安卓: "Navigation Type: Fixed Tabs + Swipe"

Question

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”。

现在 ADT 吐出漂亮的代码，我稍微修改了一下...

我完全理解代码以及发生了什么......但是我如何才能教应用程序使用我的三个 fragment 而不是愚蠢的虚拟 fragment ？ :(

我找不到任何处理 ADT“导航类型”的教程...

感谢您的帮助!

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;
    }
}
}

Answer 1

设置 fragment 的 switch-case 很简单，而且非常清楚。让你的每个 fragment 在你的 xml 中膨胀 Root View

@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;
}