android emulator - any accessible storage space?

问题

I am getting

java.io.FileNotFoundException: /sdcard/Img_1316563834614.jpg (Permission denied)

after trying

mRAF = new RandomAccessFile(mFullPath, "rws");

where mFullPath was /sdcard/image6456.jpg, /mnt/sdcard/image3579.jpg, file:///sdcard/image34567.jpg, etc. Nothing works. There is already an

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

line in AndroidManifest.xml

I have checked that the path /mnt/sdcard is actually there. Also the call

getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS);

gives out null. I should not wonder though...

What am I missing ?

Thanks

回答1:

The emulator does not come with external storage, unless you define some in the AVD. See the "SD Card" group box in the Add Android Virtual Device or Edit Android Virtual Device dialogs:

In this one, I defined 32MB of external storage. By default, the Size field is blank, meaning no external storage.

来源：https://stackoverflow.com/questions/7493225/android-emulator-any-accessible-storage-space