在BaseAdapter中完成Asynctask后，如何修改单个列表项以

Question

In my main activity I display a ListView which uses a custom BaseAdapter (ThoughtListAdapter).

listView = (ListView) findViewById(R.id.list);
adapter = new ThoughtListAdapter(this, resultingThoughts);
listView.setAdapter(adapter);

Every item in the ListView has a custom layout containing a TextView and two Button .

if (convertView == null) {
        convertView = layoutInflater.inflate(R.layout.list_item_thought, null);
}

thoughtText = (TextView) convertView.findViewById(R.id.thought_text_view);
likeButton = (Button) convertView.findViewById(R.id.thought_like_button);
dislikeButton = (Button) convertView.findViewById(R.id.thought_dislike_button);

When a Button is clicked an AsyncTask (AsyncPost) is called which connects to my database and makes some changes.

likeButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            System.out.println("LIKE CLICKED");
            Thought t = thoughtItems.get(position);
            thoughtId = t.getId();
            opinion = 1;

            AsyncPost asyncPost = new AsyncPost(activity,ThoughtListAdapter.this);
            asyncPost.execute(SHARE_THOUGHT_URL,
                    TAG_PERSON_EMAIL, "m@b.it",
                    TAG_THOUGHT_ID, thoughtId.toString(),
                    TAG_OPINION, opinion.toString());
        }
    });

What I need is making both Button -s of a list item disappear after the AsyncTask is done with a successful outcome. I have a method onComplete(JSONObject json) which elaborates the JSONObject returned by the AsyncTask . I try to make the buttons non visible inside the onComplete method, but this doesn't work because onComplete() doesn't know which exact button has been clicked. How can I pass an instance of the exact clicked button inside onComplete() and make disappear only the Like and Dislike buttons of the concerned list item?

AsyncPost is a global AsyncTask used by all my other activities. I would strongly prefer to leave it alone. The onComplete() method functions as the onPostExecute() method of the AsyncTask . Here are the getView() and onComplete() methods inside my BaseAdapter , which contain all the code shown above. Thank you.

public View getView(final int position, View convertView, ViewGroup parent) {
    if (layoutInflater == null) {
        layoutInflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    if (convertView == null) {
        convertView = layoutInflater.inflate(R.layout.list_item_thought, null);
    }


    thoughtText = (TextView) convertView.findViewById(R.id.thought_text_view);
    likeButton = (Button) convertView.findViewById(R.id.thought_like_button);
    dislikeButton = (Button) convertView.findViewById(R.id.thought_dislike_button);

    //thoughtItems is a list of custom ojbects (Thought)
    Thought t = thoughtItems.get(position);

    //Here i set the content of the current TextView
    thoughtText.setText(t.getText());

    //the two buttons do basically the same thing when get clicked
    likeButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Thought t = thoughtItems.get(position);
            thoughtId = t.getId();
            opinion = 1;

            AsyncPost asyncPost = new AsyncPost(activity,ThoughtListAdapter.this);
            asyncPost.execute(SHARE_THOUGHT_URL,
                    TAG_PERSON_EMAIL, "m@b.it",
                    TAG_THOUGHT_ID, thoughtId.toString(),
                    TAG_OPINION, opinion.toString());
        }
    });

    dislikeButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Thought t = thoughtItems.get(position);
            thoughtId = t.getId();
            opinion = 0;

            AsyncPost asyncPost = new AsyncPost(activity,ThoughtListAdapter.this);
            asyncPost.execute(SHARE_THOUGHT_URL,
                                TAG_PERSON_EMAIL, "m@b.it",
                                TAG_THOUGHT_ID, thoughtId.toString(),
                                TAG_OPINION, opinion.toString());
        }
    });

    return convertView;
}

@Override
public void onComplete(JSONObject json) {
    if (json != null) {
        try {
            if (json.getInt(TAG_SUCCESS) == 0) {
                Toast.makeText(activity, "Operazione non riuscita.", Toast.LENGTH_LONG).show();
            } else {
                //if everything is good i try to make the buttons of that particular list item disappear
                likeButton.setVisibility(View.GONE);
                dislikeButton.setVisibility(View.GONE);
            }
        }
        catch (JSONException e) {
            Log.e(TAG_LOG, "JSONException", e);
        }
    }
    else Toast.makeText(activity, "Errore connessione!", Toast.LENGTH_LONG).show();
}

Answer 1

One solution to this would be to have something on your Thought object to indicate whether or not to show the buttons.

So in your getView() method you check this

likeButton = (Button) convertView.findViewById(R.id.thought_like_button);
dislikeButton = (Button) convertView.findViewById(R.id.thought_dislike_button);

Thought t = thoughtItems.get(position);
if (t.hideButtons()) {
    likeButton.setVisibility(View.GONE);
    dislikeButton.setVisibility(View.GONE); 
}
else {
    likeButton.setVisibility(View.VISIBLE);
    dislikeButton.setVisibility(View.VISIBLE); 
}

Then you would need to have your onComplete method return the id of the Thought object that it related to. Then inside your onComplete you could do

int id = //get your id from your JSON response
for(Thought t : thoughtItems) {
    if (t.getId() == id) {
        t.setHideButtons(true);
        notifyDataSetChanged();
        break;
    }
}

By calling notifyDataSetChanged() it will redraw your list and when it does the check for whether it should show the buttons or not it will not show them because it was set on that thought item