我限制在我的列表视图中显示 15 条记录。15 条记录成功显示，但是当我单击加载更多按钮时，它会添加前 15 条记录和新记录。这是我的异步任务，正在添加更多记录。我使用文章Adapter.notifyDataSetChanged(); 也设置了，但问题仍然存在。我相信它与articlesFiltered.size()/15)+1 有关。
public class ActusScreen extends BaseActivity implements OnClickListener {
private DisplayImageOptions options;
ImageLoader imageLoader;
String link;
//...
final int NONE=0;
final int THEME=1;
final int SEARCH=2;
final int THEME_TO_SEARCH=3;
final int SEARCH_RESULTS=4;
final int THEME_TO_SEARCH_RESULTS=5;
int MODE=NONE;
public ArrayList<Article> articles;
public ArrayList<Article> articlesFiltered;
public ArrayList<Theme> themes;
public ArrayList<Theme> themeFiltered;
public static int titleIndex=0;
static boolean original_view = false;
RelativeLayout adLayout;
ListView themesList;
RelativeLayout searchLayout;
EditText searchField;
Button back, theme;
StringBuilder builder;
ScrollView scrollme;
ThemesAdapter themeAdapter;
ArticlesAdapter articlesAdapter;
TextView header_text;
ActusScreen context;
ProgressDialog pd;
ImageView image_actus;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.actus);
context=this;
back=(Button)findViewById(R.id.envoye);
back.setOnClickListener(this);
back.setVisibility(View.GONE);
theme=(Button)findViewById(R.id.theme);
theme.setOnClickListener(this);
Button search=(Button)findViewById(R.id.search);
search.setOnClickListener(this);
header_text = (TextView)findViewById(R.id.text_titre);
header_text.setText(getResources().getText(R.string.actus).toString());
adLayout=(RelativeLayout)findViewById(R.id.adLayout);
themeAdapter=new ThemesAdapter(this);
themesList=(ListView)findViewById(R.id.themesList);
themesList.setAdapter(themeAdapter);
themesList.setVisibility(View.GONE);
SelectedArticle.mtypo=1;
articlesAdapter=new ArticlesAdapter(this);
ListView articlesList=(ListView)findViewById(R.id.articlesList);
articlesList.setAdapter(articlesAdapter);
searchLayout=(RelativeLayout)findViewById(R.id.searchLayout);
searchLayout.setVisibility(View.GONE);
searchField=(EditText)findViewById(R.id.keyword);
Button valid=(Button)findViewById(R.id.valid);
valid.setOnClickListener(this);
new GetAllArticlesTask().execute();
image_actus = (ImageView)findViewById(R.id.image);
image_actus.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String url = link;
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
startActivity(i);
}
});
options = new DisplayImageOptions.Builder()
// .showStubImage(R.drawable.ic_launcher)
.displayer(new RoundedBitmapDisplayer(3))
.cacheInMemory()
.cacheOnDisc()
.build();
imageLoader = ImageLoader.getInstance();
imageLoader.init(ImageLoaderConfiguration.createDefault(getApplicationContext()));
new backTask().execute("");
}
@Override
protected void onStart() {
// TODO Auto-generated method stub
//FavoriteScreen.flagx=1;
super.onStart();
}
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.envoye:
back();
break;
case R.id.theme:
if(themesList.getVisibility()==View.VISIBLE)
themesList.setVisibility(View.GONE);
else
themesList.setVisibility(View.VISIBLE);
break;
case R.id.search:
search();
break;
case R.id.valid:
searchLayout.setVisibility(View.GONE);
if(MODE==SEARCH)
MODE=SEARCH_RESULTS;
else
MODE=THEME_TO_SEARCH_RESULTS;
filterArticles();
break;
}
}
public void search(){
switch(MODE){
case SEARCH_RESULTS:
searchLayout.setVisibility(View.VISIBLE);
MODE=SEARCH;
break;
case THEME_TO_SEARCH_RESULTS:
searchLayout.setVisibility(View.VISIBLE);
MODE=THEME_TO_SEARCH;
break;
case THEME:
searchLayout.setVisibility(View.VISIBLE);
MODE=THEME_TO_SEARCH;
break;
case NONE:
searchLayout.setVisibility(View.VISIBLE);
back.setVisibility(View.VISIBLE);
theme.setVisibility(View.GONE);
MODE=SEARCH;
break;
}
}
public void back(){
switch(MODE){
case SEARCH_RESULTS:
searchLayout.setVisibility(View.VISIBLE);
MODE=SEARCH;
break;
case THEME_TO_SEARCH_RESULTS:
searchLayout.setVisibility(View.VISIBLE);
MODE=THEME_TO_SEARCH;
break;
case THEME:
back.setVisibility(View.GONE);
theme.setVisibility(View.VISIBLE);
/*
*
Intent intent = getIntent();
finish();
startActivity(intent);
*/
articlesAdapter=new ArticlesAdapter(this);
