/**
* do this only *after* you have checked external storage state:
**/
File extdir = Environment.getExternalStorageDirectory();
StatFs stats = new StatFs(extdir.getAbsolutePath());
int availableBytes = stats.getAvailableBlocks() * stats.getBlockSize();
Log.d("Available Space :", String.valueOf(availableBytes) + "Bytes");
/**
* Check SDCard Available Or Not
**/
Boolean isSDPresent = android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);
if(isSDPresent)
{
// yes SD-card is present
}
else
{
// No Sdcard Is Present
}