同じアクティビティと同じ画面の2つのフラグメント

Question

私はアプリケーションを作成しています。私はログインページを持っています。ログイン後、firebaseから収集されたユーザリストを表示しています。ユーザをクリックすると、チャット画面が表示されます。私はこれをフラグメントを使用して行っています。私はUsersListFragment.javaとChatFragment.javaを有し、活性はHomeActivity.javaである。

私のアプリケーションは、携帯電話のために完全に動作します。私は今もタブレット用にしようとしています。電話の場合、私はユーザーリストを表示し、別の画面でチャットしています。しかし、タブレットの場合は、両方を同じ画面に表示したいと思っています。ユーザーをクリックすると、そのユーザーの対応するチャットが別の断片に表示されます。

私はこれをすべて参照しました。しかし、まだ私はどのように進めるべきかを知ることができません。

1）https://developer.android.com/training/basics/fragments/fragment-ui.html#AddAtRuntime

2）https://developer.android.com/training/basics/fragments/communicating.html#Deliver

3）https://developer.android.com/guide/components/fragments.html#CommunicatingWithActivity

4）参照用http://www.vogella.com/tutorials/AndroidFragments/article.html

コード。

actvity_home.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:orientation="horizontal" 
android:background="#FFFFFF" 
tools:context=".Activity.HomeActivity"> 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="0dp" 
    android:layout_height="match_parent" 
    android:id="@+id/framecontainerMain" 
    android:layout_weight="1" 
    android:orientation="horizontal" 
    > 
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="0dp" 
    android:layout_height="match_parent" 
    android:id="@+id/framecontainer" 
    android:layout_gravity="left" 
    android:layout_weight="0.5" 
    android:orientation="horizontal" 
    > 

</FrameLayout> 

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="0dp" 
    android:layout_height="match_parent" 
    android:id="@+id/framecontainerTab" 
    android:layout_weight="0.5" 
    android:layout_gravity="right" 
    android:orientation="horizontal" 
    > 

</FrameLayout> 
</LinearLayout> 


</LinearLayout> 

HomeActivity.java

DisplayMetrics displaymetrics = new DisplayMetrics(); 
    getWindowManager().getDefaultDisplay().getMetrics(displaymetrics); 
    int height = displaymetrics.heightPixels; 
    int width = displaymetrics.widthPixels; 
    Log.d(TAG,String.valueOf(height)); 
    if (width > 1023 || height > 1184){ 
     //code for big screen (like tablet) 

     FrameLayout layout1 = (FrameLayout) findViewById(R.id.framecontainer); 
     layout1.setVisibility(View.VISIBLE); 

     FrameLayout layout2 = (FrameLayout) findViewById(R.id.framecontainerTab); 
     layout2.setVisibility(View.VISIBLE); 

     mItemsFragment = new UsersListFragment(); 
     mItemsFragment.initlizeval(this); 

     android.support.v4.app.FragmentTransaction fts = getSupportFragmentManager().beginTransaction(); 
     fts.add(R.id.framecontainer, mItemsFragment).commit(); 

     //Instantiate some stuff here like view components 
     Fragment fragmentOne = new ChatFragment(); 
     android.support.v4.app.FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 

     ft.add(R.id.framecontainerTab, fragmentOne).commit(); 


    }else{ 
     FrameLayout layout1 = (FrameLayout) findViewById(R.id.framecontainer); 
     layout1.setVisibility(View.GONE); 
     FrameLayout layout2 = (FrameLayout) findViewById(R.id.framecontainerTab); 
     layout2.setVisibility(View.GONE); 
     layout2.removeAllViews(); 

     mItemsFragment = new UsersListFragment(); 
     mItemsFragment.initlizeval(this); 
     setFragment(mItemsFragment); 

     //code for small screen (like smartphone) 
    } 


} 

public void setFragment(Fragment frag) 
{ 
    android.support.v4.app.FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 
    ft.add(R.id.framecontainerMain, frag).commit(); 

} 
@Override 
public void onFragmentInteraction(String uri) { 
    FrameLayout layout1 = (FrameLayout) findViewById(R.id.framecontainer); 
    layout1.setVisibility(View.GONE); 
    FrameLayout layout2 = (FrameLayout) findViewById(R.id.framecontainerTab); 
    layout2.setVisibility(View.GONE); 
} 

@Override 
public void onBackPressed() { 
    super.onBackPressed(); 

