Programmatically find whether installing from unknown sources is allowed

Question

I need to find whether the current Android device allows to install apps from sources other than the market. This option appears in the settings UI under Applications named

Answer 1

Here is the code that uses the mentioned setting:

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

Also showing the setting to user might me useful:

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