3

我正在尝试在应用程序中使用 Tabs + Swipe，并希望使用 ADT 在创建 Activity 时为我提供的导航类型“Fixed Tabs + Swipe”。

Sooo 现在 ADT 吐出了漂亮的代码，我稍微修改了一下......

我完全理解代码和发生了什么......但是我怎样才能教应用程序使用我的三个片段而不是愚蠢的虚拟片段？:(

我找不到任何处理 ADT“导航类型”的教程......

谢谢你的帮助！

public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

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

    // Create the adapter that will return a fragment for each of the three
    // primary sections of the app.
    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);
                }
            });
    //Adding Tabs
        actionBar.addTab(actionBar.newTab().setText("Tab 1").setTabListener(this));
        actionBar.addTab(actionBar.newTab().setText("Tab 2").setTabListener(this));
        actionBar.addTab(actionBar.newTab().setText("Tab 3").setTabListener(this));
}

@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());
}

@Override
public void onTabUnselected(ActionBar.Tab tab,FragmentTransaction fragmentTransaction) {
}

@Override
public void onTabReselected(ActionBar.Tab tab,FragmentTransaction fragmentTransaction) {
}

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 DummySectionFragment (defined as a static inner class
        // below) with the page number as its lone argument.
        Fragment fragment = new DummySectionFragment();
        Bundle args = new Bundle();
        args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
        fragment.setArguments(args);
        return fragment;
    }

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

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

    public DummySectionFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main_dummy,container, false);
        TextView dummyTextView = (TextView) rootView.findViewById(R.id.section_label);
        dummyTextView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER)));
        return rootView;
    }
}
}
4

2 回答 2

5

设置片段的开关盒很容易，并且非常清晰。让您的每个片段膨胀您的 xml 中的根视图

@Override
public Fragment getItem(int index) {

    Fragment fragment = null;
    switch(index){
    case 0:
         fragment = new Fragment1();
         break;
    case 1:
         fragment = new Fragment2();
         break;
    case 2:
         fragment = new Fragment3();
         break;
    default:
        break;
    }

    //set args if necessary (which it isn't?)
    Bundle args = new Bundle();
    args.putInt(ObjectFragment.ARG_OBJECT, index + 1);
    fragment.setArguments(args);

    //return fragment
    return fragment;
}
于 2013-07-11T12:23:06.303 回答
3

但是我怎样才能教 App 使用我的三个 Fragment 而不是愚蠢的 Dummy Frag？

您会注意到在以下DummySectionFragment内容中引用getItem()了它SectionsPagerAdapter：

@Override
public Fragment getItem(int position) {
    // getItem is called to instantiate the fragment for the given page.
    // Return a DummySectionFragment (defined as a static inner class
    // below) with the page number as its lone argument.
    Fragment fragment = new DummySectionFragment();
    Bundle args = new Bundle();
    args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
    fragment.setArguments(args);
    return fragment;
}

如果您想使用不同的片段，请修改getItem()以返回您想要的片段，给定提供的position（从 0 开始的页码）。

于 2013-03-23T19:27:41.097 回答