I'm trying to update a text in a TextView inside the Adapter. The text visually not being displayed even using notifyDataSetChanged (). Use other visuals enable the party goes smoothly! On the issue of TextView I correctly picked up the object and its value and update the look to +1 but does not change.
public class QuestionsAnswersAdapter extends ArrayAdapter<QA> implements Filterable {
private List<QA>filteredData = null;
private ArrayList<QA> arrayQA;
private ViewHolder holder;
private final LayoutInflater inflater;
private Activity activity;
public PerguntasRespostasAdapter(Activity activity,
ArrayList<QA> arrayQA) {
super(activity, 0);
this.inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.arrayQA = arrayQA;
this.filteredData = arrayQA;
this.activity = activity;
}
/**
* Stores the visual components for better performance.
*/
static class ViewHolder {
private TextView tvLocal, tvQuestion, tvAnswer, tvNumLike, tvNumDisLike;
private LinearLayout llContainerLikeDislike, llContainer, llLike, llDisLike;
}
/**
* Return the size of {@code arrayQA}.
*/
@Override
public int getCount() {
return filteredData.size();
}
/**
* Return {@link QA}.
* @param position
* @return {@link QA}
*/
public QA getItemQa(int position) {
return filteredData.get(position);
}
/**
* Insert {@link QA} in the {@code arrayQA}.
* @param qa: {@link QA}
*/
public void addNewQA(final QA qa) {
activity.runOnUiThread(new Runnable() {
@Override
public void run() {
filteredData.add(qa);
notifyDataSetChanged();
}
});
}
/**
* Return the {@code id} of the {@link QA}.
*/
@Override
public long getItemId(int position) {
return filteredData.get(position).getId();
}
/**
* Return line of the {@link BaseAdapter}.
*/
@Override
public View getView(final int position, View convertView, final ViewGroup parent) {
final QA qa = filteredData.get(position);
if (convertView == null) {
convertView = inflater.inflate(R.layout.item_pergunta, null);
holder = new ViewHolder();
Typeface tfLight = Typeface.createFromAsset(activity.getAssets(),
"fonts/Oswald-Light.ttf");
Typeface tfBold = Typeface.createFromAsset(activity.getAssets(),
"fonts/Oswald-Bold.ttf");
holder.tvLocal = (TextView) convertView
.findViewById(R.id.tvLocal);
holder.tvLocal.setTypeface(tfLight);
holder.tvQuestion = (TextView) convertView
.findViewById(R.id.tvQuestion);
holder.tvQuestion.setTypeface(tfBold);
holder.tvAnswer = (TextView) convertView
.findViewById(R.id.tvAnswer);
holder.tvAnswer.setTypeface(tfLight);
holder.tvNumLike = (TextView) convertView
.findViewById(R.id.tvNumLike);
holder.tvNumLike.setTypeface(tfLight);
holder.tvNumDisLike = (TextView) convertView
.findViewById(R.id.tvNumDisLike);
holder.tvNumDisLike.setTypeface(tfLight);
holder.llContainer = (LinearLayout) convertView.findViewById(R.id.llContainer);
holder.llContainerLikeDislike = (LinearLayout) convertView.findViewById(R.id.llContainerLikeDislike);
holder.llLike = (LinearLayout) convertView.findViewById(R.id.llLike);
holder.llDisLike = (LinearLayout) convertView.findViewById(R.id.llDisLike);
holder.llContainer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int visibility = v.findViewById(R.id.llContainerLikeDislike).getVisibility();
if(visibility == View.GONE){
UtilsLab.expand(v.findViewById(R.id.llContainerLikeDislike));
} else {
UtilsLab.collapse(v.findViewById(R.id.llContainerLikeDislike));
}
v.findViewById(R.id.llContainerLikeDislike).requestLayout();
notifyDataSetChanged();
if(UtilsLab.hasIdUpDownVote(activity, String.valueOf(qa.getId()))) {
v.findViewById(R.id.llLike).setEnabled(false);
v.findViewById(R.id.llDisLike).setEnabled(false);
}
}
});
holder.llLike.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
UpDownVoteWsAsyncTask asyncTask = new UpDownVoteWsAsyncTask();
asyncTask.flagUPDown = 1;
asyncTask.id = qa.getId();
asyncTask.tvNumUpdate = (TextView) v.findViewById(R.id.tvNumLike);
asyncTask.llContainerDisable1 = (LinearLayout) v;
asyncTask.llContainerDisable2 = (LinearLayout) ((LinearLayout) v.getParent()).findViewById(R.id.llDisLike);
asyncTask.execute(ConstantsLab.WS_UP_DOWN_VOTE);
}
});
holder.llDisLike.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
UpDownVoteWsAsyncTask asyncTask = new UpDownVoteWsAsyncTask();
asyncTask.flagUPDown = 0;
asyncTask.id = qa.getId();
asyncTask.tvNumUpdate = (TextView) v.findViewById(R.id.tvNumDisLike);
asyncTask.llContainerDisable1 = (LinearLayout) v;
