How to remove padding between ImageButton?

Question

Android

You need to create a tile of pictures that, when clicked, executes a certain code. In this case, the images should be without gaps, but unfortunately some indents appear on the right side from the bottom.

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ff0000"
    >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
 
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal">
 
            <ImageButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@android:color/transparent"
                android:adjustViewBounds="true"
                android:scaleType="centerCrop"
                android:cropToPadding="true"
                android:layout_weight="1"
                android:src="@drawable/xx" />
            <ImageButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:adjustViewBounds="true"
                android:scaleType="centerCrop"
                android:background="@android:color/transparent"
                android:cropToPadding="true"
                android:layout_weight="1"
                android:src="@drawable/xx" />
            <ImageButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@android:color/transparent"
                android:adjustViewBounds="true"
                android:scaleType="centerCrop"
                android:cropToPadding="true"
                android:layout_weight="1"
                android:src="@drawable/xx" />
        </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal">
            <ImageButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:adjustViewBounds="true"
                android:scaleType="centerCrop"
                android:cropToPadding="true"
                android:background="@android:color/transparent"
                android:layout_weight="1"
                android:src="@drawable/xx" />
 
            <ImageButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@android:color/transparent"
                android:adjustViewBounds="true"
                android:cropToPadding="true"
                android:scaleType="centerCrop"
                android:layout_weight="1"
                android:src="@drawable/xx" />
            <ImageButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@android:color/transparent"
                android:adjustViewBounds="true"
                android:cropToPadding="true"
                android:scaleType="centerCrop"
                android:layout_weight="1"
                android:src="@drawable/xx" />
        </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal">
            <ImageButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:adjustViewBounds="true"
                android:scaleType="centerCrop"
                android:background="@android:color/transparent"
                android:cropToPadding="true"
                android:layout_weight="1"
                android:src="@drawable/xx" />
 
            <ImageButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:adjustViewBounds="true"
                android:cropToPadding="true"
                android:scaleType="centerCrop"
                android:background="@android:color/transparent"
                android:layout_weight="1"
                android:src="@drawable/xx" />
            <ImageButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:adjustViewBounds="true"
                android:scaleType="centerCrop"
                android:cropToPadding="true"
                android:background="@android:color/transparent"
                android:layout_weight="1"
                android:src="@drawable/xx" />
        </LinearLayout>
    </LinearLayout>
</ScrollView>

Picture with padding