之前在写一个android一个小项目时，遇到一个问题，当一个实体类中持有一个Bitmap类的对象时，并且该实体类需要进行网络传输时，仅仅实现Serializable会抛出一个异常： 

android.os.BadParcelableException: Parcelable protocol requires a Parcelable.Creator object called  CREATOR on class com.txrj.sms.model.TxrjContact      

这个异常了之后才知道，Bitmap是android 中的类，默认该类是实现了Parcelable的，并且这个接口不同于java中提供的Serializable。

Serializable，即串行化，或序列化，这是一个标记接口，其作用是将数据对象写入字节流中，必要时可从字节流取出对象，这就是对象的序列化，可用于将数据存储到外存中或者用于网络传输。而android中则提供了Parcelable这个接口，该接口并不像Serializable那样是个标记接口，Parcelable需要实现方法以实现数据能够高效地传输。实现该接口的类的对象可以存储到Parcel中或写入到Parcel中，由于android的系统资源有限，提供Parcelable接口就是为了提高性能，Parcelable接口比Serializable接口性能更高。

下面是实现Parcelable的接口的方法：

package cn.edu.aust.enjoychat.entity;import java.io.Serializable;import java.util.Date;import android.graphics.Bitmap;import android.os.Parcel;import android.os.Parcelable;public class ContactItem implements Parcelable,Serializable{	private static final long serialVersionUID = 1L; 	// 用户名	private String contactName = "";	// 用户头像图片类型	private String iconType = "jpg";		// 用户头像的图片存储问题	private Bitmap image;		// 出生日期	private String birthday;		// 昵称	private String nickname = "";	// 性别	private String gender = "";	// 地址	private String address = "";	// 所在地区	private String areaLocation = "";	// 个性签名	private String signature = "";	// 邮箱	private String emial = "";	//联系人拥有者名称	private String ownerName;		//联系人经纬度信息	private Position position;		public String getOwnerName() {		return ownerName;	}	public Position getPosition() {		return position;	}	public void setPosition(Position position) {		this.position = position;	}	public void setOwnerName(String ownerName) {		this.ownerName = ownerName;	}	public String getContactName() {		return contactName;	}	public void setContactName(String contactName) {		this.contactName = contactName;	}	public String getIconType() {		return iconType;	}	public void setIconType(String iconType) {		this.iconType = iconType;	}	public Bitmap getImage() {		return image;	}	public void setImage(Bitmap image) {		this.image = image;	}	public String getBirthday() {		return birthday;	}	public void setBirthday(String birthday) {		this.birthday = birthday;	}	public String getNickname() {		return nickname;	}	public void setNickname(String nickname) {		this.nickname = nickname;	}	public String getGender() {		return gender;	}	public void setGender(String gender) {		this.gender = gender;	}	public String getAddress() {		return address;	}	public void setAddress(String address) {		this.address = address;	}	public String getAreaLocation() {		return areaLocation;	}	public void setAreaLocation(String areaLocation) {		this.areaLocation = areaLocation;	}	public String getSignature() {		return signature;	}	public void setSignature(String signature) {		this.signature = signature;	}	public String getEmial() {		return emial;	}	public void setEmial(String emial) {		this.emial = emial;	}		 public static final Parcelable.Creator
     
       CREATOR = new Creator
      
       () {          public ContactItem createFromParcel(Parcel source) {         	 ContactItem item = new ContactItem();         	 item.contactName = source.readString();        	 item.iconType = source.readString();        	 item.image = Bitmap.CREATOR.createFromParcel(source);        	 item.birthday = source.readString();        	 item.nickname = source.readString();        	 item.gender = source.readString();        	 item.address = source.readString();        	 item.areaLocation = source.readString();        	 item.signature = source.readString();        	 item.emial = source.readString();             return item;          }          public ContactItem[] newArray(int size) {              return new ContactItem[size];          }      };      @Override	public int describeContents() {		return 0;	}	@Override	public void writeToParcel(Parcel dest, int flags) {		dest.writeString(contactName);		dest.writeString(iconType);		image.writeToParcel(dest, 0);		dest.writeString(birthday);		dest.writeString(nickname);		dest.writeString(gender);		dest.writeString(address);		dest.writeString(areaLocation);		dest.writeString(signature);		dest.writeString(emial);	}	}