Android 在自定义适配器和更新列表中插入新数据
我有一个带有自定义适配器的列表，刷新后，我想添加要显示的新数据（如果有） 但名单没有更新。我尝试了适配器的notifyDataSetChanged的所有方法，但没有更新 请帮忙。我在这件事上浪费了太多时间，我觉得这件事让我心烦意乱 代码如下： NewsFeedArrayAdapterAndroid 在自定义适配器和更新列表中插入新数据,android,listview,android-adapter,insert-update,Android,Listview,Android Adapter,Insert Update,我有一个带有自定义适配器的列表，刷新后，我想添加要显示的新数据（如果有） 但名单没有更新。我尝试了适配器的notifyDataSetChanged的所有方法，但没有更新 请帮忙。我在这件事上浪费了太多时间，我觉得这件事让我心烦意乱 代码如下： NewsFeedArrayAdapter public class NewsFeedArrayAdapter extends ArrayAdapter<FeedItem> { private final String TAG_D
public class NewsFeedArrayAdapter extends ArrayAdapter<FeedItem> {
private final String TAG_DEBUG = this.getClass().getName();
private LayoutInflater inflator;
public final static String PREFS_NAME = "shared_pref_eid";
ImageLoader imageLoader;
Utils utils;
public NewsFeedArrayAdapter(Activity context) {
super(context, R.layout.feed_story_content);
this.utils = new Utils(context);
inflator = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
imageLoader = ImageLoader.getInstance(context);
}
/**
* Static Inner class.
*
* Makes the ListView more efficient since Android recycles views in a ListView.
*/
public static class ViewHolder {
public ImageView profilePicture, image;
public TextView author, timePast, message, likes, comments;
public LinearLayout like, comment, share, likesCommentsCounter;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = null;
FeedItem feedItem = FeedItemParser.FEEDS.get(position);
ViewHolder holder = null;
if (convertView == null) {
rowView = inflator.inflate(R.layout.feed_story_content, parent, false);
holder = new ViewHolder();
holder.profilePicture = (ImageView) rowView.findViewById(R.id.feed_story_profile_picture);
holder.author = (TextView) rowView.findViewById(R.id.feed_story_author);
holder.timePast = (TextView) rowView.findViewById(R.id.feed_story_time_past);
holder.message = (TextView) rowView.findViewById(R.id.feed_story_message);
holder.image = (ImageView) rowView.findViewById(R.id.feed_story_image);
holder.like = (LinearLayout) rowView.findViewById(R.id.feed_feedback_like_container);
holder.comment = (LinearLayout) rowView.findViewById(R.id.feed_feedback_comment_container);
holder.share = (LinearLayout) rowView.findViewById(R.id.feed_feedback_share_container);
holder.likes = (TextView) rowView.findViewById(R.id.feed_story_likes);
holder.comments = (TextView) rowView.findViewById(R.id.feed_story_comments);
rowView.setTag(holder);
} else {
rowView = convertView;
holder = ((ViewHolder) rowView.getTag());
}
Log.i(TAG_DEBUG, "feedItem = " + feedItem);
if (feedItem != null) {
if (!TextUtils.isEmpty(feedItem.feed_story_from_name)) {
holder.author.setText(feedItem.feed_story_from_name);
} else {
holder.author.setText("Unknown");
}
if (!TextUtils.isEmpty(feedItem.feed_story_created_time)) {
// Convert the date to calendar date
Calendar calendarDate = null;
try {
calendarDate = ISO8601.toCalendar(feedItem.feed_story_created_time);
} catch (ParseException e) {
e.printStackTrace();
}
CharSequence relativeTimeSpan = DateUtils.getRelativeTimeSpanString(
calendarDate.getTimeInMillis(),
System.currentTimeMillis(),
DateUtils.SECOND_IN_MILLIS);
holder.timePast.setText(relativeTimeSpan);
} else {
holder.timePast.setText("Unknown");
}
Log.i(TAG_DEBUG, "feedItem.feed_story_message = " + feedItem.feed_story_message);
if (!TextUtils.isEmpty(feedItem.feed_story_message)) {
holder.message.setText(feedItem.feed_story_message);
} else {
holder.message.setText("Unkown");
// holder.message.setVisibility(View.GONE);
