我有ListView，每个List项目底部都有一个Like按钮。滚动时我无法保存按钮的状态。当我向上或向下滚动时，按钮的状态会重置。我想我需要添加一个pojo类来获取和设置按钮的状态但我不知道如何做到所以任何人都可以帮助我的代码？
我的适配器类：
public class FeedListAdapter extends BaseAdapter {
private Activity activity;
private int lastPosition = -1;
private DatabaseHandler db;
int id = 0;
String email;
private List<FeedItem> feedItems;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();
public FeedListAdapter(Activity activity, List<FeedItem> feedItems) {
this.activity = activity;
this.feedItems = feedItems;
}
@Override
public int getViewTypeCount() {
if (getCount() != 0)
return getCount();
return 1;
}
@Override
public int getCount() {
return feedItems.size();
}
@Override
public Object getItem(int location) {
return feedItems.get(location);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, final ViewGroup parent) {
final ViewHolder holder;
final FeedItem item = feedItems.get(position);
if (convertView == null){
LayoutInflater inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.feed_item, parent,false);
holder = new ViewHolder();
//Getting Views from Layout
holder.likebutton =
(LikeButton) convertView.findViewById(R.id.star_button);
holder.name = (TextView) convertView.findViewById(R.id.name);
holder.timestamp = (TextView) convertView
.findViewById(R.id.timestamp);
holder.statusMsg = (TextView) convertView
.findViewById(R.id.txtStatusMsg);
holder.url = (TextView) convertView.findViewById(R.id.txtUrl);
holder.like = (TextView) convertView.findViewById(R.id.like_box_no);
holder.share = (TextView) convertView.findViewById(R.id.share_no);
holder.comment = (TextView) convertView.findViewById(R.id.comment_no);
holder.profilePic = (NetworkImageView) convertView
.findViewById(R.id.profilePic);
holder.feedImageView = (FeedImageView) convertView
.findViewById(R.id.feedImage1);
//End Getting Views from Layout
convertView.setTag(holder);
}
else{
holder = (ViewHolder)convertView.getTag();
}
if (imageLoader == null)
imageLoader = AppController.getInstance().getImageLoader();
//get User Email
db = new DatabaseHandler(activity.getApplication());
HashMap<String, String> user = db.getUserDetails();
email = user.get("email").toString();
// End get User Email ID for sending it to db
holder.name.setText(item.getName());
// Converting timestamp into x ago format
CharSequence timeAgo = DateUtils.getRelativeTimeSpanString(
Long.parseLong(item.getTimeStamp()),
System.currentTimeMillis(), DateUtils.SECOND_IN_MILLIS);
holder.timestamp.setText(timeAgo);
if (item.getFav().equals("1")) {
holder.likebutton.setLiked(true);
} else {
// status is empty, remove from view
holder.likebutton.setLiked(false);
}
// Check for empty status message
if (!TextUtils.isEmpty(item.getStatus())) {
holder.statusMsg.setText(item.getStatus());
holder.statusMsg.setVisibility(View.VISIBLE);
} else {
// status is empty, remove from view
holder.statusMsg.setVisibility(View.GONE);
}
// Chcek for empty Like
if (!TextUtils.isEmpty(item.getLike())) {
holder.like.setText(item.getLike());
holder.like.setVisibility(View.VISIBLE);
} else {
// status is empty, remove from view
holder.like.setText("0");
}
// Chcek for empty Comment
if (!TextUtils.isEmpty(item.getComment())) {
holder.comment.setText(item.getComment());
holder.comment.setVisibility(View.VISIBLE);
} else {
// status is empty, remove from view
holder.comment.setText("0");
}
// Check for empty Share
if (!TextUtils.isEmpty(item.getShare())) {
holder.share.setText(item.getShare());
holder.share.setVisibility(View.VISIBLE);
} else {
// status is empty, remove from view
holder.share.setText("0");
}
// Checking for null feed url
if (item.getUrl() != null) {
holder.url.setText(Html.fromHtml("<a href=\"" + item.getUrl() + "\">"
+ item.getUrl() + "</a> "));
