The implementation of the implementation principles of Android SUPPORT LIBRARY Collection
ANDROID SUPPORT LIBRARY Collection's implementation principles
In Android development, we often need to use sets to store and operate data.Android provides a very powerful support library, Android Support Library.Among them, the Collections framework provides a series of sets of collection classes, including List, SET, and MAP, so that we can handle data more conveniently.This article will explore the principles of the implementation of Android subpport Library Collections, and give examples to illustrate its usage.
Android support the Library Collections framework is expanded and optimized based on Java's Collections framework.It mainly includes two key categories: ArraySet and ArrayMap.These classes provide APIs similar to the Java native collection, but have improved performance and memory occupation.
First, let's take a look at the implementation principle of ArraySet.ArraySet is an array -based set of sets, which uses two arrays to store keys and value respectively.By using the array instead of a linked list, ArraySet can locate the specified position faster when accessing the set element.In addition, ArraySet also quickly searches elements by using a two -point search algorithm.
The following is a simple example of using ArraySet:
ArraySet<String> set = new ArraySet<>();
set.add("Apple");
set.add("Banana");
set.add("Orange");
for (String item : set) {
Log.d(TAG, item);
}
if (set.contains("Banana")) {
set.remove("Banana");
}
Next, let's take a look at the implementation principle of Arraymap.ArrayMap is a array -based MAP set class, which also uses two arrays to store keys and value.Similarly, ArrayMap also uses an array to improve the efficiency of element access.In addition, ArrayMap also uses a two -point search algorithm to quickly find the key and value.
Below is a simple example code using ArrayMap:
ArrayMap<String, Integer> map = new ArrayMap<>();
map.put("Apple", 5);
map.put("Banana", 3);
map.put("Orange", 8);
for (int i = 0; i < map.size(); i++) {
String key = map.keyAt(i);
int value = map.valueAt(i);
Log.d(TAG, key + ": " + value);
}
if (map.containsKey("Banana")) {
map.remove("Banana");
}
By using Android Support Library Collections framework, we can handle the collection operations more efficiently.It optimizes memory occupation and performance, and provides an API that is easy to use.Whether in the development of Android or in the development of Java, these collection classes can bring us great convenience.
The above is the analysis of the principle of implementation principles of Android Support Library Collection.By understanding the implementation principles of these collection classes, we can better understand their advantages and use scenarios.It is hoped that this article can inspire readers' collection operations in Android development.
