您好我不知道是否提出正确的问题，但我想在Facebook上发表评论，更新评论和删除评论。
当我添加评论时，它会向服务器发送请求，它将给出带有新值的响应以填写listadapter，并且在点击输入或添加按钮后，我的列表视图中可能会显示该更改，并且在删除时它会向服务器和响应填充我的listAdapter。并且更改可能会出现在我的列表视图中而不刷新列表视图。我该如何执行此操作。
谢谢你。
这是我的班级。
public class CommmentActivity extends Activity{
DatabaseHandler db = new DatabaseHandler(this);
List<CommentListInfo> list_CommentInfo = new ArrayList<CommentListInfo>();
List<String> SuggetionList;
AutoCompleteTextView aCompletView;
EditText etComment;
String strComment;
ArrayAdapter<String> mentionList;
ListCommentAdapter commentAdapter;
ImageView IvAddComment;
ListView CommentList;
SessionCreator m_session;
boolean m = false;
boolean mBuzy;
int FirstPosition;
int ItemCounted;
int CurrentScrollState;
int TotalItemCount;
String UserId;
String VidoId;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.commentvideo_main);
SuggetionList = new ArrayList<String>();
String Curl = GlobalMethod.TokenGenerator() + "&action=getCommentsVideo";
Intent data = getIntent();
UserId = data.getStringExtra("userId");
VidoId = data.getStringExtra("videoId");
init();
String strfriendsSyncDate = m_session.getfriendsSyncDate();
Log.d("mData", strfriendsSyncDate);
new CommentsDetail().execute(UserId,VidoId,strfriendsSyncDate,Curl,"1");
commentAdapter = new ListCommentAdapter(getApplicationContext(), list_CommentInfo);
CommentList.setAdapter(commentAdapter);
CommentList.setOnScrollListener(new OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// TODO Auto-generated method stub
switch (scrollState) {
case OnScrollListener.SCROLL_STATE_IDLE:{
commentAdapter.notifyDataSetChanged();
//ManipulateVisibleView(view);
break;
}
case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
{
mBuzy = true;
break;
}
case OnScrollListener.SCROLL_STATE_FLING:{
mBuzy = true;
break;
}
default:
break;
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
// TODO Auto-generated method stub
FirstPosition = firstVisibleItem;
ItemCounted = visibleItemCount;
TotalItemCount = totalItemCount;
int LastPosition = view.getLastVisiblePosition();
Log.d("First Position", ""+FirstPosition);
Log.d("ItemCountes",""+ItemCounted);
Log.d("totalItemCount",""+TotalItemCount);
Log.d("LastPosition",""+LastPosition);
if(visibleItemCount!=0 && ((firstVisibleItem+visibleItemCount)>=(totalItemCount))){
Log.d("mCalled", "call");
}
isScrollCompleted();
}
});
IvAddComment.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
strComment = etComment.getText().toString();
etComment.getText().clear();
String strUrl = GlobalMethod.TokenGenerator() + "&action=addCommentsVideo";
new CommentsDetail().execute(UserId,VidoId,strComment,strUrl,"0");
commentAdapter.notifyDataSetChanged();
}
});
}
private void isScrollCompleted(){
if(this.ItemCounted >0 && this.CurrentScrollState == OnScrollListener.SCROLL_STATE_IDLE){
Log.d("ItemCounted",""+ItemCounted);
Log.d("CurrentScrollState",""+CurrentScrollState);
}
}
private void init() {
// TODO Auto-generated method stub
m_session = new SessionCreator(getApplicationContext());
etComment = (EditText)findViewById(R.id.etComments);
CommentList = (ListView)findViewById(R.id.lvLatestComments);
IvAddComment = (ImageView)findViewById(R.id.addComment);
}
public class CommentsDetail extends AsyncTask<String, String, String>{
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
