Android Utililty Methods File Size get

if (!file.exists()) {
    throw new IllegalArgumentException(file + " does not exist");
if (file.isDirectory()) {
    return sizeOfDirectory(file);
} else {
    return file.length();

if (file.exists()) {
    return file.length();
} else {
    return 0;

long size = 0;
File flist[] = f.listFiles();
for (int i = 0; i < flist.length; i++) {
    if (flist[i].isDirectory()) {
        size = size + getFileSize(flist[i]);
    } else {
        size = size + flist[i].length();
return size;

long s = 0;
if (f.exists()) {
    FileInputStream fis = null;
    fis = new FileInputStream(f);
    s = fis.available();
} else {
    f.createNewFile();
return s;

return fileLength(new File(filePath).length());

String lenStr = null;
DecimalFormat formater = new DecimalFormat("#0.##");
if (length < 1024) {
    lenStr = formater.format(length) + " Byte";
} else if (length < 1024 * 1024) {
    lenStr = formater.format(length / 1024.0f) + " KB";
} else if (length < 1024 * 1024 * 1024) {
    lenStr = formater.format(length / (1024 * 1024)) + " MB";
...

Long fileLength = null;
try {
    FileInputStream in = new FileInputStream(path);
    File file = new File(path);
    fileLength = file.length();
} catch (FileNotFoundException e) {
    e.printStackTrace();
return fileLength;

int freeUnit;
for (freeUnit = 0; fileSize >= 100; freeUnit++) {
    fileSize /= 1024;
DecimalFormat decFormat = new DecimalFormat("0.0");
String doubleString = decFormat.format(fileSize);
StringBuffer buffer = new StringBuffer();
buffer.append(doubleString);
...