Wie Pass Parameter zwischen zwei Fragmenten onClick Button

Question

Ich habe das folgende Problem: Wenn ich auf die Schaltfläche klicken, ich möchte übergeben Parameter von MyListFragment zu FragmentTwo; aber der Code, den ich habe funktioniert nicht ... ich weiß nicht warum ... Ich hoffe, dass Sie mir helfen können! Dank

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 FRAGMENT LISTE:

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 ZWEI:

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) 

Answer 1

Versuchen Sie das !!!

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(); 

} 

wenn Fragment ersetzen FrameLayout ändern two_fragment.xml

<?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> 

Answer 2

Ich denke, Ihr Problem hier auf Linie darauf hin, durch Pfeil unten

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);