集片段作爲活動佈局開始

Question

MainActivity.java：

public class MainActivity extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     if (savedInstanceState == null) { 
      getFragmentManager().beginTransaction() 
        .add(R.id.container, new homePage()) 
        .commit(); 
     } 
    } 
} 

這是我得到的錯誤：

無法解析方法添加（INT等）上添加一行（R.id.container，new homePage（））

所以基本上我創建了三個片段和一個活動。我的活動沒有佈局（儘管它顯然有一個佈局頁面，它的ID是容器）。我想在活動啓動時將homePage佈局文件添加到容器，但這似乎不起作用。到目前爲止，我只創建了佈局等，現在我試圖添加java代碼，但我不確定爲什麼這不起作用。

我還沒有編輯任何片段的java代碼，所以它基本上是android studio在創建時添加的代碼。

public class homePage extends Fragment { 

    private OnFragmentInteractionListener mListener; 
    private View view; 

    public homePage() { 
     // Required empty public constructor 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     view = inflater.inflate(R.layout.fragment_home_page, container, false); 
     Button btnLogin = (Button) view.findViewById(R.id.login); 
     btnLogin.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       loginView(); 
      } 
     }); 
     return view; 
    } 

    public static homePage newInstance() { 
     homePage fragment = new homePage(); 
     Bundle args = new Bundle(); 
     return fragment; 
    } 

    public void loginView(){} 

    @Override 
    public void onAttach(Context context) { 
     super.onAttach(context); 
     if (context instanceof OnFragmentInteractionListener) { 
      mListener = (OnFragmentInteractionListener) context; 
     } else { 
      throw new RuntimeException(context.toString() 
        + " must implement OnFragmentInteractionListener"); 
     } 
    } 

    @Override 
    public void onDetach() { 
     super.onDetach(); 
     mListener = null; 
    } 

    /** 
    * This interface must be implemented by activities that contain this 
    * fragment to allow an interaction in this fragment to be communicated 
    * to the activity and potentially other fragments contained in that 
    * activity. 
    * <p/> 
    * See the Android Training lesson <a href= 
    * "http://developer.android.com/training/basics/fragments/communicating.html" 
    * >Communicating with Other Fragments</a> for more information. 
    */ 
    public interface OnFragmentInteractionListener { 
     // TODO: Update argument type and name 
     void onFragmentInteraction(Uri uri); 
    } 
} 

Answer 1

這可能是因爲您homeFragment從支持庫（android.support.v4.app.Fragment）擴展了Fragment，因此您的MainActivity應該使用getSupportFragmentManager()代替getFragmentManager()這是android.app.Fragment的一部分。