Signal-Android/res/layout/attachment_type_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:app="http://schemas.android.com/apk/res-auto"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:background="?attachment_type_selector_background"
              android:elevation="4dp"
              android:padding="16dp">

    <LinearLayout android:orientation="horizontal"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:weightSum="4">

        <LinearLayout android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:layout_weight="1"
                      android:gravity="center"
                      android:orientation="vertical">

            <org.thoughtcrime.securesms.components.CircleColorImageView
                    android:id="@+id/gallery_button"
                    android:layout_width="60dp"
                    android:layout_height="60dp"
                    android:src="@drawable/ic_image_white_36dp"
                    android:scaleType="center"
                    android:elevation="4dp"
                    app:circleColor="@color/purple_400"/>

            <TextView android:layout_marginTop="10dp"
                      style="@style/AttachmentTypeLabel"
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      android:text="@string/attachment_type_selector__image"/>

        </LinearLayout>

        <LinearLayout android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:gravity="center"
                      android:layout_weight="1"
                      android:orientation="vertical">

            <org.thoughtcrime.securesms.components.CircleColorImageView
                    android:id="@+id/audio_button"
                    android:layout_width="60dp"
                    android:layout_height="60dp"
                    android:src="@drawable/ic_headset_white_36dp"
                    android:scaleType="center"
                    android:elevation="4dp"
                    app:circleColor="@color/orange_400"/>

            <TextView android:layout_marginTop="10dp"
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      style="@style/AttachmentTypeLabel"
                      android:text="@string/attachment_type_selector__audio"/>

        </LinearLayout>

        <LinearLayout android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:gravity="center"
                      android:layout_weight="1"
                      android:orientation="vertical">

            <org.thoughtcrime.securesms.components.CircleColorImageView
                    android:id="@+id/video_button"
                    android:layout_width="60dp"
                    android:layout_height="60dp"
                    android:src="@drawable/ic_local_movies_white_36dp"
                    android:scaleType="center"
                    android:elevation="4dp"

                    app:circleColor="@color/red_400"/>

            <TextView android:layout_marginTop="10dp"
                      style="@style/AttachmentTypeLabel"
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      android:text="@string/attachment_type_selector__video"/>

        </LinearLayout>

        <LinearLayout android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:gravity="center"
                      android:orientation="vertical"
                      android:layout_weight="1">

            <org.thoughtcrime.securesms.components.CircleColorImageView
                    android:id="@+id/contact_button"
                    android:layout_width="60dp"
                    android:layout_height="60dp"
                    android:src="@drawable/ic_person_white_36dp"
                    android:scaleType="center"
                    android:elevation="4dp"
                    app:circleColor="@color/blue_400"/>

            <TextView android:layout_marginTop="10dp"
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      style="@style/AttachmentTypeLabel"
                      android:text="@string/attachment_type_selector__contact"/>

        </LinearLayout>

    </LinearLayout>

    <LinearLayout android:orientation="horizontal"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:layout_marginTop="16dp"
                  android:weightSum="4">

        <LinearLayout android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:layout_weight="1"
                      android:gravity="center"
                      android:orientation="vertical">

            <org.thoughtcrime.securesms.components.CircleColorImageView
                    android:id="@+id/camera_button"
                    android:layout_width="60dp"
                    android:layout_height="60dp"
                    android:src="@drawable/ic_camera_white_36dp"
                    android:scaleType="center"
                    android:elevation="4dp"
                    app:circleColor="@color/green_400"/>

            <TextView android:layout_marginTop="10dp"
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      android:gravity="center"
                      style="@style/AttachmentTypeLabel"
                      android:text="@string/attachment_type_selector__camera"/>

        </LinearLayout>

        <LinearLayout android:id="@+id/location_linear_layout"
                      android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:layout_weight="1"
                      android:gravity="center"
                      android:orientation="vertical">

            <org.thoughtcrime.securesms.components.CircleColorImageView
                    android:id="@+id/location_button"
                    android:layout_width="60dp"
                    android:layout_height="60dp"
                    android:src="@drawable/ic_location_on_white_36dp"
                    android:scaleType="center"
                    android:elevation="4dp"
                    app:circleColor="@color/blue_grey_400"/>

            <TextView android:layout_marginTop="10dp"
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      style="@style/AttachmentTypeLabel"
                      android:text="@string/attachment_type_selector__location"/>

        </LinearLayout>


        <LinearLayout android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:layout_weight="1"
                      android:gravity="center"
                      android:orientation="vertical">

            <org.thoughtcrime.securesms.components.CircleColorImageView
                    android:id="@+id/giphy_button"
                    android:layout_width="60dp"
                    android:layout_height="60dp"
                    android:src="@drawable/ic_gif_white_36dp"
                    android:scaleType="center"
                    android:elevation="4dp"
                    app:circleColor="@color/cyan_400"/>

            <TextView android:layout_marginTop="10dp"
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      style="@style/AttachmentTypeLabel"
                      android:text="GIF"/>

        </LinearLayout>

        <LinearLayout android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:layout_weight="1"
                      android:gravity="center"
                      android:orientation="vertical">

            <org.thoughtcrime.securesms.components.CircleColorImageView
                    android:id="@+id/close_button"
                    android:layout_width="60dp"
                    android:layout_height="60dp"
                    android:src="@drawable/ic_keyboard_arrow_down_white_36dp"
                    android:scaleType="center"
                    android:elevation="4dp"
                    app:circleColor="@color/gray50"/>

            <TextView android:layout_marginTop="10dp"
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content"
                      style="@style/AttachmentTypeLabel"
                      android:text=" "/>

        </LinearLayout>


    </LinearLayout>

</LinearLayout>