    DisplayMetrics displaymetrics = new DisplayMetrics(); 
    getWindowManager().getDefaultDisplay().getMetrics(displaymetrics); 
    int height = displaymetrics.heightPixels; 
    int width = displaymetrics.widthPixels; 
    if (width > 1023 || height > 1184) { 
     Fragment fragmentOne = new ChatFragment(); 
     FrameLayout layout1 = (FrameLayout) findViewById(R.id.framecontainer); 
     layout1.setVisibility(View.VISIBLE); 
     FrameLayout layout2 = (FrameLayout) findViewById(R.id.framecontainerTab); 
     layout2.setVisibility(View.VISIBLE); 

    } 

} 

UsersListFragment.java

public void onButtonPressed(Uri uri) { 
    if (mListener != null) { 
     String val = "'"; 
     mListener.onFragmentInteraction(val); 

    } 
} 

public void initlizeval(Context context) { 

    mListener = (OnFragmentInteractionListener) context; 
} 
@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; 
} 

public interface OnFragmentInteractionListener { 
    // TODO: Update argument type and name 
    void onFragmentInteraction(String val); 
} 

ChatFragment.java錠剤の場合

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    chatMessages = new ArrayList<>(); 
    view = inflater.inflate(R.layout.fragment_chat, container, false); 
    listView = (ListView) view.findViewById(R.id.list_msg); 

    adapter = new MessageAdapter(getActivity(), R.layout.item_chat_left, chatMessages); 

    listView.setAdapter(adapter); 
    setHasOptionsMenu(true); 

    actionBar = ((AppCompatActivity) getActivity()).getSupportActionBar(); 
    if (actionBar != null) { 
     actionBar.setDisplayUseLogoEnabled(false); 
     ColorDrawable colorDrawable = new ColorDrawable(Color.parseColor("#72B94F")); 
     actionBar.setBackgroundDrawable(colorDrawable); 
     actionBar.setHomeAsUpIndicator(R.drawable.ic_backarrow); 
     actionBar.setDisplayHomeAsUpEnabled(true); 
     actionBar.setDisplayShowTitleEnabled(true); 
     actionBar.setHomeButtonEnabled(true); 
    } 

    String[] strings = {Global.getInstance().someData, Global.getInstance().ownerId}; 
    Arrays.sort(strings); 
    Arrays.sort(strings); 
    String first = strings[0]; 
    String second = strings[1]; 
    chatKey = first + "_" + second; 

    final FirebaseUtil utils = new FirebaseUtil(getContext()); 

    String timeaTab = Global.getInstance().time; 
    chatMessages.clear(); 
    utils.startListeningMsgs(chatKey, timeaTab, new CallBack() { 
     @Override 
     public void onCallback(Map<String, Object> response, String Success) { 
      Map<String, Object> sentByMe = (Map<String, Object>) response.get("value"); 


      Double chat_time = (Double) response.get("last_sent"); 
      // String timeString = String.valueOf(chat_time); 

      String sentBy = (String) sentByMe.get("sent_by"); 
      String ownerId = Global.getInstance().ownerId; 
      synchronized (this) { 
       ChatMessage chat; 
       if (sentBy.equals(ownerId)) { 

        String msg = (String) sentByMe.get("msg"); 
        chat = new ChatMessage(); 
        chat.setContent(msg); 
        String mine = "false"; 
        chat.setIsMine(mine); 
        chat.setTime(chat_time); 

       } else { 
        String msg = (String) sentByMe.get("msg"); 
        chat = new ChatMessage(); 
        chat.setContent(msg); 
        String mine = "true"; 
        chat.setIsMine(mine); 
        chat.setTime(chat_time); 

       } 
       chatMessages.add(chat); 
      } 
      adapter.notifyDataSetChanged(); 
     } 
    }); 

    mEmailSignInButton = (Button) view.findViewById(R.id.btn_chat_send); 

    editText = (EditText) view.findViewById(R.id.msg_type); 

    //event for button SEND 
    mEmailSignInButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 


      Toast.makeText(getActivity(), String.valueOf(Global.getInstance().unreadMessageUsers.size()) , Toast.LENGTH_SHORT).show(); 
      if (editText.getText().toString().trim().equals("")) { 
       Toast.makeText(getActivity(), "Type some message...", Toast.LENGTH_SHORT).show(); 
      } else { 
       Map<String, Object> val = new HashMap<String, Object>(); 
       val.put("msg", editText.getText().toString()); 
       val.put("sent_by", Global.getInstance().ownerId); 
       val.put("sent_to", Global.getInstance().someData); 
       val.put("type", "chat"); 
       FirebaseUtil utilMsg = new FirebaseUtil(getContext()); 
       utilMsg.setNewMessageNotification(Global.getInstance().ownerId, Global.getInstance().someData, "chat"); 
       utilMsg.sendMessageRequestChatKeyValue(chatKey, val); 
       editText.setText(""); 
      } 
     } 
    }); 
    return view; 
} 
} 