// Making url clickable
holder.url.setMovementMethod(LinkMovementMethod.getInstance());
holder.url.setVisibility(View.VISIBLE);
} else {
// url is null, remove from the view
holder.url.setVisibility(View.GONE);
}
// user profile pic
holder.profilePic.setImageUrl(item.getProfilePic(), imageLoader);
//Setting preloading Image to profile pic
imageLoader.get(item.getProfilePic(), ImageLoader.getImageListener(holder.profilePic, R.drawable._businessman, R.drawable._businessman));
// Feed image
if (item.getImge() != null) {
holder.feedImageView.setImageUrl(item.getImge(), imageLoader);
holder.feedImageView.setVisibility(View.VISIBLE);
holder.feedImageView
.setResponseObserver(new FeedImageView.ResponseObserver() {
@Override
public void onError() {
}
@Override
public void onSuccess() {
}
});
} else {
holder.feedImageView.setVisibility(View.GONE);
}
//Animating the List View
Animation animation = AnimationUtils.loadAnimation(activity.getApplication(), (position > lastPosition) ? R.anim.up_from_bottom : R.anim.down_from_top);
convertView.startAnimation(animation);
lastPosition = position;
//End Animating the List View
//onClick Like Button
//Toast.makeText(activity.getApplication(), "Fav Changed : " + item.getId(), Toast.LENGTH_SHORT).show();
//if Favourite Clicked Do this
holder.likebutton.setOnLikeListener(new OnLikeListener() {
@Override
public void liked(LikeButton likeButton) {
id = item.getId();
Log.d("inFavChngeListner", "Clickd" + item.getId());
new send_json().execute();
likeButton.setLiked(true);
}
@Override
public void unLiked(LikeButton likeButton) {
new send_json_unlike().execute();
likeButton.setLiked(false);
}
});
return convertView;
}
public static class ViewHolder {
public LikeButton likebutton;
public TextView name;
public TextView timestamp;
public TextView statusMsg;
public TextView like;
public TextView share;
public TextView comment;
public TextView url;
public NetworkImageView profilePic;
public FeedImageView feedImageView;
}
//Sending Likes with email id and feed id to Remote Mysql Db
public class send_json extends AsyncTask<String, String, JSONObject> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected JSONObject doInBackground(String... params) {
UserFunctions userFunction = new UserFunctions();
JSONObject json = userFunction.like_func(email, String.valueOf(id));
Log.d("BG Like, Email:" + email + "Id: " + String.valueOf(id), json.toString());
return json;
}
@Override
protected void onPostExecute(JSONObject jsonObject) {
super.onPostExecute(jsonObject);
}
}
//Sending UnLike Request with email id and feed id to Remote Mysql Db
public class send_json_unlike extends AsyncTask<String, String, JSONObject> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected JSONObject doInBackground(String... params) {
UserFunctions userFunction = new UserFunctions();
JSONObject json = userFunction.unlike_func(email, String.valueOf(id));
Log.d("BG UnLike, Email:" + email + "Id: " + String.valueOf(id), json.toString());
return json;
}
}
}
我的片段：
public class MainFragment extends Fragment implements SwipeRefreshLayout.OnRefreshListener{
private static final String TAG = MainFragment.class.getSimpleName();
private ListView listView;
private FeedListAdapter listAdapter;
private List<FeedItem> feedItems;
View view;
private CircleRefreshLayout mRefreshLayout;
private boolean count=false;
JSONObject feedObj;
FeedItem item;
public MainFragment() {
}
public static MainFragment newInstance(String text) {
MainFragment fragment = new MainFragment();
Bundle bundle = new Bundle();
fragment.setArguments(bundle);
return fragment;
}
@Override
public void registerForContextMenu(View view) {
super.registerForContextMenu(view);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.activity_main, container, false);
