Replacing google maps to open street map [closed]

Question

I'm new to this. I'm creating an android application which locates my contacts. I have tried some tutorials and it runs. but how to replace google map to open street map. I have this code.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.PositionLocator.android">
<application android:icon="@drawable/icon">
<activity android:name=".PositionLocator" android:label="@string/app_name">
</activity>        
<activity android:name=".PositionLocatorMap" android:label="@string/app_name">
  <intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
  </intent-filter>
</activity>
<uses-library android:name="com.google.android.maps"/>
</application>
<uses-permission android:name="android.permission.INTERNET"/>    
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.READ_CONTACTS"/>
</manifest> 

Answer 1

The mapsforge library seems also very promising. Seems that they are compatible to the GoogleMaps API and that you just need to exchange imports.