ListView articlesList=(ListView)findViewById(R.id.articlesList);
articlesList.setAdapter(articlesAdapter);
//ActusScreen.titleIndex=0;
ArticlesAdapter.mode = true;
titleIndex=0;
new GetAllArticlesTask().execute();
header_text.setText(getResources().getText(R.string.actus).toString());
MODE=NONE;
break;
case SEARCH:
searchLayout.setVisibility(View.GONE);
back.setVisibility(View.GONE);
theme.setVisibility(View.VISIBLE);
MODE=NONE;
copyArticles();
articlesAdapter.notifyDataSetChanged();
break;
case THEME_TO_SEARCH:
searchLayout.setVisibility(View.GONE);
MODE=THEME;
copyArticles();
articlesAdapter.notifyDataSetChanged();
break;
}
}
private void copyArticles() {
if(articles!=null){
if(articlesFiltered==null)
articlesFiltered=new ArrayList<Article>();
else
articlesFiltered.clear();
for(Article a: articles)
articlesFiltered.add(a);
}
}
public void filterArticles(){
String key=searchField.getText().toString().toLowerCase();
if(key.length()>0){
if(articlesFiltered!=null){
articlesFiltered.clear();
System.gc();
}
for(Article a: articles){
if(a.name.toLowerCase().contains(key))
articlesFiltered.add(a);
}
articlesAdapter.notifyDataSetChanged();
}
}
private class GetAllArticlesTask extends AsyncTask<Void, Void, Void> {
@Override
public Void doInBackground(Void... params) {
if(Globals.themes==null)
Globals.themes=HTTPFunctions.getThemesList();
if(articles!=null){
articles.clear();
System.gc();
}
articles=HTTPFunctions.getAllArticles();
copyArticles();
return null;
}
@Override
public void onPreExecute() {
pd = ProgressDialog.show(context, "", context.getResources().getString(R.string.loading), true, false);
}
@Override
public void onPostExecute(Void result) {
pd.dismiss();
articlesAdapter.notifyDataSetChanged();
themeAdapter.notifyDataSetChanged();
}
}
private class GetThemeArticlesTask extends AsyncTask<String, Void, Void> {
@Override
public Void doInBackground(String... params) {
if(articles!=null){
articles.clear();
System.gc();
}
articles=HTTPFunctions.getThemeArticles(params[0]);
//begin 06/03; articles.theme_id not set by HTTPFunctions when a specific theme is selected; need to set it explicitly
for (Article a : articles)
a.theme_id=params[0];
//end
System.out.println("theme article: "+ HTTPFunctions.getThemeArticles(params[0]));
copyArticles();
return null;
}
@Override
public void onPreExecute() {
pd = ProgressDialog.show(context, "", context.getResources().getString(R.string.loading), true, false);
}
@Override
public void onPostExecute(Void result) {
pd.dismiss();
articlesAdapter.notifyDataSetChanged();
}
}
private class GetMoreArticlesTask extends AsyncTask<Void, Void, Void> {
@Override
public Void doInBackground(Void... params) {
ArrayList<Article>moreArticles=HTTPFunctions.getMoreArticles(addOne((articlesFiltered.size()/15)));
if(moreArticles!=null){
articles.addAll(articles);
copyArticles();
}
return null;
}
@Override
public void onPreExecute() {
pd = ProgressDialog.show(context, "", context.getResources().getString(R.string.loading), true, false);
}
@Override
public void onPostExecute(Void result) {
pd.dismiss();
articlesAdapter.notifyDataSetChanged();
}
}
public void articleSelected(int id){
Globals.copyArticles(articlesFiltered);
Intent i=new Intent(context, SelectedArticle.class);
i.putExtra("id", id);
//begin
//i.putExtra("title", ArticlesAdapter.selected);
if (titleIndex==0){
String title=Util.getTitleName(articlesFiltered.get(id).type, articlesFiltered.get(id).theme_id);
i.putExtra("title", title);
}
else{
String title=ArticlesAdapter.selected.toUpperCase();
i.putExtra("title", title);
}
//end
context.startActivity(i);
}
public void themeSelected(int id){
themesList.setVisibility(View.GONE);
MODE=THEME;
theme.setVisibility(View.GONE);
back.setVisibility(View.VISIBLE);
ArticlesAdapter.mode = false;
//begin 06/03
//ArticlesAdapter.selected=Globals.themes.get(id).name;
//header_text.setText(Globals.themes.get(id).name.toUpperCase());
Spanned name=Html.fromHtml(Globals.themes.get(id).name);
System.out.println("spanned name: "+ name);
ArticlesAdapter.selected=name.toString().toUpperCase();
