ActionBar选项卡带有支持库

Question

我遇到的问题是Action Bar不会在Android 2.3.7上显示,但在4.x +上可以正常工作.我的应用程序的其余部分与支持v7和v4库工作正常,只是这一个区域给我带来了麻烦.

这是它应该是什么样子,如4.3所示:

以下是2.3.7的内容:

在我的onCreate方法(继承自ActionBarActivity的类)中,我有:

    // setup action bar for tabs
    ActionBar actionBar = getSupportActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    actionBar.setDisplayHomeAsUpEnabled(true);
    actionBar.setDisplayShowTitleEnabled(true);


    Tab tab = actionBar.newTab()
            .setText(R.string.details)
            .setTabListener(new TabListener<DetailsFragmentOne>(
                    this, "one", DetailsFragmentOne.class));
    actionBar.addTab(tab);

    tab = actionBar.newTab()
        .setText(R.string.grades)
        .setTabListener(new TabListener<DetailsFragmentTwo>(
                this, "one", DetailsFragmentTwo.class));
    actionBar.addTab(tab);

这是我的TabListener,一个内部类:

/**
 * This is copied almost verbatim from <a href="http://developer.android.com/guide/topics/ui/actionbar.html#Tabs">the ActionBar Tabs API Guide</a>.
 * @param <T>
 */
public class TabListener<T extends Fragment> implements ActionBar.TabListener {
    private Fragment mFragment;
    private final Activity mActivity;
    private final String mTag;
    private final Class<T> mClass;

    /** Constructor used each time a new tab is created.
      * @param activity  The host Activity, used to instantiate the fragment
      * @param tag  The identifier tag for the fragment
      * @param clz  The fragment's Class, used to instantiate the fragment
      */
    public TabListener(Activity activity, String tag, Class<T> clz) {
        mActivity = activity;
        mTag = tag;
        mClass = clz;
    }

    /* The following are each of the ActionBar.TabListener callbacks */

    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        FragmentTransaction sft = ((FragmentActivity) mActivity).getSupportFragmentManager().beginTransaction();
        mFragment = getSupportFragmentManager().findFragmentByTag(mTag);
        // Check if the fragment is already initialized
        if (mFragment == null) {
            // If not, instantiate and add it to the activity
            mFragment = Fragment.instantiate(mActivity, mClass.getName());
            // calling commit() here because we're not using the provided FragmentTransaction
            sft.replace(android.R.id.content, mFragment, mTag).commit();
        } else {
            // If it exists, simply attach it in order to show it
            // calling commit() here because we're not using the provided FragmentTransaction
            sft.replace(android.R.id.content, mFragment).commit();
        }
    }

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        FragmentTransaction sft = ((FragmentActivity) mActivity).getSupportFragmentManager().beginTransaction();
        mFragment = getSupportFragmentManager().findFragmentByTag(mTag);
        if (mFragment != null) {
             // calling commit() here because we're not using the provided FragmentTransaction
            sft.replace(android.R.id.content, mFragment).commit();
        }
    }

    public void onTabReselected(Tab tab, FragmentTransaction ft) {          
        FragmentTransaction sft = ((FragmentActivity) mActivity).getSupportFragmentManager().beginTransaction();
        mFragment = getSupportFragmentManager().findFragmentByTag(mTag);
        if (mFragment != null) {
             // calling commit() here because we're not using the provided FragmentTransaction
            sft.replace(android.R.id.content, mFragment).commit();
        }
    }

}

我已经看到了这两个问题,并试图实现答案,但我仍然遇到了这个问题.

• 使用支持库实现TabListener

• 使用v4 Fragments API实现ActionBar选项卡

编辑:根据要求,正在应用的主题只是支持库的AppCompat.Light.DarkActionBar主题,没有覆盖,如下所示:

<style name="Theme.MyTheme" parent="@style/Theme.AppCompat.Light.DarkActionBar">
</style>

Answer 1

如果删除DetailFragment的背景,则ActionBar和Tabs实际显示在DetailFragment后面.而不是android.R.id.content,在主布局中创建自己的容器,并在FragmentTransaction中调用replace时使用R.id.yourcontent.通过进行此更改,它在2.3.3和4+上对我有用.

似乎2.3.3将ActionBar添加到根视图元素,其中4+将其添加到根视图之外.

sft.replace(R.id.yourcontent, mFragment).commit();