Java tutorial
//package com.java2s; import android.content.Context; import android.support.annotation.NonNull; import android.text.TextUtils; import java.io.FileOutputStream; import java.io.ObjectOutputStream; public class Main { public static boolean saveObject(@NonNull Context context, Object obj, String fileName) { if (obj == null || TextUtils.isEmpty(fileName)) { return false; } FileOutputStream fos = null; ObjectOutputStream oos = null; try { fos = context.openFileOutput(fileName, Context.MODE_PRIVATE); oos = new ObjectOutputStream(fos); oos.writeObject(obj); oos.flush(); return true; } catch (Exception e) { e.printStackTrace(); return false; } finally { try { if (fos != null) fos.close(); if (oos != null) oos.close(); } catch (Exception e) { e.printStackTrace(); } } } }