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Developer Guide

The official Android Developers site offers one entire section dedicated to making your Android apps accessible so that they can be used by users who are blind or have low vision.

These are the most important links for you to read through:
Following that advice, with only very few additions to your code -- such as adding android:contentDescription to any of your controls (only exception is EditText control where you need to add android:hint instead of android:contentDescription) in your layout XML files -- your app will be more usable by the 39 million people who are fully blind and the 246 million people with low vision across the world.

Thank you for taking the time and the extra effort to make your app work for all the blind!