how to use toUppercase(locale) in android 4.2?

Question

Im using android 4.2 SDK, I have been getting a warning on this line of code:

String text0 = tagalogText.getText().toString();
String textA = text0.substring(0, 1).toUpperCase() + text0.substring(1).toLowerCase();

When I hover over it, it says:

Implicitly using the default locale is a common source of bugs: Use toUpperCase(Locale) instead.

and

Implicitly using the default locale is a common source of bugs: Use toLowerCase(Locale) instead.

I copy the code from Java, not in Java for android. Does anyone know how to remove this error? And why is it now a preferred way to use this method?

Answer 1

Just need to clean project.

I had same trouble. I wasn't relying on the default locale, and explicitly tried Locale.US, and Locale.English, yet still got the yellow lint warning. Went away after cleaning.

string.toLowerCase(Locale.ENGLISH);

Answer 2

It's a lint warning, not an error. The reason is that the default locale should be used for user-facing data - if you're rendering something that the user may prefer to see in a style/format specific to their locality.

You need to decide whether it's appropriate to use the default locale:

• if this is a string that will be used behind the scenes and your architecture expects this string to be uniform across all devices across the world, then you should specify a locale explicitly - usually Locale.US

• if it's a user-facing string or your architecture doesn't care if it's different on other devices (i.e. it's only used internally, and isn't expected to be in a particular format other than the specified case), then you can safely ignore the lint warning.

Answer 3

This is how I solved it:

string.toUpperCase(getResources().getConfiguration().locale));