Java tutorial
//package com.java2s; import android.util.Log; import java.io.File; import java.io.FileOutputStream; import java.io.ObjectOutputStream; public class Main { public static final String TAG = "P2PUtils"; public static void writeObject(String root, String filename, Object object) { File file = new File(root, filename); try { FileOutputStream fos = new FileOutputStream(file); ObjectOutputStream oos = new ObjectOutputStream(fos); oos.writeObject(object); oos.flush(); oos.close(); } catch (Exception e) { Log.e(TAG, String.format("Failed to write [%s]", file), e); } } }