Recyclerview e addOnScrollListener atayınca uygulama çöküyor
Hata Kaynağı
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.davulgablog/com.example.davulgablog.view.Makaleler}: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.recyclerview.widget.RecyclerView.addOnScrollListener(androidx.recyclerview.widget.RecyclerView$OnScrollListener)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3764)Makaleler sınıfım
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.example.davulgablog.R;
import com.example.davulgablog.adapter.AnasayfaAdapter;
import com.example.davulgablog.adapter.MakalelerAdapter;
import com.example.davulgablog.api.ContentsApi;
import com.example.davulgablog.databinding.MakalelerBinding;
import com.example.davulgablog.model.AnasayfaButton;
import com.example.davulgablog.service.Contents;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import java.util.ArrayList;
import java.util.List;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.disposables.CompositeDisposable;
import io.reactivex.schedulers.Schedulers;
import retrofit2.Retrofit;
import retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;
public class Makaleler extends AppCompatActivity {
ArrayList<ContentsApi> contents;
AnasayfaAdapter buttonAdapter;
private String BASE_URL = "https://aa.com.tr/";
Retrofit retrofit;
RecyclerView recyclerView;
MakalelerBinding contentContext;
MakalelerAdapter contentsAdp;
CompositeDisposable compositeDisposable;
protected void onCreate(@Nullable Bundle savedInstanceState) {
contentContext=MakalelerBinding.inflate(getLayoutInflater());
super.onCreate(savedInstanceState);
ArrayList<AnasayfaButton> btnlist=new ArrayList<>();
btnlist.add(new AnasayfaButton("Makaleler","btncontent",R.drawable.news));
btnlist.add(new AnasayfaButton("Köyümüz","btnLand",R.drawable.explore));
btnlist.add(new AnasayfaButton("Etkinlikler","btnEvent",R.drawable.event));
btnlist.add(new AnasayfaButton("Foto Galeri","btngallery",R.drawable.photo));
btnlist.add(new AnasayfaButton("Video Galeri","btnVid",R.drawable.video_play));
btnlist.add(new AnasayfaButton("Derneğimiz","btnDernek",R.drawable.nature));
btnlist.add(new AnasayfaButton("Sayfalar","btnLayer",R.drawable.layer));
btnlist.add(new AnasayfaButton("İletişim","btnContact",R.drawable.messsage));
btnlist.add(new AnasayfaButton("Hakkında","btnAbout",R.drawable.android));
buttonAdapter=new AnasayfaAdapter(btnlist);
contentContext.sliderRecycler.setLayoutManager(new GridLayoutManager(Makaleler.this,1, LinearLayoutManager.HORIZONTAL, false));
contentContext.sliderRecycler.setAdapter(buttonAdapter);
recyclerView = findViewById(R.id.content_Recycler);
Gson gson = new GsonBuilder().setLenient().create();
retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create(gson))
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.build();
loadData();
setContentView(contentContext.getRoot());
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
public void onScrolled(RecyclerView recyclerView,int dx , int dy) {
super.onScrolled(recyclerView, dx, dy);
Log.i("cc","Scrolled");
}
});
}
}Hatam nerde sizce?
