android backup apk file

backupApk

private void testBackupFile() throws IOException {
	File file = new File("/data/app/fq.router2-2.apk");
	if (file.exists()) {
		Log.d("command", "get file");
		File dir = new File("/sdcard/mikeBackUp");
		if (!dir.exists()) {
			dir.mkdirs();
		}
		copyFile(file, new File(dir, "FqRouter.apk"));

	} else {
		Log.d("command", "empty file");
	}

}

public void copyFile(File src, File dst) throws IOException {
	InputStream in = new FileInputStream(src);
	OutputStream out = new FileOutputStream(dst);

	// Transfer bytes from in to out
	byte[] buf = new byte[1024];
	int len;
	while ((len = in.read(buf)) > 0) {
		out.write(buf, 0, len);
	}
	in.close();
	out.close();
}

public static String readableFileSize(long size) {
	if(size <= 0) return "0";
	final String[] units = new String[] { "B", "KB", "MB", "GB", "TB" };
	int digitGroups = (int) (Math.log10(size)/Math.log10(1024));
	return new DecimalFormat("#,##0.#").format(size/Math.pow(1024, digitGroups)) + " " + units[digitGroups];
}