Android笔记之Intent传递自定义对象

1、

import java.util.List;
import android.os.Parcel;
import android.os.Parcelable;

/**
* 1）writeToParcel 方法。该方法将类的数据写入外部提供的Parcel中。
* 2）describeContents方法。直接返回0就可以。
* 3）静态的Parcelable.Creator<T>接口，本接口有两个方法：
* createFromParcel(Parcel in) 实现从in中创建出类的实例的功能。
* newArray(int size) 创建一个类型为T，长度为size的数组， returnnew T[size];即可。本方法是供外部类反序列化本类数组使用。
*
* @author JL
*/
public class ViewPoint implements Parcelable {

private String v_name;

private List<String> v_picture;
/**
* 这一步read的顺序要和writeToParcel的顺序保持一致
* @param parcel
*/
private ViewPoint(Parcel parcel) {
// TODO Auto-generated constructor stub
v_name=parcel.readString();
v_description=parcel.readArrayList(List.class.getClassLoader());
//List<String> :parcel.readArrayList(List.class.getClassLoader())
//Map<String, String> :parcel.readHashMap(Map.class.getClassLoader())
//List<School> :parcel.readArrayList(School.class.getClassLoader())
//School :(School) parcel.readParcelable(School.class.getClassLoader())
}
public ViewPoint() {
// TODO Auto-generated constructor stub
}
public static final Parcelable.Creator<ViewPoint> CREATOR=new Parcelable.Creator<ViewPoint>() {

@Override
public ViewPoint createFromParcel(Parcel source) {
// TODO Auto-generated method stub
return new ViewPoint(source);
}

@Override
public ViewPoint[] newArray(int size) {
// TODO Auto-generated method stub
return new ViewPoint[size];
}
};

public String getV_name() {
return v_name;
}
public void setV_name(String v_name) {
this.v_name = v_name;
}
public List<String> getV_picture() {
return v_picture;
}
public void setV_picture(List<String> v_picture) {
this.v_picture = v_picture;
}
public List<String> getV_description() {
return v_description;
}
public void setV_description(List<String> v_description) {
this.v_description = v_description;
}
@Override
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}

@Override
public void writeToParcel(Parcel dest, int flags) {
// TODO Auto-generated method stub
//向Parcel对象写入要序列化的数据
//List一律写成 :writeList
//School :writeParcelable(schoolInfo, arg1),且School本身是Parcelable对象
dest.writeString(v_name);
dest.writeList(v_description);
}
}

byte, double, float, int, long和上面的String类似，套用即可。以下为特殊的几种类型：

Date

dest.writeLong(startDate.getTime());

startDate=new Date(source.readLong());

布尔类型

dest.writeByte((byte) (isLike ? 1 : 0));
isLike = source.readByte() != 0;

parcel类型(School是parcel类型)

dest.writeParcelable(school, PARCELABLE_WRITE_RETURN_VALUE);
school=(School) parcel.readParcelable(School.class.getClassLoader())

List<E>s所有类型的List的同统一写法

Done