}
// Display the icon of the feed
int defaultResourceIcon = R.drawable.no_avatar;
if (feedItem.feed_story_from_id != null) {
String iconUrl = "https://graph.facebook.com/" + feedItem.feed_story_from_id + "/picture?type=normal";
if (Session.getActiveSession() != null &&
Session.getActiveSession().getAccessToken() != null) {
iconUrl += "&access_token=" + Session.getActiveSession().getAccessToken();
}
Log.i(TAG_DEBUG, "iconUrl = " + iconUrl);
imageLoader.displayImage(iconUrl, holder.profilePicture, 70, defaultResourceIcon);
} else {
imageLoader.cancelDisplayTaskFor(holder.profilePicture);
holder.profilePicture.setImageResource(defaultResourceIcon);
}
// Display the picture of the feed
int defaultResourcePicture = R.drawable.empty;
if (!TextUtils.isEmpty(feedItem.feed_story_picture)) {
holder.image.setVisibility(View.VISIBLE);
Log.i(TAG_DEBUG, "feed_picture = " + feedItem.feed_story_picture + "\nfeed_picture_height = " + feedItem.feed_story_picture_height);
imageLoader.displayImage(feedItem.feed_story_picture, holder.image, -1, defaultResourcePicture);
} else {
imageLoader.cancelDisplayTaskFor(holder.image);
// holder.image.setImageResource(defaultResourcePicture);
holder.image.setVisibility(View.GONE);
}
if (!TextUtils.isEmpty(feedItem.feed_story_likes)) {
holder.likes.setVisibility(View.VISIBLE);
String likes = feedItem.feed_story_likes + " like";
if (!feedItem.feed_story_likes.contentEquals("1")) {
likes += "s";
}
holder.likes.setText(likes);
} else {
holder.likes.setVisibility(View.GONE);
}
if (!TextUtils.isEmpty(feedItem.feed_story_comments)) {
holder.comments.setVisibility(View.VISIBLE);
String comments = feedItem.feed_story_comments + " comment";
if (!feedItem.feed_story_comments.contentEquals("1")) {
comments += "s";
}
holder.comments.setText(comments);
} else {
holder.comments.setVisibility(View.GONE);
}
holder.like.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
utils.customToast("Like content - TBA");
}
});
holder.comment.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
utils.customToast("Comment section - TBA");
}
});
holder.share.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
utils.customToast("Sharing content - TBA");
}
});
}
return rowView;
}
@Override
public int getCount() {
return FeedItemParser.FEEDS.size();
}
}
public class FeedItemParser {
// JSON Node names
public static final String
TAG_DATA = "data", // Array
TAG_ID = "id", // String
TAG_FROM = "from", // Object
TAG_FROM_ID = "id", // String
TAG_FROM_CATEGORY = "category", // String
TAG_FROM_NAME = "name", // String
TAG_TO = "to", // Object
TAG_TO_DATA = "data", // Array
TAG_TO_DATA_ID = "id", // String
TAG_TO_DATA_NAME = "name", // String
TAG_MESSAGE = "message", // String
TAG_PICTURE = "picture", // String
TAG_ACTIONS = "actions", // Array
TAG_ACTIONS_NAME = "name", // String
TAG_ACTIONS_LINK = "link", // String
TAG_PRIVACY = "privacy", // Object
TAG_PRIVACY_VALUE = "value", // String
TAG_TYPE = "type", // String
TAG_STATUS_TYPE = "status_type", // String
TAG_CREATED_TIME = "created_time", // String
TAG_UPDATED_TIME = "updated_time", // String
TAG_LIKES = "likes", // Object
TAG_LIKES_COUNT = "count", // String
TAG_COMMENTS = "comments", // Object
TAG_COMMENTS_DATA = "data", // Array
TAG_PAGING = "paging", // Object
TAG_PAGING_PREVIOUS = "previous",// String
TAG_PAGING_NEXT = "next"; // String
/**
* An array of Shelter items.
*/
public static List<FeedItem> FEEDS = new ArrayList<FeedItem>();
/**
* A map of Array items, by ID.
