Android中如何使用Intent在Activity之间传递对象[使用Serializable或者Parcelable]

在Android中的不同Activity之间传递对象，我们可以考虑采用Bundle.putSerializable(Key,Object);也可以考虑采用Bundle.putParcelable(Key, Object);其中前面一种方法中的Object要实现Serializable接口，后面一种方法中的Object要实现Parcelable接口。下面我们以一个完整的例子来说明。

1.新建一个Android的工程，其中该工程的目录结构如下图：

2. 修改main.xml布局文件。布局文件的源码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
    <Button
       android:id="@+id/serButton"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:text="Serializable"/>
    <Button
       android:id="@+id/parButton"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:text="Parcelable"/>
</LinearLayout>

3.在工程的src目录下新建一个实体类包，命名为com.andy.entity.同时在该package中添加两个实体类，一个是Person.java，该类实现Serializable接口；一个是Police.java，该类实现Parcelable接口。代码分别如下：

Person.java:

package com.andy.entity;

import java.io.Serializable;

public class Person implements Serializable {
	
	private static final long serialVersionUID = -6919461967497580385L;
	
	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;
	}
}

Police.java:

package com.andy.entity;

import android.os.Parcel;
import android.os.Parcelable;

public class Police implements Parcelable {
	
	private String name;
	private int workTime;

	public String getName() {
		return name;
	}

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

	public int getWorkTime() {
		return workTime;
	}

	public void setWorkTime(int workTime) {
		this.workTime = workTime;
	}
	
	public static final Parcelable.Creator<Police> CREATOR = new Creator<Police>() {

		@Override
		public Police createFromParcel(Parcel source) {
			Police police = new Police();
			police.name = source.readString();
			police.workTime = source.readInt();
			return police;
		}

		@Override
		public Police[] newArray(int size) {
			return new Police[size];
		}
	};

	@Override
	public int describeContents() {
		return 0;
	}

	@Override
	public void writeToParcel(Parcel parcel, int flags) {
		parcel.writeString(name);
		parcel.writeInt(workTime);
	}
}

4.在包com.andy.testdemo中修改TestActivity.java类，同时在该包中添加类SerializableDemo和ParcelableDemo，分别继承了Activity类和分别显示Person对象和Police对象的数据。代码如下：

package com.andy.testdemo;

import com.andy.entity.Person;
import com.andy.entity.Police;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class TestActivity extends Activity {
	private Button sButton,pButton;
	public final static String SER_KEY = "com.andy.ser";
	public final static String PAR_KEY = "com.andy.par";
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        sButton = (Button)findViewById(R.id.serButton);
        sButton.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				SerializeMethod();
			}
		});
        
        pButton = (Button)findViewById(R.id.parButton);
        pButton.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				PacelableMethod();
			}
		});
    }
    
    /**
     * Serializeable传递对象的方法
     */
    private void SerializeMethod(){
    	Person mPerson = new Person();   
    	mPerson.setName("andy");   
    	mPerson.setAge(26);   
    	Intent mIntent = new Intent(this,SerializableDemo.class);   
    	Bundle mBundle = new Bundle();   
    	mBundle.putSerializable(SER_KEY,mPerson);   
    	mIntent.putExtras(mBundle);   
    	
        startActivity(mIntent);   
    }
    
    /**
     * Pacelable传递对象方法 
     */
    private void PacelableMethod(){
    	Police mPolice = new Police();   
    	mPolice.setName("I am Police");      
    	mPolice.setWorkTime(2008);   
    	Intent mIntent = new Intent(this,ParcelableDemo.class);   
    	Bundle mBundle = new Bundle();   
    	mBundle.putParcelable(PAR_KEY, mPolice);   
    	mIntent.putExtras(mBundle);   
     
    	startActivity(mIntent);   
    }
}

SerializableDemo.java类

package com.andy.testdemo;

import com.andy.entity.Person;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class SerializableDemo extends Activity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		TextView mTextView = new TextView(this);   
		Person mPerson = (Person)getIntent().getSerializableExtra(TestActivity.SER_KEY);   
		mTextView.setText("You name is: " + mPerson.getName() + "/n"+   
		                  "You age is: " + mPerson.getAge());   

	    setContentView(mTextView);   
	}

}

ParcelableDemo.java类：

package com.andy.testdemo;

import com.andy.entity.Police;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class ParcelableDemo extends Activity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		TextView mTextView = new TextView(this);   
		Police mPolice = (Police)getIntent().getParcelableExtra(TestActivity.PAR_KEY);   
		mTextView.setText("Police name is: " + mPolice.getName()+"/n"+   
                          "WorkTime is: " + mPolice.getWorkTime() + "/n");   
		setContentView(mTextView);   
	}

}

5.在AndroidManifest.xml文件中为新添加的两个Activity进行注册。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.andy.testdemo"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".TestActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".SerializableDemo"/>
        <activity android:name=".ParcelableDemo"/>
    </application>
    <uses-sdk android:minSdkVersion="8" />

</manifest> 

6.运行程序查看效果图：

【1】主界面截图：

【2】点击Serializable按钮的效果

【3】点击Parcelable按钮的效果

=========================================================================

以上是如何采用Intent在不同的Activity之间传递对象的例子。

评论

1 楼 追逐779 2012-08-03  

有谁知到怎样在android的intent的putExtras传一个可变的值！