Google provides the individual smartphone manufacturers with a standard version of Android. Here you will find various functions for barrier-free use under the operating aids, which can be subdivided into:
The voice output in the Android system is called "TalkBack". This function informs about warnings and notifications on the smartphone. TalkBack is activated in the device settings or by pressing both volume buttons for three seconds.
If you only want to have individual sections or elements read aloud or image elements described, there is the "Read aloud" function. A single element is selected by tapping and several objects are selected by deleting them. If you now press the play button, all markings are read out one after the other. You can pause, play, fast-forward or rewind the reading aloud and adjust the speaking speed.
As an alternative to touchscreen operation, the smartphone can also be operated using external switches, keyboards or mice. These devices are connected to the smartphone via USB cable or wirelessly via Bluetooth. One or more keys of the keyboard can be assigned to an action. With switch control, the individual selection points on the smartphone light up in sequence and are selected by pressing the switch.
Alternatively, a Braille display can also be connected via Bluetooth. This can be combined with "TalkBack", which allows texts to be displayed in speech or Braille. The smartphone can also be controlled via a Braille display, but only with certain models. To use this function, an app must be downloaded from the store. An overview and instructions can be found on the manufacturer's website.
For an individual adaptation of the screen, the display, font size, contrast and colour options can be changed. The adjustment of the font and display is only applicable from Android 7.0 on, the color and contrast settings already from Android 5.0. In a color correction, a red-green vision weakness as well as a blue-yellow vision weakness can be compensated.
There are two ways to enlarge the screen in the meantime. Tap the screen three times to enlarge the corresponding section. You can now move the zoomed-in window and adjust the zoom level by contracting or expanding the fingers. By tapping three times again, the zoom is stopped again. Alternatively, the zooming can also be selected through the help icon. Navigation in the zoom window works in the same way.
In addition, subtitles can also be activated. These can be customized in language, text size, style, color and background. Voice control is currently only available in English and is still being tested.