barbeau

Constellation	Prefix
GPS	001
SBAS	010
GLONASS	011
QZSS	100
Beidou	101
Galileo	110
IRNSS	111

barbeau

Message type	Int	Binary
TYPE_BDS_CNAV1	1283	00000000 00000000 00000101 00000011
TYPE_BDS_CNAV2	1284	00000000 00000000 00000101 00000100
TYPE_BDS_D1	1281	00000000 00000000 00000101 00000001
TYPE_BDS_D2	1282	00000000 00000000 00000101 00000010
TYPE_GAL_F	1538	00000000 00000000 00000110 00000010
TYPE_GAL_I	1537	00000000 00000000 00000110 00000001
TYPE_GLO_L1CA	769	00000000 00000000 00000011 00000001
TYPE_GPS_CNAV2	260	00000000 00000000 00000001 00000100

barbeau

...
// New plugins for Room
apply plugin: 'kotlin-kapt'
apply plugin: 'dagger.hilt.android.plugin'

android {
    ...
    defaultConfig {
        ...

barbeau

buildscript {

    ...
    ext.hilt_version = '2.35'
    
    dependencies {
          // Hilt for dependency injection
          classpath "com.google.dagger:hilt-android-gradle-plugin:$hilt_version"
          ...
    }    

barbeau

@AndroidEntryPoint
class ForegroundOnlyLocationService : LifecycleService() {
  ...  
  
  // Data store (in this case, Room database) where the service will persist the location data, injected via Hilt
  @Inject
  lateinit var repository: LocationRepository
  
  override fun onCreate() {
    ...

barbeau

@AndroidEntryPoint
class MainActivity : AppCompatActivity(), SharedPreferences.OnSharedPreferenceChangeListener {
  ...
    
  // Repository (in this case, Room database) from which to receive location updates via Flow, injected via Hilt
  @Inject
  lateinit var repository: LocationRepository  
  
  override fun onCreate(savedInstanceState: Bundle?) {
    ...

barbeau

@Module
@InstallIn(SingletonComponent::class)
object DataModule {

    @Provides
    @Singleton
    fun provideDatabase(@ApplicationContext context: Context): LocationDatabase =
            LocationDatabase.create(context)

    @Provides

barbeau

// Required for Hilt dependency injection
@HiltAndroidApp
class LocationApplication : Application()

barbeau

class LocationRepository @Inject constructor(
        private val locationDao: LocationDao
) {

    fun getLocations() = locationDao.getLocations()

    // By default Room runs suspend queries off the main thread, therefore, we don't need to
    // implement anything else to ensure we're not doing long running database work
    // off the main thread.
    @Suppress("RedundantSuspendModifier")

barbeau

@Dao
interface LocationDao {

    @Transaction
    suspend fun updateLocation(location: Location) {
        location.let {
            deleteLocations() // This deletes previous locations to keep the database small. If you want to store a full location history, remove this line.
            insertLocation(it)
        }
    }