title: android.view.InflateException: Binary XML file line #10: Error inflating class fragment
body: <p>I created an app by following the tutorial at <a href="http://www.techotopia.com/index.php/Using_Fragments_in_Android_-_A_Worked_Example" rel="nofollow noreferrer">http://www.techotopia.com/index.php/Using_Fragments_in_Android_-_A_Worked_Example</a>,
  but I have a error.</p>
  
  <p><strong>LogCat:</strong></p>
  
  <pre><code>05-02 08:16:22.044: D/dalvikvm(1846): Late-enabling CheckJNI
  05-02 08:16:22.080: D/AndroidRuntime(1846): Shutting down VM
  05-02 08:16:22.080: W/dalvikvm(1846): threadid=1: thread exiting with uncaught exception (group=0xa4d81b20)
  05-02 08:16:22.096: E/AndroidRuntime(1846): FATAL EXCEPTION: main
  05-02 08:16:22.096: E/AndroidRuntime(1846): Process: com.example.myfragmentexample, PID: 1846
  05-02 08:16:22.096: E/AndroidRuntime(1846): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myfragmentexample/com.example.myfragmentexample.MainActivity}: android.view.InflateException: Binary XML file line #10: Error inflating class fragment
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.os.Handler.dispatchMessage(Handler.java:102)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.os.Looper.loop(Looper.java:136)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.app.ActivityThread.main(ActivityThread.java:5017)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at java.lang.reflect.Method.invokeNative(Native Method)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at java.lang.reflect.Method.invoke(Method.java:515)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at dalvik.system.NativeStart.main(Native Method)
  05-02 08:16:22.096: E/AndroidRuntime(1846): Caused by: android.view.InflateException: Binary XML file line #10: Error inflating class fragment
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.app.Activity.setContentView(Activity.java:1929)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at com.example.myfragmentexample.MainActivity.onCreate(MainActivity.java:12)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.app.Activity.performCreate(Activity.java:5231)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     ... 11 more
  05-02 08:16:22.096: E/AndroidRuntime(1846): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.example.fragmentexample.ToolbarFragment: make sure class name exists, is public, and has an empty constructor that is public
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.app.Fragment.instantiate(Fragment.java:597)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.app.Fragment.instantiate(Fragment.java:561)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.app.Activity.onCreateView(Activity.java:4778)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:689)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     ... 21 more
  05-02 08:16:22.096: E/AndroidRuntime(1846): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.fragmentexample.ToolbarFragment" on path: DexPathList[[zip file "/data/app/com.example.myfragmentexample-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.myfragmentexample-1, /system/lib]]
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     at android.app.Fragment.instantiate(Fragment.java:583)
  05-02 08:16:22.096: E/AndroidRuntime(1846):     ... 24 more
  </code></pre>
  
  <p><strong>MainActivity.java:</strong></p>
  
  <pre><code>package com.example.myfragmentexample;
  import android.os.Bundle;
  import android.support.v4.app.FragmentActivity;
  
  public class MainActivity extends FragmentActivity implements
          ToolbarFragment.ToolbarListener {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
      }
  
  
      public void onButtononClick(int fontsize, String text) {
          TextFragment textfragment = (TextFragment) getSupportFragmentManager()
                  .findFragmentById(R.id.text_fragment);
          textfragment.zmienWlasciwosci(fontsize, text);
  
      }
  
  }
  </code></pre>
  
  <p><strong>activity_main.xml:</strong></p>
  
  <pre><code>&lt;RelativeLayout 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"
      tools:context=".MainActivity" &gt;
  
      &lt;fragment
          android:id="@+id/toolbar_fragment"
          android:name="com.example.fragmentexample.ToolbarFragment"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_alignParentLeft="true"
          android:layout_alignParentTop="true"
          tools:layout="@layout/toolbar_fragment" /&gt;
  
      &lt;fragment
          android:id="@+id/text_fragment"
          android:name="com.example.fragmentexample.TextFragment"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_alignParentLeft="true"
          android:layout_centerVertical="true"
          tools:layout="@layout/text_fragment" /&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p><strong>ToolbarFragment.java:</strong></p>
  
