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

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  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

 

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以上是如何采用Intent在不同的Activity之间传递对象的例子。