【发布时间】：2014-10-05 06:15:13
【问题描述】：
我的列表视图旨在直接从 JSONArray 添加结果。有什么办法可以让它只添加列表视图中不存在的项目？我正在使用自定义适配器。
getTweets AsyncTask
public class getTweets extends AsyncTask<Void, Void, Void>{
int counter;
@Override
protected Void doInBackground(Void... params) {
BufferedReader reader =null;
// TODO Auto-generated method stub
try{
HttpClient hc = new DefaultHttpClient();
HttpGet get = new HttpGet("https://api.twitter.com/1.1/statuses/home_timeline.json?count=40");
ParseTwitterUtils.getTwitter().signRequest(get);
HttpResponse rp = hc.execute(get);
String result2 = EntityUtils.toString(rp.getEntity());
JSONArray array = new JSONArray(result2);
for(int i=0; i < array.length(); i++){
JSONObject session = array.getJSONObject(i);
JSONObject profilePic = session.getJSONObject("user");
addTweet(profilePic.getString("name"),profilePic.getString("screen_name"),session.getString("text"),profilePic.getString("profile_image_url"));
}
}catch (Exception e) {
Log.e("TwitterFeedActivity", "Error loading JSON", e);
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
tweetListView.setAdapter(tweetAdapter);
return;
}
}
public void addTweet(String user,String mentionname,String tweet,String profile_picture){
tweetAdapter.add(new TweetList(user,mentionname, tweet,profile_picture));
}
ListView 适配器
public class TweetArrayAdapter extends ArrayAdapter<Object> {
private TextView tweet,twitterUser,twitterMention;
ImageView profile_picture;
private List<TweetList> tweetList = new ArrayList<TweetList>();
public void add(TweetList object) {
tweetList.add(object);
super.add(object);
}
public TweetArrayAdapter(Context context, int textViewResourceId) {
super(context, textViewResourceId);
}
public int getCount() {
return this.tweetList.size();
}
public TweetList getItem(int position) {
return this.tweetList.get(position);
}
@SuppressLint("ViewHolder")
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
LayoutInflater inflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.tweet_list_item, parent, false);
twitterUser = (TextView)row.findViewById(R.id.display_name);
tweet = (TextView) row.findViewById(R.id.display_tweet);
twitterMention = (TextView)row.findViewById(R.id.display_twitter_mentionname);
profile_picture = (ImageView)row.findViewById(R.id.profile_picture);
TweetList tweetMessageObj = getItem(position);
SpannableString hashtag = new SpannableString(tweetMessageObj.tweet);
Matcher matcher = Pattern.compile("@([A-Za-z0-9_-]+)").matcher(hashtag);
Matcher matcher2 = Pattern.compile("#([A-Za-z0-9_-]+)").matcher(hashtag);
while (matcher.find())
{
hashtag.setSpan(new ForegroundColorSpan(Color.rgb(79, 120, 216)), matcher.start(), matcher.end(), 0);
hashtag.setSpan(new ClickableSpan() {
@Override
public void onClick(View widget) {
// TODO Auto-generated method stub
TextView tv = (TextView)widget;
String tags = tv.getText().subSequence(tv.getSelectionStart(),tv.getSelectionEnd()).toString();
Toast.makeText(getActivity(), tags, Toast.LENGTH_LONG).show();
}
public void updateDrawState(TextPaint ds) {// override updateDrawState
ds.setUnderlineText(false); // set to false to remove underline
}
},matcher.start(), matcher.end(), 0);
}
while (matcher2.find())
{ hashtag.setSpan(new ForegroundColorSpan(Color.rgb(79, 120, 216)), matcher2.start(), matcher2.end(), 0);
hashtag.setSpan(new ClickableSpan() {
@Override
public void onClick(View widget) {
// TODO Auto-generated method stub
TextView tv = (TextView)widget;
String tags = tv.getText().subSequence(tv.getSelectionStart(),tv.getSelectionEnd()).toString();
Toast.makeText(getActivity(), tags, Toast.LENGTH_LONG).show();
}
public void updateDrawState(TextPaint ds) {// override updateDrawState
ds.setUnderlineText(false); // set to false to remove underline
}
},matcher2.start(), matcher2.end(), 0);
}
tweet.setText(hashtag, BufferType.SPANNABLE);
tweet.setMovementMethod(LinkMovementMethod.getInstance());
tweet.setHighlightColor(Color.TRANSPARENT);
Typeface tf = Typeface.createFromAsset(getActivity().getAssets(), "fonts/light.ttf");
tweet.setTypeface(tf);
Typeface tf2 = Typeface.createFromAsset(getActivity().getAssets(), "fonts/bold.ttf");
twitterUser.setText(tweetMessageObj.twittername);
twitterUser.setTypeface(tf2);
twitterMention.setText("@" + tweetMessageObj.mentionname);
Picasso.with(getActivity()).load(tweetMessageObj.pictureURL).resize(400,400).into(profile_picture);
return row;
}
}
推文列表
public class TweetList {
public String twittername,mentionname,tweet,pictureURL;
public TweetList(String twittername,String mentionname,String tweet,String pictureURL) {
super();
this.twittername = twittername;
this.tweet = tweet;
this.pictureURL = pictureURL;
this.mentionname = mentionname;
}
}
【问题讨论】：
标签： android json listview twitter custom-adapter