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

package com.example.hellojni;

import java.io.Serializable;

public class Person implements Serializable{

    /**
     * Auto generate
     */
    private static final long serialVersionUID = -5053412967314724078L;

    private String name;

    private int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

}

package com.example.hellojni;

import java.io.Serializable;

public class Person implements Serializable{

    /**
     * Auto generate
     */
    private static final long serialVersionUID = -5053412967314724078L;

    private String name;

    private int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

}

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

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

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

 

（3）另外一个Activity中打印值：

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

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

（4）传递ArrayList<Person>：

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

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

（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。。。）

转自：链接