Java – programmatically check whether there is enough memory on the SD card

My application is saving the file on the SD card, but before saving the file, I need to check whether there is free memory I need to check how much memory is available on the SD card

It's like:

if(MemoryCard.getFreeMemory()>20Mb)
{
    saveFiles();
}
else
{
    Toast.makeText(this,"Not enough memory",100).show();
}

Solution

come from: http://groups.google.com/group/android-developers/browse_thread/thread/ecede996463a4058

StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getPath());
long bytesAvailable = (long)stat.getBlockSize() * (long)stat.getBlockCount();
long megAvailable = bytesAvailable / 1048576;