Ich versuche, Recyclerview mit Daten aus SQLite-Datenbank Inhalt laden. Aber es funktioniert nichtRecyclerView wird nicht mit Daten gefüllt
Dies ist, was ich
Aktivitätsklasse
public class ViewMembership extends AppCompatActivity {
private RecyclerView recyclerView;
private membership_view_recycler_adapter m;
private DBHelper dbHelper;
public List<membership_recycler_model> membershipList=new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_membership);
dbHelper=new DBHelper(this);
////////////////////////////////////////////////////////////////////////////
recyclerView=(RecyclerView) findViewById(R.id.View_Membership_Recycler);
m=new membership_view_recycler_adapter(membershipList);
RecyclerView.LayoutManager layoutManager=new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(layoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));
recyclerView.setAdapter(m);
prepare_membership();
//////////////////////////////////////////////////////////////////////////
}
public void prepare_membership()
{
System.out.println("#######################Prepare_membership called");
membershipList=dbHelper.membership_for_recycler_view();
m.notifyDataSetChanged();
}}
Adapter Klasse
public class membership_view_recycler_adapter extends RecyclerView.Adapter<membership_view_recycler_adapter.MyViewHolder> {
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView name,region;
public MyViewHolder(View itemView) {
super(itemView);
name=(TextView) itemView.findViewById(R.id.membership_name_textview);
region=(TextView) itemView.findViewById(R.id.membership_region_textview);
}
}
public membership_view_recycler_adapter(List<membership_recycler_model> membership_list) {
this.membership_list = membership_list;
}
private List<membership_recycler_model> membership_list;
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.membership_view_row,parent,false);
return new MyViewHolder(view);
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
membership_recycler_model membership=membership_list.get(position);
holder.name.setText(membership.getMembership_name());
holder.region.setText(membership.getRegion());
}
@Override
public int getItemCount() {
return membership_list.size();
}}
ich habe keine Kompilierungsfehlern getan haben, die Anwendung nicht werfen wird Ausnahmen. dbHelper.membership_for_recycler_view() gibt entsprechende Werte zurück. Ich bin ein bisschen neu in Android. Ich habe das mit Hilfe eines Tutorials gemacht. Was habe ich falsch gemacht?
wird das ausprobieren. –
Habe es funktioniert .. Vielen Dank –