ServiceHandler serviceClient;
String mJsonString;
try{
String userId = (String)params[0];
String vId = (String)params[1];
if(params[4].equals("0")){
String comment = (String)params[2];
String strUrl = (String)params[3];
List<NameValuePair> paramsNameValuePairs = new ArrayList<NameValuePair>();
paramsNameValuePairs.add(new BasicNameValuePair("userId", userId));
paramsNameValuePairs.add(new BasicNameValuePair("videoId", vId));
paramsNameValuePairs.add(new BasicNameValuePair("commentText", comment));
serviceClient = new ServiceHandler();
mJsonString = serviceClient.makeServiceCall(strUrl,
ServiceHandler.POST, paramsNameValuePairs);
Log.i("---->>>>>>>>>>", paramsNameValuePairs + "");
}else{
String syncdate = (String)params[2];
String strUrl = (String)params[3];
List<NameValuePair> paramsNameValuePairs = new ArrayList<NameValuePair>();
paramsNameValuePairs.add(new BasicNameValuePair("userId", userId));
paramsNameValuePairs.add(new BasicNameValuePair("videoId", vId));
paramsNameValuePairs.add(new BasicNameValuePair("friendsSyncDate", syncdate));
serviceClient = new ServiceHandler();
mJsonString = serviceClient.makeServiceCall(strUrl,
ServiceHandler.POST, paramsNameValuePairs);
Log.i("---->>>>>>>>>>", paramsNameValuePairs + "");
}
Log.d("Response Json-----------------------",mJsonString );
return mJsonString;
}catch (Exception e) {
e.getStackTrace();
}
return null;
}
@SuppressWarnings({ "unchecked", "unchecked", "unchecked" })
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
try{
if (result != null) {
JSONObject responsJsonObj = new JSONObject(result);
JSONObject jsonObj = (JSONObject) responsJsonObj
.optJSONObject("data");
try {
String str = jsonObj.getString("error");
if ( str != null || str.length() != 0) {
// error
//Toast.makeText(NewsfeedActivity.this, jsonObj.getString("error"),Toast.LENGTH_LONG).show();
return;
}
} catch (JSONException je) {
Log.d("jex ------>", "" + je.getMessage());
try {
String str = jsonObj.getString("message");
Log.d("message=", "" + str);
if ( str != null || str.length() != 0) {
// VALID RESPONSE, NOW PARSE IT
if (jsonObj.has("comments")) {
JSONArray colArray = jsonObj.getJSONArray("comments");
Log.d("Colunm Array", ""+colArray);
int nComments = colArray.length();
Log.d("# comments", "" + nComments);
for(int i=0; i<nComments; i++){
JSONObject obj = colArray.getJSONObject(i);
Gson Comments = new Gson();
String strComments = Comments.toJson(obj);
Log.d("# obj=", "" + obj.toString());
CommentListInfo cmtInfo = new CommentListInfo();
cmtInfo.c_userId = obj.getString("userId");
cmtInfo.c_name = obj.getString("name");
cmtInfo.DateAdded = obj.getString("dateAdded");
cmtInfo.CommentId = obj.getString("commentId");
cmtInfo.CommentText = obj.getString("text");
cmtInfo.ImageUrl = obj.getString("imageLink");
list_CommentInfo.add(cmtInfo);
}
}
}
if ( str != null || str.length() != 0) {
// VALID RESPONSE, NOW PARSE IT
if (jsonObj.has("addPosition")) {
Log.d("# obj=", "" + jsonObj.toString());
Log.d("Add Position", jsonObj.getString("addPosition"));
}
}
//
if ( str != null || str.length() != 0) {
// VALID RESPONSE, NOW PARSE IT
if (jsonObj.has("friendsSyncDate")) {
Log.d("# friendsDeleted", "" + jsonObj);
Log.d("# obj=", "" + jsonObj.toString());
String myString = m_session.getfriendsSyncDate();
Log.d("myString", myString);
