The technical principles of Android SUPPORT LIBRARY Collection and its application in the Java class library
The technical principles of Android SUPPORT LIBRARY Collection
Overview:
Android Support Library Collections (Android support library collection) is a collection framework for the Android platform.It provides a series of collection classes and data structures to help developers handle data sets more easily and achieve common setting operations in applications.This article will explore its technical principles and show some examples of using the framework in the Java library.
Technical principle:
The Android SUPPORT LIBRARY Collections framework is built based on the Java Collection Framework.Java Collection Framework is an important part of the Java standard class library. It provides a set of class and interfaces for storage, operation and retrieval.Android support library collection is expanded on this basis, and additional features and optimizations on the Android platform are provided.
Android Support Library Collections provides some common collection classes, including ArrayList, LinkedList, HashSet, HashMap, etc.These classes are basically packaged in the original Java library, and some additional functions and characteristics are added on the basis of this.
Applications:
Here are some of the application examples of some Android Support Library Collections in the Java class library:
1. ArrayList:
import android.support.v4.util.ArraySet;
ArraySet<String> set = new ArraySet<>();
set.add("Apple");
set.add("Banana");
set.add("Orange");
for (String item : set) {
System.out.println(item);
}
2. LinkedList:
import android.support.v4.util.LinkedHashMultimap;
LinkedHashMultimap<String, String> multimap = new LinkedHashMultimap<>();
multimap.put("Fruits", "Apple");
multimap.put("Fruits", "Banana");
multimap.put("Fruits", "Orange");
multimap.put("Colors", "Red");
multimap.put("Colors", "Blue");
for (String key : multimap.keySet()) {
System.out.println(key + ": " + multimap.get(key));
}
3. HashSet:
import android.support.v4.util.ArraySet;
ArraySet<String> set = new ArraySet<>();
set.add("Apple");
set.add("Banana");
set.add("Orange");
System.out.println("Set size: " + set.size());
set.remove("Banana");
System.out.println("Set contains 'Banana': " + set.contains("Banana"));
set.clear();
System.out.println("Set size after clear: " + set.size());
4. HashMap:
import android.support.v4.util.SimpleArrayMap;
SimpleArrayMap<String, Integer> map = new SimpleArrayMap<>();
map.put("Apple", 10);
map.put("Banana", 20);
map.put("Orange", 15);
System.out.println("Map size: " + map.size());
int quantity = map.get("Banana");
System.out.println("Quantity of 'Banana': " + quantity);
map.remove("Orange");
System.out.println("Map contains 'Orange': " + map.containsKey("Orange"));
map.clear();
System.out.println("Map size after clear: " + map.size());
Summarize:
Android Support Library Collection's framework is based on the Java Collection Framework, providing a series of convenient collection and data structures for developers on the Android platform.Through this framework, developers can easily handle data sets and implement common set operations.When developing Android applications, using Android Support Library Collections can greatly improve development efficiency and code quality.