*/
public static Map<String, FeedItem> FEED_MAP = new HashMap<String, FeedItem>();
public static void addItem(FeedItem item) {
FEEDS.add(FEEDS.size(), item);
FEED_MAP.put(item.feed_story_id, item);
}
public static void addPicture (String feed_story_id, String picture, String height) {
FeedItem feedItem = FEED_MAP.get(feed_story_id);
feedItem.feed_story_picture = picture;
feedItem.feed_story_picture_height = height;
}
public static class FeedItem {
public String feed_story_id, feed_story_from_id, feed_story_from_category,
feed_story_from_name, feed_story_message, feed_story_picture, feed_story_picture_height,
feed_story_privacy, feed_story_type, feed_story_status_type, feed_story_created_time,
feed_story_updated_time, feed_story_likes, feed_story_comments;
/**
* @param feed_story_id
* @param feed_story_from_id
* @param feed_story_from_category
* @param feed_story_from_name
* @param feed_story_message
* @param feed_story_picture
* @param feed_story_privacy
* @param feed_story_type
* @param feed_story_status_type
* @param feed_story_created_time
* @param feed_story_updated_time
*/
public FeedItem(String feed_story_id, String feed_story_from_id, String feed_story_from_category,
String feed_story_from_name, String feed_story_message, String feed_story_picture,
String feed_story_picture_height, String feed_story_privacy, String feed_story_type,
String feed_story_status_type, String feed_story_created_time, String feed_story_updated_time,
String feed_story_likes, String feed_story_comments) {
this.feed_story_id = feed_story_id;
this.feed_story_from_id = feed_story_from_id;
this.feed_story_from_category = feed_story_from_category;
this.feed_story_from_name = feed_story_from_name;
this.feed_story_message = feed_story_message;
this.feed_story_picture = feed_story_picture;
this.feed_story_picture_height = feed_story_picture_height;
this.feed_story_privacy = feed_story_privacy;
this.feed_story_type = feed_story_type;
this.feed_story_status_type = feed_story_status_type;
this.feed_story_created_time = feed_story_created_time;
this.feed_story_updated_time = feed_story_updated_time;
this.feed_story_likes = feed_story_likes;
this.feed_story_comments = feed_story_comments;
}
@Override
public String toString() {
return feed_story_message;
}
}
}
ListView actualListView = mPullRefreshListView.getRefreshableView();
// Need to use the Actual ListView when registering for Context Menu
registerForContextMenu(actualListView);
// Sort the list before displaying
Collections.sort(FeedItemParser.FEEDS, Comparators.CREATED_TIME);
// Notify list adapter to update the list
customAddapter.notifyDataSetChanged();
notifyDataSetChanged（）再次感谢@Selvin.能否显示将此新项目添加到
customAddapter.FilteredModeLiteMarray的位置？我只是第一次设置适配器。。。当我调用customAddapter.notifyDataSetChanged（）时
是否应该更新列表？customAddapter.FilteredModeLiteMarray
用于“馈送”getView。。。它是您阵列的副本notifyDataSetChanged
只告诉适配器：调用getCount（）
，最终再次调用getView（…）
查看可见项。。。因此，如果不更改FilteredModeLiteMarray，则不会有任何更改…如果调用setAdapter，则不需要notifyDataSetChanged。。。您还可以添加一些方法来修改NewsFeedArrayAdapter中的FilteredModeLiteMarray。。。您也可以不将数组存储在NewsFeedArrayAdapter中，因为基类在内部已经有存储（您可以通过调用ArrayAdapter.getItem（pos）（在getView中使用您自己的数组/arraylist进行fx），并使用ArrayAdapter.add/addAll/clear/remove进行修改）这是否有效？对但将数据存储在某个全局变量中，然后在类实例中使用它，这对我来说并不是一个好的做法。。。无论如何，请记住覆盖适配器实现的getCount以返回提要数组中的项目计数。。。接下来，您可以从BaseAdapter继承您的适配器，因为ArrayAdapter在这种实现中对您没有附加值。。。或者如我所说，您可以使用feedItem=getItem（position）并且不要覆盖getCount，也不要将自己的列表存储在NewsFeedArrayAdapter中
FeedItemParser.addItem(new FeedItem(
id,
from_id,
from_category,
from_name,
message,
null, // Will be gotten through another request
null,
privacy_value,
type,
status_type,
created_time,
updated_time,
likes,
comments));
ListView actualListView = mPullRefreshListView.getRefreshableView();
// Need to use the Actual ListView when registering for Context Menu
registerForContextMenu(actualListView);
// Sort the list before displaying
Collections.sort(FeedItemParser.FEEDS, Comparators.CREATED_TIME);
// Notify list adapter to update the list
customAddapter.notifyDataSetChanged();