http://developer.android.com/reference/android/support/v4/view/ViewPager.html#setOffscreenPageLimit(int)
just set it to 2
On Wednesday, October 17, 2012 7:30:54 PM UTC+2, Giosia Gentile wrote:
>
> it is one week I try to solve this problem whitout success. Please
> help me.
>
> I use the tabs navigation with viewpager. This is the class where I
> put the tabs and the FragmentPagerAdapter class:
> public class Detail extends SherlockFragmentActivity {
>
> ViewPager mViewPager;
>
> TabsAdapter mTabsAdapter;
>
>
> @Override
> public void onCreate(Bundle savedInstanceState) {
>
> super.onCreate(savedInstanceState);
>
>
> setContentView(R.layout.activity_main);
>
> ...
>
>
>
> ActionBar bar = getSupportActionBar();
> bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
> bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
>
> mViewPager = (ViewPager)findViewById(R.id.pager);
>
> // Add the tabs
> mTabsAdapter = new TabsAdapter(this, bar, mViewPager);
> mTabsAdapter.addTab(bar.newTab().setText(R.string.filmtab),
> FragmentFilm.class, null);
> mTabsAdapter.addTab(bar.newTab().setText(R.string.cinematab),
> FragmentCinema.class, null);
> mTabsAdapter.addTab(bar.newTab().setText(R.string.dintornitab),
> FragmentPdi.class, null);
>
>
>
> if (savedInstanceState != null) {
>
> bar.setSelectedNavigationItem(savedInstanceState.getInt("tab"));
> }
>
>
>
> }
>
>
> @Override
> protected void onSaveInstanceState(Bundle outState) {
> super.onSaveInstanceState(outState);
> outState.putInt("tab",
> getSupportActionBar().getSelectedNavigationIndex());
> }
>
>
> public static class TabsAdapter extends FragmentPagerAdapter
> implements ViewPager.OnPageChangeListener, ActionBar.TabListener
> {
> private final Context mContext;
> private final ActionBar mBar;
> private final ViewPager mViewPager;
> private final ArrayList<TabInfo> mTabs = new
> ArrayList<TabInfo>();
>
> static final class TabInfo {
> private final Class<?> clss;
> private final Bundle args;
>
> TabInfo(Class<?> _class, Bundle _args) {
> clss = _class;
> args = _args;
> }
> }
>
> public TabsAdapter(Detail activity, ActionBar bar, ViewPager
> pager) {
> super(activity.getSupportFragmentManager());
> mContext = activity;
> mBar = bar;
> mViewPager = pager;
> mViewPager.setAdapter(this);
> mViewPager.setOnPageChangeListener(this);
> }
>
> public void addTab(ActionBar.Tab tab, Class<? extends
> Fragment> clss, Bundle args) {
> TabInfo info = new TabInfo(clss, args);
> tab.setTag(info);
> tab.setTabListener(this);
> mTabs.add(info);
> mBar.addTab(tab);
> notifyDataSetChanged();
> }
>
> @Override
> public int getCount() {
> return mTabs.size();
> }
>
> @Override
> public Fragment getItem(int position) {
> TabInfo info = mTabs.get(position);
> return Fragment.instantiate(mContext,
> info.clss.getName(), info.args);
> }
>
> @Override
> public void onPageScrolled(int position, float
> positionOffset, int positionOffsetPixels) {
> }
>
> @Override
> public void onPageSelected(int position) {
> mBar.setSelectedNavigationItem(position);
> }
>
> @Override
> public void onPageScrollStateChanged(int state) {
> }
>
> @Override
> public void onTabSelected(Tab tab, FragmentTransaction ft) {
> Object tag = tab.getTag();
> for (int i=0; i<mTabs.size(); i++) {
> if (mTabs.get(i) == tag) {
> mViewPager.setCurrentItem(i);
> }
> }
> }
>
> @Override
> public void onTabUnselected(Tab tab, FragmentTransaction ft)
> {
>
> }
>
> @Override
> public void onTabReselected(Tab tab, FragmentTransaction ft)
> {
>
> }
> }
> }
>
> The 3 fragment classes are all the same I copy here just one; In the
> fragment class I use async task for download the data I need to put in
> the view, I do this in the onActivityCreated method:
>
