DiskUtils.java

package com.tom.utils;

import android.annotation.SuppressLint;
import android.os.Build;
import android.os.Environment;
import android.os.StatFs;

/**
 * Created by Tom on 7/15/13.
 * Some helper methods for FS queries.
 */
public class DiskUtils {
    private static final long MEGA_BYTE = 1048576;

    static int sdkInt = Build.VERSION.SDK_INT;

    /**
     * Calculates total space on disk
     *
     * @param external If true will query external disk, otherwise will query internal disk.
     * @return Number of mega bytes on disk.
     */
    @SuppressLint("NewApi")
    @SuppressWarnings("deprecation")
    public static int totalSpace(boolean external) {
        StatFs statFs = getStats(external);
        long totalBytes;
        if (sdkInt < Build.VERSION_CODES.JELLY_BEAN_MR2) {
            int blockSize = statFs.getBlockSize();
            totalBytes = (((long) statFs.getBlockCount()) * blockSize) / MEGA_BYTE;
        } else {
            totalBytes = statFs.getTotalBytes();
        }
        return (int) totalBytes;
    }

    /**
     * Calculates free space on disk
     *
     * @param external If true will query external disk, otherwise will query internal disk.
     * @return Number of free mega bytes on disk.
     */
    @SuppressLint("NewApi")
    @SuppressWarnings("deprecation")
    public static int freeSpace(boolean external) {

        StatFs statFs = getStats(external);

        long totalBytes;
        long availableBytes;
        if (sdkInt < Build.VERSION_CODES.JELLY_BEAN_MR2) {
            int blockSize = statFs.getBlockSize();
            availableBytes = ((long) statFs.getAvailableBlocks()) * blockSize;
        } else {
            availableBytes = statFs.getAvailableBytes();
        }

        return (int) (availableBytes / MEGA_BYTE);
    }

    /**
     * Calculates occupied space on disk
     *
     * @param external If true will query external disk, otherwise will query internal disk.
     * @return Number of occupied mega bytes on disk.
     */
    @SuppressLint("NewApi")
    @SuppressWarnings("deprecation")
    public static int busySpace(boolean external) {
        StatFs statFs = getStats(external);

        long totalBytes;
        long availableBytes;
        if (sdkInt < Build.VERSION_CODES.JELLY_BEAN_MR2) {
            int blockSize = statFs.getBlockSize();
            availableBytes = ((long) statFs.getAvailableBlocks()) * blockSize;
            totalBytes = ((long) statFs.getBlockCount()) * blockSize;
        } else {
            availableBytes = statFs.getAvailableBytes();
            totalBytes = statFs.getTotalBytes();
        }

        return (int) ((totalBytes - availableBytes) / MEGA_BYTE);
    }

    private static StatFs getStats(boolean external) {
        String path;

        if (external) {
            path = Environment.getExternalStorageDirectory().getAbsolutePath();
        } else {
            path = Environment.getRootDirectory().getAbsolutePath();
        }

        return new StatFs(path);
    }

}