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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
| Device Path | cordova.file.* | iosExtraFileSystems | r/w? | persistent? | OS clears | sync | private |
|---|---|---|---|---|---|---|---|
/var/mobile/Applications/<UUID>/ |
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** |
| Device Path | cordova.file.* | AndroidExtraFileSystems | r/w? | persistent? | OS clears | private |
|---|---|---|---|---|---|---|
file:///android_asset/ |
applicationDirectory | r | N/A | N/A | Yes | |
/data/data/<app-id>/ |
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 | |
<sdcard>/ |
externalRootDirectory | sdcard | r/w | Yes | No | No |
Android/data/<app-id>/ |
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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原文地址：http://www.cnblogs.com/yshyee/p/4516662.html
