どのように2つのフラグメント間のパラメータを渡すかonClick Button

私は以下の問題があります。ボタンをクリックすると、MyListFragmentからFragmentTwoにパラメータを渡します。しかし、私が持っているコードは動作しません...私はなぜ...あなたが私を助けることを願っています！おかげどのように2つのフラグメント間のパラメータを渡すかonClick Button

public class ScrollableTabsActivity extends AppCompatActivity { 

    private Toolbar toolbar; 
    private TabLayout tabLayout; 
    private ViewPager viewPager; 

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

     toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 
     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 

     viewPager = (ViewPager) findViewById(R.id.viewpager); 
     setupViewPager(viewPager); 

     tabLayout = (TabLayout) findViewById(R.id.tabs); 
     tabLayout.setupWithViewPager(viewPager); 
    } 

    private void setupViewPager(ViewPager viewPager) { 
     ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager()); 
     adapter.addFrag(new MyListFragment(),"PIZZE"); 
     adapter.addFrag(new TwoFragment(), "TWO"); 
     adapter.addFrag(new ThreeFragment(), "THREE"); 
     adapter.addFrag(new FourFragment(), "FOUR"); 
     adapter.addFrag(new FiveFragment(), "FIVE"); 
     adapter.addFrag(new SixFragment(), "SIX"); 
     adapter.addFrag(new SevenFragment(), "SEVEN"); 
     adapter.addFrag(new EightFragment(), "EIGHT"); 
     adapter.addFrag(new NineFragment(), "NINE"); 
     adapter.addFrag(new TenFragment(), "TEN"); 


     viewPager.setAdapter(adapter); 
    } 


    class ViewPagerAdapter extends FragmentPagerAdapter { 
     private final List<Fragment> mFragmentList = new ArrayList<>(); 
     private final List<String> mFragmentTitleList = new ArrayList<>(); 

     public ViewPagerAdapter(FragmentManager manager) { 
      super(manager); 
     } 

     @Override 
     public Fragment getItem(int position) { 
      return mFragmentList.get(position); 
     } 

     @Override 
     public int getCount() { 
      return mFragmentList.size(); 
     } 

     public void addFrag(Fragment fragment, String title) { 
      mFragmentList.add(fragment); 
      mFragmentTitleList.add(title); 
     } 

     @Override 
     public CharSequence getPageTitle(int position) { 
      return mFragmentTitleList.get(position); 
     } 
    } 

}

MYフラグメントリスト：

public class MyListFragment extends Fragment implements 
     android.widget.CompoundButton.OnCheckedChangeListener { 

    ListView lv; 
    ArrayList<Planet> planetList; 
    PlanetAdapter plAdapter; 


    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_list2, container, false); 
     Button mButton = (Button) rootView.findViewById(R.id.button); 
     mButton.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) { 
      showResult(v); 

      } 
     }); 
     //return inflater.inflate(R.layout.fragment_list2, container, false); 
     return rootView; 
    } 


    @Override 
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { 
     super.onViewCreated(view, savedInstanceState); 

     lv = (ListView)getView().findViewById(R.id.listview); 
     displayPlanetList(); 
    } 


    private void displayPlanetList() { 

     planetList = new ArrayList<Planet>(); 
     planetList.add(new Planet("Margherita", 6, "€")); 
     planetList.add(new Planet("Diavola", 7,"€")); 
     planetList.add(new Planet("Bufalina", 5,"€")); 
     planetList.add(new Planet("Marinara", 5,"€")); 
     planetList.add(new Planet("Viennese", 4,"€")); 

     plAdapter = new PlanetAdapter(planetList, getContext()) { 
      @Override 
      public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 
       int pos = lv.getPositionForView(buttonView); 
       if (pos != ListView.INVALID_POSITION) { 
        Planet p = planetList.get(pos); 
        p.setSelected(isChecked); 


      /*Toast.makeText(
       getActivity(), 
       "Clicked on Pizza: " + p.getName() + ". State: is " 
         + isChecked, Toast.LENGTH_SHORT).show();*/ 
       } 


      } 
     }; 
     lv.setAdapter(plAdapter); 
    } 



    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 

     /*int pos = lv.getPositionForView(buttonView); 
     if (pos != ListView.INVALID_POSITION) { 
      Planet p = planetList.get(pos); 
      p.setSelected(isChecked); 


      *//*Toast.makeText(
       getActivity(), 
       "Clicked on Planet: " + p.getName() + ". State: is " 
         + isChecked, Toast.LENGTH_SHORT).show();*//* 
     }*/ 

    } 


    public void showResult(View v) { 
     String result = "Selected Product are :"; 
     int totalAmount=0; 
     String b=""; 

     for (Planet p : plAdapter.getBox()) { 
      if (p.selected){ 

       result += "\n" + p.name+" "+p.distance+"€"+"q.tà :"+p.getQuantità(); 
       int quantitaInt= Integer.parseInt(p.getQuantità()); 
       totalAmount+=p.distance * quantitaInt; 
       b=String.valueOf(totalAmount); 


      } 
     } 
    // Toast.makeText(getActivity(), result + "\n" + "Total Amount:=" + totalAmount+"€", Toast.LENGTH_LONG).show(); 

     Fragment fragment = new Fragment(); 
     Bundle bundle = new Bundle(); 
     bundle.putString("totale", b); 
     fragment.setArguments(bundle); 







    } 

}

FRAGMENT TWO：

public class TwoFragment extends Fragment{ 

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

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     View rootView = inflater.inflate(R.layout.fragment_two, container, false); 

