget.TabHost.addTab(TabHost.java:240)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at com.example.gw2legendary.tablayouts.Bifrosttabs.onCreate(Bifrosttabs.java:34)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.app.Activity.performCreate(Activity.java:5104)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    ... 11 more
  07-15 17:57:06.186: E/AndroidRuntime(14846): Caused by: java.lang.NullPointerException
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at com.example.gw2legendary.craftingactivities.Bifrost.onCreate(Bifrost.java:160)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.app.Activity.performCreate(Activity.java:5104)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
  07-15 17:57:06.186: E/AndroidRuntime(14846):    ... 21 more
  07-15 17:57:14.967: E/fb4a(:&lt;default&gt;):MmsConfig(14952): MmsConfig.loadMmsSettings mms_config.xml missing uaProfUrl setting
  </code></pre>
  
  <p>I'm pretty sure I gave you all the important code that there is to give. If I forgot anything please let me know.</p>