[英]Pass List with custom object to another activity android
我有一個List<News> new ArrayList<News>();
我需要將此列表傳遞給另一個活動,並從中檢索對象以將其分配給String值。
News.java
public class News
{
String title;
String description;
String thumbnail;
String newsUrl;
String body;
String newsBigImage ;
String newsComments ;
String newsViews;
String publishedDate;
String articleGuid;
String newsSourceId;
String newsId ;
String publisherName;
String newsSourceTitle;
String color;
News(String title, String description, String thumbnail, String newsUrl, String body, String newsBigImage, String newsComments, String newsViews,
String publishedDate,
String articleGuid,
String newsSourceId,
String newsId ,
String publisherName,
String newsSourceTitle )
{
this.title = title;
this.description = description;
this.articleGuid =articleGuid;
this.thumbnail = thumbnail;
this.newsUrl = newsUrl;
this.body = body;
this.newsBigImage = newsBigImage;
this.newsComments = newsComments;
this.newsViews = newsViews;
this.publishedDate = publishedDate;
this.newsId = newsId;
this.newsSourceId = newsSourceId;
this.publisherName = publisherName;
//this.color = color;
this.newsSourceTitle =newsSourceTitle;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getThumbnail() {
return thumbnail;
}
public void setThumbnail(String thumbnail) {
this.thumbnail = thumbnail;
}
public String getNewsUrl() {
return newsUrl;
}
public void setNewsUrl(String newsUrl) {
this.newsUrl = newsUrl;
}
public String getBody() {
return body;
}
public void setBody(String body) {
this.body = body;
}
public String getNewsBigImage() {
return newsBigImage;
}
public void setNewsBigImage(String newsBigImage) {
this.newsBigImage = newsBigImage;
}
public String getNewsComments() {
return newsComments;
}
public void setNewsComments(String newsComments) {
this.newsComments = newsComments;
}
public String getNewsViews() {
return newsViews;
}
public void setNewsViews(String newsViews) {
this.newsViews = newsViews;
}
public String getPublishedDate() {
return publishedDate;
}
public void setPublishedDate(String publishedDate) {
this.publishedDate = publishedDate;
}
public String getArticleGuid() {
return articleGuid;
}
public void setArticleGuid(String articleGuid) {
this.articleGuid = articleGuid;
}
public String getNewsSourceId() {
return newsSourceId;
}
public void setNewsSourceId(String newsSourceId) {
this.newsSourceId = newsSourceId;
}
public String getNewsId() {
return newsId;
}
public void setNewsId(String newsId) {
this.newsId = newsId;
}
public String getPublisherName() {
return publisherName;
}
public void setPublisherName(String publisherName) {
this.publisherName = publisherName;
}
public String getNewsSourceTitle() {
return newsSourceTitle;
}
public void setNewsSourceTitle(String newsSourceTitle) {
this.newsSourceTitle = newsSourceTitle;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
}
我傳遞像這樣的值:
myNewsList.add(new News(title, description, thumbnail, newsUrl, body, newsBigImage, newsComments, newsViews, publishedDate, articleGuid, newsSourceId, newsId, publisherName, newsSourceTitle));
然后,我將此列表傳遞給ListAdapter,以在ListView中顯示它。
itemsAdapter = new LazyAdapter(myContext, myNewsList);
newsList.setAdapter(itemsAdapter);
現在,當用戶單擊列表視圖項時,我想將myNewsList
傳遞給新活動,並從中檢索項目並將其分配給該類中的另一個Strings。
ewsList.setOnItemClickListener(new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> arg0,
View arg1, int position, long arg3)
{
// TODO Auto-generated method stub
myDialog = new ProgressDialog(myContext).show(getActivity(), "Fetching news..", "Just a moment");
//News myMap = myNewsList.get(position);
Intent newsIntent = new Intent(getActivity(),NewsDetails.class);
startActivity(newsIntent);
我怎樣才能做到這一點??
實現一個可拆分的接口,因此您的類看起來像
public class News implements Parcelable {
String title;
String description;
String thumbnail;
String newsUrl;
String body;
String newsBigImage ;
String newsComments ;
String newsViews;
String publishedDate;
String articleGuid;
String newsSourceId;
String newsId ;
String publisherName;
String newsSourceTitle;
String color;
protected News(Parcel in) {
title = in.readString();
description = in.readString();
thumbnail = in.readString();
newsUrl = in.readString();
body = in.readString();
newsBigImage = in.readString();
newsComments = in.readString();
newsViews = in.readString();
publishedDate = in.readString();
articleGuid = in.readString();
newsSourceId = in.readString();
newsId = in.readString();
publisherName = in.readString();
newsSourceTitle = in.readString();
color = in.readString();
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(title);
dest.writeString(description);
dest.writeString(thumbnail);
dest.writeString(newsUrl);
dest.writeString(body);
dest.writeString(newsBigImage);
dest.writeString(newsComments);
dest.writeString(newsViews);
dest.writeString(publishedDate);
dest.writeString(articleGuid);
dest.writeString(newsSourceId);
dest.writeString(newsId);
dest.writeString(publisherName);
dest.writeString(newsSourceTitle);
dest.writeString(color);
}
@SuppressWarnings("unused")
public static final Parcelable.Creator<News> CREATOR = new Parcelable.Creator<News>() {
@Override
public News createFromParcel(Parcel in) {
return new News(in);
}
@Override
public News[] newArray(int size) {
return new News[size];
}
};
}
現在,您可以通過此附加意圖
intent.putExtra("newsObject", obj);
為了傳遞arraylist,請執行Intent.putParcelableArrayListExtra("newsList", arr);
在下一個活動中
News news = (News)intent.getParcelableExtra("newsObject");
和獲取arraylist
ArrayList<News> news = (ArrayList<News>)intent.getParcelableArrayListExtra("newsList");
Seriazable
使用Seriazable
或Parceable
接口實現。
在NewsDetails類中,您只想顯示說明,因此調用模型類的getters方法並在那里顯示,否則請按照上述解決方案進行操作
首先,創建一個getter方法來獲取適配器中的對象。返回列表,然后在活動中調用getter,然后創建意圖。
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