title: Error inflating fragment
body: <p>I'm just trying to follow along with the example code on android dev to inflate a fragment in an activity. I have a more complicated project I'm working but I'm getting the same error as this simple one here. Can anyone point me in the right direction?    </p>
  
  <p>The class that extends fragment</p>
  
  <pre><code>package com.example.fragtest;
  
  
  import android.support.v4.app.Fragment;
  import android.os.Bundle;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  
  public class FragOne extends Fragment {
  
      @Override
      public void onCreate(Bundle savedInstanceState){
          super.onCreate(savedInstanceState);
      }
      @Override
      public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState){
          return inflater.inflate(R.layout.activity_main, container,false);
      }
  
  }
  </code></pre>
  
  <p>The class that extends FragmentActivity</p>
  
  <pre><code>package com.example.fragtest;
  
  import android.os.Bundle;
  import android.view.Menu;
  import android.support.v4.app.FragmentActivity;
  
  public class MainActivity extends FragmentActivity {
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
      }
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          getMenuInflater().inflate(R.menu.activity_main, menu);
          return true;
      }
  
  
  
  }
  </code></pre>
  
  <p>The xml where the fragment is</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent" &gt;
  
     &lt;fragment android:name="com.example.fragtest.FragOne"
         android:id="@+id/frag"
         android:layout_width="match_parent"
         android:layout_height="match_parent" /&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>The manifest where the activity name is set</p>
  
  <pre><code>&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.example.fragtest"
      android:versionCode="1"
      android:versionName="1.0" &gt;
  
      &lt;uses-sdk
          android:minSdkVersion="11"
          android:targetSdkVersion="15" /&gt;
  
      &lt;application
          android:icon="@drawable/ic_launcher"
          android:label="@string/app_name"
          android:theme="@style/AppTheme" &gt;
          &lt;activity
              android:name=".MainActivity"
              android:label="@string/title_activity_main" &gt;
              &lt;intent-filter&gt;
                  &lt;action android:name="android.intent.action.MAIN" /&gt;
  
                  &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
              &lt;/intent-filter&gt;
          &lt;/activity&gt;
      &lt;/application&gt;
  
  &lt;/manifest&gt;
  </code></pre>
  
  <p>Here is the logcat output</p>
  
  <pre><code>07-17 23:45:09.053: E/AndroidRuntime(560): FATAL EXCEPTION: main
  07-17 23:45:09.053: E/AndroidRuntime(560): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fragtest/com.example.fragtest.MainActivity}: android.view.InflateException: Binary XML file line #7: Error inflating class fragment
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.app.ActivityThread.access$600(ActivityThread.java:122)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.os.Handler.dispatchMessage(Handler.java:99)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.os.Looper.loop(Looper.java:137)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.app.ActivityThread.main(ActivityThread.java:4340)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at java.lang.reflect.Method.invokeNative(Native Method)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at java.lang.reflect.Method.invoke(Method.java:511)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at dalvik.system.NativeStart.main(Native Method)
  07-17 23:45:09.053: E/AndroidRuntime(560): Caused by: android.view.InflateException: Binary XML file line #7: Error inflating class fragment
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:697)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at com.example.fragtest.FragOne.onCreateView(FragOne.java:18)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:846)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1061)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1160)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:272)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:669)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:251)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.app.Activity.setContentView(Activity.java:1835)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at com.example.fragtest.MainActivity.onCreate(MainActivity.java:12)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.app.Activity.performCreate(Activity.java:4465)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
  07-17 23:45:09.053: E/AndroidRuntime(560):  ... 11 more
  07-17 23:45:09.053: E/AndroidRuntime(560): Caused by: java.lang.IllegalArgumentException: Binary XML file line #7: Duplicate id 0x7f080000, tag null, or parent id 0x0 with another fragment for com.example.fragtest.FragOne
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:277)
  07-17 23:45:09.053: E/AndroidRuntime(560):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:669)
  07-17 23:45:09.053: E/AndroidRuntime(560):  ... 30 more
  </code></pre>