<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- 종료 아이콘 -->
    <item android:drawable="@drawable/icon_pop_selected" android:state_selected="true" />
    <!-- 평상시 팝 아이콘 -->
    <item android:drawable="@drawable/icon_pop"/>
</selector>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- 종료 아이콘 -->
    <item android:drawable="@drawable/icon_pop_selected" android:state_selected="true" />
    <!-- 적립 가능 포인트가 있을 때 팝 아이콘 -->
    <item android:drawable="@drawable/icon_pop_reward_ready"/>
</selector>

final LinearLayout layout = (LinearLayout) inflater.inflate(R.layout.my_view_utility_layout, parent, false);
parent.addView(layout);

new PopConfig.Builder(getApplicationContext(), "POP_UNIT_ID")
    .popUtilityLayoutHandlerClass(MyPopUtilityLayoutHandler.class)

final PopConfig popConfig = new PopConfig.Builder(this, unitIdPop)
      ...(생략)...
      .feedUnitId(feedUnitId)
      // 아래에서 소개하는 TemplatePopToolbarHolder, CustomPopToolbarHolder 등을 
      // 용도에 맞게 사용합니다
      .feedToolbarHolderClass(DefaultPopToolbarHolder.class) 
      .build();

// DefaultPopToolbarHolder 상속
public class TemplatePopToolbarHolder extends DefaultPopToolbarHolder {
    @Override
    public View getView(Activity activity, @NonNull final String unitId) {
        toolbar = new PopToolbar(activity); // PopToolbar 에서 제공하는 기본 Template 사용
        toolbar.setTitle("TemplatePopToolbarHolder");
        toolbar.setIconResource(R.mipmap.ic_launcher);
        toolbar.setBackgroundColor(Color.LTGRAY);

        addInquiryMenuItemView(activity, unitId); // 문의하기 버튼은 이 함수를 통해 간단하게 추가 가능합니다.
        addRightMenuItemView1(activity, unitId); // custom 버튼 추가 
        addRightMenuItemView2(activity);
        return toolbar;
    }

    // custom 버튼 추가는 toolbar.buildPopMenuItemView 를 사용하여 View 를 생성하고
    // toolbar.addRightMenuButton 를 사용하여 toolbar 에 추가합니다.
    private void addRightMenuItemView1(@NonNull final Activity activity, @NonNull final String unitId) {
        PopMenuImageView menuItemView = toolbar.buildPopMenuItemView(activity, R.mipmap.ic_launcher);
        menuItemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showInquiry(activity, unitId));
            }
        });
        toolbar.addRightMenuButton(menuItemView);
    }

    private void addRightMenuItemView2(@NonNull final Activity activity) {
        PopMenuImageView menuItemView = toolbar.buildPopMenuItemView(activity, R.mipmap.ic_launcher);
        menuItemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showPotto(activity);
            }
        });
        toolbar.addRightMenuButton(menuItemView);
    }
}

// DefaultPopToolbarHolder 상속
public class CustomPopToolbarHolder extends DefaultPopToolbarHolder {
    @Override
    public View getView(Activity activity, @NonNull final String unitId) {
        // 직접 구성한 layout 을 사용합니다
        ViewGroup root =  (ViewGroup) activity.getLayoutInflater().inflate(R.layout.view_pop_custom_toolbar, null);

        View buttonInquiry = root.findViewById(R.id.buttonInquiry);
        buttonInquiry.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 문의하기 페이지 열기
                showInquiry(activity, unitId);
            }
        });
        return root;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_vertical"
    android:orientation="horizontal"
    android:background="@color/bzv_white_100">

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:paddingLeft="16dp">

        <ImageView
            android:id="@+id/imageIcon"
            android:layout_width="154dp"
            android:layout_height="24dp"
            android:src="@drawable/bz_img_buzzvil_logo" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical">

        <ImageView
            android:id="@+id/buttonInquiry"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginRight="16dp"
            android:src="@drawable/bzv_ic_circle_question"
            android:tint="@color/bzv_gray_light" />

    </LinearLayout>
</LinearLayout>

interface PopFeedbackHandler {
    fun notifyFeedLaunchReward(context: Context, view: View, canUseSnackbar: Boolean, reward: Int)

    fun notifyNativeAdReward(context: Context, view: View, canUseSnackbar: Boolean, reward: Int)

    fun notifyPottoDrawOneMore(context: Context, view: View, canUseSnackbar: Boolean)

    fun notifyPottoStatus(context: Context, view: View, canUseSnackbar: Boolean)
}

public class CustomPopHeaderViewAdapter extends DefaultPopHeaderViewAdapter {
    @Nullable
    @Override
    protected View getCustomPreviewMessageLayout(Context context, ViewGroup parent, CustomPreviewMessage customPreviewMessage) {
        final LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        if (inflater == null) {
            return null;
        }
        View viewCustomPreviewMessage = inflater.inflate(R.layout.view_custom_preview_message, parent, false);
        final TextView textCustomPreviewMessageTitle = viewCustomPreviewMessage.findViewById(R.id.textCustomPreviewMessageTitle);
        textCustomPreviewMessageTitle.setText(customPreviewMessage.getMessage());
        viewCustomPreviewMessage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startDeeplinkActivity(context, customPreviewMessage.getLandingUrl());
            }
        });
        return viewCustomPreviewMessage;
    }
}

final PopConfig popConfig = new PopConfig.Builder(getApplicationContext(), UNIT_ID_POP)
        ...(생략)...
        .feedHeaderViewAdapterClass(CustomPopHeaderViewAdapter.class)
        .build();

final PopConfig popConfig = new PopConfig.Builder(getApplicationContext(), UNIT_ID_POP)
        .previewIntervalInMillis(1 * 60 * 60 * 1000) // 1 hour
        ...(생략)...
        .build();

new PopConfig.Builder(getApplicationContext(), "POP_UNIT_ID")
    .popAdMessageViewClass(MyPopAdMessageView.class)

new PopConfig.Builder(getApplicationContext(), "POP_UNIT_ID")
    .popArticleMessageViewClass(MyPopArticleMessageView.class)