m_session.putfriendsSyncDate(jsonObj.getString("friendsSyncDate"));
Log.d("Sync Date "," "+jsonObj.getString("friendsSyncDate"));
}
}
} catch (JSONException je2) {
je2.printStackTrace();
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
这是我的适配器类。
public class ListCommentAdapter extends BaseAdapter{
private Context mContext;
private List<CommentListInfo> CommentsInfo;
private LayoutInflater inflater;
private String szUserId;
private String szVideoID;
private boolean mBuzy = false;
public ListCommentAdapter(Context context, List<CommentListInfo> cmtInfo) {
// TODO Auto-generated constructor stub
mContext = context;
CommentsInfo = cmtInfo;
AppData mmap = (AppData)this.mContext.getApplicationContext();
szUserId = mmap.getUserId();
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return CommentsInfo.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return CommentsInfo.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Holder holder = new Holder();
CommentListInfo c = CommentsInfo.get(position);
try{
Log.i("nUserId", c.c_userId);
Log.i("nName", c.c_name);
Log.i("nCommentId", c.CommentId);
Log.i("nCommnet", c.CommentText);
Log.i("nImageUrl",c.ImageUrl);
}catch(Exception e){
Log.e("Erore is",""+e);
}
try{
if(inflater==null){
inflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
if(convertView==null){
convertView = inflater.inflate(R.layout.comment_list_item, null);
holder.ciProfileImage = (CircleImageView)convertView.findViewById(R.id.civCFLeftPic);
holder.tvComments = (TextView)convertView.findViewById(R.id.tvCommentbox);
holder.tvCDate = (TextView)convertView.findViewById(R.id.tvCfNotifyDate);
holder.tvName = (TextView)convertView.findViewById(R.id.tvCommentName);
convertView.setTag(holder);
}else{
holder = (Holder)convertView.getTag();
}
if(!mBuzy){
RemoteImageLoader task = new RemoteImageLoader();
task.setImageView(holder.ciProfileImage);
task.execute(c.ImageUrl);
Log.d("ImagerUrl", c.ImageUrl);
if(c.ImageUrl!=null){
Picasso.with(mContext)
.load(R.drawable.world1)
.placeholder(R.drawable.world1)
.error(R.drawable.world1)
.into(holder.ciProfileImage);
}else{
Picasso.with(mContext)
.load(R.drawable.world1)
.placeholder(R.drawable.world1)
.error(R.drawable.world1)
.into(holder.ciProfileImage);
}
holder.tvComments.setText(c.CommentText);
holder.tvCDate.setText(c.DateAdded);
holder.tvName.setText(c.c_name);
holder.tvComments.setTag(null);
}else{
holder.tvComments.setText("Loading...");
holder.tvComments.setTag(this);
}
return convertView;
}catch(Exception e){
System.out.println("Error IS :- "+ e);
}
return convertView;
}
private static class Holder{
private TextView tvName,tvComments,tvCDate;
private CircleImageView ciProfileImage;
}
}
答案 0 :(得分：2)
你可能已经解决了这个问题，但我正在使用Java开发一个不同的应用程序并遇到类似的问题。我有点简单，因为我使用的是本地数据库，但同样的事情。在 CommmentActivity的onCreate 方法中，拉出commentAdapter声明和CommentList.setOnScrollListener并将它们放在自己的方法中。然后在onCreate中调用新定义的commentAdapter方法，然后解析响应。 像这样的东西
public void myAdaperMethod(Context context, List<CommentListInfo> list_CommentInfo){
commentAdapter = new ListCommentAdapter(this, list_CommentInfo);
CommentList.setAdapter(commentAdapter);
CommentList.setOnScrollListener(new OnScrollListener(){...}
}
onCreate{
myAdapterMethod(...);
}
post{...}
get{myAdapterMethod(...);}
希望有所帮助。
答案 1 :(得分：0)
在listadapter具有新数据集之后，您只需要重新绑定控件。
CommentList.DataBind（）;