前言
之前项目中通过Intent只是传输简单的字符串，这次因为需要在前一个页面联网获取对象数据，然后在下一个页面使用，所以考虑到使用Intent传输包含自定义类的ArrayList。
Serializable
Java的对象序列化指的是将那些实现了Serializable接口的对象转换成一个字节序列，并且能在需要的时候再将这个字节序列完全恢复为之前的对象。
想实现对象的序列化，需要实现java.io.Serializable接口（注意，这个接口只是一个标记接口，并没有具体需要override的方法）。当然，你也可以自己实现对象的序列化，但是我认为既然Java提供了这么一套对象序列化的机制，我们最好还是使用官方提供的方法。
Example
创建一个简单对象，并且实现Serializable接口
package javastudy;import java.io.Serializable;public class Person implements Serializable { private static final long serialVersionUID = -6470574927973900913L; private String firstName; private String secondName; // example for transinet private transient String noSerializableString; public Person(String firstName, String secondName, String noSerializableString) { super(); this.firstName = firstName; this.secondName = secondName; this.noSerializableString = noSerializableString; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getSecondName() { return secondName; } public void setSecondName(String secondName) { this.secondName = secondName; } public String getNoSerializableString() { if (noSerializableString != null) { return noSerializableString; } else { return ""; } } public void setNoSerializableString(String noSerializableString) { this.noSerializableString = noSerializableString; } public String toString() { return "Person [ first name :" + getFirstName() + ", second name :" + getSecondName() + ", no serializable :" + getNoSerializableString() + "]"; }}再写一个类，用于实现对象的序列化和反序列化
package javastudy;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;public class TestSerializable { public static void main(String[] args) { Person person = new Person("Wang", "Zhengyi", "Genius"); String fileName = "/tmp/person.out"; // save object to file FileOutputStream fos = null; ObjectOutputStream out = null; try { fos = new FileOutputStream(fileName); out = new ObjectOutputStream(fos); out.writeObject(person); out.flush(); } catch (Exception e) { e.printStackTrace(); } finally { if (fos != null) { try { fos.close(); } catch (IOException e) { e.printStackTrace(); } } if (out != null) { try { out.close(); } catch (IOException e) { e.printStackTrace(); } } } // read object from file FileInputStream fin = null; ObjectInputStream in = null; try { fin = new FileInputStream(fileName); in = new ObjectInputStream(fin); Person p = (Person) in.readObject(); System.out.println(p); } catch (Exception e) { e.printStackTrace(); } finally { if (fin != null) { try { fin.close(); } catch (IOException e) { e.printStackTrace(); } } if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } }}Intent传输包含自定义类的ArrayList
之所以之前介绍了Serializable，是因为这是实现Intent传输的前提，ArrayList包含的自定义类必须实现Serializable接口才能通过putSerializable（）方法被传递。
还是用上面的Person类作为自定义的类，则第一个传递ArrayList的Activity关键代码如下：
// Intent Creation and InitializationIntent passIntent = new Intent();passIntent.setClass(MainActivity.this, SecondaryActivity.class); // Create custom class ObjectPerson p1 = new Person("Wang", "Zhengyi", "first");Person p2 = new Person("Chen", "Shan", "second"); // Create Array List of custom Class and add the Created objectArrayList<Person> aListClass = new ArrayList<Person>();aListClass.add(p1);aListClass.add(p2); // Create a Bundle and Put Bundle in to itBundle bundleObject = new Bundle();bundleObject.putSerializable("key", aListClass); // Put Bundle in to Intent and call start ActivitypassIntent.putExtras(bundleObject);startActivity(passIntent);第二个接收ArrayList的Activity关键代码如下：
try{ // Get the Bundle Object Bundle bundleObject = getIntent().getExtras(); // Get ArrayList Bundle ArrayList<Person> classObject = (ArrayList<Person>) bundleObject.getSerializable("key"); Retrieve Objects from Bundle for(int index = 0; index < classObject.size(); index++){ Person person = classObject.get(index); Toast.makeText(getApplicationContext(), person, Toast.LENGTH_SHORT).show(); }} catch(Exception e){ e.printStackTrace();}