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

Uri settingsUri = Settings.Secure.CONTENT_URI;
String[] projection = new String[]{Settings.System.VALUE};
String selection = Settings.Secure.NAME + " = ? AND " +
        Settings.Secure.VALUE + " = ?";
String[] selectionArgs = {Settings.Secure.INSTALL_NON_MARKET_APPS,
    String.valueOf(1)};
Cursor query = getContentResolver().query(settingsUri, projection,
    selection, selectionArgs, null);
if (query.getCount() == 1) {
    // it's enabled
} else {
    // it's not
}