> public class FragmentFilm extends SherlockFragment
> {
>
> private Detail act;
>
> private DetailedRec detail_film;
> private View view;
> private String a;
>
>
>
>
> @Override
> public View onCreateView(LayoutInflater inflater, ViewGroup
> container,
> Bundle savedInstanceState)
> {
>
>
>
> setRetainInstance(true);
> view = inflater.inflate(R.layout.tab_film_info, container,
> false);
>
> return view;
> }
>
> /*
> @Override
> public void onSaveInstanceState(Bundle outState) {
> super.onSaveInstanceState(outState);
>
>
> }*/
>
>
> @Override
> public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
>
> act = (Detail) getActivity();
>
>
> }
>
>
>
>
> @Override
> public void onActivityCreated(Bundle savedInstanceState) {
> super.onActivityCreated(savedInstanceState);
> new DownloadFilmDetailAsyncTask().execute();
>
>
> }
>
>
>
> private class DownloadFilmDetailAsyncTask extends AsyncTask<Void,
> DetailedRec, Void>
> {
>
> @Override
> protected void onPreExecute() {
>
> super.onPreExecute();
>
>
> }
>
> @Override
> protected void onPostExecute(Void result) {
>
> super.onPostExecute(result);
>
> ProgressBar prBar =
> (ProgressBar)getView().findViewById(R.id.progressbar_film);
> prBar.setVisibility(View.GONE);
> ScrollView lay =
> (ScrollView)getView().findViewById(R.id.tab_filmsummary);
> lay.setVisibility(View.VISIBLE);
>
>
> }
>
> @Override
> protected Void doInBackground(Void... params)
> {
> try
> {
>
>
> String locale =
> getResources().getConfiguration().locale.getDisplayName();
>
>
> JSONObject objSend = new JSONObject();
> objSend.put("idFilm", act.getIdFilm());
> objSend.put("cinemaId",act.getIdCinema());
> int ind = locale.indexOf("(");
> String locale_send = locale.substring(0, ind-1);
> objSend.put("locale", locale_send);
> ArrayList<String> otherCin = new
> ArrayList<String>(Arrays.asList(act.getOtherCinemas()));
> JSONArray othCin = new JSONArray(otherCin);
> objSend.put("otherCinemas", othCin );
> JSONObject jsonObject =
> sendAndGetJSONObject(JSON_SERVER+"JsonServer?op=getFilmbyId",objSend);
>
>
>
> DetailedRec detail_rec = new DetailedRec();
> //FILM
> detail_rec.setFilmId(jsonObject.getString("filmId"));
> detail_rec.setName(jsonObject.getString("name"));
>
> detail_rec.setImageUrl(jsonObject.getString("imageUrl").replace("640",
> "80"));
> detail_rec.setActors(jsonObject.getString("actors"));
> detail_rec.setGenre(jsonObject.getString("genre"));
>
> detail_rec.setDirector(jsonObject.getString("director"));
> detail_rec.setPlot(jsonObject.getString("plot"));
> detail_rec.setYear(jsonObject.getString("year"));
>
> detail_rec.setDuration(jsonObject.getString("duration"));
>
> detail_rec.setTrailer(jsonObject.getString("trailer"));
> detail_rec.setRating(jsonObject.getString("rating"));
>
> detail_film = detail_rec;
> publishProgress(detail_rec);
>
>
> }
> catch (IOException ignored)
> {
> }
> catch (JSONException ignored)
> {
> }
> return null;
> }
>
> @Override
> protected void onProgressUpdate(DetailedRec... values)
> {
> for (final DetailedRec detail_rec : values)
> {
>
> updateViews(detail_rec);
>
> }
>
> }
>
> private JSONObject getJSONObject(String url) throws
> IOException, MalformedURLException, JSONException
> {
> HttpURLConnection conn = (HttpURLConnection) new
> URL(url).openConnection();
>
>
> InputStream in = conn.getInputStream();
>
> try
> {
> StringBuilder sb = new StringBuilder();
> BufferedReader r = new BufferedReader(new
> InputStreamReader(new DoneHandlerInputStream(in),"WINDOWS_1252"));
> for (String line = r.readLine(); line != null; line =
> r.readLine())
> {
> sb.append(line);
> }
> return new JSONObject(sb.toString());
> }
> finally
> {
> in.close();
> }
> }
>
>
> private JSONObject sendAndGetJSONObject(String url,JSONObject
