How can I check how much free space an SD card mounted on an Android device has?

Question

How can I programmatically check how much free space an SD card mounted on an Android device has?

Answer 1

/**
 * This class is designed to get available space in external storage of android. 
 * It contains methods which provide you the available space in different units e.g
 * bytes, KB, MB, GB. OR you can get the number of available blocks on external storage.
 *
 */
public class AvailableSpaceHandler {

    //*********
    //Variables
    /**
     * Number of bytes in one KB = 210
     */
    public final static long SIZE_KB = 1024L;

    /**
     * Number of bytes in one MB = 220
     */
    public final static long SIZE_MB = SIZE_KB * SIZE_KB;

    /**
     * Number of bytes in one GB = 230
     */
    public final static long SIZE_GB = SIZE_KB * SIZE_KB * SIZE_KB;

    //********
    // Methods

    /**
     * @return Number of bytes available on external storage
     */
    public static long getExternalAvailableSpaceInBytes() {
        long availableSpace = -1L;
        try {
            StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getPath());
            availableSpace = (long) stat.getAvailableBlocks() * (long) stat.getBlockSize();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return availableSpace;
    }


    /**
     * @return Number of kilo bytes available on external storage
     */
    public static long getExternalAvailableSpaceInKB(){
        return getExternalAvailableSpaceInBytes()/SIZE_KB;
    }
    /**
     * @return Number of Mega bytes available on external storage
     */
    public static long getExternalAvailableSpaceInMB(){
        return getExternalAvailableSpaceInBytes()/SIZE_MB;
    }

    /**
     * @return gega bytes of bytes available on external storage
     */
    public static long getExternalAvailableSpaceInGB(){
        return getExternalAvailableSpaceInBytes()/SIZE_GB;
    }

    /**
     * @return Total number of available blocks on external storage
     */
    public static long getExternalStorageAvailableBlocks() {
        long availableBlocks = -1L;
        try {
            StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getPath());
            availableBlocks = stat.getAvailableBlocks();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return availableBlocks;
    }
}