注意：由于Android6.0+支持多用户，所以，在4.1.2 返回路径 /data/data/com.xxx.xxx/

请自动看做 6.0 下的/data/user/0/com.xxx.xxx/目录

每次都记不住Android中获取的文件路径具体是哪个，整理了一下常用的路径获取方式。以下代码运行在Activity的onCreate方法中，假设当前项目的包名为me.febsky.debug，记得请求读写sd卡权限，6.0要动态获取

String[] permissions = {"android.permission.WRITE_EXTERNAL_STORAGE"};

ActivityCompat.requestPermissions(this, permissions, 1); // without sdk version check

AndroidManifest.xml中添加如下代码

测试代码

//Environment.getDataDirectory()--->/data

Log.d("Q_M", "Environment.getDataDirectory()--->" + Environment.getDataDirectory());

//Environment.getDownloadCacheDirectory()--->/cache

Log.d("Q_M", "Environment.getDownloadCacheDirectory()--->" + Environment.getDownloadCacheDirectory());

//Environment.getExternalStorageDirectory()--->/storage/emulated/0

Log.d("Q_M", "Environment.getExternalStorageDirectory()--->" + Environment.getExternalStorageDirectory());

// Environment.getExternalStoragePublicDirectory--->/storage/emulated/0/Music

Log.d("Q_M", "Environment.getExternalStoragePublicDirectory--->" + Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC));

//Environment.getRootDirectory()--->/system

Log.d("Q_M", "Environment.getRootDirectory()--->" + Environment.getRootDirectory());

//getApplication().getExternalCacheDir()--->/storage/emulated/0/Android/data/me.febsky.debug/cache

Log.d("Q_M", "getApplication().getExternalCacheDir()--->" + getApplication().getExternalCacheDir());

//getApplication().getExternalFilesDir--->/storage/emulated/0/Android/data/me.febsky.debug/files/Music

Log.d("Q_M", "getApplication().getExternalFilesDir--->" + getApplication().getExternalFilesDir(android.os.Environment.DIRECTORY_MUSIC));

//getApplication().getCacheDir()--->/data/data/me.febsky.debug/cache

Log.d("Q_M", "getApplication().getCacheDir()--->" + getApplication().getCacheDir());

//getApplication().getFilesDir()--->/data/data/me.febsky.debug/files

Log.d("Q_M", "getApplication().getFilesDir()--->" + getApplication().getFilesDir());

//下面这个方法受限于api 24

//Log.d("Q_M", " getApplication().getDataDir()--->" + getApplication().getDataDir());

//getApplication().getFileStreamPath--->/data/data/me.febsky.debug/files/yourfile

Log.d("Q_M", "getApplication().getFileStreamPath--->" + getApplication().getFileStreamPath("yourfile"));

//getApplication().getObbDir()--->/storage/emulated/0/Android/obb/me.febsky.debug

Log.d("Q_M", "getApplication().getObbDir()--->" + getApplication().getObbDir());

//getApplicationInfo().dataDir--->/data/data/me.febsky.debug

Log.d("Q_M", "getApplicationInfo().dataDir--->" + getApplicationInfo().dataDir);

//getApplicationInfo().publicSourceDir--->/data/app/me.febsky.debug-1/base.apk

Log.d("Q_M", "getApplicationInfo().publicSourceDir--->" + getApplicationInfo().publicSourceDir);

//getApplicationInfo().sourceDir--->/data/app/me.febsky.debug-1/base.apk

Log.d("Q_M", "getApplicationInfo().sourceDir--->" + getApplicationInfo().sourceDir);

///data/data/me.febsky.debug/app_yourfile 执行这行代码会 创建名为app_yourfile 的文件夹

Log.d("Q_M", "getBaseContext().getDir--->" + getBaseContext().getDir("yourfile", MODE_PRIVATE));

//下面省略和getApplication 中相同的方法，Application也是间接继承自Context类

路径的规律图如下

一般地，通过Context 和 Environment相关的方法获取文件存取的路径。

通过这两个类可获取各种路径，如图：

+- /data ---> Environment.getDataDirectory()

| |

| |

| +- data/com.adorkable.sample

| |

| |

| +- files ---> context.getFilesDir()

| | |

| | +- file1 ---> context.getFileStreamPath("file1")

| | |

| | +- file2 --->context.openFileOutput("file2")

| |

| +- cache ---> context.getCacheDir()

| |

| +- app_$name ---> context.getDir(String name, int mode)

| |

| +- shared_prefs ---> context.getSharedPreferences()

|

|

+- /storage/sdcard0 ---> Environment.getExternalStorageDirectory()

|

|- Music --->Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC)

|

+- dir1 --->Environment.getExternalStoragePublicDirectory("dir1")

|

+- Andorid/data/com.adorkable.sample【注：这里是包名】

|

|

+- files ---> context.getExternalFilesDir("")

| |

| +- file1 ---> context.getExternalFilesDir("file1")

| |

| +- Music ---> context.getExternalFilesDir(Environment.Music)

| |

| +- Picture ---> context.getExternalFilesDir(Environment.Picture)

| |

| +- ...

|

|

+- cache --->context.getExternalCacheDir()

|

+- 其他

```

【参考】

[http://febsky.me](http://febsky.me/2015/07/14/2015-07-14-Android%20%E6%96%87%E4%BB%B6%E5%AD%98%E5%82%A8/)