livedata-ext
Android LiveData extension, including FreshLiveData and etc.
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repositories {
jcenter()
}
dependencies {
implementation 'com.github.kxfeng:livedata-ext:1.0.0'
}Usage
FreshLiveData
Extension functions to observe freshly, which means the observer will only receive new value after now, previous value won't dispatch to it.
- Kotlin usage
val liveData = MutableLiveData<String>()
liveData.observeFreshly(lifecycleOwner, Observer {
println("Fresh value: $it")
})
val observer = Observer<String> {
println("Fresh value: $it")
}
liveData.observeForeverFreshly(observer)
liveData.removeObserverFreshly(observer)- Simple test case
val liveData = MutableLiveData<String>()
liveData.value = "Hello"
val freshResult = mutableListOf<String>()
val normalResult = mutableListOf<String>()
liveData.observeForeverFreshly(Observer {
freshResult.add(it)
})
liveData.observeForever(Observer {
normalResult.add(it)
})
liveData.value = "World"
assertEquals(listOf("World"), freshResult)
assertEquals(listOf("Hello", "World"), normalResult)- Java usage
LiveData<String> liveData = new MutableLiveData<>();
FreshLiveDataKt.observeForeverFreshly(liveData, msg -> {
System.out.println("Fresh value: " + msg);
});License
Copyright 2019 kxfeng
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.