作者：天生笑丷丶话 | 来源：互联网 | 2023-10-12 10:08
在Android平台上使用：$cordovaFileTransfer进行文件下载时提示：cordova.file.documentsDirectoryisnull，查了以下文档参照
在Android平台上使用：$cordovaFileTransfer进行文件下载时提示：cordova.file.documentsDirectory is null，查了以下文档参照：http://ngcordova.com/docs/plugins/file/，
documentsDirectory是IOS平台的用法，在Android平台上没有此方法所以获取到null,解决方法：
通过使用：$cordovaDevice.getPlatform()获取应用平台，针对不同平台进行文件下载处理：
IOS使用:cordova.file.documentsDirectory
Android使用:cordova.file.externalRootDirectory
iOS File System Layout
| Device Path | cordova.file.* | iosExtraFileSystems | r/w? | persistent? | OS clears | sync | private |
|---|
/var/mobile/Applications// |
applicationStorageDirectory |
- |
r |
N/A |
N/A |
N/A |
Yes |
appname.app/ |
applicationDirectory |
bundle |
r |
N/A |
N/A |
N/A |
Yes |
www/ |
- |
- |
r |
N/A |
N/A |
N/A |
Yes |
Documents/ |
documentsDirectory |
documents |
r/w |
Yes |
No |
Yes |
Yes |
NoCloud/ |
- |
documents-nosync |
r/w |
Yes |
No |
No |
Yes |
Library |
- |
library |
r/w |
Yes |
No |
Yes? |
Yes |
NoCloud/ |
dataDirectory |
library-nosync |
r/w |
Yes |
No |
No |
Yes |
Cloud/ |
syncedDataDirectory |
- |
r/w |
Yes |
No |
Yes |
Yes |
Caches/ |
cacheDirectory |
cache |
r/w |
Yes* |
Yes*** |
No |
Yes |
tmp/ |
tempDirectory |
- |
r/w |
No** |
Android File System Layout
| Device Path | cordova.file.* | AndroidExtraFileSystems | r/w? | persistent? | OS clears | private |
|---|
file:///android_asset/ |
applicationDirectory |
|
r |
N/A |
N/A |
Yes |
/data/data// |
applicationStorageDirectory |
- |
r/w |
N/A |
N/A |
Yes |
cache |
cacheDirectory |
cache |
r/w |
Yes |
Yes* |
Yes |
files |
dataDirectory |
files |
r/w |
Yes |
No |
Yes |
Documents |
|
documents |
r/w |
Yes |
No |
Yes |
/ |
externalRootDirectory |
sdcard |
r/w |
Yes |
No |
No |
Android/data// |
externalApplicationStorageDirectory |
- |
r/w |
Yes |
No |
No |
cache |
externalCacheDirectry |
cache-external |
r/w |
Yes |
No** |
No |
files |
externalDataDirectory |
files-external |
r/w |
文件下载cordovaFileTransfer：cordova.file.documentsDirectory is null
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