header_text.setText(name.toString().toUpperCase());
//end
System.out.println("theme_name: "+ Globals.themes.get(id).name);
new GetThemeArticlesTask().execute(Globals.themes.get(id).id);
}
public void loadMore(){
new GetMoreArticlesTask().execute();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
if (original_view==true){
new GetAllArticlesTask().execute();
theme.setVisibility(View.VISIBLE);
back.setVisibility(View.GONE);
header_text.setText(getResources().getText(R.string.actus).toString());
original_view=false;
}
super.onResume();
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
SelectedReglementation.setview=true;
super.onPause();
}
class backTask extends AsyncTask<String, Void, ArrayList<Post>> {
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
}
@Override
protected ArrayList<Post> doInBackground(String... urls) {
ArrayList<Post> newpostarraylist=new ArrayList<Post>();
try{
URL url = new URL("");
BufferedReader reader = null;
builder = new StringBuilder();
try {
reader = new BufferedReader(new InputStreamReader(url.openStream(), "UTF-8"));
for (String line; (line = reader.readLine()) != null;) {
builder.append(line.trim());
}
} finally {
if (reader != null) try { reader.close(); } catch (IOException logOrIgnore) {}
}
System.out.println("Builder: "+ builder);
}catch(Exception ex){}
return newpostarraylist;
}
@Override
protected void onPostExecute(ArrayList<Post> result) {
String[] banner_image = builder.toString().split(";");
imageLoader.displayImage(banner_image[2], image_actus,options);
link = banner_image[1];
}
}
public int addOne(int i){
return i+1;
}
}
和我的文章适配器
public class ArticlesAdapter extends BaseAdapter {
ActusScreen main;
ImageLoader imageLoader;
String imageUrl="";
public static String selected="";
public static boolean mode=false;
int x=0;
//disable a.theme_id null pointer wh
public static int bine=0;
public ArticlesAdapter(ActusScreen m) {
main=m;
imageLoader=new ImageLoader(m);
}
public int getCount() {
if(main.articlesFiltered!=null)
return main.articlesFiltered.size();
return 0;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView==null) {
convertView=newView(position, parent);
holder = new ViewHolder();
holder.image=(ImageView)convertView.findViewById(R.id.image);
holder.remove=(ImageView)convertView.findViewById(R.id.remove);
holder.title=(TextView)convertView.findViewById(R.id.title);
holder.text_title=(TextView)convertView.findViewById(R.id.text_title);
holder.more=(RelativeLayout)convertView.findViewById(R.id.moreLayout);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
Article a=main.articlesFiltered.get(position);
imageLoader.DisplayImage(String.format(imageUrl, a.image), holder.image);
String str = a.name;
int length = str.length();
String newStr = a.name;
if (length>65)
newStr = str.replaceAll("^(.{74})(.*)$","$1...");
holder.title.setText(Html.fromHtml(newStr));
holder.text_title.setText(selected.toUpperCase());
holder.remove.setVisibility(View.GONE);
if (holder.text_title.equals(null))
holder.text_title.setText("t");
if(position==main.articlesFiltered.size()-1 && main.articlesFiltered.size()<=45 && main.articlesFiltered.size()%15==0)
holder.more.setVisibility(View.VISIBLE);
else
holder.more.setVisibility(View.GONE);
convertView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
main.articleSelected(position);
SelectedArticle.mtypo=1;
}
});
holder.more.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
main.loadMore();
}
});
if (ActusScreen.titleIndex==0){
...
}
}
return(convertView);
}
private View newView(int position, ViewGroup parent) {
return(main.getLayoutInflater().inflate(R.layout.articles_row, parent, false));
}
class ViewHolder {
ImageView image, remove;
TextView title;
TextView text_title;
RelativeLayout more;
}
}
UPDATE 和 HttpFunction getMoreArticles()
public static ArrayList<Article> getMoreArticles(int page){
String url=LAST_ARTICLE_URL;
if(url.endsWith(".php"))
url+="?page="+page;
else
url+="&page="+page;
String response=getResponse(url);
if(!ERROR.equals(response)){
return JsonParsingFunctions.parseArticles(response);
}
return null;
}