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From "Andrew Grieve (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CB-285) Add property returning root path of PhoneGap files
Date Tue, 22 Jan 2013 15:44:13 GMT

    [ https://issues.apache.org/jira/browse/CB-285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13559719#comment-13559719
] 

Andrew Grieve commented on CB-285:
----------------------------------

I'd like to list out all of the potential storage areas, and then let's talk about whether
we should map them to a requestLocalFilesystem constant.

Android (http://developer.android.com/guide/topics/data/data-storage.html):
- Resources.raw
  - no URL mapping
  - read-only
  - no subdirectories
  - iteration through reflection only?
- Assets directory
  - file://android_assets (URL mapping works only for initial page load?)
  - read-only
  - includes www directory
- Internal app storage
  - file:///data/data/$PACKAGE_NAME/files
  - read-write
  - Use Context.openFileOutput / Context.fileList
- Internal cache
  - file:///data/data/$PACKAGE_NAME/cache
  - Context.getCacheDir()
- External app storage:
  - file:///sdcard/Android/data/$PACKAGE_NAME/files
  - or this?: content://com.android.htmlfileprovider/
  - Context.getExternalFilesDir()
  - Requires WRITE_EXTERNAL_STORAGE permission
- External cache
  - file:///sdcard/Android/data/$PACKAGE_NAME/cache
  - Context.getExternalCacheDir()
  - Requires WRITE_EXTERNAL_STORAGE permission
- External root (Root sdcard)
  - file:///sdcard
  - Context.getExternalFilesDir(null) or Environment.getExternalStorageDirectory()
  - Requires WRITE_EXTERNAL_STORAGE permission
- External media (shared files)
  - file:///sdcard/Music / Photos / etc.
  - Context.getExternalFilesDir(Environment.DIRECTORY_PICTURES)
  - Requires WRITE_EXTERNAL_STORAGE permission


Complicated enough? :P

Looking at our current implementation of requestLocalFilesystem(), we use:

PERSISTENT ==> "External root" if sdcard is mounted, "Internal app storage" otherwise (minus
the "/files" suffix)
TEMPORARY ==> "External cache" if sdcard is mounted, "Internal cache" otherwise.


I'll dig into iOS next.

                
> Add property returning root path of PhoneGap files
> --------------------------------------------------
>
>                 Key: CB-285
>                 URL: https://issues.apache.org/jira/browse/CB-285
>             Project: Apache Cordova
>          Issue Type: Improvement
>          Components: CordovaJS
>    Affects Versions: 1.4.0
>         Environment: Both PhoneGap SDK and PhoneGap Build
>            Reporter: Ashley Gullen
>            Assignee: Andrew Grieve
>              Labels: features
>
> There needs to be a property in PhoneGap that returns the root path to the general files
added to the PhoneGap project (i.e. the directory index.html is in).  For example, if I add
'music.mp3' to my project, in Android it will be located in:
> /android_asset/www/music.mp3
> On iOS after being built with PhoneGap Build it will be located in some path like this:
> /var/mobile/Applications/<app_ID>/<name>.app/www/music.mp3
> However, there does not appear to be a programmatic way to determine both <app_ID>
and <name>.app.
> This has two side effects:
> 1. Paths to audio for Media must be hard-coded separately depending on the platform,
which is inconvenient.
> 2. Paths to audio for Media cannot be known if developing a framework that uses PhoneGap.
 Since a framework does not know the App ID or name in advance, it's impossible for the framework
to determine the correct path.
> This is actively blocking audio from working on iOS in PhoneGap projects exported by
Construct 2 (www.scirra.com), a HTML5 game creator.  Also, it seems like kind of an important
function to make available anyway, since hard-coding paths for each platform is a pain.
> This PhoneGap Support thread led to this issue: http://phonegap.tenderapp.com/discussions/questions/208-android_asset-equivalent-for-ios

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