Enable and Disable Android Accessibility Settings from the Command Line using ADB (Font scale, talkback, color blind)

change-accessibility-settings-with-adb.md

Using ADB to control Accessbility settings for easier testing with Android Emulators + Real Devices

It's a lot easier to test accessibility on the fly using ADB. This gist attempts to make the days of navigating through the Android device settings UI to change Accessibility settings obsolete.

These ADB commands will hopefully encourage Android developers to test and use their apps with common Accessiblility settings enabled.

Credit to James Nitsch for inspiring this, and for figuring out the put commands to enable these settings.

Font Scale (Font Size -- Testing Dynamic Text)

adb shell settings put system font_scale 0.85 (small)

adb shell settings put system font_scale 1.0 (default)

adb shell settings put system font_scale 1.15 (large)

adb shell settings put system font_scale 1.30 (largest)

adb shell settings put system font_scale 2.0 (sizes like this can only be achieved with custom adb setting, not from ui)

Talkback

disable talkback

adb shell settings put secure enabled_accessibility_services com.android.talkback/com.google.android.marvin.talkback.TalkBackService

enable talkback

adb shell settings put secure enabled_accessibility_services com.google.android.marvin.talkback/com.google.android.marvin.talkback.TalkBackService

Color

Properties:

accessibility_display_daltonizer_enabled=1
accessibility_display_daltonizer=11
accessibility_display_daltonizer=12
accessibility_display_daltonizer=13

Examples:

adb shell settings put secure accessibility_display_daltonizer_enabled 1

adb shell settings put secure accessibility_display_daltonizer 0

adb shell settings put secure accessibility_display_daltonizer 11

adb shell settings put secure accessibility_display_daltonizer 12

adb shell settings put secure accessibility_display_daltonizer 13

0 == Monochromatic
11 is for Deuteranomaly (red-green)
12 is for Protanomaly (red-green)
13 is for Tritanomaly (blue-yellow)

Color Inversion

Property: accessibility_display_inversion_enabled=1

ADB Command: adb shell settings put secure accessibility_display_inversion_enabled 1

High Contrast Text

Property: high_text_contrast_enabled=1

ADB Command: adb shell settings put secure high_text_contrast_enabled 1

Magnification

Set: adb shell settings put secure accessibility_display_magnification_scale 5.0

Enable: adb shell settings put secure accessibility_display_magnification_enabled 1

Disable: adb shell settings put secure accessibility_display_magnification_enabled 0

List Existing Properties

adb shell settings list system
adb shell settings list global
adb shell settings list secure

Also, adb shell getprop is a great way to expose a lot of other properties you can change with the adb shell setprop functionality

Show Touches

adb shell settings put system show_touches 1

Pointer Location

adb shell settings put system pointer_location 1

https://developer.android.com/reference/android/provider/Settings

Hi.....
On my device i have talkback......
It uses this intent to open talkback settings: com.google.android.marvin.talkback/com.google.android.marvin.talkback.TalkBackPreferencesActivity

What i am trying to accomplish is this.....when someone presses settings inside talkback I need my settings (com.android.settings) to crash using these commands:
am crash com.android.settings
am force-stop com.google.android.accessibility.talkback

If you know of a way to redirect this intent, that would solve a major headache......
I can not just turn off the intent because that would remove talkback settings option visibly from my device and that cannot happen.....
Any help please...... Thanks.....

Ps....this is on Android 8.1.....