GargoyleLizy
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| class MapFragment : Fragment(), OnMapReadyCallback { | |
| companion object { | |
| private const val MAP_VIEW_BUNDLE_KEY = "mapview_bundle_key" | |
| } | |
| private var _binding: FragmentMapsBinding? = null | |
| private val binding: FragmentMapsBinding get() = _binding!! | |
| private var hasMapConfigured: Boolean = false |
GargoyleLizy
/ listFileName.py
Created
March 31, 2019 07:20
List the file names in curent directory.
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| import os | |
| def listFileName(directoryName): | |
| scandir_iterator = os.scandir(directoryName) | |
| for item in scandir_iterator: | |
| if os.path.isfile(item.path): | |
| print(item.name) | |
| if __name__ == "__main__": |
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| /** | |
| * With Given LiveData, produce a new LiveData, which will filter given one's emitted item with | |
| * supplied predicate. | |
| */ | |
| fun <T> LiveData<T>.filter(predicate: (T) -> Boolean): LiveData<T> { | |
| val filtered = MediatorLiveData<T>() | |
| filtered.addSource(this) { | |
| if (predicate(it)) { | |
| filtered.value = it | |
| } |
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| /** | |
| * With Given LiveData, produce a new LiveData, which will filter given one's emitted item with | |
| * supplied predicate. | |
| */ | |
| fun <T> LiveData<T>.filter(predicate: (T) -> Boolean): LiveData<T> { | |
| val filtered = MediatorLiveData<T>() | |
| filtered.addSource(this) { | |
| if (predicate(it)) { | |
| filtered.value = it | |
| } |
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| /** | |
| * Monitor the LiveData and when an emitted item satisfies predicate. Trigger an action, execute | |
| * the statements supplied. Then stop monitoring the LiveData. | |
| */ | |
| fun <T> LiveData<T>.doOnce(predicate: (T) -> Boolean, action: () -> Unit): LiveData<T> { | |
| val liveData: LiveData<T> = this | |
| val observer = object : Observer<T> { | |
| override fun onChanged(t: T) { | |
| if (predicate(t)) { | |
| action() |
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| /** | |
| * Monitor the LiveData and when an emitted item satisfies predicate. Trigger an action, | |
| * execute the statements supplied. | |
| */ | |
| fun <T> LiveData<T>.doWhen(predicate: (T) -> Boolean, action: () -> Unit): LiveData<T> { | |
| this.observeForever { | |
| if (predicate(it)) { | |
| action() | |
| } | |
| } |
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| /** | |
| * When an item is emitted by either of two LiveData, combine the latest item emitted by each | |
| * LiveData via a specified function and emit items based on the result of this function. | |
| */ | |
| @Suppress("UNCHECKED_CAST") | |
| fun <Y, T1, T2> LiveData<T1>.combineLatest(another: LiveData<T2>, | |
| combiner: (T1, T2) -> Y): LiveData<Y> { | |
| val mediatorLiveData = MediatorLiveData<Y>() | |
| var latestT1: T1? = null |
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| private val mediatorData = MediatorLiveData<List<Item>>().apply { | |
| this.addSource(itemListLiveData) { itemList -> | |
| val apiResponse = apiLiveData.value | |
| if (apiResponse != null) { | |
| this.value = combineItemListAndApi(itemList, apiResponse) | |
| } | |
| } | |
| this.addSource(apiLiveData) { apiResponse -> | |
| val itemList = itemListLiveData.value | |
| if (itemList != null) { |
GargoyleLizy
/ BigInteger.kt
Created
February 19, 2019 04:23
A class to solve "+/-" with big integer values.
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| class BigInteger private constructor(private val valueArray: CharArray, | |
| private val isPositive: Boolean) { | |
| constructor(strValue: String) : this(strValue.toProperCharArray(), | |
| strValue.isPositive()) | |
| fun getValueArray(): CharArray { | |
| return this.valueArray.copyOf() | |
| } |
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| /** | |
| * Counting Sort assumes every element of input array was inside [0,k] | |
| */ | |
| object CountingSort { | |
| fun sort(input: Array<Int>, upperLimit: Int): Array<Int> { | |
| val C = IntArray(upperLimit + 1) { 0 } | |
| val output = Array<Int>(input.size) { 0 } | |
| input.forEach { element -> | |
| C[element]++ |
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