Turn on or turn off the installation of unknown apps

Code modification method

Android 7.1

In the frameworks/base/packages/SettingsProvider/res/values/defaults.xml file, modify the value of def_install_non_market_apps.

• false : Close
• true : Open

Android10 and above

In Android10, the permanent authorization option of "Allow Unknown Sources" to install applications has been deleted. The switch is no longer found in the system settings. Google will modify the permanent authorization to a separate authorization each time. When the user installs a third party each time The source of the Android software requires manual confirmation of the software permissions.