ui/accessibility/BasicAccessibility/BasicAccessibility/src/main/res/layout/activity_main.xml

<!--
Copyright (C) 2013 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.
-->

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:tools="http://schemas.android.com/tools"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:gravity="center_horizontal">
    <ScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fillViewport="false">
        <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:paddingLeft="@dimen/activity_horizontal_margin"
                android:paddingRight="@dimen/activity_horizontal_margin"
                android:paddingTop="@dimen/activity_vertical_margin"
                android:paddingBottom="@dimen/activity_vertical_margin"
                tools:context=".MainActivity"
                >

            <!-- Notice the presence of nextFocusDown/nextFocusUp on the elements below. You can
            also use nextFocusLeft/nextFocusRight. This tells the system in what order elements
            should be navigated through. If not present, the system will make a guess based on
            element location in the layout. -->
            <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Buttons"
                    android:id="@+id/buttonsLabel"
                    android:layout_alignParentTop="true"
                    android:layout_alignParentLeft="true"
                    android:nextFocusDown="@+id/composeButton"/>

            <!-- This is a regular, text-based button. No contentDescription is needed, since the
                 text field sufficiently describes the action performed. -->
            <Button
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/composeButtonLabel"
                    android:id="@+id/composeButton"
                    android:layout_below="@+id/buttonsLabel"
                    android:layout_alignLeft="@+id/buttonsLabel"
                    android:nextFocusUp="@+id/buttonsLabel"
                    android:nextFocusDown="@+id/checkboxesLabel"
                    />

            <!-- The next two buttons are different types of image-based buttons. -->

            <!-- BEGIN_INCLUDE (image_content_description) -->
            <!-- Adding a contentDescription is needed for accessibility, since no text is present.
            Since the contentDescription is read verbatim, you may want to be a bit more
            descriptive than usual, such as adding "button" to the end of your description, if
            appropriate. -->
            <ImageButton
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/discardButton"
                    android:layout_alignTop="@+id/composeButton"
                    android:layout_toRightOf="@+id/composeButton"
                    android:src="@drawable/ic_action_discard"
                    android:layout_alignBottom="@+id/composeButton"
                    android:contentDescription="@string/discardButtonDescription"
                    android:scaleType="fitCenter"
                    android:nextFocusUp="@+id/buttonsLabel"
                    android:nextFocusDown="@+id/checkboxesLabel"
                    />
            <!-- END_INCLUDE (image_content_description) -->

            <ImageButton
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/infoButton"
                    android:layout_alignTop="@+id/discardButton"
                    android:layout_toRightOf="@+id/discardButton"
                    android:src="@drawable/ic_action_info"
                    android:layout_alignBottom="@+id/discardButton"
                    android:layout_alignRight="@+id/hyperspaceCheckbox"
                    android:scaleType="fitCenter"
                    android:background="?android:selectableItemBackground"
                    android:padding="5dp"
                    android:contentDescription="@string/infoButtonDescription"
                    android:nextFocusUp="@+id/buttonsLabel"
                    android:nextFocusDown="@+id/checkboxesLabel"
            />

            <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/checkboxesLabel"
                    android:id="@+id/checkboxesLabel"
                    android:layout_below="@+id/composeButton"
                    android:layout_alignLeft="@+id/composeButton"
                    android:nextFocusUp="@+id/composeButton"
                    android:nextFocusDown="@+id/jetpackCheckbox"
                    />

            <!-- Like a text-based button, checkboxes with text will often work correctly as-is.
                 If your checkboxes do not have a text attribute, you will need to add a
                 contentDescriptoin. -->
            <CheckBox
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/jetpackCheckboxLabel"
                    android:id="@+id/jetpackCheckbox"
                    android:layout_below="@+id/checkboxesLabel"
                    android:layout_alignLeft="@+id/checkboxesLabel"
                    android:checked="false"
                    android:nextFocusUp="@+id/checkboxesLabel"
                    android:nextFocusDown="@+id/hyperspaceCheckbox"
                    />

            <CheckBox
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/hyperspaceCheckboxLabel"
                    android:id="@+id/hyperspaceCheckbox"
                    android:layout_below="@+id/jetpackCheckbox"
                    android:layout_alignLeft="@+id/jetpackCheckbox"
                    android:checked="false"
                    android:nextFocusUp="@+id/jetpackCheckbox"
                    android:nextFocusDown="@+id/imagesAndTextLabel"
                    />

            <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/imagesAndTextLabel"
                    android:id="@+id/imagesAndTextLabel"
                    android:layout_below="@+id/hyperspaceCheckbox"
                    android:layout_alignLeft="@+id/hyperspaceCheckbox"
                    android:nextFocusUp="@+id/hyperspaceCheckbox"
                    android:nextFocusDown="@+id/partlyCloudImage"
                    />

            <!-- Images should have a contentDescription if they convey any meaningful
                 information. Images that are purely decorative may not need a contentDescription,
                 however. -->
            <ImageView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/partlyCloudyImage"
                    android:layout_below="@+id/imagesAndTextLabel"
                    android:layout_alignLeft="@+id/imagesAndTextLabel"
                    android:src="@drawable/partly_cloudy"
                    android:contentDescription="@string/partlyCloudyDescription"
                    android:layout_alignRight="@+id/discardButton"
                    android:nextFocusUp="@+id/imagesAndTextLabel"
                    android:nextFocusDown="@+id/customViewLabel"
                    />

            <!-- TextViews are typically self describing, so do not need extra modifications. -->
            <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textAppearance="?android:attr/textAppearanceLarge"
                    android:text="@string/temperature"
                    android:textSize="60sp"
                    android:id="@+id/temperatureText"
                    android:layout_alignTop="@+id/partlyCloudyImage"
                    android:layout_toRightOf="@+id/partlyCloudyImage"
                    android:layout_alignBottom="@+id/partlyCloudyImage"
                    android:gravity="center_vertical"
                    android:nextFocusUp="@+id/imagesAndTextLabel"
                    android:nextFocusDown="@+id/customViewLabel"
                    />

            <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/customViewLabel"
                    android:id="@+id/customViewLabel"
                    android:layout_below="@+id/partlyCloudyImage"
                    android:layout_alignLeft="@+id/partlyCloudyImage"
                    android:nextFocusUp="@+id/partlyCloudImage"
                    android:nextFocusDown="@+id/dialView"
                    />

            <!-- Custom views require additonal code changes. See DialView.java for more
                 details. -->
            <com.example.android.ui.accessibility.BasicAccessibility.DialView
                    android:layout_width="200dp"
                    android:layout_height="200dp"
                    android:id="@+id/dialView"
                    android:layout_below="@+id/customViewLabel"
                    android:layout_alignLeft="@+id/partlyCloudyImage"
                    android:nextFocusUp="@+id/customViewLabel"
                    />

        </RelativeLayout>
    </ScrollView>
</LinearLayout>