‘Missing contentDescription attribute on image’ in XML

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Follow this link for solution: Android Lint contentDescription warning

Resolved this warning by setting attribute android:contentDescription
for my ImageView

android:contentDescription=”@string/desc”

Android Lint support in ADT 16 throws this warning to ensure that
image widgets provide a contentDescription

This defines text that briefly describes the content of the view. This
property is used primarily for accessibility. Since some views do not
have textual representation this attribute can be used for providing
such.

Non-textual widgets like ImageViews and ImageButtons should use the
contentDescription attribute to specify a textual description of the
widget such that screen readers and other accessibility tools can
adequately describe the user interface.

This link for explanation: Accessibility, It’s Impact and Development Resources

Many Android users have disabilities that require them to interact
with their Android devices in different ways. These include users who
have visual, physical or age-related disabilities that prevent them
from fully seeing or using a touchscreen.

Android provides accessibility features and services for helping these
users navigate their devices more easily, including text-to-speech,
haptic feedback, trackball and D-pad navigation that augments their
experience. Android application developers can take advantage of these
services to make their applications more accessible and also build
their own accessibility services.

This guide is for making your app accessible: Making Apps More Accessible

Making sure your application is accessible to all users is relatively
easy, particularly when you use framework-provided user interface
components. If you only use these standard components for your
application, there are just a few steps required to ensure your
application is accessible:

  1. Label your ImageButton, ImageView, EditText, CheckBox and other user
    interface controls using the android:contentDescription attribute.

  2. Make all of your user interface elements accessible with a directional
    controller, such as a trackball or D-pad.

  3. Test your application by turning on accessibility services like TalkBack
    and Explore by Touch,
    and try using your application using only directional controls.

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