android 用Parcelable传递复杂数据类型

//主界面布局只有一个button，用来跳转到另外一个activity
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/sendobj"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/sendobj" />

</RelativeLayout>

//接收复杂数据类型的activity的布局文件，这里主要是接收一个Bitmap对象
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
 
    <ImageView
        android:id="@+id/imgview"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:contentDescription="@string/hello_world"
        android:paddingLeft="10dp"
        android:paddingRight="10dp" />
 
    <TextView
        android:id="@+id/txtview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/imgview"
        android:paddingBottom="10dp"
        android:textColor="#CC0033"
        android:textSize="16dp" />
</RelativeLayout>

//创建一个bean类
package com.example.passobjdemo;
import android.graphics.Bitmap;
public class ObjBean {
	
	private int id;
	private String name;
	private double price;
	private Bitmap bitmap;
	
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public double getPrice() {
		return price;
	}
	public void setPrice(double price) {
		this.price = price;
	}
	public Bitmap getBitmap() {
		return bitmap;
	}
	public void setBitmap(Bitmap bitmap) {
		this.bitmap = bitmap;
	}
	public String toString() {
		return "id=" + id + ", name=" + name + ", price=" + price;
	}
}

package com.example.passobjdemo;

import android.graphics.Bitmap;
import android.os.Parcel;
import android.os.Parcelable;

/*
 *  Android传递复杂类型，Activity之间传递数据是通过Intent实现的。
 *  Android序列化对象主要有两种方法，实现Serializable接口、或者实现Parcelable接口。
 *  Parcelable是Android API特有的接口，效率比Serializable高，推荐用这种方法提高性能。
 *  Parcelable接口的作用：实现了Parcelable接口的实例可以将自身的状态信息写入Parcel，
 *  也可以从Parcel中恢复其状态。 Parcel用来完成数据的序列化传递。
 * */
public class ParcelableUtil implements Parcelable {
	
	private ObjBean objBean;
	
	public ObjBean getObjBean() {
		return objBean;
	}
	
	public ParcelableUtil(ObjBean objBean) {
		super();
		this.objBean = objBean;
	}
	
	private ParcelableUtil(Parcel in) {
		objBean = new ObjBean();
		objBean.setId(in.readInt());
		objBean.setName(in.readString());
		objBean.setPrice(in.readDouble());
		objBean.setBitmap((Bitmap) in.readParcelable(Bitmap.class.getClassLoader()));
	}

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

	/*
	 * 对象序列化在这里实现，
	 * 对每一个属性进行封装,写到流中
	 * 注意：在其他地方读或者设置值的时候，要跟这里写的顺序保持一致，否则读到的值可能为null
	 * */
	@Override
	public void writeToParcel(Parcel in, int flags) {
		in.writeInt(objBean.getId());
		in.writeString(objBean.getName());
		in.writeDouble(objBean.getPrice());
		in.writeParcelable(objBean.getBitmap(), PARCELABLE_WRITE_RETURN_VALUE);

	}

	/*
	 * API解释: Interface that must be implemented and provided as a public CREATOR field 
	 * that generates instances of your Parcelable class from a Parcel. 
	 * 
	 * 实际上用来对象的反序列化
	 * */
	public static final Parcelable.Creator<ParcelableUtil> CREATOR = 
			new Parcelable.Creator<ParcelableUtil>() {

				@Override
				public ParcelableUtil createFromParcel(Parcel source) {
					return new ParcelableUtil(source);
				}

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

package com.example.passobjdemo;

import java.io.InputStream;

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

public class MainActivity extends Activity implements OnClickListener{
	
	private Button sendobj;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		sendobj = (Button) findViewById(R.id.sendobj);
		sendobj.setOnClickListener(this);
	}

	@Override
	public void onClick(View v) {
		if (v.getId() == R.id.sendobj) {
			ObjBean bean = new ObjBean();
			bean.setId(1);
			bean.setName("Android smart Phone");
			bean.setPrice(999.99);
			
			InputStream is = getResources().openRawResource(R.raw.amz);
			Bitmap bit = BitmapFactory.decodeStream(is);
			bean.setBitmap(bit);
			
			ParcelableUtil pUtil = new ParcelableUtil(bean);
			
			Intent intent = new Intent(MainActivity.this, AnotherActivity.class);
			intent.putExtra("objbean", pUtil);//将ParcelableUtil对象put到intent中
			startActivity(intent);
		}
	}

}

package com.example.passobjdemo;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.TextView;

public class AnotherActivity extends Activity {
	
	private ImageView imgView;
	private TextView txtView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.another);
		imgView = (ImageView) findViewById(R.id.imgview);
		txtView = (TextView) findViewById(R.id.txtview);
		
		Intent intent = getIntent();
                //获取从mainactivity传过来的ParcelableUtil对象
		ParcelableUtil pu = (ParcelableUtil) intent.getParcelableExtra("objbean");
		ObjBean bean = pu.getObjBean();
		
                //显示值
		imgView.setImageBitmap(bean.getBitmap());
		txtView.setText(bean.getName() + "\n" + bean.getPrice());
		
	}


}