PagerAdapter

Question

我有以下课程：

public class ChannelsListTabsFragment extends Fragment {

    private SlidingTabLayout mSlidingTabLayout;
    private ViewPager mViewPager;
    public ListChannelsPagerAdapter listChannelsPagerAdapter;
    private ChannelCountriesModel[] tabTitles;
    private Context applicationContext;
    private String session;
    private long time_offset;
    private ListView listViewFragment;

    public static ChannelsListTabsFragment newInstance(String session, ChannelCountriesModel[] tabTitles, long time_offset) {
        ChannelsListTabsFragment fragment = new ChannelsListTabsFragment();
        Bundle args = new Bundle();
        args.putParcelableArray("tabTitles", tabTitles);
        args.putString("session", session);
        args.putLong("time_offset", time_offset);
        fragment.setArguments(args);
        return fragment;
    }

    public ChannelsListTabsFragment() {}

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_tabbet, container, false);
        System.out.println("onCreateView");
        applicationContext = getActivity().getApplicationContext();
        tabTitles = (ChannelCountriesModel[]) getArguments().getParcelableArray("tabTitles");
        session = getArguments().getString("session");
        time_offset = getArguments().getLong("time_offset");

        return inflater.inflate(R.layout.channels_list_tabs_fragment, container, false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        mViewPager = (ViewPager) view.findViewById(R.id.viewpager);
        listChannelsPagerAdapter = new ListChannelsPagerAdapter(session, tabTitles);
        mViewPager.setAdapter(listChannelsPagerAdapter);

        mSlidingTabLayout = (SlidingTabLayout) view.findViewById(R.id.sliding_tabs);

        mSlidingTabLayout.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
            @Override
            public int getIndicatorColor(int position) {
                return getResources().getColor(R.color.myred);
            }

            @Override
            public int getDividerColor(int position) {
                return getResources().getColor(R.color.myred);
            }
        });

        mSlidingTabLayout.setViewPager(mViewPager);
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        if (v.getId()==R.id.channelList) {
            AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo)menuInfo;
            Object o = listViewFragment.getItemAtPosition(info.position);
            Channel_Model channelModel = (Channel_Model) o;
            menu.setHeaderTitle(channelModel.getCh_Name());
            String[] menuItems = getResources().getStringArray(R.array.menu);
            for (int i = 0; i<menuItems.length; i++) {
                menu.add(Menu.NONE, i, i, menuItems[i]);
            }
        }
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        if (getUserVisibleHint()) {
            AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
            int menuItemIndex = item.getItemId();
            Object o = listViewFragment.getItemAtPosition(info.position);
            Channel_Model channelModel = (Channel_Model) o;

            switch (menuItemIndex) {
                // Přehrát program
                case 0:
                    Intent Play_Channel=new Intent(applicationContext,Play_Channel.class);
                    Play_Channel.putExtra("channelModel", channelModel);
                    Play_Channel.putExtra("epgModel", channelModel.getEpg_Model_Now());
                    Play_Channel.putExtra("session", session);
                    Play_Channel.putExtra("from_beginning", false);
                    Play_Channel.putExtra("time_offset", time_offset);
                    //Play_Channel.putExtra("channelListFragment", channelListFragment);
                    Play_Channel.putExtra("position", info.position);
                    startActivityForResult(Play_Channel, 110);
                    break;
                // Přehrát program od začátku
                case 1:
                    Intent Play_Channel_From_Beginning=new Intent(applicationContext,Play_Channel.class);
                    Play_Channel_From_Beginning.putExtra("channelModel", channelModel);
                    Play_Channel_From_Beginning.putExtra("epgModel", channelModel.getEpg_Model_Now());
                    Play_Channel_From_Beginning.putExtra("session", session);
                    Play_Channel_From_Beginning.putExtra("from_beginning", true);
                    Play_Channel_From_Beginning.putExtra("time_offset", time_offset);
                    //Play_Channel.putExtra("channelListFragment", channelListFragment);
                    Play_Channel_From_Beginning.putExtra("position", info.position);
                    startActivityForResult(Play_Channel_From_Beginning, 110);
                    break;
                // Archiv
                case 2:
                    Intent ListArchive = new Intent(applicationContext, ListArchive.class);
                    ListArchive.putExtra("channelModel", channelModel);
                    ListArchive.putExtra("session", session);
                    startActivityForResult(ListArchive, 120);
                    break;
                // Zpět
                case 3 :
                    break;
            }
            return true;
        }
        return false;
    }

    class ListChannelsPagerAdapter extends PagerAdapter {
        private ChannelCountriesModel[] tabTitles;
        private String session;
        private ListView listViewInAdapter;

        public ListChannelsPagerAdapter(String session, ChannelCountriesModel[] tabTitles) {
            this.tabTitles = tabTitles;
            this.session = session;
        }

        @Override
        public int getCount() {
            try {
                return tabTitles.length;
            }
            catch (Exception e) {
                //e.printStackTrace();
                return 0;
            }
        }

        @Override
        public boolean isViewFromObject(View view, Object o) {
            return o == view;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return tabTitles[position].getName();
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            View rootView = getActivity().getLayoutInflater().inflate(R.layout.channels_list_tabs_pager_item, container, false);
            container.addView(rootView);

            listViewInAdapter = (ListView) rootView.findViewById(R.id.channelList);
            listViewInAdapter.requestFocus();

            Channel_Row_Adapter channel_Row_Adapter =  new Channel_Row_Adapter(listViewInAdapter.getContext(), ((ChannelsListTabs)getActivity()).channelsCountriesMap.get(tabTitles[position].getShortcut()), session);
            listViewInAdapter.setAdapter(channel_Row_Adapter);
            registerForContextMenu(listViewInAdapter);

            listViewInAdapter.setOnItemClickListener(new AdapterView.OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> a, View v, int position, long id) {
                    try {
                        listViewFragment = listViewInAdapter;
                        getActivity().openContextMenu(v);
                    } catch (Exception e) {}
                }
            });
            return rootView;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView((View) object);
        }
    }
}

一切看起来都不错，但直到我想使用上下文菜单 - 它是最后创建的列表视图，而不是实际页面。

我该怎么做？

Answer 1

我在PagerAdapter中使用ListView并遇到了与您相同的问题。

当我尝试使用ArrayList将数据传递给ListView Adapter时，我终于发现我使用ArrayList作为全局变量。因此，当程序进入instantiateItem（）时，它将使用相同的ArrayList。

也许它可以帮助你搞清楚。