//Extensions for Jetpack Lifecycle/it.czerwinski.android.lifecycle.livedata

Package it.czerwinski.android.lifecycle.livedata

[androidJvm]

Extensions for Jetpack Lifecycle

Types

Name Summary
ConstantLiveData [androidJvm]
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class ConstantLiveData<T>(value: T) : LiveData<T>
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LiveData that always emits a single constant value.


GroupedLiveData [androidJvm]
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class GroupedLiveData<K, V>(keySelector: (V) -> K) : MediatorLiveData<V>
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MediatorLiveData subclass which provides a separate LiveData per each result returned by keySelector function executed on subsequent values emitted by the source LiveData.


Functions

Name Summary
addDirectSource [androidJvm]
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@MainThread()

inline fun <T> MediatorLiveData<in T>.addDirectSource(source: LiveData<out T>)
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Starts to listen the given source LiveData.


combineLatest [androidJvm]
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fun <T> combineLatest(vararg sources: LiveData<T>): LiveData<List<T
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Returns a LiveData emitting lists of latest values emitted by the given source LiveData.


[androidJvm]
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fun <A, B> combineLatest(first: LiveData<A>, second: LiveData<B>): LiveData<Pair<A?, B
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Returns a LiveData emitting pairs of latest values emitted by the first and the second LiveData.


[androidJvm]
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fun <T, R> combineLatest(vararg sources: LiveData<T>, combineFunction: (List<T?>) -> R): LiveData<R>
More info
Returns a LiveData emitting results of applying the given combineFunction to the latest values emitted by the given source LiveData.


[androidJvm]
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fun <A, B, C> combineLatest(first: LiveData<A>, second: LiveData<B>, third: LiveData<C>): LiveData<Triple<A?, B?, C
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Returns a LiveData emitting triples of latest values emitted by the first, the second and the third LiveData.


[androidJvm]
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fun <A, B, R> combineLatest(first: LiveData<A>, second: LiveData<B>, combineFunction: (A?, B?) -> R): LiveData<R>
More info
Returns a LiveData emitting results of applying the given combineFunction to the latest values emitted by the first and the second LiveData.


[androidJvm]
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fun <A, B, C, R> combineLatest(first: LiveData<A>, second: LiveData<B>, third: LiveData<C>, combineFunction: (A?, B?, C?) -> R): LiveData<R>
More info
Returns a LiveData emitting results of applying the given combineFunction to the latest values emitted by the first, the second and the third LiveData.


defaultIfEmpty [androidJvm]
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fun <T> LiveData<T>.defaultIfEmpty(defaultValue: T): LiveData<T>
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Returns a LiveData that emits the values emitted by this LiveData or a specified default value if this LiveData has not yet emitted any values at the time of observing.


[androidJvm]
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fun <T> LiveData<T>.defaultIfEmpty(defaultValueProducer: () -> T): LiveData<T>
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Returns a LiveData that emits the values emitted by this LiveData or a value returned by defaultValueProducer if this LiveData has not yet emitted any values at the time of observing.


delayStart [androidJvm]
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fun <T> LiveData<T>.delayStart(timeInMillis: Long, context: CoroutineContext = EmptyCoroutineContext): LiveData<T>
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Returns a LiveData emitting values from this LiveData, after dropping values followed by newer values before timeInMillis expires since the result LiveData has been created.


filter [androidJvm]
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fun <T> LiveData<T>.filter(predicate: (T) -> Boolean): LiveData<T>
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Returns a LiveData emitting only values from this LiveData matching the given predicate.


filterIsInstance [androidJvm]
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inline fun <R> LiveData<*>.filterIsInstance(): LiveData<R>
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Returns a LiveData emitting only values of type R from this LiveData.


filterNotNull [androidJvm]
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fun <T> LiveData<T?>.filterNotNull(): LiveData<T>
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Returns a LiveData emitting only non-null values from this LiveData.


groupBy [androidJvm]
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fun <K, V> LiveData<V>.groupBy(keySelector: (V) -> K): GroupedLiveData<K, V>
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Returns a GroupedLiveData providing a set of LiveData, each emitting a different subset of values from this LiveData, based on the result of the given keySelector function.


mapNotNull [androidJvm]
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fun <T, R> LiveData<T>.mapNotNull(transform: (T) -> R?): LiveData<R>
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Returns a LiveData emitting only the non-null results of applying the given transform function to each value emitted by this LiveData.


merge [androidJvm]
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fun <T> merge(vararg sources: LiveData<T>): LiveData<T>
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Returns a LiveData emitting each value emitted by any of the given LiveData.


[androidJvm]
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infix fun <T> LiveData<T>.merge(other: LiveData<T>): LiveData<T>
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Returns a LiveData emitting each value emitted by either this or other LiveData.


reduce [androidJvm]
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fun <T> LiveData<T?>.reduce(operation: (T?, T?) -> T?): LiveData<T?>
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Returns a LiveData emitting accumulated value starting with the first value emitted by this LiveData and applying operation from left to right to current accumulator value and each value emitted by this.


reduceNotNull [androidJvm]
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fun <T> LiveData<T>.reduceNotNull(operation: (T, T) -> T): LiveData<T>
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Returns a LiveData emitting non-null accumulated value starting with the first non-null value emitted by this LiveData and applying operation from left to right to current accumulator value and each subsequent non-null value emitted by this LiveData.


switch [androidJvm]
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fun <T> LiveData<LiveData<T».switch(): LiveData<T>
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Converts LiveData that emits other LiveData into a single LiveData that emits the items emitted by the most recently emitted LiveData.


throttleWithTimeout [androidJvm]
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fun <T> LiveData<T>.throttleWithTimeout(timeInMillis: Long, context: CoroutineContext = EmptyCoroutineContext): LiveData<T>
More info
Returns a LiveData emitting values from this LiveData, after dropping values followed by newer values before timeInMillis expires.