、アプリケーションがクラッシュログイン後。私は私が推測するビューを設定することができません。

ログイン

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rider.project/com.rider.project.Activity.HomeActivity}: java.lang.NullPointerException: rhs == null 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
        at android.app.ActivityThread.-wrap11(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:148) 
        at android.app.ActivityThread.main(ActivityThread.java:5417) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
       Caused by: java.lang.NullPointerException: rhs == null 
        at java.lang.String.compareTo(Native Method) 
        at java.lang.String.compareTo(String.java:335) 
        at java.util.ComparableTimSort.countRunAndMakeAscending(ComparableTimSort.java:286) 
        at java.util.ComparableTimSort.sort(ComparableTimSort.java:153) 
        at java.util.ComparableTimSort.sort(ComparableTimSort.java:142) 
        at java.util.Arrays.sort(Arrays.java:1957) 
        at com.rider.project.Fragments.ChatFragment.onCreateView(ChatFragment.java:189) 
        at android.support.v4.app.Fragment.performCreateView(Fragment.java:2080) 
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1108) 
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1290) 
        at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:801) 
        at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1677) 
        at android.support.v4.app.FragmentController.execPendingActions(FragmentController.java:388) 
        at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:604) 
        at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:178) 
        at com.rider.project.Activity.HomeActivity.onStart(HomeActivity.java:172) 
        at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1237) 
        at android.app.Activity.performStart(Activity.java:6253) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)  
        at android.app.ActivityThread.-wrap11(ActivityThread.java)  
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)  
        at android.os.Handler.dispatchMessage(Handler.java:102)  
        at android.os.Looper.loop(Looper.java:148)  
        at android.app.ActivityThread.main(ActivityThread.java:5417)  
        at java.lang.reflect.Method.invoke(Native Method)  
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)  
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)  

誰かが私が何を行うことができ、私に言うことができるしてください。アンドロイドに新しい。 ありがとうございます。

Answer 1

uは

Answer 2

これを試してみてくださいマニフェストファイルにHomeActivityを追加しました：

1. 2つの異なるレイアウトフォルダ：スマートフォンのためのあなたのactvity_home.xmlを含むレイアウト、あなたのフラグメントをレイアウトなど。 layout-largeは、タブレット用のactvity_home.xmlを含んでいます。

2. In HomeActivity。Javaは、以下にご投稿コードを置き換える：

   // Part of onCreate() 
       setContentView(R.layout.activity_home); 
       FrameLayout layout1 = (FrameLayout) findViewById(R.id.framecontainer); 
       FrameLayout layout2 = (FrameLayout) findViewById(R.id.framecontainerTab); 
   
       android.support.v4.app.FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 
       // Initialize UserListFragment 
       // and setTag, UserList. [Both smartphone and tablet] 
       mItemsFragment = new UsersListFragment(); 
       mItemsFragment.initlizeval(this); 
       ft.add(R.id.framecontainer, frag, "UserList").commit(); 
   
       if (layout2 != null){ 
        // Tablet, initiallly no user selected and layout is GONE. 
        layout2.setVisibility(View.GONE); 
       } 
   } 
   
   @Override 
   public void onFragmentInteraction(String uri) { 
       FrameLayout layout2 = (FrameLayout) findViewById(R.id.framecontainerTab); 
       android.support.v4.app.FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 
       ChatFragment fragmentOne = new ChatFragment(); 
       if(layout2 == null){ // Smartphone, replace fragment. 
        ft.replace(R.id.framecontainer, fragmentOne, "Chat"); 
        ft.addToBackStack(null); 
        ft.commit(); 
       }else{ // Tablet, add fragment and show on UI. 
        ft.add(R.id.framecontainerTab, fragmentOne, "Chat").commit(); 
        layout2.setVisibility(View.VISIBLE); 
       } 
   } 
   
   @Override 
   public void onBackPressed() { 
       super.onBackPressed(); 
       FrameLayout layout2 = (FrameLayout) findViewById(R.id.framecontainerTab); 
       if (layout2 != null) { // Tablet 
        if(layout2.isShown()){ 
         android.support.v4.app.FragmentManager fm = getSupportFragmentManager(); 
         ChatFragment fragmentOne = (ChatFragment) fm.findFragmentByTag("Chat"); 
         fm.beginTransaction().remove(fragmentOne).commit(); 
         layout2.setVisibility(View.GONE); 
        } 
       } 
   } 
   

はそれが助けを願って！