Android的：如何实现Parcelable我的对象？ [英] Android: How to implement Parcelable to my objects?
问题描述
我有抓住我的JSON指标这个ConstantData类，我需要用额外活动之间传递它们。但在此之前，我要实现Parcelable这一类的对象第一。
我的问题是，我应该怎么我的类中声明的对象，在这里，并把每一个对象在变量中？
我是新手，我完全一无所知现在。谢谢。随意修改我的code以下。
ConstantData.java
公共类ConstantData {
公共静态字符串PROJECT_TITLE =项目名称;
公共静态字符串organization_title =组织称号;
公共静态字符串关键字=关键词;
公共静态字符串short_ code =短code;
公共静态字符串project_description =说明;
公共静态字符串smallImageUrl =smallImageUrl;
公共静态字符串bigImageUrl =bigImageUrl;
公共静态字符串价=价格;
公共静态字符串全国=国家;
公共静态的ArrayList＆LT;项目＆GT; projectsList =新的ArrayList＆LT;项目＆GT;（）;
公众诠释describeContents（）{
返回0;
}
公共无效writeToParcel（包裹出来，诠释标志）{
out.writeString（PROJECT_TITLE）;
out.writeString（organization_title）;
out.writeString（关键字）;
out.writeString（short_ code）;
out.writeString（project_description）;
out.writeString（smallImageUrl）;
out.writeString（bigImageUrl）;
out.writeString（价格）;
out.writeString（国家）;
}
公共静态最终Parcelable.Creator＆LT; ConstantData＆GT; CREATOR
=新Parcelable.Creator＆LT; ConstantData＆GT;（）{
公共ConstantData createFromParcel（包裹中）{
返回新ConstantData（中）;
}
公共ConstantData [] newArray（INT尺寸）{
返回新ConstantData【尺寸】;
}
};
私人ConstantData（包裹中）{
PROJECT_TITLE = in.readString（）;
organization_title = in.readString（）;
关键字= in.readString（）;
short_ code = in.readString（）;
project_description = in.readString（）;
smallImageUrl = in.readString（）;
bigImageUrl = in.readString（）;
价格= in.readString（）;
国家= in.readString（）;
}
}
在的情况下，我的问题是不够清楚，你可以看一下这个问题：<一href="http://stackoverflow.com/questions/2139134/how-to-send-an-object-from-one-android-activity-to-another-with-intent-putextra/2141166#2141166">How从一个Android的活动将对象到另一个Intent.putExtra？
在那里，他写了 myParcelableObject ，我只是不知道如何让parcelable对象。
修改 * Project.java 的*
公共类项目{
公共字符串PROJECT_TITLE;
公共字符串organization_title;
公共字符串关键字;
公共字符串short_ code;
公共字符串project_description;
公共字符串smallImageUrl;
公共字符串bigImageUrl;
公共字符串的价格;
公共字符串的国家;
}
您需要执行 Parcelable 接口
公共类ConstantData实现Parcelable {
公共无效writeToParcel（包裹出来，诠释标志）{
out.writeString（PROJECT_TITLE）;
....
out.writeString（国家）;
out.writeList（projectsList）; //＆LT;＆LT; -
}
私人ConstantData（包裹中）{
PROJECT_TITLE = in.readString（）;
....
国家= in.readString（）;
projectsList = in.readList（）;
我觉得对的 projectsList 工作，项目类还需要实现<$ C写作$ C> Parcelable 。
请参阅例如<一href="https://github.com/pilhuhn/ZwitscherA/blob/master/src/de/bsd/zwitscher/account/Account.java">this类一个例子。
I have this ConstantData class which holds my JSON indexes, I need to pass them between activities with extras. But before that, I have to implement Parcelable to the objects of this class first.
My question is, how should I declare the object within my class here and put every object inside a variable?
I'm a newbie and I'm totally clueless right now. Thank you. Feel free to modify my code below.
ConstantData.java
public class ConstantData{
public static String project_title = "project title";
public static String organization_title = "organization title";
public static String keyword = "keyword";
public static String short_code = "short code";
public static String project_description = "description";
public static String smallImageUrl = "smallImageUrl";
public static String bigImageUrl = "bigImageUrl";
public static String price= "price";
public static String country= "country";
public static ArrayList<Project> projectsList = new ArrayList<Project>();
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel out, int flags) {
out.writeString(project_title);
out.writeString(organization_title);
out.writeString(keyword);
out.writeString(short_code);
out.writeString(project_description);
out.writeString(smallImageUrl);
out.writeString(bigImageUrl);
out.writeString(price);
out.writeString(country);
}
public static final Parcelable.Creator<ConstantData> CREATOR
= new Parcelable.Creator<ConstantData>() {
public ConstantData createFromParcel(Parcel in) {
return new ConstantData(in);
}
public ConstantData[] newArray(int size) {
return new ConstantData[size];
}
};
private ConstantData(Parcel in) {
project_title = in.readString();
organization_title = in.readString();
keyword = in.readString();
short_code = in.readString();
project_description = in.readString();
smallImageUrl = in.readString();
bigImageUrl = in.readString();
price = in.readString();
country = in.readString();
}
}
In case my question is not clear enough, you can look up this question: How to send an object from one Android Activity to another with Intent.putExtra?
There he wrote myParcelableObject, I just don't know how to make the parcelable object.
EDIT *Project.java*
public class Project {
public String project_title;
public String organization_title;
public String keyword;
public String short_code;
public String project_description;
public String smallImageUrl;
public String bigImageUrl;
public String price;
public String country;
}
You need to implement the Parcelable interface
public class ConstantData implements Parcelable {
public void writeToParcel(Parcel out, int flags) {
out.writeString(project_title);
....
out.writeString(country);
out.writeList(projectsList); // <<--
}
private ConstantData(Parcel in) {
project_title = in.readString();
....
country = in.readString();
projectsList = in.readList();
I think for the writing of the projectsList to work, the Project class also needs to implement Parcelable.
See e.g. this class for an example.
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