Question

我有两个类。一个是扩展AppcompactActivity的抽象类BaseActivity.java，另一个是扩展Fragment的DrawerFragment.java！如何使BaseActivity类实现NavigationItemSelectedListener并处理此活动中的导航项单击事件！我复制粘贴下面的相关代码：

BaseActivity.java

public abstract class BaseActivity extends AppCompatActivity {
    private static final String TAG = BaseActivity.class.getSimpleName();
    protected Toolbar mToolbar;
    protected DrawerFragment mNavigationDrawerFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(getLayoutResource());
        mToolbar = (Toolbar) findViewById(R.id.toolbar_actionbar);
        setSupportActionBar(mToolbar);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
        getSupportActionBar().setElevation(0);


        // Set navigation drawer 
        mNavigationDrawerFragment = (DrawerFragment) getSupportFragmentManager().findFragmentById(R.id.fragment_drawer);
        mNavigationDrawerFragment.setNavig((DrawerLayout) findViewById(R.id.drawer), mToolbar);

}

Drawer Fragment.java

public class DrawerFragment extends Fragment{

    private NavigationView navigView;
    private Activity activity;
    private static final String TAG = "NavigationDrawer";
    private DrawerLayout drawerLayout;
    private TextView fullNameTextView;
    private ImageView profileImage;


    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view= inflater.inflate(R.layout.navigation_drawer_fragment, container, false);
        navigView=(NavigationView)view.findViewById(R.id.main_drawer);

//      Inflating nav_header layout on top of navigation drawer layout
        View temp=getActivity().getLayoutInflater().inflate(R.layout.nav_header,navigView,false);
        navigView.addHeaderView(temp);
        profileImage= (ImageView) temp.findViewById(R.id.profile_image);
        fullNameTextView= (TextView) temp.findViewById(R.id.fullNameTextView);
        return view;
    }

    public void setNavig(DrawerLayout drawerLayout, Toolbar toolbar) {
        ActionBarDrawerToggle drawerToggle=new ActionBarDrawerToggle(activity, drawerLayout,toolbar, R.string.drawer_open, R.string.drawer_close);
        drawerLayout.setDrawerListener(drawerToggle);
        drawerToggle.syncState();
        this.drawerLayout=drawerLayout;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        activity=getActivity();

    }

}

我知道如何在DrawerFragment.java类上实现项目点击监听器并在那里处理事件。但它不是我想要的。我打算从BaseActivity.java类

做同样的事情

Answer 1

//MAKE A PUBLIC METHOD IN THE NAVIGATION VIEW THAT RETURNS NAVIGATION VIEW
//in DrawerFragment
public NavigationView getNav(){

   return navView;
}


//use that public method from baseactivity.java and set listener on the obtained object
getNav().setNavigationItemSelectedListener(this);

但最好的方法是在导航抽屉上实现监听器片段本身。因为它使导航抽屉完整并与BaseActivity（或任何其他类）分离。或者你可以这样做，如下面的使用接口机制：

//INSIDE FragmentDrawer
//Let FragmentDrawer Implement OnItemSelectedListener

//then you need to override onItemSelected() method
@Override
public void OnItemSelected(int pos){

  //Call The method implemented on your Activity using interface
  communicator.displayItem(pos);

 //where communicator has reference to your activity and dispayItem() is implemented method

}

如何设置NavigationDrawer项目单击监听器？

1 个答案: