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我正在使用带有 ListView 作为菜单的 SlidingMenu，并且我想根据 ListView 元素的单击动态更改 MainActivity 的内容。我知道我必须使用 Fragments 来实现这一点。

我有一个 PlayerFragment 里面什么都没有：

public class PlayerFragment extends Fragment {

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
        Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.activity_player_fragment, container, false);
    }

}

我的标准 MainActivity 里面有一个 SlidingMenu：

public class MainActivity extends SlidingFragmentActivity {

private ListView mainListView;
private ArrayAdapter<String> listAdapter;
private SlidingMenu menu;
protected ListFragment mFrag;

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




    menu = new SlidingMenu(this);
    menu.setMode(SlidingMenu.LEFT);
    menu.setTouchModeAbove(SlidingMenu.TOUCHMODE_FULLSCREEN);
    menu.setShadowWidth(8);
    menu.setFadeDegree(0.8f);
    menu.attachToActivity(this, SlidingMenu.SLIDING_CONTENT);
    menu.setBehindWidth(600);
    menu.setMenu(R.layout.menu_frame);

    mainListView = (ListView) findViewById(R.id.listView1);

    String[] planets = new String[] { "News", "Android", "Control",
            "About" };
    ArrayList<String> planetList = new ArrayList<String>();
    planetList.addAll(Arrays.asList(planets));

    listAdapter = new ArrayAdapter<String>(this,
            R.layout.custom_list_element, R.id.title, planetList);

    mainListView.setAdapter(listAdapter);
    mainListView.setSelector(R.layout.listselector);

    mainListView
            .setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) {
                    String item = String.valueOf(mainListView
                            .getItemAtPosition(position));

                }
            });



}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public void onBackPressed() {
    if (menu.isMenuShowing()) {
        menu.toggle();
    } else {
        super.onBackPressed();
    }
}

}

应用启动时如何调用标准片段？以及如何根据 ListView 的点击更改片段？

我想到了这样的事情：

   if (fragment == null) {

           FragmentTransaction ft = fm.beginTransaction();
           ft.add(R.id.RELATIVEVIEW_ID_HERE, new BasicFragment());
           ft.commit(); 
   }

并更改片段：

Fragment fg = NewsFragment.newInstance();
getFragmentManager().beginTransaction().add(R.id.RELATIVEVIEW_ID_HERE, fg).commit();

它是否正确？

提前致谢！

4

1 回答 1

2

您可以使用ft.replace(...)所有Fragment更改，包括显示第一个更改，如下所示：

FragmentTransaction ft = fm.beginTransaction();
MyFragment myFragment = myFragment.newInstance();
ft.replace(android.R.id.content, myFragment).commit();
于 2013-06-08T22:15:37.217 回答