It is very easy to set up parse.com to anroid project. After setting up, you can create your own backend very easily.

First of all define dependency on gradle file

dependencies {
 compile 'com.parse:parse-android:1.10.2'
}

After this, you need to initialize parse on Application Class.
APPLICATION_ID is the application id of your project at parse.com CLIENT_KEY is the client key of your project at parse.com

public class TestApplication extends Application {

@Override
public void onCreate() {
    super.onCreate();
    if (MyUtility.isConnected(this)) {
        // initializing parse here
        Parse.enableLocalDatastore(this);
        Parse.initialize(this, Constants.APPLICATION_ID, Constants.CLIENT_KEY);

        ParseFacebookUtils.initialize(this);
    }
}
}

Hope, this will help you.