res/layout/gallery_grid_item_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
    Copyright (C) 2015 The Android Open Source Project

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

         http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
-->
<com.android.messaging.ui.mediapicker.GalleryGridItemView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="@dimen/gallery_image_cell_size"
    android:background="@color/gallery_image_default_background"
    android:clickable="true">

    <!-- Thumbnail for image and video contents. -->
    <com.android.messaging.ui.AsyncImageView
        android:id="@+id/thumbnail"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="centerCrop" />

    <!-- Additional info such as icon, name and etc. -->
    <RelativeLayout
        android:id="@+id/additional_info"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:orientation="vertical"
        android:visibility="gone" >

        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_above="@id/file_info" >
            <ImageView
                android:id="@+id/icon"
                android:layout_width="@dimen/gallery_icon_size"
                android:layout_height="@dimen/gallery_icon_size"
                android:layout_gravity="center"
                android:scaleType="fitCenter"
                android:background="@color/background_item_transparent"
                android:visibility="gone" />
        </FrameLayout>

        <!-- File info for audio contents only -->
        <LinearLayout
            android:id="@+id/file_info"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="4dp"
            android:paddingLeft="4dp"
            android:paddingRight="4dp"
            android:orientation="vertical"
            android:visibility="gone" >

            <TextView
                android:id="@+id/file_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:singleLine="true"
                android:ellipsize="end"
                android:textAppearance="@android:style/TextAppearance.Material.Subhead" />

            <TextView
                android:id="@+id/file_type"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:singleLine="true"
                android:ellipsize="end"
                android:gravity="right"
                android:textAppearance="@android:style/TextAppearance.Material.Caption" />
        </LinearLayout>
    </RelativeLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:focusableInTouchMode="true"
        android:background="@drawable/gallery_image_background_selector" />

    <CheckBox
        android:id="@+id/checkbox"
        style="@style/GalleryGridItemViewCheckBoxStyle"
        android:button="@drawable/gallery_checkbox_selector"
        android:background="@null"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="top|end"
        android:paddingTop="4dp"
        android:visibility="gone"
        android:contentDescription="@string/gallery_checkbox_content_description" />

</com.android.messaging.ui.mediapicker.GalleryGridItemView>