存储目录

公共存储目录

Environment.getExternalStorageDirectory()：                                                                           /storage/emulated/0

Environment.getExternalStoragePublicDirectory("")：                                                               /storage/emulated/0

Environment.getExternalStoragePublicDirectory("test")：                                                         /storage/emulated/0/test

Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)：   /storage/emulated/0/Pictures

注：通过拼接File.separator，可以在外部存储上新建任意文件夹（6.0动态权限WRITE_EXTERNAL_STORAGE）

总结

常量
public static String DIRECTORY_MUSIC = "Music";

public static String DIRECTORY_ALARMS = "Alarms";

public static String DIRECTORY_NOTIFICATIONS = "Notifications";

public static String DIRECTORY_PICTURES = "Pictures";

public static String DIRECTORY_MOVIES = "Movies";

public static String DIRECTORY_DOWNLOADS = "Download";

public static String DIRECTORY_DCIM = "DCIM";

public static String DIRECTORY_DOCUMENTS = "Documents";

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内部存储

根目录          ： /data                                                     Environment.getDataDirectory()

应用目录       ：根目录/xxx/包名（不同设备可能不同）        eg：data/data/包名    或 data/user/0/包名    

应用缓存目录：应用目录/cache                                    Context.getCacheDir()        程序卸载 或 运行空间不足时 会被清理

应用文件目录：应用目录/files                                       Context.getFilesDir()           

                         应用目录/files                                       Context.getFileStreamPath("")

                         应用目录/files/aaa                                Context.getFileStreamPath("aaa")

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外部存储

根目录          ： /storage/emulated/0（不同设备可能不同）Environment.getExternalStorageDirectory()

应用目录       ：根目录/Andorid/data/包名               

应用缓存目录：应用目录/cache                                           Context.getExternalCacheDir()    

应用文件目录：应用目录/files                                              Context.getExternalFilesDir("")     type为空时获取

                         应用目录/files/aaa                                       Context.getExternalFilesDir("aaa")

                         应用目录/files/常量(Music)                          Context.getExternalFilesDir("Environment.DIRECTORY_MUSIC")