安卓 - 导航抽屉片段

Question

我在我的安卓应用程序中实现了导航抽屉。但现在我想在用户单击导航栏中的任何列表项时使用片段更改布局。 这是我目前所拥有的： XML

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:background="#000000"
        android:layout_height="match_parent" >       
    </FrameLayout>

    <ListView android:id="@+id/left_drawer"
        android:layout_width="220dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:choiceMode="singleChoice"
        android:divider="@android:color/transparent"
        android:dividerHeight="0dp"
        android:background="#111"/>
</android.support.v4.widget.DrawerLayout>

Java 文件

public class MainActivity extends Activity {
final String[] data ={"one","two","three"};

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

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, data);

    final DrawerLayout drawer = (DrawerLayout)findViewById(R.id.drawer_layout);
    final ListView navList = (ListView) findViewById(R.id.left_drawer);
    navList.setAdapter(adapter);
    navList.setOnItemClickListener(new AdapterView.OnItemClickListener(){
        @Override
        public void onItemClick(AdapterView<?> parent, View view, final int pos,long id){
            drawer.setDrawerListener( new DrawerLayout.SimpleDrawerListener(){
                @Override
                public void onDrawerClosed(View drawerView){
                    super.onDrawerClosed(drawerView);

                }
            });
            drawer.closeDrawer(navList);
        }
    });
  }
}

使用上述代码，我在我的应用程序中实现了导航抽屉，我在导航抽屉中看到了“one”，“two”和“Three”列表项，但是当我单击它们时除了抽屉关闭之外什么也不发生。 因此，我的问题是： 如何将片段功能添加到上面给出的代码中？ 我是初学者。提前致谢！

- Chinmay Dabke

---

你必须通过FragmentActivity来完成这个任务。 - Kishan Dhamat

@kishandhamat 为什么这样？ - Raghunandan

Answer 1

点击触发

  selectItem(pos);

那么，

public void selectItem(int position)
{
     switch(position)
     {
          case 0:
                     // fragment1
                     // use fragment transaction and add the fragment to the container
                     FragmentManager fragmentManager = getFragmentManager()
                     FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();   
                     Fragment1 fragment = new Fragment1();
                     fragmentTransaction.add(R.id.content_frame, fragment);
                     fragmentTransaction.commit();

          break;
          case 1:
                     // fragment2
          break; 
          case 2:
                     // fragment2
          break;
     } 
}

- Raghunandan

---

在“drawer.closeDrawer(navList);”之后，我应该放置“selectItem(pos);”吗？ - Chinmay Dabke

@ChinmayDabke，为什么你在onclick中有drawee代码？请删除它。在switch case关闭drawer后，只选择selectItem(pos)。 - Raghunandan

好的。但它会关闭抽屉吗？ - Chinmay Dabke

@ChinmayDabke，文档中有一个示例。看一下吧。下载地址：http://developer.android.com/training/implementing-navigation/nav-drawer.html - Raghunandan

让我们在聊天中继续这个讨论：http://chat.stackoverflow.com/rooms/44998/discussion-between-chinmay-dabke-and-raghunandan - Chinmay Dabke

Answer 2

使用这个：

public class MenuFragmentActivity extends FragmentActivity{
@Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.base_layout);
    addFragments(new Sample(), false, false,
            AndyConstants.CONTENT_PAGE);
     }

    public void addFragments(Fragment fragment, boolean animate,
        boolean addToBackStack, String tag) {

    FragmentManager manager = getSupportFragmentManager();
    FragmentTransaction ft = manager.beginTransaction();
    if (animate) {
         ft.setCustomAnimations(R.anim.fragment_from_right,
         R.anim.fragment_from_left, R.anim.fragment_from_right,
         R.anim.fragment_from_left);
    }
    if (addToBackStack) {
        ft.addToBackStack(tag);
    }
    ft.replace(R.id.content_frame, fragment);
    ft.commit();
}

}

For Fragment:

public class Sample extends Fragment {
@Override
public void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
}
    @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
    Bundle savedInstanceState) {
        // TODO Auto-generated method stub
            View view = inflater.inflate(R.layout.page, container, false);
        return view;
    }
    }

- Kishan Dhamat

---

不需要扩展FragmentActivity。如果您支持11以下的导航栏，则需要使用AppCompat。需要扩展ActionBarActivity。 - Raghunandan

根据问题，可以很容易地通过FragmentActivity完成。 - Kishan Dhamat

这是一个导航抽屉。 - Raghunandan

Answer 3

通过在文件->新建->活动->导航抽屉活动中生成一个导航抽屉活动，这里有3个步骤。

第一步，进入app_bar_main.xml，然后

将

<include layout="@layout/content_main"/>

替换为

<FrameLayout
        android:id="@+id/frame_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        />

其次，前往MainActivity的onNavigationItemSelected方法并进行修改，如下所示。

public boolean onNavigationItemSelected(@NonNull MenuItem item) {
    int id = item.getItemId();
    Fragment fragment = null;
    if (id == R.id.nav_camera) {
        fragment = CameraFragment.newInstance();
    } else if (id == R.id.nav_gallery) {
        fragment = GalleryFragment.newInstance();
    } else if (id == R.id.nav_slideshow) {
        fragment = SlideShowFragment.newInstance();
    }

    FragmentManager fragmentManager = getSupportFragmentManager();
    fragmentManager.beginTransaction().replace(R.id.frame_content, fragment).commit();

    setTitle(item.getTitle());

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}

最后，创建Fragment类，例如一个片段

public class CameraFragment extends Fragment{

    public static CameraFragment newInstance() {
         Bundle args = new Bundle();
         CameraFragment fragment = new CameraFragment();
        fragment.setArguments(args);
        return fragment;
    }

    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
            @Nullable Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_camera, null, false);
        return rootView;
    }
}

演示项目

- Linh