RecycleView AndroidのSetOnClickListner内に常にリスナーを取得する

Question

私はプログラムをデバッグしている間、viewHolder.likeView.setOnClickListener（）およびviewHolder.mView.setOnClickListener（）内のOnClickメソッドで常にリスナーをNullとして取得しています。コードの何が問題ですか？

public class RVAdapter extends RecyclerView.Adapter<RVAdapter.ViewHolder> { 

List<Bitmap> imageUrl; 
private final RecyclerViewClickListener listener; 

public RVAdapter(List<Bitmap> imageUrl, RecyclerViewClickListener listener) { 
    this.imageUrl = imageUrl; 
    this.listener= listener; 
} 

public static class ViewHolder extends RecyclerView.ViewHolder { 
    public final CardView cv; 
    public final ImageView imageDp; 
    public final ImageView likeView; 
    public final View mView; 

    public ViewHolder(View v) { 
     super(v); 
     mView=v; 
     cv = (CardView)itemView.findViewById(R.id.card_view); 
     imageDp = (ImageView)itemView.findViewById(R.id.picView); 
     likeView = (ImageView)itemView.findViewById(R.id.likeView); 

    } 
} 

@Override 
public void onAttachedToRecyclerView(RecyclerView recyclerView) { 
    super.onAttachedToRecyclerView(recyclerView); 
} 

@Override 
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) { 
    View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.photo_display, viewGroup, false); 
    ViewHolder pvh = new ViewHolder(v); 
    return pvh; 
} 

@Override 
public void onBindViewHolder(final ViewHolder viewHolder,final int i) { 
    viewHolder.imageDp.setImageBitmap(imageUrl.get(i)); 

    viewHolder.mView.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      if (null !=listener) 
       listener.onRowClicked(i); 
     } 
    }); 

    viewHolder.likeView.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      if (null != listener) 
       listener.onViewClicked(v,i); 
     } 
    }); 

} 

@Override 
public int getItemCount() { 
    return imageUrl.size(); 
} 
} 

EDIT

public class DisplayPicActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener,RecyclerViewClickListener{ 

ImageView i; 
Bitmap mIcon_val; 
private RecyclerView rv; 
List<Bitmap> imageBit = new ArrayList<>(); 
ArrayList<String> picList; 
RecyclerViewClickListener mListener; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_display_pic); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 


    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
      this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); 
    drawer.setDrawerListener(toggle); 
    toggle.syncState(); 

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); 
    navigationView.setNavigationItemSelectedListener(this); 

    picList = getIntent().getStringArrayListExtra("test"); 

    rv=(RecyclerView)findViewById(R.id.rv); 
    LinearLayoutManager llm = new LinearLayoutManager(this); 
    rv.setLayoutManager(llm); 
    rv.setHasFixedSize(true); 
    initializeAdapter(); 

    retriveImage(picList); 

} 

private void retriveImage(ArrayList<String> picList) { 
    for (int i=0;i<picList.size();i++){ 
     urlImage(picList.get(i)); 
    } 
    final Handler myHandler = new Handler(); 
    myHandler.postDelayed(new Runnable() { 
     @Override 
     public void run() { 
      initializeAdapter(); 
     } 
    }, 3000); 
} 

private void initializeAdapter(){ 
    RVAdapter adapter = new RVAdapter(imageBit,mListener); 
    rv.setAdapter(adapter); 
} 

public void urlImage(final String url) { 

    Thread thread = new Thread() { 
     @Override 
     public void run() { 
      try { 
       URL newurl = new URL(url); 
       mIcon_val = BitmapFactory.decodeStream(newurl.openConnection().getInputStream()); 
       imageBit.add(mIcon_val); 

      } catch (MalformedURLException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } 
    }; 

    thread.start(); 
} 


@Override 
public void onViewClicked(View v, int position) { 
    if(v.getId() == R.id.likeView){ 

    } 
} 

@Override 
public void onRowClicked(int position) { 
} 

@Override 
public void onBackPressed() { 
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    if (drawer.isDrawerOpen(GravityCompat.START)) { 
     drawer.closeDrawer(GravityCompat.START); 
    } else { 
     super.onBackPressed(); 
    } 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.display_pic, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_settings) { 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 

@SuppressWarnings("StatementWithEmptyBody") 
@Override 
public boolean onNavigationItemSelected(MenuItem item) { 
    // Handle navigation view item clicks here. 
    int id = item.getItemId(); 

    if (id == R.id.nav_camera) { 
     // Handle the camera action 
    } else if (id == R.id.nav_gallery) { 

    } else if (id == R.id.nav_slideshow) { 

    } else if (id == R.id.nav_manage) { 

    } else if (id == R.id.nav_share) { 

    } else if (id == R.id.nav_send) { 

    } 

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    drawer.closeDrawer(GravityCompat.START); 
    return true; 
} 
} 

Answer 1

Probrably、あなたはあなたのif機能で誤った順序を持っています。

if (listener != null) 

の代わり：：このお試しください問題がどこにあるか

[OK]を

if (null !=listener) 

EDITを、今私は、参照してください。あなたはちょうどRecyclerViewClickListenerを初期化しません。ちょうどそれをinitialiseAdapterの機能で起動してください。