14. Android Intent传递对象的两种方法

 

大家好，好久不见，今天要给大家讲一下Android Intent中如何传递对象，就我目前所知道的有两种方法：
一种是Bundle.putSerializable(Key,Object);
另一种是Bundle.putParcelable(Key, Object);

当然这些Object是有一定的条件的，前者是实现了Serializable接口，而后者是实现了Parcelable接口，为了让大家更容易理解我还是照常写了一个简单的Demo,大家就一步一步跟我来吧！

第一步：新建一个Android工程命名为ObjectTranDemo(类比较多哦)目录结构如下图：

第二步：修改main.xml布局文件(这里我增加了两个按钮)代码如下：

<? 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 = "Welcome to Mr wei's blog."
    />
< Button
    android:id = "@+id/button1"
    android:layout_width = "fill_parent"
    android:layout_height = "wrap_content"
    android:text = "Serializable"
/>
< Button
    android:id = "@+id/button2"
    android:layout_width = "fill_parent"
    android:layout_height = "wrap_content"
    android:text = "Parcelable"
/>
</ LinearLayout >

第三步：新建两个类一个是Person.java实现Serializable接口，另一个Book.java实现Parcelable接口，代码分别如下：

Person.java:

package com.tutor.objecttran;

import java.io.Serializable;

public class Person implements Serializable {
    private static final long serialVersionUID = -7060210544600464481L;
    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;
    }

}

Book.java:

package com.tutor.objecttran;

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

public class Book implements Parcelable {
    private String bookName;
    private String author;
    private int publishTime;

    public String getBookName() {
        return bookName;
    }

    public void setBookName(String bookName) {
        this .bookName = bookName;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this .author = author;
    }

    public int getPublishTime() {
        return publishTime;
    }

    public void setPublishTime( int publishTime) {
        this .publishTime = publishTime;
    }

    public static final Parcelable.Creator<book> CREATOR = new Creator<book>() {
        public Book createFromParcel(Parcel source) {
            Book mBook = new Book();
            mBook.bookName = source.readString();
            mBook.author = source.readString();
            mBook.publishTime = source.readInt();
            return mBook;
        }

        public Book[] newArray( int size) {
            return new Book[size];
        }
    };

    public int describeContents() {
        return 0 ;
    }

    public void writeToParcel(Parcel parcel, int flags) {
        parcel.writeString(bookName);
        parcel.writeString(author);
        parcel.writeInt(publishTime);
    }
}
</book></book>

第四步：修改ObjectTranDemo.java,并且新建两个Activity,一个是ObjectTranDemo1.java,别一个是ObjectTranDemo2.java.分别用来显示Person对像数据和Book对象数据，代码分别如下：

ObjectTranDemo.java:

package com.tutor.objecttran;

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

public class ObjectTranDemo extends Activity implements OnClickListener {

    private Button sButton, pButton;
    public final static String SER_KEY = "com.tutor.objecttran.ser" ;
    public final static String PAR_KEY = "com.tutor.objecttran.par" ;

    public void onCreate(Bundle savedInstanceState) {
        super .onCreate(savedInstanceState);
        setContentView(R.layout.main);
        setupViews();

    }

    // 我的一贯作风呵呵
    public void setupViews() {
        sButton = (Button) findViewById(R.id.button1);
        pButton = (Button) findViewById(R.id.button2);
        sButton.setOnClickListener( this );
        pButton.setOnClickListener( this );
    }

    // Serializeable<a title="传递对象" href="http://www.android-study.com/jichuzhishi/191.html">传递对象</a>的方法
    public void SerializeMethod() {
        Person mPerson = new Person();
        mPerson.setName( "frankie" );
        mPerson.setAge( 25 );
        Intent mIntent = new Intent( this , ObjectTranDemo1. class );
        Bundle mBundle = new Bundle();
        mBundle.putSerializable(SER_KEY, mPerson);
        mIntent.putExtras(mBundle);

        startActivity(mIntent);
    }

    // Pacelable<a title="传递对象" href="http://www.android-study.com/jichuzhishi/191.html">传递对象</a>方法
    public void PacelableMethod() {
        Book mBook = new Book();
        mBook.setBookName( "Android Tutor" );
        mBook.setAuthor( "Frankie" );
        mBook.setPublishTime( 2010 );
        Intent mIntent = new Intent( this , ObjectTranDemo2. class );
        Bundle mBundle = new Bundle();
        mBundle.putParcelable(PAR_KEY, mBook);
        mIntent.putExtras(mBundle);

        startActivity(mIntent);
    }

    // 铵钮点击事件响应
    public void onClick(View v) {
        if (v == sButton) {
            SerializeMethod();
        } else {
            PacelableMethod();
        }
    }
}

ObjectTranDemo1.java:

package com.tutor.objecttran;

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

public class ObjectTranDemo1 extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super .onCreate(savedInstanceState);

        TextView mTextView = new TextView( this );
        Person mPerson = (Person) getIntent().getSerializableExtra(
                ObjectTranDemo.SER_KEY);
        mTextView.setText( "You name is: " + mPerson.getName() + "/n"
                + "You age is: " + mPerson.getAge());

        setContentView(mTextView);
    }
}

ObjectTranDemo2.java:

package com.tutor.objecttran;

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

public class ObjectTranDemo2 extends Activity {

    public void onCreate(Bundle savedInstanceState) {
        super .onCreate(savedInstanceState);
        TextView mTextView = new TextView( this );
        Book mBook = (Book) getIntent().getParcelableExtra(
                ObjectTranDemo.PAR_KEY);
        mTextView.setText( "Book name is: " + mBook.getBookName() + "/n"
                + "Author is: " + mBook.getAuthor() + "/n" + "PublishTime is: "
                + mBook.getPublishTime());
        setContentView(mTextView);
    }
}

第五步：比较重要的一步啦，修改AndroidManifest.xml文件（将两个新增的Activity，ObjectTranDemo1,ObjectTranDemo2)申明一下代码如下(第14，15行):

<? xml version = "1.0" encoding = "utf-8" ?>
< manifest xmlns:android = "http://schemas.android.com/apk/res/android"
    package = "com.tutor.objecttran" android:versionCode = "1"
    android:versionName = "1.0" >
    < application android:icon = "@drawable/icon" android:label = "@string/app_name" >
        < activity android:name = ".ObjectTranDemo" 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 = ".ObjectTranDemo1" ></ activity >
        < activity android:name = ".ObjectTranDemo2" ></ activity >
    </ application >
    < uses-sdk android:minSdkVersion = "7" />
</ manifest >

第六步：运行上述工程查看效果图啦。

效果1：首界面

效果2：点击Serializable按钮

效果3：点击Parcelable按钮