> request) throws IOException, MalformedURLException, JSONException
> {
>
> HttpClient client = new DefaultHttpClient();
>
> HttpConnectionParams.setConnectionTimeout(client.getParams(),
> 10000); //Timeout Limit
> InputStream in=null;
> try{
> HttpPost post = new HttpPost(url);
> StringEntity se = new
> StringEntity(request.toString());
> se.setContentType((Header) new
> BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
> post.setEntity(se);
> HttpResponse response = client.execute(post);
> HttpEntity entity = response.getEntity();
> in = entity.getContent();
> StringBuilder sb = new StringBuilder();
> BufferedReader r = new BufferedReader(new
> InputStreamReader(new DoneHandlerInputStream(in),"WINDOWS_1252"));
> for (String line = r.readLine(); line != null; line =
> r.readLine())
> {
> sb.append(line);
> }
> return new JSONObject(sb.toString());
> }catch(Exception e){
>
> }
> finally
> {
> in.close();
> }
>
> return null;
>
> }
>
>
> }
>
> private void updateViews(final DetailedRec detail_rec){
> //FILM
> TextView filmName = (TextView)
> getView().findViewById(R.id.movieTitle);
> filmName.setText(detail_rec.getName().trim());
> TextView actors = (TextView)
> getView().findViewById(R.id.movieActor);
> actors.setText(detail_rec.getActors().trim());
> TextView genre = (TextView)
> getView().findViewById(R.id.movieGenre);
> genre.setText(detail_rec.getGenre().trim());
> TextView director = (TextView)
> getView().findViewById(R.id.movieDirector);
> director.setText(detail_rec.getDirector().trim());
> TextView plot = (TextView)
> getView().findViewById(R.id.moviePlot);
> plot.setText(detail_rec.getPlot().trim());
> TextView year = (TextView)
> getView().findViewById(R.id.movieYear);
> year.setText(detail_rec.getYear().trim());
> TextView duration = (TextView)
> getView().findViewById(R.id.movieDuration);
> duration.setText(detail_rec.getDuration().trim());
> ImageView image = (ImageView)
> getView().findViewById(R.id.moviePoster);
>
> new
> DownloadImagesTask(detail_rec.getImageUrl().trim().replace("80",
> "100")).execute(image);
> //
> image.setImageBitmap(downloadBitmap(detail_rec.getImageUrl().trim().replace("80",
>
>
> "100")));
> //Rating
> if(detail_rec.getRating().compareTo("N/A")!=0){
> RatingBar rateBar =
> (RatingBar)getView().findViewById(R.id.MovieRatingBar);
>
> rateBar.setRating(Float.parseFloat(detail_rec.getRating()));
> }
> //Trailer
> Button trailer = (Button)getView().findViewById(R.id.trailer);
> if(detail_rec.getTrailer().compareTo("")!=0){
> trailer.setVisibility(View.VISIBLE);
> trailer.setOnClickListener(new OnClickListener() {
>
> @Override
> public void onClick(View v) {
> int index = detail_rec.getTrailer().indexOf("v=");
> String videoId="";
> if(index!=-1){
> videoId =
> detail_rec.getTrailer().substring(index+2); //"Fee5vbFLYM4";
> Intent intent = new Intent(Intent.ACTION_VIEW,
> Uri.parse("vnd.youtube:"+videoId));
> intent.putExtra("VIDEO_ID", videoId);
> startActivity(intent);
> }
>
>
> }
> });
> }
>
> }
>
> }
>
> Ok, in my application I want the fragment is load one time. I explain
> so good: When I start the Detail class the fragment classes are
> istantiate and the AsyncTask in all the 3 fragment start, now when the
> user switch from one tab to other I want the fragment in tab
> unselected don't lost the data and the view because now when I switch
> from one tab to another and then return the first tab this is recreate
> and the onActivityCreated method is called again!
>
> Please help me, I search in all place but I dont find solution!!
>
> P.S. I use the SherlockActionBar, I don't know id it is relevant.
> Sorry for my bad English
>
> Thank you
>
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