如何在Android Wear应用程序的FragmentActivity中启用环境模式（始终打开）？

Question

I have an android wear app that contains a FragmentActivity:

public class MyFragmentActivity extends FragmentActivity

With 2 Fragments:

public class MyFirstFragment extends Fragment

and

public class MySecondFragment extends Fragment

I want to enable the ambient mode (always on) in this fragment activity. However, according to the documentation , the ambient mode is only available if i extend WearableActivity .

Is there a way to have both properties of the FragmentActivity & WearableActivity together in one?

or

Is there another way to enable the ambient mode in the FragmentActivity ?

Answer 1

You should implement AmbientModeSupport.AmbientCallbackProvider instead of WearableActivity , then you can extend FragmentActivity instead.

It is the new preferred method and it still gives you all the goodies you got with WearableActivity but also lets you use Activity (or any sub classes... FragementActivity, etc.).

Official docs call out the details (and example code) .

Update: Use AmbientModeSupport now instead of AmbientMode . Google recently changed the name, so the old version is deprecated.

Answer 2

Answer to both questions is no , sorry.

Ambient mode is enabled by calling WearableActivity.setUseAmbient() , which obviously is not available if you're not extending WearableActivity . And since Java doesn't support multiple inheritance, you can't subclass both WearableActivity and FragmentActivity at the same time - it's one or the other.

Do you really need to be using Fragments on a watch activity? If you really want to support ambient mode, you probably need to look at moving your UI out of fragments.

Answer 3

If you want to use Fragments on Android Wear and support Ambient mode, you need to use the AmbientModeSupport class.

Make your activity extend FragmentActivity and implement AmbientModeSupport.AmbientCallbackProvider and you're all set!

Details and examples are here: https://developer.android.com/training/wearables/apps/always-on#ambient-mode-class