Intent.putExtra()传递Object对象或者ArrayList<Object> (转)

Intent传递基本类型相信大家都十分熟悉，如何传递Object对象或者ArrayList<Object>对象呢？

可以通过：

（1）public Intent putExtra (String name, Serializable value)

（2）public Intent putExtra (String name, Parcelable value)

public Intent putParcelableArrayListExtra(String name, ArrayList<? extends Parcelable> value)

一、通过实现Serializable接口传递

（1）首先让Person继承Serializable接口

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1. 1. 
      
2. package com.example.hellojni;
3. 
   
4. import java.io.Serializable;
5. 
   
6. public class Person implements Serializable{
7. 
   
8. /**
9. * Auto generate
10. */
11. private static final long serialVersionUID = -5053412967314724078L;
12. 
    
13. private String name;
14. 
    
15. private int age;
16. 
    
17. public Person(String name, int age) {
18. this.name = name;
19. this.age = age;
20. }
21. 
    
22. public String getName() {
23. return name;
24. }
25. 
    
26. public void setName(String name) {
27. this.name = name;
28. }
29. 
    
30. public int getAge() {
31. return age;
32. }
33. 
    
34. public void setAge(int age) {
35. this.age = age;
36. }
37. 
    
38. }
    1. 
       

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1. 1. 
      
2. package com.example.hellojni;
3. 
   
4. import java.io.Serializable;
5. 
   
6. public class Person implements Serializable{
7. 
   
8. /**
9. * Auto generate
10. */
11. private static final long serialVersionUID = -5053412967314724078L;
12. 
    
13. private String name;
14. 
    
15. private int age;
16. 
    
17. public Person(String name, int age) {
18. this.name = name;
19. this.age = age;
20. }
21. 
    
22. public String getName() {
23. return name;
24. }
25. 
    
26. public void setName(String name) {
27. this.name = name;
28. }
29. 
    
30. public int getAge() {
31. return age;
32. }
33. 
    
34. public void setAge(int age) {
35. this.age = age;
36. }
37. 
    
38. }
    1. 
       

（2）通过Intent来进行传输，具体方法是：public Intent putExtra (String name, Serializable value)

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1. 1. 
      
2. Intent intent = new Intent(this, OtherActivity.class);
3. intent.putExtra("person", new Person("bear", 22));
4. startActivity(intent);
   1. 
      

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1. 1. 
      
2. Intent intent = new Intent(this, OtherActivity.class);
3. intent.putExtra("person", new Person("bear", 22));
4. startActivity(intent);
   1. 
      

（3）另外一个Activity中打印值：

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1. 1. 
      
2. Intent intent = getIntent();
3. Person person = (Person)intent.getSerializableExtra("person");
4. System.out.println("name:" + person.getName());
5. System.out.println("age:" + person.getAge());
   1. 
      

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1. 1. 
      
2. Intent intent = getIntent();
3. Person person = (Person)intent.getSerializableExtra("person");
4. System.out.println("name:" + person.getName());
5. System.out.println("age:" + person.getAge());
   1. 
      

（4）传递ArrayList<Person>：

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1. 1. 
      
2. Intent intent = new Intent(this, OtherActivity.class);
3. ArrayList<Person> personList= new ArrayList<Person>();
4. initList(personList); //初始化personList
5. intent.putExtra("personList", personList);
6. startActivity(intent);
   1. 
      

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1. 1. 
      
2. Intent intent = new Intent(this, OtherActivity.class);
3. ArrayList<Person> personList= new ArrayList<Person>();
4. initList(personList); //初始化personList
5. intent.putExtra("personList", personList);
6. startActivity(intent);
   1. 
      

（注意传值类型必须是ArrayList而不能是List。调用的还是public Intent putExtra (String name, Serializable value)这个函数，另外一边获取的时候强制转化为ArrayList<Person>即可）

二、通过实现Parcelable接口传递

同上，Person类实现Parcelable接口即可：

传递Object用：public Intent putExtra (String name, Parcelable value)

传递ArrayList<Object>用：public Intent putParcelableArrayListExtra(String name, ArrayList<? extends Parcelable> value)

（同是序列化的接口，为神马Parcelable分开提供了2个函数，而传Serializable只提供了一个？这里我也很不解。。。）