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嘿嘿。我正在尝试在 ActionBar 导航(带有片段)中实现选项卡导航,但我无法让它工作!这可能吗?如果不是,那会很好奇...

在此处输入图像描述 .

这是我已经得到的:

MainActivity.java

...
import android.app.Fragment;
import android.app.FragmentTransaction;

public class MainActivity extends Activity {

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

        ActionBar bar = getActionBar();
        bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        Fragment fragmentA = new FragmentA();
        ActionBar.Tab tabFragmentA = bar.newTab().setText("FragmentA");   
        tabFragmentA.setTabListener(new MyTabListener(fragmentA));
        bar.addTab(tabFragmentA);

        Fragment fragmentB = new FragmentB();
        ActionBar.Tab tabFragmentB = bar.newTab().setText("FragmentB");   
        tabFragmentB.setTabListener(new MyTabListener(fragmentB));
        bar.addTab(tabFragmentB);

        bar.setDisplayShowTitleEnabled(false); // remove top title bar
        bar.setDisplayShowHomeEnabled(false); 
    }

    public class MyTabListener implements TabListener {

        private Fragment fragment;

        public MyTabListener(Fragment fragment) {
            this.fragment = fragment;
        }

        @Override
        public void onTabSelected(Tab arg0, FragmentTransaction ft) {
            ft.replace(R.id.fragmentContainer, fragment);   
        }

        @Override
        public void onTabUnselected(Tab arg0, FragmentTransaction ft) {
        }

        @Override
        public void onTabReselected(Tab arg0, FragmentTransaction ft) {
        }
    }
}

我从 v4 支持 api 中尝试了 FragmentTabHost,但是当我使用这个时,当我想实例化 Fragment 时,我在 MainActivity 中得到一个 classcasterror。当我还将 MainActivity 中的 Fragment 导入更改为支持 api 时,我的 tablistener 不再工作了。那么……我该怎么办?还有其他建议吗?

片段A.java

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTabHost;

public class FragmentA extends Fragment {

    @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        View view = inflater.inflate(R.layout.fragment_a, container, false);

        FragmentTabHost mTabHost = new FragmentTabHost(getActivity());
        mTabHost.setup(getActivity(), getChildFragmentManager(), R.id.fragmentAContainer);

        return view;
    }

}

谢谢你的帮助!

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0 回答 0