disk size check

StorageUtil.java

    /** 有効サイズ(10MB) */
    private static final long AVAILABLE_DISK_SIZE = 10 * 1024 * 1024;

    public static boolean isDiskAvailable() {
        return isDiskAvailable(AVAILABLE_DISK_SIZE);
    }

    public static boolean isDiskAvailable(long limitSize) {
        long diskAvailableSize = getDiskAvailableBytes();
        return diskAvailableSize > limitSize;
    }

    public static long getDiskAvailableBytes() {
        StatFs sf = new StatFs("/mnt/sdcard");
        long blockSize = sf.getBlockSize(); // byte
        long availableBlocks = sf.getAvailableBlocks();
        return blockSize * availableBlocks;
    }