Android-libgdx, Calling Another Activity After The Game Starts On Button Click

I faced a major problem when I need to call another activity when the button is clicked after the Game is started. The Game is called via initiate(game, ) method from AndroidApplic

Solution 1:

Define a callback interface in you LibGdx class, and use it to notify your AndroidLauncher to start the new activity.

For example in your LibGdx game class:

// Your Game class in the core packagepublicclassMyGameextendsGame {

    // Define an interface for your various callbacks to the android launcherpublicinterfaceMyGameCallback {
        publicvoidonStartActivityA();
        publicvoidonStartActivityB();
        publicvoidonStartSomeActivity(int someParameter, String someOtherParameter);
    }

    // Local variable to hold the callback implementationprivate MyGameCallback myGameCallback;

    // ** Additional **// Setter for the callbackpublicvoidsetMyGameCallback(MyGameCallback callback) {
        myGameCallback = callback;
    }

    @Override
    publicvoidcreate () {
        ...
    }

    ...

    privatevoidsomeMethod() {
        ...
        // check the calling class has actually implemented MyGameCallbackif (myGameCallback != null) {

            // initiate which ever callback method you need.if (someCondition) {
                myGameCallback.onStartActivityA();
            } elseif (someOtherCondition) {
                myGameCallback.onStartActivityB();
            } else {
                myGameCallback.onStartSomeActivity(someInteger, someString);
            }

        } else {
            Log.e("MyGame", "To use this class you must implement MyGameCallback!")
        }
    }
}

Then ensure your AndroidLauncher implements the required interface:

// Your AndroidLauncherpublicclassAndroidLauncherextendsAndroidApplicationimplementsMyGame.MyGameCallback {

    @OverrideprotectedvoidonCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        AndroidApplicationConfigurationconfig=newAndroidApplicationConfiguration();

        // create an instance of MyGame, and set the callbackMyGamemyGame=newMyGame;
        // Since AndroidLauncher implements MyGame.MyGameCallback, we can just pass 'this' to the callback setter.
        myGame.setMyGameCallback(this);

        initialize(myGame, config);
    }

    @OverridepublicvoidonStartActivityA() {
        Intentintent=newIntent(this, ActivityA.class);
        startActivity(intent);
    }

    @OverridepublicvoidonStartActivityB(){
        Intentintent=newIntent(this, ActivityB.class);
        startActivity(intent);
    }

    @OverridepublicvoidonStartSomeActivity(int someParameter, String someOtherParameter){
        Intentintent=newIntent(this, ActivityA.class);

        // do whatever you want with the supplied parameters.if (someParameter == 42) {
            intent.putExtra(MY_EXTRA, someOtherParameter);
        }
        startActivity(intent);
    }

}