如何對數組/列表進行排序並在android中返回結果？

Question

我正在使用可展開列表視圖來顯示我的應用程序中的文件夾和文件。但是，由於我的應用程序允許用戶添加文件，該列表將混亂起來。所以，我的意圖是將排序列表（名稱）設置爲我的子列表。

我知道有Arrays.sort和Collections.sort，但是這兩種方法都是無效的，而不是返回列表。

那麼我該怎麼做呢？

我的列表：

private File recordImageFolder = new File (Environment.getExternalStorageDirectory(),"/Record/Image"); 
    private File recordSoundFolder = new File (Environment.getExternalStorageDirectory(),"/Record/Sound"); 

    private String[] groups = { "Image", "Sound" }; 
    private String[][] children = { recordImageFolder.list(), recordSoundFolder.list() }; 

Answer 1

相反初始化其聲明中，這些領域的成員，你可以在構造函數或init方法初始化它們，讓您使用Arrays.sort(Object[])：

private File recordImageFolder; 
private File recordSoundFolder; 

private String[] groups; 
private String[][] children; 

public MyClass() { 

    recordImageFolder = new File (Environment.getExternalStorageDirectory(),"/Record/Image"); 
    recordSoundFolder = new File (Environment.getExternalStorageDirectory(),"/Record/Sound"); 

    String[] recordImages = recordImageFolder.list(); 
    String[] recordSounds = recordSoundFolder.list(); 

    Arrays.sort(recordImages); 
    Arrays.sort(recordSounds); 

    groups = new String[] { "Image", "Sound" }; 
    children = new String[][] { recordImages, recordSounds }; 
}