android - 如何在 Android 中对 List<Size> 进行排序

Question

我有一个 List<Size> list1来自 parameters.getSupportedPreviewSizes() 我想按升序排序(width * height) .
我试过Collection.sort , 但似乎不起作用。
排序列表的最佳方法是什么？谢谢。

Answer 1

使用自定义 Comparator .

A Comparator is used to compare two objects to determine their ordering with respect to each other. On a given Collection, a Comparator can be used to obtain a sorted Collection which is totally ordered.

final Camera camera = ...;
final List<Camera.Size> sizes = camera.getParameters().getSupportedPreviewSizes();
Collections.sort(sizes, new Comparator<Camera.Size>() {

  public int compare(final Camera.Size a, final Camera.Size b) {
    return a.width * a.height - b.width * b.height;
  }
});