Question

我正在实施一个应用，用户可以在单独的标签中搜索某些歌曲。歌曲的搜索结果是歌词，含义等信息。从结果中，用户可以将某些歌曲标记为另一个标签中的收藏。当我点击收藏的歌曲选项卡时，它应切换到带有搜索结果片段的第一个选项卡。以下是更具体的细节：

主要活动产生操作栏，创建2个标签。
搜索标签 - 单独的片段，结果 - 单独的片段

收藏夹标签 - 单独的片段

public class TabsListener<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 TabsListener(Activity activity, String tag, Class<T> clz) {
    mActivity = activity;
    mTag = tag;
    mClass = clz;
}

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

@SuppressLint("NewApi")
public void onTabSelected(Tab tab, FragmentTransaction ft) {
    // 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());
        ft.add(android.R.id.content, mFragment, mTag);
    } else {
        // If it exists, simply attach it in order to show it
        ft.attach(mFragment);
    }
}

@SuppressLint("NewApi")
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    if (mFragment != null) {
        // Detach the fragment, because another one is being attached
        ft.detach(mFragment);
        //ft.remove(mFragment);
    }
}

@SuppressLint("NewApi")
public void onTabReselected(Tab tab, FragmentTransaction ft) {
        ft.attach(mFragment);
    // User selected the already selected tab. Usually do nothing.
}

}

如何以编程方式为Action Bar实现从一个选项卡切换到另一个选项卡？

操作栏自动切换标签：

0 个答案: