android-livedata

I have a repository which holds the LiveData object and is used by both activity and a foreground service through a ViewModel. When I start observing from the activity everything works as expected. However observing from the service doesn't trigger the Observe. This is the code I use class MyService: LifecycleService() { lateinit var viewModel: PlayerServiceViewModel override fun onCreate() { viewModel = MyViewModel(applicationContext as Application) } override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int { viewModel.getLiveData().observe(this, Observer { data -> // Do

It looks like MutableLiveData differs from LiveData only by making the setValue() and postValue() methods public, whereas in LiveData they are protected. What are some reasons to make a separate class for this change and not simply define those methods as public in the LiveData itself? Generally speaking, is such a form of inheritance (increasing the visibility of certain methods being the only change) a well-known practice and what are some scenarios where it may be useful (assuming we have access to all the code)? In LiveData - Android Developer Documentation , you can see that for LiveData

Is it possible to prevent LiveData receive the last value when start observing? I am considering to use LiveData as events. For example events like show message, a navigation event or a dialog trigger, similar to EventBus. I found something similar SingleLiveEvent - but it work only for 1 observer and not for multiple observers. I created a new Class that will hold my real data and a "special ID": class LiveDataItem { long mRealtimeNanos; YOUR_PREVIOUS_LIVEDATA_TYPE mData; LiveDataItem(YOUR_PREVIOUS_LIVEDATA_TYPE data, long realtimeNanos) { this.mRealtimeNanos = realtimeNanos; this.mData =

When I press the play button in Android Studio, my app compiles but is shows this error (redacted): Error:Program type already present: android.arch.lifecycle.LiveData (Full log) I've tried deleting the .gradle folder, then going to Build > Clean Project and Build > Rebuild Project . However, it doesn't work. I've also tried deleting the source code, then cloning again from git and importing the folder to Android Studio. However, it still produces that error. Here's my app's app/build.gradle : apply plugin: 'com.android.application' android { compileSdkVersion 27 buildToolsVersion '27.0.3'

Java POJO Object public class Section { @ColumnInfo(name="section_id") public int mSectionId; @ColumnInfo(name="section_name") public String mSectionName; public int getSectionId() { return mSectionId; } public void setSectionId(int mSectionId) { this.mSectionId = mSectionId; } public String getSectionName() { return mSectionName; } public void setSectionName(String mSectionName) { this.mSectionName = mSectionName; } } My Query method @Query("SELECT * FROM section") LiveData<List<Section>> getAllSections(); Accessing DB final LiveData<List<Section>> sections = mDb.sectionDAO().getAllSections()

I am trying to find out in the code below, why is it that Room's LiveData observable does not give me new shifts once I populate the database with new data. This is put on my activity's onCreate method: shiftsViewModel = ViewModelProviders.of(this).get(ShiftsViewModel.class); shiftsViewModel .getShifts() .observe(this, this::populateAdapter); This is the populateAdapter method: private void populateAdapter(@NonNull final List<Shift> shifts){ recyclerView.setAdapter(new SimpleItemRecyclerViewAdapter(shifts)); } I also have the following code that populates the database (I use RxJava to do the