SetOnItemClickListener funktioniert nicht in Fragment

Question

Ich verwende RecycleView, um Liste von Name und Beschreibung anzuzeigen. Ich verwende , um das gewünschte Layout anzuzeigen. Jetzt möchte ich die neue Aktivität onItemClick öffnen. Ich habe SetOnItemClickListener innerhalb der Fragment deklariert, d.h. in "View onCreateView". Aber es funktioniert nicht. Hier ist mein Code:

Das ist meine Java-Klasse:

public class TabsHeaderActivity extends AppCompatActivity { 
private static final String TAG = TabsHeaderActivity.class.getSimpleName(); 

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

    final Toolbar toolbar = (Toolbar) findViewById(R.id.htab_toolbar); 
    setSupportActionBar(toolbar); 
    if (getSupportActionBar() != null) getSupportActionBar().setTitle("TECHNOLOGY"); 
    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 

    final ViewPager viewPager = (ViewPager) findViewById(R.id.htab_viewpager); 
    setupViewPager(viewPager); 

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

    final CollapsingToolbarLayout collapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.htab_collapse_toolbar); 

    try { 
     Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.header); 
     Palette.from(bitmap).generate(new Palette.PaletteAsyncListener() { 
      @SuppressWarnings("ResourceType") 
      @Override 
      public void onGenerated(Palette palette) { 

       int vibrantColor = palette.getVibrantColor(R.color.primary_500); 
       int vibrantDarkColor = palette.getDarkVibrantColor(R.color.primary_700); 
       collapsingToolbarLayout.setContentScrimColor(vibrantColor); 
       collapsingToolbarLayout.setStatusBarScrimColor(vibrantDarkColor); 
      } 
     }); 

    } catch (Exception e) { 
     // if Bitmap fetch fails, fallback to primary colors 
     Log.e(TAG, "onCreate: failed to create bitmap from background", e.fillInStackTrace()); 
     collapsingToolbarLayout.setContentScrimColor(
       ContextCompat.getColor(this, R.color.primary_500) 
     ); 
     collapsingToolbarLayout.setStatusBarScrimColor(
       ContextCompat.getColor(this, R.color.primary_700) 
     ); 
    } 

    tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() { 
     @Override 
     public void onTabSelected(TabLayout.Tab tab) { 

      viewPager.setCurrentItem(tab.getPosition()); 
      Log.d(TAG, "onTabSelected: pos: " + tab.getPosition()); 

      switch (tab.getPosition()) { 
       case 0: 
        break; 
      } 
     } 

     @Override 
     public void onTabUnselected(TabLayout.Tab tab) { 

     } 

     @Override 
     public void onTabReselected(TabLayout.Tab tab) { 

     } 
    }); 
} 

private void setupViewPager(ViewPager viewPager) { 
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager()); 
    adapter.addFrag(new DummyFragment(
      ContextCompat.getColor(this, R.color.cyan_50)), "Cyan"); 
    adapter.addFrag(new DummyFragment(
      ContextCompat.getColor(this, R.color.amber_50)), "Amber"); 
    adapter.addFrag(new DummyFragment(
      ContextCompat.getColor(this, R.color.purple_50)), "Purple"); 
    adapter.addFrag(new DummyFragment(
      ContextCompat.getColor(this, R.color.grey)), "Grey"); 
    viewPager.setAdapter(adapter); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    getMenuInflater().inflate(R.menu.menu_main, menu); 

    final MenuItem searchItem = menu.findItem(R.id.menuSearch); 
    final SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem); 

    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener(){ 

     @Override 
     public boolean onQueryTextSubmit(String query) { 
      return false; 
     } 

     @Override 
     public boolean onQueryTextChange(String newText) { 
      return true; 
     } 
    }); 

    return super.onCreateOptionsMenu(menu); 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    switch (item.getItemId()) { 
     case android.R.id.home: 
      finish(); 
      return true; 
    } 
    return super.onOptionsItemSelected(item); 
} 

private static 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); 
    } 
} 

public static class DummyFragment extends Fragment { 
    int color; 
    Intent intent; 

    public DummyFragment() { 
    } 

    @SuppressLint("ValidFragment") 
    public DummyFragment(int color) { 
     this.color = color; 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     View view = inflater.inflate(R.layout.dummy_fragment, container, false); 

     final FrameLayout frameLayout = (FrameLayout) view.findViewById(R.id.dummyfrag_bg); 
     frameLayout.setBackgroundColor(color); 

     RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.dummyfrag_scrollableview); 

     LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity().getBaseContext()); 
     recyclerView.setLayoutManager(linearLayoutManager); 
     recyclerView.setHasFixedSize(true); 

     DessertAdapter adapter = new DessertAdapter(getContext()); 
     recyclerView.setAdapter(adapter); 

     adapter.SetOnItemClickListener(new DessertAdapter.OnItemClickListener(){ 

      @Override 
      public void onItemClick(View view, int position) { 
       switch (position) { 
        case 3: 
         intent = new Intent(view.getContext(), LaunchScreenActivity.class); 
         startActivity(intent); 
       } 
      } 
     }); 

     return view; 
    } 
} 
} 

Das ist mein Adapter Klasse:

public class DessertAdapter extends RecyclerView.Adapter<DessertAdapter.DessertVh> { 

private List<Dessert> desserts = new ArrayList<>(); 
OnItemClickListener clickListener; 
private Context context; 

public DessertAdapter(Context context) { 
    this.context = context; 

    desserts = Dessert.prepareDesserts(
      context.getResources().getStringArray(R.array.dessert_names), 
      context.getResources().getStringArray(R.array.dessert_descriptions)); 
} 

@Override 
public DessertVh onCreateViewHolder(ViewGroup parent, int viewType) { 
    LayoutInflater inflater = LayoutInflater.from(parent.getContext()); 
    View view = inflater.inflate(R.layout.item_dessert, parent, false); 
    return new DessertAdapter.DessertVh(view); 
} 

@Override 
public void onBindViewHolder(DessertVh holder, int position) { 
    Dessert dessert = desserts.get(position); 

    holder.mName.setText(dessert.getName()); 
    holder.mDescription.setText(dessert.getDescription()); 
    holder.mFirstLetter.setText(String.valueOf(dessert.getFirstLetter())); 

} 

@Override 
public int getItemCount() { 
    return desserts == null ? 0 : desserts.size(); 
} 

public class DessertVh extends RecyclerView.ViewHolder implements View.OnClickListener{ 

    private TextView mName; 
    private TextView mDescription; 
    private TextView mFirstLetter; 

    public DessertVh(View itemView) { 
     super(itemView); 

     mName = (TextView) itemView.findViewById(R.id.txt_name); 
     mDescription = (TextView) itemView.findViewById(R.id.txt_desc); 
     mFirstLetter = (TextView) itemView.findViewById(R.id.txt_firstletter); 
    } 

    @Override 
    public void onClick(View v) { 
     clickListener.onItemClick(v, getPosition()); 
    } 
} 

public interface OnItemClickListener { 
    public void onItemClick(View view, int position); 
} 

public void SetOnItemClickListener(final OnItemClickListener itemClickListener) { 
    this.clickListener = itemClickListener; 
} 

Ich bin nicht sicher, was ich falsch mache. Ich habe es im Debugger-Modus überprüft. Ich habe einen Haltepunkt in Zeile setzen:

adapter.SetOnItemClickListener(new DessertAdapter.OnItemClickListener(){ 

Nun, wenn meine Activity wird geladen Debugger auf dieser Linie kommt aber, geht nicht in seinem Innern. Aber wenn ich etwas anklicke, kommt der Debugger nicht einmal in diese Zeile, dh wenn ich auf ein Element klicke, wird SetOnItemClickListener nicht ausgelöst.

Mein xml-Code ist:

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

<android.support.v7.widget.RecyclerView 
    android:id="@+id/dummyfrag_scrollableview" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:clipToPadding="false" 
    android:paddingBottom="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_horizontal_margin" /> 
</FrameLayout> 

Answer 1

Nun, Sie

DessertVh extends RecyclerView.ViewHolder implements View.OnClickListener 

ein normaler Klick Zuhörer

implementiert Aber Sie setzen es nie.

public DessertVh(View itemView) { 
    super(itemView); 

    mName = (TextView) itemView.findViewById(R.id.txt_name); 
    mDescription = (TextView) itemView.findViewById(R.id.txt_desc); 
    mFirstLetter = (TextView) itemView.findViewById(R.id.txt_firstletter); 
} 

Haben Sie vergessen, über itemView.setOnClickListener(this)?