Locale gets reverted to device's default, after some time in the background (target 25)

[dor506]

Hi

We just updated our app configuration to target and compile against api 25.

The app is using multiple languages, so we set the locale in the configuration according to user selection.

We have a base activity that implements the context wrapping:

@Override
protected void attachBaseContext(Context newBase)
{
    super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
}

We found the following problem:

1. We run the application when the device locale is en_US. (in this stage the application locale is en_US)
2. We update the configuration (locale) of the app in the application onCreate method:
   Locale locale = new Locale("iw"); // hebrew for example
   Locale.setDefault(locale);
   android.content.res.Configuration config = new android.content.res.Configuration();
   config.locale = locale;
   getBaseContext().getResources().updateConfiguration(config,
   getBaseContext().getResources().getDisplayMetrics());

(in this stage the application locale is iw_IL)
3. We go to the background, and after some time, when going to foreground, we discover that the application locale is reverted back to en_US.

** We didn't find the exact cause for this issue, But A quick way to reproduce this is while in background, to rotate the device to landscape and then to portrait, and then go back to our application. it happens immediately.

If you need more details, we'd love to supply.

Thanks in advance!