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NullPointer Exception in Cordova 3.5 android File Plugin

I recently upgraded my cordova app from v2.9 to v3.5. I added the needed plugins through command line and did a cordova build of my app. I am getting a Nullpointer Exception when I read/write a file through file plugin. Below is the stack trace:

07-08 18:58:40.750: W/System.err(6670): java.lang.NullPointerException
07-08 18:58:40.750: W/System.err(6670):     at org.apache.cordova.file.LocalFilesystem.filesystemPathForURL(LocalFilesystem.java:67)
07-08 18:58:40.750: W/System.err(6670):     at org.apache.cordova.file.LocalFilesystem.getFileForLocalURL(LocalFilesystem.java:189)
07-08 18:58:40.750: W/System.err(6670):     at org.apache.cordova.file.FileUtils.getFile(FileUtils.java:749)
07-08 18:58:40.760: W/System.err(6670):     at org.apache.cordova.file.FileUtils.access$5(FileUtils.java:742)
07-08 18:58:40.760: W/System.err(6670):     at org.apache.cordova.file.FileUtils$16.run(FileUtils.java:397)
07-08 18:58:40.760: W/System.err(6670):     at org.apache.cordova.file.FileUtils$23.run(FileUtils.java:525)
07-08 18:58:40.760: W/System.err(6670):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
07-08 18:58:40.760: W/System.err(6670):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
07-08 18:58:40.760: W/System.err(6670):     at java.lang.Thread.run(Thread.java:856)

I need some immediate help here!!

Nullpointer Exception solved, but need help in file access

I would like to know, what should be the pattern of the url for a file access from the app's private package. In cordova 2.9, I was accessing it as /data/data/com.myapp.android/abc.txt from the Javascript. May I know what is the format of the url now in cordova 3.5?

Solution

  • I managed to solve it by storing my app files in /mnt/sdcard/Android/data/com.myapp.android/ folder. This location will be private to my app, and will be cleared when the app is uninstalled.

    Now, I can read/write files from javascript using cordova's File plugin, and a file path will be like: Android/data/com.myapp.android/abc.txt. Since File plugin considers Compatibility as the default value for preference AndroidPersistentFileLocation in config.xml, the persistent file store will be returned as /mnt/sdcard (if mounted), which is by default in Android.

    Reference: Google groups link