Android之Activity其间传递对象

在很多时候，我们需要在Activity之间传递对象，比如当你点击了某列表的item，需要传递给下一个Activity该对象，那我们需要该怎么做呢？

Android支持两种传递对象的方式，一种是bundle.putSerializable方式，一种是bundle.putParcelable。

那么下面我们就用一个例子来实践Activity传递对象：

1.首先建立两个类，一个Teacher类表示老师，一个Student类表示学生。内容分别如下：

<span style="font-size:18px;">public class Teacher implements Serializable {	private static final long serialVersionUID = -7060210544600464481L;	private String name;	private int age;	private String addr;	public Teacher(String name, int age, String addr) {		super();		this.name = name;		this.age = age;		this.addr = addr;	}	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 String getAddr() {		return addr;	}	public void setAddr(String addr) {		this.addr = addr;	}	@Override	public String toString() {		String temp = "老师姓名：" + this.name + " 年龄：" + this.age + " 地址："				+ this.addr;		return temp;	}}</span>

<span style="font-size:18px;">import android.os.Parcel;import android.os.Parcelable;public class Student implements Parcelable {	private String name;	private int age;	private String addr;	public static final Parcelable.Creator<Student> CREATOR = new Creator<Student>() {		@Override		public Student[] newArray(int size) {			return new Student[size];		}		@Override		public Student createFromParcel(Parcel source) {			Student stu = new Student();			stu.name = source.readString();			stu.age = source.readInt();			stu.addr = source.readString();			return stu;		}	};	@Override	public int describeContents() {		// TODO Auto-generated method stub		return 0;	}	@Override	public void writeToParcel(Parcel dest, int flags) {		dest.writeString(name);		dest.writeInt(age);		dest.writeString(addr);	}		public Student(){			}		public Student(String name, int age, String addr) {		super();		this.name = name;		this.age = age;		this.addr = addr;	}	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 String getAddr() {		return addr;	}	public void setAddr(String addr) {		this.addr = addr;	}		@Override	public String toString() {		String temp = "学生姓名：" + this.name + " 年龄：" + this.age + " 地址："				+ this.addr;		return temp;	}	}</span>

其中Teacher类实现了Serializable接口，Student类实现了Parcelable接口。

2.创建两个Activity，第一个Activity叫做FirstActivity，它里面有两个对象：一个Teacher对象，一个Student对象，我们现在需要将这两个对象传递给第二个Activity，即SecondActivity。

首先我们看一下FirstActivity的布局：

FirstActivity的内容如下：

import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;public class FirstActivity extends Activity implements OnClickListener{		public static final String TEACHER_KEY = "key_teacher";	public static final String STUDENT_KEY = "key_student";		private Teacher teacher = new Teacher("刘备", 36, "荆州");	private Student student = new Student("张飞", 32, "新野");		@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_first);				findViewById(R.id.button1).setOnClickListener(this);	}	@Override	public void onClick(View v) {		switch (v.getId()) {		case R.id.button1:			Bundle bundle = new Bundle();			bundle.putSerializable(TEACHER_KEY, teacher);			bundle.putParcelable(STUDENT_KEY, student);			Intent intent = new Intent(FirstActivity.this,SecondActivity.class);			intent.putExtras(bundle);			startActivity(intent);			break;		default:			break;		}			}}

里面就只有一个TextView。

然后我们看一下SecondActivity的内容，它主要是将传递过来的对象显示到TextView当中：

import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.Menu;import android.widget.TextView;public class SecondActivity extends Activity {	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_second);				Intent intent = this.getIntent();		Bundle bundle = intent.getExtras();		Teacher t = (Teacher) bundle.getSerializable(FirstActivity.TEACHER_KEY);		Student s = bundle.getParcelable(FirstActivity.STUDENT_KEY);				String text = t.toString() + "\n" + s.toString();				((TextView)findViewById(R.id.text_view)).setText(text);	}}

很显然，这两种方式都可以成功的在Activity之间传递对象。

希望以上内容对各位读者能够带来帮助！