Question

我想在每个标签中设置不同的内容。我是android的新手。如何更改代码以便管理每个选项卡的内容？

我所拥有的：

enter image description here

问题是我在每个标签上都有相同的内容。

这是MainActivity：

public class MainActivity extends ActionBarActivity implements ActionBar.TabListener
{

SectionsPagerAdapter mSectionsPagerAdapter;

/**
 * The {@link ViewPager} that will host the section contents.
 */
ViewPager mViewPager;

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);

    // Here we load the xml layout we created above
    setContentView(R.layout.activity_main);

    // Set up the action bar.
    final ActionBar actionBar = getSupportActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    // Create the adapter that will return a fragment for each of the three
    // primary sections of the activity.
    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

    // Set up the ViewPager with the sections adapter.
    mViewPager = (ViewPager) findViewById(R.id.pager);
    mViewPager.setAdapter(mSectionsPagerAdapter);

    // When swiping between different sections, select the corresponding
    // tab. We can also use ActionBar.Tab#select() to do this if we have
    // a reference to the Tab.
    mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener()
    {
        @Override
        public void onPageSelected(int position)
        {
            actionBar.setSelectedNavigationItem(position);
        }
    });

    // For each of the sections in the app, add a tab to the action bar.
    for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++)
    {
        // Create a tab with text corresponding to the page title defined by
        // the adapter. Also specify this Activity object, which implements
        // the TabListener interface, as the callback (listener) for when
        // this tab is selected.
        actionBar.addTab(
                actionBar.newTab()
                        .setText(mSectionsPagerAdapter.getPageTitle(i))
                        .setTabListener(this));
    }
}

其余代码在MainActivity内内部：

 @Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction)
{
    // When the given tab is selected, switch to the corresponding page in
    // the ViewPager.
    mViewPager.setCurrentItem(tab.getPosition());
}

班级SectionPagerAdapter：

public class SectionsPagerAdapter extends FragmentPagerAdapter
{

    public SectionsPagerAdapter(FragmentManager fm)
    {
        super(fm);
    }

    @Override
    public Fragment getItem(int position)
    {
        // getItem is called to instantiate the fragment for the given page.
        // Return a PlaceholderFragment (defined as a static inner class below).
        return new PlaceholderFragment();
    }

    @Override
    public int getCount()
    {
        // Show 3 total pages.
        return 3;
    }

    @Override
    public CharSequence getPageTitle(int position)
    {
        Locale l = Locale.getDefault();
        switch (position)
        {
            case 0:
                return getString(R.string.title_section1).toUpperCase(l);
            case 1:
                return getString(R.string.title_section2).toUpperCase(l);
            case 2:
                return getString(R.string.title_section3).toUpperCase(l);
        }
        return null;
    }
}

PlaceholderFragment包含gridview：

public class PlaceholderFragment extends Fragment
{
    /**
     * The fragment argument representing the section number for this
     * fragment.
     */
    private static final String ARG_SECTION_NUMBER = "section_number";

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);

        // Here we inflate the layout we created above
        GridView gridView = (GridView) rootView.findViewById(R.id.gridview);
        gridView.setAdapter(new MyAdapter(MainActivity.this.getApplicationContext()));

        return rootView;
    }
}

和MyAdapter我在其中添加了项目内容：

private class MyAdapter extends BaseAdapter
{
    private List<Item> items = new ArrayList<Item>();
    private LayoutInflater inflater;

    public MyAdapter(Context context)
    {
        inflater = LayoutInflater.from(context);

        items.add(new Item("APO Supreme", R.drawable.snb_apo_supreme));
        items.add(new Item("Arbor Blacklist", R.drawable.snb_arbor_blacklist));
        items.add(new Item("Arbor Draft", R.drawable.snb_arbor_draft));
        items.add(new Item("Arbor Relapse", R.drawable.snb_arbor_relapse));
        items.add(new Item("Capita Defenders of Awesome", R.drawable.snb_capita_defenders_of_awesome));
        items.add(new Item("Capita Outsiders", R.drawable.snb_capita_outsiders));
        items.add(new Item("Capita Ultrafear", R.drawable.snb_capita_ultrafear));
        items.add(new Item("DC Focus", R.drawable.snb_dc_focus));
        items.add(new Item("DC Mega", R.drawable.snb_dc_mega));
        items.add(new Item("DC Tone", R.drawable.snb_dc_tone));
        items.add(new Item("ROME Agent", R.drawable.snb_rome_agent));
        items.add(new Item("ROME Agent Rocker", R.drawable.snb_rome_agent_rocker));
        items.add(new Item("ROME Hammerhead", R.drawable.snb_rome_hammerhead));

    }

    @Override
    public int getCount() {
        return items.size();
    }

    @Override
    public Object getItem(int i)
    {
        return items.get(i);
    }

    @Override
    public long getItemId(int i)
    {
        return items.get(i).picId;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup)
    {
        View v = view;
        ImageView picture;
        TextView name;

        if(v == null)
        {
            v = inflater.inflate(R.layout.gridview_item, viewGroup, false);
            v.setTag(R.id.picture, v.findViewById(R.id.picture));
            v.setTag(R.id.text, v.findViewById(R.id.text));
        }

        picture = (ImageView)v.getTag(R.id.picture);
        name = (TextView)v.getTag(R.id.text);

        Item item = (Item)getItem(i);

        picture.setImageResource(item.picId);
        name.setText(item.name);

        return v;
    }

    private class Item
    {
        final String name;
        final int picId;

        Item(String name, int drawableId)
        {
            this.name = name;
            this.picId = drawableId;
        }
    }
}

我知道它非常混乱且代码很多here's folder with project

P.S。我在Android Studio中工作

感谢您的帮助

Answer 1

我认为你的问题是

@Override
    public Fragment getItem(int position)
    {
        // getItem is called to instantiate the fragment for the given page.
        // Return a PlaceholderFragment (defined as a static inner class below).
        return new PlaceholderFragment();
    }

ViewPager必须从每个页面项返回不同的片段。

创建三个片段并为每个片段使用相同的布局。然后将这些片段放入ArrayList并返回getItem方法所需的片段，取决于位置编号。

编辑：例如：

private List<Fragment> mFragments = new Vector<Fragment>();

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_fragment_activity_layout);        
    mFragments.add(new FirstFragment());
    mFragments.add(new SecondFragment());
    ...
    ...
}

在SectionsPagerAdapter中使用

    @Override
    public Fragment getItem(int position)
    {
      // getItem is called to instantiate the fragment for the given page.
      // Return a PlaceholderFragment (defined as a static inner class below).
      return mFragments.get(position);
    }

然后在FirstFragment和SecondFragment和其他片段中使用R.layout.activity_main

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle    savedInstanceState) {
    View v = inflater.inflate(R.layout.activity_main, container, false);
    GridView gridView = (GridView) v.findViewById(R.id.gridview);
    return v;
}

现在每个片段中的onResume（）方法在适配器中使用不同的自定义内容

public void onResume(){
   gridView.setAdapter(new MyAdapter(getActivity())); 
   }

您应该为每个gridView使用自定义适配器来显示不同的信息，或者您可以传递适配器不同的内容。阅读有关适配器以及如何将数据内容传递到其中的更多信息。

标签内的不同内容

1 个答案: