我想从编辑文本中获取数据并将其提供给适配器,但适配器为空数据不为空,因为我可以toast它,但它不会显示在我的模型中
我现在的问题是:当一个适配器在recyclerview中为空时,该问题的解决方案是什么?
请帮助绿色开发商;这是我的第一个应用程序。任何建议都将受到欢迎。
这是我的主要活动
public class MainActivity extends AppCompatActivity {
public static final int request_code=1001;
RecyclerView recyclerView;
NoteListAdapter noteListAdapter;
List<Notes> Notes_list=new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView=findViewById(R.id.mainAc_recyclerview_notes);
noteListAdapter = new NoteListAdapter(this,Notes_list);
LinearLayoutManager linearLayoutManager=new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setAdapter(noteListAdapter);
Button newnote= findViewById(R.id.mainAc_button_new);
newnote.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(MainActivity.this,GenerateNote.class);
startActivityForResult(intent,request_code);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode==request_code && resultCode==RESULT_OK && data!=null){
String name=data.getExtras().getString(result_name);
String description=data.getExtras().getString(result_description);
Notes notes=new Notes();
notes.setSnTitle(name);
notes.setSnDescription(description);
NoteListAdapter adapter=new NoteListAdapter(this,Notes_list);
adapter.addNote(notes);
Toast.makeText(MainActivity.this,name,Toast.LENGTH_LONG).show();
}
}
}
适配器
public class NoteListAdapter extends RecyclerView.Adapter<NoteListAdapter.notesViewHolder> {
@NonNull
private Context context;
private List<Notes> notes_list=new ArrayList<>();
public NoteListAdapter(Context context, List<Notes> notes_list) {
this.context = context;
this.notes_list=notes_list;
}
@Override
public NoteListAdapter.notesViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(context);
View view = layoutInflater.inflate(R.layout.activity_sample_note, parent, false);
return new notesViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull NoteListAdapter.notesViewHolder holder, int position) {
holder.bindNotes(notes_list.get(position));
}
@Override
public int getItemCount() {
return notes_list.size();
}
public void addNote(Notes notes){
notes_list.add(notes);
notifyItemInserted(1);
}
public class notesViewHolder extends RecyclerView.ViewHolder {
private TextView title;
private TextView description;
notesViewHolder(@NonNull View itemView) {
super(itemView);
title = (TextView)itemView.findViewById(R.id.sn_textview_title);
description = (TextView)itemView.findViewById(R.id.sn_textview_description);
}
public void bindNotes(Notes notes) {
title.setText(notes.getSnTitle());
description.setText(notes.getSnDescription());
}
}
}
为结果而努力
public class GenerateNote extends AppCompatActivity {
public static final String result_name="result_name";
public static final String result_description="result_description";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_generate_note);
final EditText name=findViewById(R.id.gn_edittext_name);
final EditText description=findViewById(R.id.gn_edittext_family);
Button save=findViewById(R.id.gn_button_save);
save.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent();
intent.putExtra(result_name,name.getText().toString());
intent.putExtra(result_description,description.getText().toString());
setResult(RESULT_OK,intent);
finish();
}
});
}
}
2条答案
按热度按时间q8l4jmvw1#
在onactivityresult();)中更改以下代码
4ioopgfo2#
适配器中有一个方法可以添加注解。因此,您可以直接使用该方法适配器。