title: how to find main activity in apk file for robotium tests
body: <p>I have a lot of apk files and I want to write simple tests with robotium for them. I have some problems, when I tried to find Main Activitys for them, in Dropbox app as example. 
  In AndroidManifest.xml i found this:</p>
  
  <p><code>&lt;/activity&gt;
          &lt;provider android:name=".provider.ZipperedMediaProvider" android:exported="false" android:authorities="com.dropbox.android.ZipperedMediaProvider"&gt;&lt;/provider&gt;
          &lt;provider android:name=".provider.CameraUploadsProvider" android:exported="false" android:authorities="com.dropbox.android.CameraUploadsProvider"&gt;&lt;/provider&gt;
          &lt;activity android:theme="@android:01030055" android:name=".activity.DropboxBrowser"&gt;
              &lt;intent-filter &gt;
                  &lt;action android:name="android.intent.action.MAIN"&gt;&lt;/action&gt;
                  &lt;category android:name="android.intent.category.LAUNCHER"&gt;&lt;/category&gt;
              &lt;/intent-filter&gt;
              &lt;intent-filter android:label="Dropbox File Browser"&gt;
                  &lt;action android:name="com.dropbox.BROWSE"&gt;&lt;/action&gt;
                  &lt;action android:name="android.intent.action.VIEW"&gt;&lt;/action&gt;
                  &lt;action android:name="android.intent.action.EDIT"&gt;&lt;/action&gt;
                  &lt;category android:name="android.intent.category.DEFAULT"&gt;&lt;/category&gt;
                  &lt;data android:mimeType="vnd.android.cursor.dir/vnd.dropbox.entry"&gt;&lt;/data&gt;
                  &lt;data android:mimeType="vnd.android.cursor.item/vnd.dropbox.entry"&gt;&lt;/data&gt;
              &lt;/intent-filter&gt;
          &lt;/activity&gt;</code></p>
  
  <p>How to understand how main activity is called? I'm useing ApkAnalyser and I tried different classnames and other strings, but robotium test can't launch app and write that there are no tests in my project:/ (apk is re-signed in my PC) I want to understand, how to identify MainActivity from th apk files? thx </p>