Android Emulator sdcard push error: Read-only file system

I found this works

$./adb shell
$su
mount -o rw,remount rootfs /
chmod 777 /mnt/sdcard
exit

Source: http://www.coderanch.com/t/611842/Android/Mobile/Android-emulator-sdcard-writable

Once you started the Emulator from one shell, login to another shell & type

adb shell

You should see # prompt displayed, this is your device(emulator) shell. Now , type following command at adb shell.

mount -o remount rw /sdcard

This will now remount /sdcard with rw(read-write) permission & now you can push your files into /sdcard by using following command from your host shell.

`adb push filename.mp3 /sdcard,`

where filename.mp3 could be any file that you want to push into Android Emulator.

Hope this helps :)