各種獲取文件路徑：
=getDir
/data/data/com.auto/app_hehe
=getCacheDir
/data/data/com.auto/cache
=getFilesDir
/data/data/com.auto/files
=getObbDir
/storage/emulated/0/Android/obb/com.auto
=getCacheDir
/data/data/com.auto/files
=getExternalCacheDir
/storage/emulated/0/Android/data/com.auto/cache
=getExternalFilesDir
/storage/emulated/0/Android/data/com.auto/files/nihao
=Environment.getDataDirectory
/data
=Environment.getDownloadCacheDirectory
/cache
=Environment.getExternalStorageDirectory
/storage/emulated/0
=Environment.getRootDirectory
/system