Millised kogumite rakendused on Java jaoks Androidis?

In Android, standard implementations from the Java Collections Framework are available for working with collections, as well as specialized classes optimized for mobile devices with limited resources.

Main collection implementations:

• ArrayList — dynamic array, good for quick access by index.
• LinkedList — doubly linked list, efficient for frequent insertions and deletions.
• HashMap — hash table for storing key-value pairs with fast access.
• SparseArray — specialized implementation for storing pairs with int key and object, more memory-efficient than HashMap<Integer, Object>, especially with few elements.
• SparseBooleanArray, SparseIntArray, SparseLongArray — analogs of SparseArray for primitive types, save memory.

Using SparseArray and its variants is recommended in Android, as they reduce garbage collector load and save memory compared to regular HashMaps, especially when working with primitive keys.

Example of using SparseArray:

SparseArray<String> sparseArray = new SparseArray<>();
sparseArray.put(1, "One");
sparseArray.put(2, "Two");
String value = sparseArray.get(1); // "One"

Therefore, the choice of collection depends on the task and requirements for performance and memory.