mRefreshLayout = (CircleRefreshLayout) view.findViewById(R.id.refresh_layout);
listView = (ListView) view.findViewById(R.id.list);
feedItems = new ArrayList<FeedItem>();
listAdapter = new FeedListAdapter(getActivity(), feedItems);
view.setFocusableInTouchMode(true);
view.requestFocus();
//Listeneing to Back Button
view.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
getActivity().finish();
Toast.makeText(getActivity(), "Back Pressed", Toast.LENGTH_SHORT).show();
return true;
}
}
return false;
}
});
//Starting start Loader Animation Thread and fetching the feed
mRefreshLayout.post(new Runnable() {
@Override
public void run() {
startAnim();
count=true;
fetch();
}
});
mRefreshLayout.setOnRefreshListener(
new CircleRefreshLayout.OnCircleRefreshListener() {
@Override
public void refreshing() {
// do something when refresh starts
count = true;
fetch();
}
@Override
public void completeRefresh() {
// do something when refresh complete
}
});
listView.setAdapter(listAdapter);
return view;
}
private void fetch()
{
// making fresh volley request and getting json
JsonObjectRequest jsonReq = new JsonObjectRequest(Request.Method.GET,
URL_FEED, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
VolleyLog.d(TAG, "Response: " + response.toString());
if (response != null) {
feedItems.clear();
parseJsonFeed(response);
}
if (count){
stopAnim();
mRefreshLayout.finishRefreshing();
count=false;
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
}
});
// Adding request to volley request queue
AppController.getInstance().addToRequestQueue(jsonReq);
}
/**
* Parsing json reponse and passing the data to feed view list adapter
* */
private void parseJsonFeed(JSONObject response) {
try {
JSONArray feedArray = response.getJSONArray("feed");
for (int i = 0; i < feedArray.length(); i++) {
feedObj = (JSONObject) feedArray.get(i);
item = new FeedItem();
item.setId(feedObj.getInt("id"));
item.setName(feedObj.getString("name"));
// Image might be null sometimes
String image = feedObj.isNull("image") ? null : feedObj
.getString("image");
item.setImge(image);
item.setStatus(feedObj.getString("status"));
item.setProfilePic(feedObj.getString("profilePic"));
item.setTimeStamp(feedObj.getString("timeStamp"));
// url might be null sometimes
String feedUrl = feedObj.isNull("url") ? null : feedObj
.getString("url");
item.setUrl(feedUrl);
item.setLike(feedObj.getString("like"));
item.setComment(feedObj.getString("comment"));
item.setShare(feedObj.getString("share"));
item.setFav(feedObj.getString("fav"));
feedItems.add(item);
}
// notify data changes to list adapater
listAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
public void onRefresh() {
}
//start Animation on Start
void startAnim(){
view.findViewById(R.id.avloadingIndicatorView).setVisibility(View.VISIBLE);
}
//stop Animation on start
void stopAnim(){
view.findViewById(R.id.avloadingIndicatorView).setVisibility(View.GONE);
}
}
答案 0 :(得分：1)
您只需获取一次数据并在“FeedItems”中添加这些项目。然后在＆＃39; userFunction.like_func＆＃39;您喜欢还是不喜欢使用“userFunction.unlike_func”＆＃39;我们不知道他们做了什么，但可能他们没有更新“feedItems＆＃39;收集，并准确地不打电话＆＃39; setFav＆＃39;在点击的项目上。这就是喜欢没有更新的原因。你可以：
1）更新（调用setFav）异步任务中的必填字段，甚至更好地为这些字段创建截击请求。
2）在＆＃39; holder.likebutton.setOnLikeListener（new OnLikeListener（）{＆＃39;
添加：
item.setFav（＆＃34; 1＆＃34;）或item.setFav（＆＃34; 0＆＃34;）
holder.likebutton.setOnLikeListener(new OnLikeListener() {
@Override
public void liked(LikeButton likeButton) {
id = item.getId();
Log.d("inFavChngeListner", "Clickd" + item.getId());
new send_json().execute();
likeButton.setLiked(true);
item.setFav("1")
}
@Override
public void unLiked(LikeButton likeButton) {
new send_json_unlike().execute();
likeButton.setLiked(false);
item.setFav("0")
}
});