// 获得缓存文件路径，磁盘空间不足或清除缓存时数据会被删掉，一般存放一些临时文件  
// /data/data/<application package>/cache目录  
File cacheDir = getCacheDir();  
Log.d("TAG", "getCacheDir() : " + cacheDir.getAbsolutePath());  
  
// 获得文件存放路径，一般存放一些需要长期保留的文件  
// /data/data/<application package>/files目录  
File fileDir = getFilesDir();  
Log.d("TAG", "getFilesDir() : " + fileDir.getAbsolutePath());  
  
// 这是一个可以存放你自己应用程序自定义的文件，你可以通过该方法返回的File实例来创建或者访问这个目录  
// /data/data/<application package>/  
File dir = getDir("fileName", MODE_PRIVATE);  
Log.d("TAG", "getDir() : " + dir.getAbsolutePath());  
  
// 获取应用程序外部存储的缓存目录路径  
// SDCard/Android/data/<application package>/cache目录  
File externalCacheDir = getExternalCacheDir();  
Log.d("TAG", "getExternalCacheDir() : " + externalCacheDir.getAbsolutePath());  
  
// 获取应用程序外部存储的某一类型的文件目录，  
// SDCard/Android/data/<application package>/files目录  
// 这里的类型有  
// Environment.DIRECTORY_MUSIC音乐  
// Environment.DIRECTORY_PODCASTS 音频  
// Environment.DIRECTORY_RINGTONES 铃声  
// Environment.DIRECTORY_ALARMS 闹铃  
// Environment.DIRECTORY_NOTIFICATIONS 通知铃声  
// Environment.DIRECTORY_PICTURES 图片  
// Environment.DIRECTORY_MOVIES 视频  
File externalFilesDir = getExternalFilesDir(Environment.DIRECTORY_MUSIC);  
Log.d("TAG", "getExternalFilesDir() : " + externalFilesDir.getAbsolutePath());  
  
// 获取应用的外部存储的缓存目录  
File[] externalCacheDirs = getExternalCacheDirs();  
for (int i = 0; i < externalCacheDirs.length; i++) {  
    Log.d("TAG", "getExternalCacheDirs() " + i + " : " + externalCacheDirs[i].getAbsolutePath());  
}  
  
// 获取应用的外部存储的某一类型的文件目录  
File[] externalFilesDirs = getExternalFilesDirs(Environment.DIRECTORY_MUSIC);  
for (int i = 0; i < externalFilesDirs.length; i++) {  
    Log.d("TAG", "getExternalFilesDirs() " + i + " : " + externalFilesDirs[i].getAbsolutePath());  
}  
  
// 获取应用的外部媒体文件目录  
File[] externalMediaDirs = getExternalMediaDirs();  
for (int i = 0; i < externalMediaDirs.length; i++) {  
    Log.d("TAG", "getExternalMediaDirs() " + i + " : " + externalMediaDirs[i].getAbsolutePath());  
}  
  
// 获得应用程序指定数据库的绝对路径  
// /data/data/<application package>/database/database.db目录  
File databasePath = getDatabasePath("database.db");  
Log.d("TAG", "getDatabasePath() : " + databasePath.getAbsolutePath());  
  
  
// -------------分界线-----------------------  
// 以下是一些共有的目录，与APP包名无关，不会随APP卸载被删除  
// /data目录  
File dataDirectory = Environment.getDataDirectory();  
Log.d("TAG", "Environment.getDataDirectory() : " + dataDirectory.getAbsolutePath());  
// /cache目录  
File downloadCacheDirectory = Environment.getDownloadCacheDirectory();  
Log.d("TAG", "Environment.getDownloadCacheDirectory() : " + downloadCacheDirectory.getAbsolutePath());  
// /sdcard目录  
File externalStorageDirectory = Environment.getExternalStorageDirectory();  
Log.d("TAG", "Environment.getExternalStorageDirectory() : " + externalStorageDirectory.getAbsolutePath());  
// /sdcard/Pictures目录  
File externalStoragePublicDirectory = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);  
Log.d("TAG", "Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) : " + externalStoragePublicDirectory.getAbsolutePath());  
// /system目录  
File rootDirectory = Environment.getRootDirectory();  
Log.d("TAG", "Environment.getRootDirectory()() : " + rootDirectory.getAbsolutePath());