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2日後にsqliteデータベースにデータを挿入するとすぐに私のRecyclerViewが更新できない理由がわかりません。Sqliteデータベースに新しいデータが追加されたときにrecyclerviewを更新する方法
私はnofityDataSetChangedとswapAdapter、このような多くの方法をしようとしてきたが、まだ私のRecyclerViewは、私は、データがRecyclerViewに追加された前に別のアクティビティに移動する必要があり、それを更新し、更新されません。
だから誰でも私はそれが間違っていると私に伝えることができますか？
私のフラグメントでクエリ
public void AddData(){
reg_pet.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
items=new ArrayList<>();
final int position=0;
adapter=new reg_Adapter(getActivity(),items);
boolean insterdata = myDB.insertDataToPetRegister(pet_name.getText().toString(),
spin_type.getSelectedItem().toString(), spin_breed.getSelectedItem().toString());
if (insterdata = true) {
adapter.notifyItemInserted(position);
adapter.notifyDataSetChanged();
pet_name.setText("");
Toast.makeText(getActivity(), "Your Pet has been Registered", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getActivity(), "Your Pet has not been Registerd", Toast.LENGTH_LONG).show();
}
}
});
}
マイアダプタ
public class reg_Adapter extends RecyclerView.Adapter<reg_ViewHolder> {
Activity activity;
Register_pet_database register_pet_database;
List<db_getItem> items;
db_getItem adapter;
DBAdapter dbAdapter;
public reg_Adapter(Activity activity, List<db_getItem> items) {
this.activity = activity;
this.items = items;
}
public reg_ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.reg_pet_recycler, parent, false);
return new reg_ViewHolder(view);
}
@Override
public void onBindViewHolder(reg_ViewHolder holder, final int position) {
holder.pet_name.setText(items.get(position).getPet_name());
holder.pet_type.setText(items.get(position).getPet_type());
holder.pet_breed.setText(items.get(position).getPet_breed());
holder.btndel.setTag(items.get(position).getPet_name());
holder.btndel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
register_pet_database=new Register_pet_database(v.getContext());
Integer deleted =register_pet_database.deleteData(v.getTag().toString());
if (deleted > 0) {
items.remove(position);
notifyItemRemoved(position);
Toast.makeText(v.getContext(), "Pet Has been Remove", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(v.getContext(), "Pet not Removed", Toast.LENGTH_SHORT).show();
}
}
});
}
@Override
public int getItemCount() {
return items.size();
}
}
私のコード
のための相続人は私のコードpublic class pet_tab extends Fragment {
RecyclerView recyclerView;
Register_pet_database register_pet_database;
ArrayList<db_getItem> arrayList;
reg_Adapter reg_adapter;
db_getItem item;
ImageButton btndel;
TextView pet_name;
Cursor c;
public pet_tab() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view= inflater.inflate(R.layout.fragment_pet_tab, container, false);
recyclerView=(RecyclerView)view.findViewById(R.id.reg_pet_recycler);
btndel=(ImageButton)view.findViewById(R.id.btndel);
loadDb();
return view;
}
public void loadDb(){
register_pet_database=new Register_pet_database(getActivity());
DBAdapter db=new DBAdapter(getActivity());
db.openDB();
arrayList=new ArrayList<>();
c=register_pet_database.quearyData("select * from Pet_Registered");
final int position=0;
try {
if(c!=null){
if(c.moveToFirst()){
do {
db_getItem item = new db_getItem();
item.setPet_name(c.getString(1));
item.setPet_type(c.getString(2));
item.setPet_breed(c.getString(3));
arrayList.add(item);
}while(c.moveToNext());
}
}
}catch (SQLException e){
e.printStackTrace();
}
reg_Adapter adapter=new reg_Adapter(getActivity(),arrayList);
recyclerView.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager=new LinearLayoutManager(getContext());
recyclerView.setLayoutManager(linearLayoutManager);;
recyclerView.swapAdapter(adapter,false);
}
}