  <pre><code>package com.example.myfragmentexample;
  
  import android.app.Activity;
  import android.os.Bundle;
  import android.support.v4.app.Fragment;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.Button;
  import android.widget.EditText;
  import android.widget.SeekBar;
  import android.widget.SeekBar.OnSeekBarChangeListener;
  
  public class ToolbarFragment extends Fragment implements
          OnSeekBarChangeListener {
  
      private static int seekvalue = 10;
      private static EditText edittext;
  
      ToolbarListener activityCallback;
  
      public interface ToolbarListener {
          public void onButtononClick(int position, String text);
      }
  
      @Override
      public void onAttach(Activity activity) {
          super.onAttach(activity);
          try {
              activityCallback = (ToolbarListener) activity;
          } catch (ClassCastException e) {
              throw new ClassCastException(activity.toString()
                      + " must implement ToolbarListener");
          }
      }
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
              Bundle savedInstanceState) {
  
          View view = inflater.inflate(R.layout.toolbar_fragment, container,
                  false);
  
          edittext = (EditText) view.findViewById(R.id.editText);
          SeekBar seekbar = (SeekBar) view.findViewById(R.id.seekBar);
          seekbar.setOnSeekBarChangeListener(this);
          Button button = (Button) view.findViewById(R.id.button);
          button.setOnClickListener(new View.OnClickListener() {
  
              @Override
              public void onClick(View v) {
                  buttonClicked(v);
  
              }
          });
  
          return view;
      }
  
      public void buttonClicked(View view) {
          activityCallback.onButtononClick(seekvalue, edittext.getText()
                  .toString());
  
      }
  
      @Override
      public void onProgressChanged(SeekBar arg0, int arg1, boolean arg2) {
          seekvalue = arg1;
  
      }
  
      @Override
      public void onStartTrackingTouch(SeekBar arg0) {
          // TODO Auto-generated method stub
  
      }
  
      @Override
      public void onStopTrackingTouch(SeekBar arg0) {
          // TODO Auto-generated method stub
  
      }
  
  }
  </code></pre>
  
  <p><strong>toolbar_fragment.xml:</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent" &gt;
  
      &lt;EditText 
          android:id="@+id/editText" 
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_centerHorizontal="true"
          android:layout_alignParentTop="true"
          android:layout_marginTop="16dp"
          android:ems="10"
          android:inputType="text"&gt;
          &lt;requestFocus /&gt;
      &lt;/EditText&gt;
  
      &lt;SeekBar
          android:id="@+id/seekBar"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_alignParentLeft="true"
          android:layout_below="@+id/editText"
          android:layout_marginTop="14dp" /&gt;
  
      &lt;Button
          android:id="@+id/button"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_centerHorizontal="true"
          android:layout_marginTop="17dp"
          android:layout_below="@+id/seekBar"
          android:text="@string/button_text" /&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p><strong>TextFragment.java:</strong></p>
  
  <pre><code>package com.example.myfragmentexample;
  
  import android.os.Bundle;
  import android.support.v4.app.Fragment;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.TextView;
  
  public class TextFragment extends Fragment {
      private static TextView textview;
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
              Bundle savedInstanceState) {
          View view = inflater.inflate(R.layout.text_fragment, container, false);
  
          textview = (TextView) view.findViewById(R.id.textView1);
  
          return view;
      }
  
      public void zmienWlasciwosci (int fontsize, String text){
          textview.setTextSize(fontsize);
          textview.setText(text);
      }
  
  }
  </code></pre>
  
  <p><strong>text_fragment.xml:</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent" &gt;
  
      &lt;TextView
         android:id="@+id/textView1"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_centerHorizontal="true"
         android:layout_centerVertical="true"
         android:text="@string/text_label"
         android:textAppearance="?android:attr/textAppearanceLarge" /&gt; 
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p><strong>AndroidManifest:</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.example.myfragmentexample"
      android:versionCode="1"
      android:versionName="1.0" &gt;
  
      &lt;uses-sdk
          android:minSdkVersion="8"
          android:targetSdkVersion="19" /&gt;
  
      &lt;application
          android:allowBackup="true"
          android:icon="@drawable/ic_launcher"
          android:label="@string/app_name"
          android:theme="@style/AppTheme" &gt;
          &lt;activity
              android:name="com.example.myfragmentexample.MainActivity"
              android:label="@string/app_name" &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>I read a lot of posts about this error, but I couldn't find anything wrong in my code. I extended <code>android.support.v4.app.FragmentActivity</code>. </p>