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我想知道导航选项卡是在操作栏内还是在其下方。在第一种（无效）方法中，我假设操作栏在横向操作栏内，在纵向操作栏下方。这是测试活动代码：

public class TabTestActivity extends FragmentActivity implements
        ActionBar.TabListener {

    SectionsPagerAdapter mSectionsPagerAdapter;
    ViewPager mViewPager;
    private AlertDialog.Builder dialogBuilder;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tab_test);
        dialogBuilder = new AlertDialog.Builder(this);
        dialogBuilder.setTitle("Tabs inside or below action bar?");
        dialogBuilder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
            }
        });
        final ActionBar actionBar = getActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        mSectionsPagerAdapter = new SectionsPagerAdapter(
                getSupportFragmentManager());
        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mSectionsPagerAdapter);
        mViewPager
                .setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
                    @Override
                    public void onPageSelected(int position) {
                        actionBar.setSelectedNavigationItem(position);
                    }
                });

        for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
            actionBar.addTab(actionBar.newTab()
                    .setText(mSectionsPagerAdapter.getPageTitle(i))
                    .setTabListener(this));
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.tab_test, menu);
        return true;
    }

    @Override
    public void onTabSelected(ActionBar.Tab tab,
            FragmentTransaction fragmentTransaction) {
        mViewPager.setCurrentItem(tab.getPosition());
        AlertDialog notifyTabsLocationDialog = dialogBuilder.create();
        // First approach: assume that tabs are inside action bar in landscape
        // and below action bar in landscape, but they are always inside action
        // bar for my tablet
        if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
            notifyTabsLocationDialog.setMessage("Tabs below action bar");
        } else {
            notifyTabsLocationDialog.setMessage("Tabs inside action bar");            
        }
        notifyTabsLocationDialog.show();
    }

    @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) {
            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() {
            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;
        }
    }

    public static class DummySectionFragment extends 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_tab_test_dummy,
                    container, false);
            TextView dummyTextView = (TextView) rootView
                    .findViewById(R.id.section_label);
            dummyTextView.setText(Integer.toString(getArguments().getInt(
                    ARG_SECTION_NUMBER)));
            return rootView;
        }

    }

}
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2 回答 2

1

来自 ActionBar 指南：添加导航选项卡

ActionBar 提供的选项卡非常理想，因为它们适应不同的屏幕尺寸。例如，当屏幕足够宽时，选项卡会出现在操作按钮旁边的操作栏中（例如在平板电脑上时，如图 7 所示），而在窄屏幕上时，它们会出现在单独的栏中（称为“堆叠的动作栏”，如图 8 所示）。在某些情况下，Android 系统会将您的选项卡项显示为下拉列表，以确保最适合操作栏。

是的，你的假设是正确的。但参数不是纵向或横向，而是有足够的空间或没有足够的空间将选项卡与操作栏合并。

于 2013-10-24T02:21:37.727 回答
0

我发现了一个使用反射来访问布尔字段mHasEmbeddedTabs的workaraound ActionBar：

Class<?> actionBarClass = getActionBar().getClass();
Field mHasEmbeddedTabs = actionBarClass.getDeclaredField("mHasEmbeddedTabs");
mHasEmbeddedTabs.setAccessible(true);
if (mHasEmbeddedTabs.getBoolean(getActionBar())) {
    notifyTabsLocationDialog.setMessage("Tabs inside action bar");            
} else {
    notifyTabsLocationDialog.setMessage("Tabs below action bar");
}
于 2013-10-26T14:46:38.297 回答