Android Support Library Collection's technical principles in the Java library
Android Support Library Collection's technical principles in the Java library
The Collections framework in Android Support Library provides developers with a series of powerful data structures and algorithms that can efficiently process collection data in Android applications.This article will introduce the technical principles of Android Support Library Collections framework in the Java library, and provide some Java code examples to help readers better understand their usage and implementation.
The Android Support Library Collection's framework mainly includes the following core categories: ArraySet, ArrayMap, LongSparsearray, and SparseintaRray.The principles of these classes will be introduced in detail below.
1. ArraySet: ArraySet is a collection class based on array, and its underlying data structure is an array.It uses dual -point search to achieve fast insertion, delete and search operations.The elements in ArraySet are unique and orderly.
The following is an example code of ArraySet:
ArraySet<String> arraySet = new ArraySet<>();
arraySet.add("apple");
arraySet.add("banana");
arraySet.add("orange");
for (String fruit : arraySet) {
System.out.println(fruit);
}
2. ArrayMap: ArrayMap is a key value -based data structure based on array -based implementation. Its underlying data structure is two array, one for storage key, and the other for storage value.ArrayMap also uses two -point search and some other optimized algorithms to improve performance.
The following is an example code of ArrayMap:
ArrayMap<String, Integer> arrayMap = new ArrayMap<>();
arrayMap.put("apple", 1);
arrayMap.put("banana", 2);
arrayMap.put("orange", 3);
for (int i = 0; i < arrayMap.size(); i++) {
String key = arrayMap.keyAt(i);
Integer value = arrayMap.valueAt(i);
System.out.println(key + ": " + value);
}
3. LongSparsearray: LongSparsearray is a sparse and sparse group based on array. Its key is long and integrated, and the value can be arbitrary type.LongSparsearray uses dual -point search to achieve fast insertion, delete, and finding operations.Compared to ArrayMap, LongSparsearray is more suitable for a large key value range.
Here are a sample code for LongSparsearray:
LongSparseArray<String> longSparseArray = new LongSparseArray<>();
longSparseArray.put(1L, "apple");
longSparseArray.put(2L, "banana");
longSparseArray.put(3L, "orange");
for (int i = 0; i < longSparseArray.size(); i++) {
long key = longSparseArray.keyAt(i);
String value = longSparseArray.valueAt(i);
System.out.println(key + ": " + value);
}
4. Sparseintarray: Sparseintarray is a sparse array based on array -based implementation. Its keys and values are integer.Sparseintarray uses two -point search to achieve fast insertion, delete and finding operations.Compared to ArrayMap, Sparseintarray is more efficient when processing integer data.
The following is an example code for Sparseintarray:
SparseIntArray sparseIntArray = new SparseIntArray();
sparseIntArray.put(1, 10);
sparseIntArray.put(2, 20);
sparseIntArray.put(3, 30);
for (int i = 0; i < sparseIntArray.size(); i++) {
int key = sparseIntArray.keyAt(i);
int value = sparseIntArray.valueAt(i);
System.out.println(key + ": " + value);
}
Summarize:
Android support the Library Collection frame provides efficient collection processing functions by using array -based data structure and optimization algorithms.Developers can choose the applicable data structure according to the needs of the application and use simple API for operation.It is hoped that the example code provided in this article can help readers better understand the method and implementation principles of Android Support Library Collections.
