Custom IndicatorManager

Guide for an implementation of a custom IndicatorManager

To get started, extend the IndicatorManager class like the following:

public class NumberIndicatorManager extends IndicatorManager {

    @Override
    public View init(@NonNull LayoutInflater inflater, @NonNull ViewGroup parent,
                     int slideAmount) {
        //We need to implement this.
        return null;
    }

    @Override
    public void select(int position) {
        //And this also.
    }
}

The next thing we need is a layout. To achieve the effect of the image above, you could do something like this:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center">

    <TextView
        android:id="@+id/introduction_indicator_number_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textColor="@android:color/white" />
</FrameLayout>

Now we need to inflate the layout and implement the logic for it in our previously created class NumberIndicatorManager:

@Override
public View init(@NonNull LayoutInflater inflater, @NonNull ViewGroup parent,
                 int slideAmount) {
    ViewGroup root = (ViewGroup) inflater.inflate(R.layout.introduction_indicator_layout_number, parent,
            false);
    text = (TextView) root.findViewById(R.id.introduction_indicator_number_text);
    this.slideAmount = slideAmount //Save the amount of slides for later.
    //Don't add the inflated View to the parent here. That will be done for you by the lib.
    return root;
}

@Override
public void select(int position) {
    text.setText((position + 1) + "/" + slideAmount);
}

Great! That should work. Now we need to pass our NumberIndicatorManager to the IntroductionBuilder:

new IntroductionBuilder(this).withSlides(generateSlides())
                .withIndicatorManager(new NumberIndicatorManager()).introduceMyself();