Bytes and file convert methods

Files.java

import android.content.Context;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class Files {
    public static byte[] readFromFile(File file, int length) {
        ByteArrayOutputStream ous = null;
        InputStream ios = null;
        try {
            byte[] buffer = new byte[length];
            ous = new ByteArrayOutputStream();
            ios = new FileInputStream(file);
            int read;
            while ((read = ios.read(buffer)) != -1) {
                ous.write(buffer, 0, read);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (ous != null) ous.close();
                if (ios != null) ios.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return ous.toByteArray();
    }

    public static void byteToFile(Context context, byte[] bytes, String name) {
        OutputStream os = null;
        try {
            os = context.openFileOutput(name, Context.MODE_PRIVATE);
            os.write(bytes, 0, bytes.length);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (os != null) os.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}