【转】Android中如何使用Bundle传递对象[使用Serializable或者Parcelable] -- 不错

时间：2023-01-03 13:34:56

原文网址：http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2012/1211/694.html

Android中Bundle类的作用

Bundle类用作携带数据，它类似于Map，用于存放key-value名值对形式的值。相对于Map，它提供了各种常用类型的putXxx()/getXxx()方法，如:putString()/getString()和putInt()/getInt()，putXxx()用于往Bundle对象放入数据，getXxx()方法用于从Bundle对象里获取数据。Bundle的内部实际上是使用了HashMap类型的变量来存放putXxx()方法放入的值。

用Bundle可以在Activity中传递基本数据类型，比如int、float、string等，但是现在的需求是如何在Activity中传递对象实例呢？就我目前所知的有两种，分别是java中Serializable和Android新引进的Parcelable方法。

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必须要实现Serializable接口，后面一种方法中的Object必须要实现Parcelable接口。如果没有实现这两个接口之一，那么我们可以使用Bundle.putSerializable(Key,Object)或者Bundle.putParcelable(Key, Object)，但起不到任何作用，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：

【转】Android中如何使用Bundle传递对象[使用Serializable或者Parcelable] -- 不错

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"?>
<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:

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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:

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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：

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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

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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：

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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。

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<?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>

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