title: Cannot resolve MapActivity class on Android
body: <p>I have an application which has 11 different activities.  One of these activities is an extension of MapActivity (it is a map for data visualization).  To get to this activity the user must first travel through the launch activity, then 3 other activities.  The code to launch the MapActivity is:</p>
  
  <pre><code>Intent i = new Intent(getBaseContext(), MapVis.class);
  i.putExtra("edu.uml.cs.isense.visualizations.session_list", sessions);
  startActivity(i);
  </code></pre>
  
  <p>When this is executed I get the following output from the Log:</p>
  
  <pre><code>09-01 14:36:22.389: WARN/dalvikvm(592): Class resolved by unexpected DEX: Ledu/uml/cs/isense/visualizations/MapVis;(0x44981910):0x128260 ref [Lcom/google/android/maps/MapActivity;] Lcom/google/android/maps/MapActivity;(0x44981910):0x13d330
  09-01 14:36:22.389: WARN/dalvikvm(592): (Ledu/uml/cs/isense/visualizations/MapVis; had used a different Lcom/google/android/maps/MapActivity; during pre-verification)
  09-01 14:36:22.389: WARN/dalvikvm(592): Unable to resolve superclass of Ledu/uml/cs/isense/visualizations/MapVis; (118)
  09-01 14:36:22.389: WARN/dalvikvm(592): Link of class 'Ledu/uml/cs/isense/visualizations/MapVis;' failed
  09-01 14:36:22.389: DEBUG/AndroidRuntime(592): Shutting down VM
  09-01 14:36:22.389: WARN/dalvikvm(592): threadid=1: thread exiting with uncaught exception (group=0x4001d7f0)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592): FATAL EXCEPTION: main
  09-01 14:36:22.399: ERROR/AndroidRuntime(592): java.lang.NoClassDefFoundError: edu.uml.cs.isense.visualizations.MapVis
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at edu.uml.cs.isense.visualizations.Visualizations.onOptionsItemSelected(Visualizations.java:213)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at android.app.Activity.onMenuItemSelected(Activity.java:2195)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:730)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:143)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:855)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at com.android.internal.view.menu.IconMenuView.invokeItem(IconMenuView.java:532)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at com.android.internal.view.menu.IconMenuItemView.performClick(IconMenuItemView.java:122)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at android.view.View$PerformClick.run(View.java:8816)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at android.os.Handler.handleCallback(Handler.java:587)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at android.os.Handler.dispatchMessage(Handler.java:92)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at android.os.Looper.loop(Looper.java:123)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at android.app.ActivityThread.main(ActivityThread.java:4627)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at java.lang.reflect.Method.invokeNative(Native Method)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at java.lang.reflect.Method.invoke(Method.java:521)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at dalvik.system.NativeStart.main(Native Method)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592): Caused by: java.lang.IllegalAccessError: Class ref in pre-verified class resolved to unexpected implementation
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at dalvik.system.DexFile.defineClass(Native Method)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:209)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:203)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
  09-01 14:36:22.399: ERROR/AndroidRuntime(592):     ... 17 more
  09-01 14:36:22.409: WARN/ActivityManager(92):   Force finishing activity edu.uml.cs.isense/.visualizations.Visualizations
  09-01 14:36:22.909: WARN/ActivityManager(92): Activity pause timeout for HistoryRecord{44c84a90 edu.uml.cs.isense/.visualizations.Visualizations}
  </code></pre>
  
  <p>I do have the target set to Google APIs, this is an app meant for Android 1.5, and specifies the minsdk to be level 3 in the manifest file.  uses-library for maps is also in manifest file.</p>
  
  <pre><code>&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="edu.uml.cs.isense"
        android:versionCode="1"
        android:versionName="1.0"&gt;
      &lt;uses-permission android:name="android.permission.WRITE_SETTINGS" /&gt;
      &lt;uses-permission android:name="android.permission.INTERNET" /&gt;
      &lt;uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/&gt;
      &lt;uses-permission android:name="android.permission.CONTROL_LOCATION_UPDATES"/&gt;
      &lt;uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/&gt;
      &lt;uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS"/&gt;
      &lt;uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /&gt;
      &lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /&gt;
      &lt;application android:icon="@drawable/icon" android:label="@string/app_name"&gt;
          &lt;activity android:name=".Isense" 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;activity android:name=".experiments.Experiments" android:label="@string/app_name_experiments"/&gt;
    &lt;activity android:name=".sessions.Sessions" android:label="@string/app_name"/&gt;
    &lt;activity android:name=".people.People" android:label="@string/app_name_people"/&gt;
    &lt;activity android:name=".profile.Profile" android:label="@string/app_name"/&gt;
    &lt;activity android:name=".sensors.Sensors" android:label="@string/app_name_sensors"/&gt;
    &lt;activity android:name=".visualizations.DataTable" android:label="@string/app_name"/&gt;
    &lt;activity android:name=".visualizations.Visualizations" android:label="@string/app_name"/&gt;
    &lt;activity android:name=".sensors.DataListActivity"
                    android:label="@string/selectFile"
                    android:theme="@android:style/Theme.Dialog"
                    android:configChanges="orientation|keyboardHidden" /&gt;
          &lt;activity android:name=".sensors.Upload" android:label="@string/app_name_uploader"/&gt;
          &lt;activity android:name=".visualizations.MapVis" android:label="@string/app_name"
              android:theme="@android:style/Theme.NoTitleBar" /&gt;
          &lt;uses-library android:name="com.google.android.maps"/&gt;
  &lt;/application&gt;
      &lt;uses-sdk android:minSdkVersion="3"/&gt;
  &lt;/manifest&gt;
  </code></pre>
  
  <p>I have been at this for almost 2 days now with no results.  It seems that there are a lot of people having issues launching a MapActivity from other activities but there are no solutions anywhere.  Does anyone have a clue?  Thanks.</p>