Fix bug building testapp

Needed the exported flag

Signed-off-by: Alex Saveau <saveau.alexandre@gmail.com>

Author: SUPERCILEX

testapp/src/main/AndroidManifest.xml

@@ -16,7 +16,7 @@
             android:theme="@style/AppTheme"
             tools:ignore="GoogleAppIndexingWarning">
 
-        <activity android:name=".MainActivity">
+        <activity android:name=".MainActivity" android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />