You need to specify the parent package that contains the packages which contain all of your activities. Then you refer to your activities as normal java classes with the . operator.
Here is the android manifest of my own android
contest entry, it has a package of activities called org.technocore.ui which has a subpackage of activities called org.technocore.ui.shareable
I refer to the activities in the org.technocore.ui.shareable package by putting a ".shareable." in front of the activity name
Using xml Syntax Highlighting
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.technocore.ui">
<uses-permission id="android.permission.READ_CONTACTS"/>
<uses-permission id="android.permission.CALL_PHONE"/>
<application android:icon="@drawable/icon">
<activity class=".Geocast" android:label="@string/main_title">
<intent-filter>
<action android:value="android.intent.action.MAIN" />
<category android:value="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity class=".GeocastMap" android:label="@string/map_title">
<intent-filter>
<action android:value="android.intent.action.VIEW" />
<category android:value="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity class=".PictureCapturer" android:label="Picture Capturer">
<intent-filter>
<action android:value="android.intent.action.VIEW" />
<category android:value="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity class=".shareable.ShareableFullView" android:label="Shareable View">
<intent-filter>
<action android:value="android.intent.action.VIEW" />
<category android:value="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
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