Is there a way to check if “Install from unknown source” is enabled on Android?

Question

I want to prompt the user if this option is not enabled.

Answer 1

Here is another way to check this setting:

boolean isNonPlayAppAllowed = Settings.Secure.getInt(getContentResolver(), Settings.Secure.INSTALL_NON_MARKET_APPS) == 1;

Also this code to show the setting to user might me useful:

if (!isNonPlayAppAllowed) {
    startActivity(new Intent(android.provider.Settings.ACTION_SECURITY_SETTINGS));
}