Unable to find explicit activity > Have you declared This Activity in your Androidmanifest.Xml

Hi, I am creating a module and need to start the activity in my module, I have set this module

Intent intent = new Intent();
        intent.setClassName("com.example.foo", "com.example.foo.MyActivity");           
        ntent.setAction(Intent.ACTION_VIEW);
        intent.setData(uri);
        Activity activity = TiApplication.getAppRootOrCurrentActivity();
        activity.startActivity(intent)

in my timodule.xml has been set :

<manifest package="com.artifex.mupdf">
 
    <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="11"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 
    <application android:label="@string/app_name"
                 android:icon="@drawable/ic_launcher"                 
                 >
 
    <activity android:name="com.example.foo.MyActivity"
 
 
                android:theme="@android:style/Theme.NoTitleBar.Fullscreen" />
            </application>
        </manifest>
    </android>

but i get error after adding the module to project :

(KrollRuntimeThread) [6449,6449] Message: 
Unable to find explicit activity class {com.example.foo/com.example.foo.MyActivity};
have you declared this activity in your AndroidManifest.xml?

How to solve this problem? Thanks for your help