asyncTask.llContainerDisable2 = (LinearLayout) ((LinearLayout) v.getParent()).findViewById(R.id.llLike);
asyncTask.execute(ConstantsLab.WS_UP_DOWN_VOTE);
}
});
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
String name = qa.getName();
String city = qa.getCity();
String state = qa.getState();
if(qa.getName().equals(null) || qa.getName().equals("null")) {
name = " ";
}
if(qa.getCity().equals(null) || qa.getCity().equals("null")) {
city = " ";
}
if(qa.getState().equals(null) || qa.getState().equals("null")) {
state = " ";
}
holder.tvLocal.setText(activity.getString(R.string.local_item_pergunta, name, city, state));
holder.tvQuestion.setText(qa.getQuestion());
holder.tvAnswer.setText(qa.getAnswer());
holder.tvNumLike.setText(String.valueOf(qa.getUp_count()));
holder.tvNumDisLike.setText(String.valueOf(qa.getDown_count()));
return convertView;
}
public Filter getFilter() {
Filter mFilter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
String filterString = constraint.toString().toLowerCase();
FilterResults results = new FilterResults();
final List<QA> list = arrayQA;
int count = list.size();
final ArrayList<QA> nlist = new ArrayList<QA>(count);
QA filterable;
for (int i = 0; i < count; i++) {
filterable = list.get(i);
String questionFiltred = filterable.getQuestion();
if (questionFiltred.toLowerCase().contains(filterString)) {
nlist.add(filterable);
}
}
results.values = nlist;
results.count = nlist.size();
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,
final FilterResults results) {
filteredData = (ArrayList<QA>) results.values;
notifyDataSetChanged();
}
};
return mFilter;
}
/**
* {@link AsyncTask} for the send data like or dislike.
*/
public class UpDownVoteWsAsyncTask extends AsyncTask<String, Integer, Boolean>{
private ProgressDialog progress;
private int id, flagUPDown;
private String flag;
private boolean isError;
private TextView tvNumUpdate;
private LinearLayout llContainerDisable1, llContainerDisable2;
private void closesProgress() {
progress.dismiss();
}
@Override
protected void onPreExecute() {
super.onPreExecute();
progress = ProgressDialog.show(activity, "", activity.getString(R.string.loading_send), true);
}
@SuppressWarnings({ "deprecation" })
@Override
protected Boolean doInBackground(String... params) {
if(params.length > 0) {
if(flagUPDown == 0) {
flag = "down";
} else {
flag = "up";
}
String url = params[0] + id + "/" + flag;
HttpClient httpClient = new DefaultHttpClient();
HttpPut httpPut = new HttpPut(url);
httpPut.setHeader(ConstantsLab.ACCEPT, ConstantsLab.APPLICATION_JSON);
httpPut.setHeader(ConstantsLab.CONTENT_TYPE, ConstantsLab.APPLICATION_JSON_CHARSET_UTF_8);
try {
HttpResponse response = httpClient.execute(httpPut);
if (response != null) {
if (response.getStatusLine().getStatusCode() == 200) {
UtilsLab.setIdUpDownVote(activity, String.valueOf(id));
activity.runOnUiThread(new Runnable() {
@Override
public void run() {
String numString = tvNumUpdate.getText().toString();
String newNumber = String.valueOf(Integer.parseInt(numString) + 1);
//**
*
*
*
*This part of the problem update
*
*
*// tvNumUpdate.setText(newNumber);
llContainerDisable1.setEnabled(false);
llContainerDisable2.setEnabled(false);
notifyDataSetChanged();
}
});
} else {
showErrorDialog(activity
.getString(R.string.erro_ws));
}
} else {
showErrorDialog(activity.getString(R.string.erro_ws));
}
} catch (IOException e) {
e.printStackTrace();
showErrorDialog(activity.getString(R.string.erro_ws));
}
}
return null;
}
@Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
closesProgress();
}
private void showErrorDialog(final String error) {
isError = true;
activity.runOnUiThread(new Runnable() {
@Override
public void run() {
new AlertDialog.Builder(activity)
.setTitle(activity.getString(R.string.warnning))
.setMessage(error)
.setCancelable(false)
.setPositiveButton(R.string.ok,
new DialogInterface.OnClickListener() {
@Override
public void onClick(
DialogInterface dialog,
int which) {
dialog.dismiss();
}
}).create().show();
}
});
}
}
You should be updating your backing data model as that is what is used to refresh the list view when you call notifyDataSetChanged():
holder.llLike.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
qa.setUp_count(qa.getUp_count() + 1);
notifyDataSetChanged();
}
});
来源：https://stackoverflow.com/questions/30892573/textview-inside-the-adapter-not-update