     TextView titolo2 = (TextView)rootView.findViewById(R.id.quantità2); 
     Bundle bundle=getArguments(); 
     String myInt = bundle.getString("totale", null); 
     titolo2.setText(myInt); 

     return rootView; 
    } 

}

LOGCAT：

05-05 10:00:59.476 14753-14753/info.androidhive.materialtabs E/AndroidRuntime: FATAL EXCEPTION: main 
                       java.lang.NullPointerException 
                        at info.androidhive.materialtabs.fragments.TwoFragment.onCreateView(TwoFragment.java:32) 
                        at android.support.v4.app.Fragment.performCreateView(Fragment.java:1974) 
                        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067) 
                        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252) 
                        at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:742) 
                        at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617) 
                        at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:570) 
                        at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141) 
                        at android.support.v4.view.ViewPager.populate(ViewPager.java:1177) 
                        at android.support.v4.view.ViewPager.populate(ViewPager.java:1025) 
                        at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1545) 
                        at android.view.View.measure(View.java:12723) 
                        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698) 
                        at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:668) 
                        at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:735) 
                        at android.view.View.measure(View.java:12723) 
                        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698) 
                        at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 
                        at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) 
                        at android.view.View.measure(View.java:12723) 
                        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698) 
                        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369) 
                        at android.widget.LinearLayout.measureVertical(LinearLayout.java:660) 
                        at android.widget.LinearLayout.onMeasure(LinearLayout.java:553) 
                        at android.view.View.measure(View.java:12723) 
                        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698) 
                        at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 
                        at android.view.View.measure(View.java:12723) 
                        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698) 
                        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369) 
                        at android.widget.LinearLayout.measureVertical(LinearLayout.java:660) 
                        at android.widget.LinearLayout.onMeasure(LinearLayout.java:553) 
                        at android.view.View.measure(View.java:12723) 
                        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698) 
                        at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 
                        at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2092) 
                        at android.view.View.measure(View.java:12723) 
                        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1064) 
                        at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442) 
                        at android.os.Handler.dispatchMessage(Handler.java:99) 
                        at android.os.Looper.loop(Looper.java:137) 
                        at android.app.ActivityThread.main(ActivityThread.java:4424) 
                        at java.lang.reflect.Method.invokeNative(Native Method) 
                        at java.lang.reflect.Method.invoke(Method.java:511) 
                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
                        at dalvik.system.NativeStart.main(Native Method)

出典

2016-05-05 Markella92

ポストあなたのlogcat –

私は、これはあなたが期待通りに動作しますが、これを試してみますかわかりません。インタフェースを使用して、フラグメント内に実装してデータを取得するか、別のものを取得する。FragmentActivityにメソッドを置き、そのメソッドに値を設定し、2番目のフラグメントのメソッドにアクセスする。 – Raghavendra

私は今投稿しました:) – Markella92

public class TwoFragment extends Fragment{ 

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

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    View rootView = inflater.inflate(R.layout.fragment_two, container, false); 

    TextView titolo2 = (TextView)rootView.findViewById(R.id.quantità2); 
    Bundle bundle=getArguments(); 
    if(bundle != null){ 
    String myInt = bundle.getString("totale", null); 
    titolo2.setText(myInt); 
    } 


    return rootView; 
} 

}

OneFragment

public void showResult(View v) { 
    String result = "Selected Product are :"; 
    int totalAmount=0; 
    String b=""; 

    for (Planet p : plAdapter.getBox()) { 
     if (p.selected){ 

      result += "\n" + p.name+" "+p.distance+"€"+"q.tà :"+p.getQuantità(); 
      int quantitaInt= Integer.parseInt(p.getQuantità()); 
      totalAmount+=p.distance * quantitaInt; 
      b=String.valueOf(totalAmount); 


     } 
    } 
// Toast.makeText(getActivity(), result + "\n" + "Total Amount:=" + totalAmount+"€", Toast.LENGTH_LONG).show(); 

    Bundle bun = new Bundle(); 
    bun.putString("totale", b); 
    TwoFragment fgsearch = new TwoFragment(); 
    fgsearch.setArguments(bun); 
    android.support.v4.app.FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction(); 
    transaction.replace(R.id.content_main, fgsearch); 
    transaction.commit(); 

}

とき断片を置換でframeLayoutがtwo_fragment.xmlに変わります

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:id="@+id/frame_layout" 
android:layout_width="match_parent" 
android:layout_height="match_parent"> 



<FrameLayout 
    android:id="@+id/content_main" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"/> 


</LinearLayout>

出典

2016-05-05 08:06:24

このコードは私にエラーを与えませんが、ボタンをクリックすると、プログラムをクリックするとタブ "2"になりません – Markella92

メソッド。置換フラグメントを追加します。それはタブ "2"に行く –

私はクリックするとどのようにフラグメントを置き換えることができますか？コードを書くことはできますか？ – Markella92

私はあなたの問題はラインにここにいると思うによって指摘下の矢印

TextView titolo2 = (TextView)rootView.findViewById(R.id.quantità2); 
    Bundle bundle=getArguments(); 
    String myInt = bundle.getString("totale", null);<---- here remove the null 
    //argument do it like this below 
    String myInt = bundle.getString("totale") 
    titolo2.setText(myInt);

出典

2016-05-05 08:02:21 Nowshad

これはデフォルト値です。問題ではありません。 bundle.getString（ "totale"）が失敗すると、私は知っているようにnullを返します。 – Raghavendra

"null"を取り除いても同じ問題が発生する – Markella92

これをチェックしてみてください。すでにこの種の問題に直面しているかもしれません:) – Nowshad

どのように2つのフラグメント間のパラメータを渡すかonClick Button

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