Question

我正在使用导航栏，其中包含菜单Home，Hospital，Doctors和Restaurant，并使用Fragment将一个片段移动到其他片段，但是当点击Doctor菜单时，应用程序停止了。

MainActivity.java

public class MainActivity extends AppCompatActivity {

    Toolbar toolbar;
    DrawerLayout drawerLayout;
    ActionBarDrawerToggle actionBarDrawerToggle;
    FragmentTransaction fragmentTransaction;
    NavigationView navigationView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        toolbar=(Toolbar)findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        drawerLayout=(DrawerLayout)findViewById(R.id.drawer_layout);
        actionBarDrawerToggle=new ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.drawer_open,R.string.drawer_close);
        fragmentTransaction=getSupportFragmentManager().beginTransaction();
        fragmentTransaction.add(R.id.main_container,new BlankFragment());
        fragmentTransaction.commit();
        getSupportActionBar().setTitle("GApp");

        navigationView=(NavigationView)findViewById(R.id.navigation_view);
        navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(MenuItem item) {
                switch (item.getItemId())
                {
                    case R.id.home:
                         fragmentTransaction=getSupportFragmentManager().beginTransaction();
                        fragmentTransaction.replace(R.id.main_container,new BlankFragment());
                        fragmentTransaction.commit();
                        getSupportActionBar().setTitle("Home");
                        item.setChecked(true);
                        drawerLayout.closeDrawers();
                        break;

                    case R.id.hospital:
                        fragmentTransaction=getSupportFragmentManager().beginTransaction();
                        fragmentTransaction.replace(R.id.main_container,new HospitalFragment());
                        fragmentTransaction.commit();
                        getSupportActionBar().setTitle("Hospitals");
                        item.setChecked(true);
                        drawerLayout.closeDrawers();
                        break;

                    case R.id.doctor:
                        fragmentTransaction=getSupportFragmentManager().beginTransaction();
                        fragmentTransaction.replace(R.id.main_container,new DoctorFragment());
                        fragmentTransaction.commit();
                        getSupportActionBar().setTitle("Doctors");
                        item.setChecked(true);
                        drawerLayout.closeDrawers();
                        break;

                    case R.id.restaurent:
                        fragmentTransaction=getSupportFragmentManager().beginTransaction();
                        fragmentTransaction.replace(R.id.main_container,new restaurent());
                        fragmentTransaction.commit();
                        getSupportActionBar().setTitle("Restaurents");
                        item.setChecked(true);
                        drawerLayout.closeDrawers();
                        break;

                }
                return true;
            }
        });

        drawerLayout.addDrawerListener(actionBarDrawerToggle);
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        actionBarDrawerToggle.syncState();
    }
}

DoctorFragment.java

public class DoctorFragment extends Fragment {
    ListView listView;
    String[] doctors={"Physician","Child Specialist","Dentist","Neurologist"};

    public DoctorFragment() {

    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

       listView=(ListView)getActivity().findViewById(R.id.listview);
       ArrayAdapter adapter=new ArrayAdapter<String>(getActivity(),R.layout.list_view_custom_layout,doctors);
        listView.setAdapter(adapter);

        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_doctor, container, false);
    }

}

那么，这是你的布局吗？

<FrameLayout 
  xmlns:android="schemas.android.com/apk/res/android" 
  xmlns:tools="schemas.android.com/tools" 
   android:layout_width="match_parent" 
   android:layout_height="match_parent" 
   tools:context="com.example.nk.gapp.DoctorFragment">
  <ListView 
     android:id="@+id/listview" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content">
   </ListView> 
</FrameLayout>

Answer 1

尝试对您的片段进行此更改：由于您尚未共享logcat，因此很难指出真正的原因：首先膨胀您的视图，然后按ID查找listview，像往常一样设置适配器，然后最终返回视图

FALSE

不幸的是，“申请”已经停止

1 个答案: