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:
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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:orientation="vertical"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent"
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>
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<TextView
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:text="@string/hello"
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/>
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<Button
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android:id="@+id/serButton"
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:text="Serializable"/>
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<Button
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android:id="@+id/parButton"
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:text="Parcelable"/>
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</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:
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package com.andy.entity;
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import java.io.Serializable;
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public class Person implements Serializable {
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private static final long serialVersionUID = -6919461967497580385L;
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private String name;
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private int age;
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public int getAge() {
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return age;
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}
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public void setAge(int age) {
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this.age = age;
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}
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}
Police.java:
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package com.andy.entity;
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import android.os.Parcel;
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import android.os.Parcelable;
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public class Police implements Parcelable {
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private String name;
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private int workTime;
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public int getWorkTime() {
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return workTime;
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}
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public void setWorkTime(int workTime) {
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this.workTime = workTime;
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}
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public static final Parcelable.Creator<Police> CREATOR = new Creator<Police>() {
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@Override
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public Police createFromParcel(Parcel source) {
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Police police = new Police();
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police.name = source.readString();
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police.workTime = source.readInt();
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return police;
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}
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@Override
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public Police[] newArray(int size) {
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return new Police[size];
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}
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};
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@Override
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public int describeContents() {
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return 0;
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}
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@Override
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public void writeToParcel(Parcel parcel, int flags) {
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parcel.writeString(name);
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parcel.writeInt(workTime);
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}
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}
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:
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package com.andy.testdemo;
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import com.andy.entity.Person;
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import com.andy.entity.Police;
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import android.app.Activity;
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import android.content.Intent;
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import android.os.Bundle;
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import android.view.View;
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import android.widget.Button;
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public class TestActivity extends Activity {
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private Button sButton,pButton;
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public final static String SER_KEY = "com.andy.ser";
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public final static String PAR_KEY = "com.andy.par";
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/** Called when the activity is first created. */
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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sButton = (Button)findViewById(R.id.serButton);
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sButton.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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SerializeMethod();
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}
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});
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pButton = (Button)findViewById(R.id.parButton);
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pButton.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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PacelableMethod();
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}
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});
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}
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/**
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* Serializeable传递对象的方法
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*/
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private void SerializeMethod(){
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Person mPerson = new Person();
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mPerson.setName("andy");
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mPerson.setAge(26);
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Intent mIntent = new Intent(this,SerializableDemo.class);
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Bundle mBundle = new Bundle();
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mBundle.putSerializable(SER_KEY,mPerson);
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mIntent.putExtras(mBundle);
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startActivity(mIntent);
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}
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/**
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* Pacelable传递对象方法
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*/
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private void PacelableMethod(){
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Police mPolice = new Police();
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mPolice.setName("I am Police");
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mPolice.setWorkTime(2008);
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Intent mIntent = new Intent(this,ParcelableDemo.class);
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Bundle mBundle = new Bundle();
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mBundle.putParcelable(PAR_KEY, mPolice);
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mIntent.putExtras(mBundle);
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startActivity(mIntent);
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}
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}
SerializableDemo.java类
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package com.andy.testdemo;
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import com.andy.entity.Person;
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import android.app.Activity;
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import android.os.Bundle;
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import android.widget.TextView;
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public class SerializableDemo extends Activity {
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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TextView mTextView = new TextView(this);
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Person mPerson = (Person)getIntent().getSerializableExtra(TestActivity.SER_KEY);
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mTextView.setText("You name is: " + mPerson.getName() + "/n"+
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"You age is: " + mPerson.getAge());
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setContentView(mTextView);
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}
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}
ParcelableDemo.java类:
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package com.andy.testdemo;
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import com.andy.entity.Police;
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import android.app.Activity;
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import android.os.Bundle;
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import android.widget.TextView;
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public class ParcelableDemo extends Activity {
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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TextView mTextView = new TextView(this);
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Police mPolice = (Police)getIntent().getParcelableExtra(TestActivity.PAR_KEY);
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mTextView.setText("Police name is: " + mPolice.getName()+"/n"+
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"WorkTime is: " + mPolice.getWorkTime() + "/n");
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setContentView(mTextView);
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}
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}
5.在AndroidManifest.xml文件中为新添加的两个Activity进行注册。
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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.andy.testdemo"
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android:versionCode="1"
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android:versionName="1.0">
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<application android:icon="@drawable/icon" android:label="@string/app_name">
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<activity android:name=".TestActivity"
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android:label="@string/app_name">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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<activity android:name=".SerializableDemo"/>
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<activity android:name=".ParcelableDemo"/>
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</application>
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<uses-sdk android:minSdkVersion="8" />
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</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。