Android 中通过Intent传递类对象，通过实现Serializable和Parcelable接口两种方式传递对象

package com.example.daydemo.bean;
import java.io.Serializable;
//必须实现Serializable接口，此对象才有传递的资格
public class Person implements Serializable {
    private String name;
    private int 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.daydemo;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import com.example.daydemo.bean.Person;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn=findViewById(R.id.btn);
        btn.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        Intent intent = new Intent(this,MainActivity2.class);
        Person person = new Person();
        person.setName("Android");
        person.setAge(30);
        intent.putExtra("person",person);
        startActivity(intent);
    }
}

public class MainActivity2 extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        //接收MainActivity传过来的对象
        Intent intent = getIntent();
        Person person = (Person) intent.getSerializableExtra("person");
        Toast.makeText(this, "姓名："+person.getName()
                +" 年龄："+person.getAge()
                , Toast.LENGTH_SHORT).show();
    }
}

package com.example.daydemo.bean;
import android.os.Parcel;
import android.os.Parcelable;
//此对象实现Parcelable接口，就具备传递的资格
public class Student implements Parcelable {
    //自定义成员变量
    private String name;
    private int age;
    public Student() {
    }
    //TODO 注意：读取,和写入的顺序,必须一致，否则会报错
    //从Parcel对象中读取出来，赋值给name,age
    public Student(Parcel in) {
        name = in.readString();
        age = in.readInt();
    }
    //把属性写入到Parcel对象里面去
    //将当前对象的属性数据打成包：写到包对象
    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(name);
        dest.writeInt(age);
    }
    //系统扩展用的，忽略
    @Override
    public int describeContents() {
        return 0;
    }
    public static final Creator<Student> CREATOR = new Creator<Student>() {
        //创建Student对象，并且把Parcel构建好，传递给我们的Student(成员数据就可以从Parcel对象获取了)
        //解包：读取包中的数据并封装成对象
        @Override
        public Student createFromParcel(Parcel in) {
            return new Student(in);
        }
    //返回一个指定大小的对象容器
        @Override
        public Student[] newArray(int size) {
            return new Student[size];
        }
    };
    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;
    }
}

public class FirstActivity extends AppCompatActivity implements View.OnClickListener {
    private Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_first);
        btn=findViewById(R.id.btn);
        btn.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        Intent intent = new Intent(this,SecondActivity.class);
        Student student = new Student();
        student.setName("程序员");
        student.setAge(18);
        intent.putExtra("student",student);
        startActivity(intent);
    }
}

public class SecondActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        Intent intent = getIntent();
        Student student = intent.getParcelableExtra("student");
        Toast.makeText(this, "姓名："+student.getName()
                +" 年龄："+student.getAge(), Toast.LENGTH_SHORT).show();
    }
}