CODEWITHSUNDEEP
androidandroid-room
portfoliobuilder
portfoliobuilder

Reputation: 7866

required: 'android.arch.lifecycle.LifecycleOwner error

I want to create a utility class that will manage my Room database. Using live data, I am able to observe changes within my database, however, I can only place this observer in my Activity class. I want to confirm that this is really the case. I have tried to use both a context and Activity as a perimeter.

I have also added the following library to gradle

implementation "android.arch.lifecycle:extensions:1.1.1"

Here is an example of how I use the observer

   public DatabaseUtils(AppDatabase db,  Context context) {
        db.testDao().getAllLiveList().observe(
                context, new Observer<List<TestEntity>>() {
                    @Override
                    public void onChanged(@Nullable List<TestEntity> testEntities) {
                       // do work

                    }
                });

    }

This works fine in an Activity, but moved to a class that does not extend Activity I am receiving the error :

Wrong 1st argument. Found....required: 'android.arch.lifecycle.LifecycleOwner error

Upvotes: 1

Views: 2820

Answers (1)

Aaron
Aaron

Reputation: 3894

That's because LiveData.observe takes LifecycleOwner as its first argument and not a Context, and an activity is also a LifecycleOwner:

public class SupportActivity extends Activity implements LifecycleOwner {
    // Your activity may be a subclass of this activity.
}

So you probably want to pass a LifecycleOwner instead of a Context to your DatabaseUtil. Or you can use LiveData.observeForever if you do not care about the lifecycle.

Upvotes: 6

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