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Updated AndroidX

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M66B
2019-10-23 20:59:13 +02:00
parent 21488514ed
commit 2e8f6ebbd0
3 changed files with 41 additions and 8 deletions
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33
app/src/main/java/androidx/lifecycle/Transformations.java
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@@ -65,6 +65,7 @@ public class Transformations {
* {@code mapFunction} to each value set.
*/
@MainThread
@NonNull
public static <X, Y> LiveData<Y> map(
@NonNull LiveData<X> source,
@NonNull final Function<X, Y> mapFunction) {
@@ -129,6 +130,7 @@ public class Transformations {
* value set
*/
@MainThread
@NonNull
public static <X, Y> LiveData<Y> switchMap(
@NonNull LiveData<X> source,
@NonNull final Function<X, LiveData<Y>> switchMapFunction) {
@@ -158,4 +160,35 @@ public class Transformations {
});
return result;
}
/**
* Creates a new {@link LiveData} object that does not emit a value until the source LiveData
* value has been changed. The value is considered changed if {@code equals()} yields
* {@code false}.
*
* @param source the input {@link LiveData}
* @param <X> the generic type parameter of {@code source}
* @return a new {@link LiveData} of type {@code X}
*/
@MainThread
@NonNull
public static <X> LiveData<X> distinctUntilChanged(@NonNull LiveData<X> source) {
final MediatorLiveData<X> outputLiveData = new MediatorLiveData<>();
outputLiveData.addSource(source, new Observer<X>() {
boolean mFirstTime = true;
@Override
public void onChanged(X currentValue) {
final X previousValue = outputLiveData.getValue();
if (mFirstTime
|| (previousValue == null && currentValue != null)
|| (previousValue != null && !previousValue.equals(currentValue))) {
mFirstTime = false;
outputLiveData.setValue(currentValue);
}
}
});
return outputLiveData;
}
}