title: Fragment - InstantiationException: no empty Constructor -> Google Maps v2?
body: <p>I get this error message, when I open a closed App again via App-Change button:</p>
  
  <pre class="lang-none prettyprint-override"><code>Caused by: java.lang.InstantiationException: can't instantiate class com.*.FragmentContact$1; no empty constructor
  </code></pre>
  
  <p>I've found several tips about Inner-Classes and to make them static etc. But this  FragmentContact is a <strong>public</strong> class in a <strong>*.java-file</strong> and <strong>has a public empty constructor</strong>. 
  I'm using Google Maps Api v2 in this project and do a trick somewhere from the internet to setup my MapView. Look here:</p>
  
  <pre><code>@Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
      View v = inflater.inflate(R.layout.fragment_contact, null);
  
      try {
          MapsInitializer.initialize(this.getActivity().getApplicationContext());
      } catch (GooglePlayServicesNotAvailableException e) {
          e.printStackTrace();
      }
  
      fragment = new SupportMapFragment() {
          @Override
          public void onActivityCreated(Bundle savedInstanceState) {
              super.onActivityCreated(savedInstanceState);
              mMap = fragment.getMap();
              if (mMap != null) {
                  setupMap();
              }
          }
      };
  
      getFragmentManager().beginTransaction().replace(R.id.fragment_orte_map_parent, fragment).commit();
  
      return v;
  }
  </code></pre>
  
  <p>When I cut this MapView-thing out everything work fine. Maybe someone can explain what I'm doing wrong.</p>
  
  <p>My complete Stacktrace:</p>
  
  <pre class="lang-none prettyprint-override"><code>FATAL EXCEPTION: main
  java.lang.RuntimeException: Unable to start activity ComponentInfo{com.*/com.*.MainActivity}: android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment com.*.FragmentContact$1: make sure class name exists, is public, and has an empty constructor that is public
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2307)
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2357)
     at android.app.ActivityThread.access$600(ActivityThread.java:153)
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247)
     at android.os.Handler.dispatchMessage(Handler.java:99)
     at android.os.Looper.loop(Looper.java:137)
     at android.app.ActivityThread.main(ActivityThread.java:5226)
     at java.lang.reflect.Method.invokeNative(Native Method)
     at java.lang.reflect.Method.invoke(Method.java:511)
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
     at dalvik.system.NativeStart.main(Native Method)
  Caused by: android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment com.*.FragmentContact$1: make sure class name exists, is public, and has an empty constructor that is public
     at android.support.v4.app.Fragment.instantiate(Fragment.java:405)
     at android.support.v4.app.FragmentState.instantiate(Fragment.java:97)
     at android.support.v4.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1767)
     at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:208)
     at com.*.MainActivity.onCreate(MainActivity.java:20)
     at android.app.Activity.performCreate(Activity.java:5104)
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2261)
     ... 11 more
  Caused by: java.lang.InstantiationException: can't instantiate class com.*.FragmentContact$1; no empty constructor
     at java.lang.Class.newInstanceImpl(Native Method)
     at java.lang.Class.newInstance(Class.java:1319)
     at android.support.v4.app.Fragment.instantiate(Fragment.java:394)
     ... 18 more
  </code></pre>