我正在尝试创建一个不仅可以记录笔记的应用程序，而且可以：
换句话说，我正在尝试将2个简单的独立Android项目集成在一起：
SearchView项目演示了搜索项目内文本的功能。
NoteTracker项目演示了添加，编辑和删除注释的功能。
我在实施解决方案时遇到了麻烦，因为我是Android开发的新手。我尝试从
添加功能但是我的新旧适配器之间存在某种冲突。
SearchView的“ MainActivity” ：
public class MainActivity extends AppCompatActivity {
private NoteAdapter adapter;
private List<Note> noteList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fillNoteList();
setUpRecyclerView();
}
private void fillNoteList() {
noteList = new ArrayList<>();
noteList.add(new Note("One", "Ten"));
noteList.add(new Note("Two", "Eleven"));
noteList.add(new Note("Three", "Twelve"));
noteList.add(new Note( "Four", "Thirteen"));
noteList.add(new Note( "Five", "Fourteen"));
noteList.add(new Note( "Six", "Fifteen"));
noteList.add(new Note( "Seven", "Sixteen"));
noteList.add(new Note( "Eight", "Seventeen"));
noteList.add(new Note( "Nine", "Eighteen"));
}
private void setUpRecyclerView() {
RecyclerView recyclerView = findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
adapter = new NoteAdapter(noteList);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.note_menu, menu);
MenuItem searchItem = menu.findItem(R.id.action_search);
SearchView searchView = (SearchView) searchItem.getActionView();
searchView.setImeOptions(EditorInfo.IME_ACTION_DONE);
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
adapter.getFilter().filter(newText);
return false;
}
});
return true;
}
}
SearchView的“ NoteAdapter” ：
public class NoteAdapter extends RecyclerView.Adapter<NoteAdapter.NoteViewHolder> implements Filterable {
private List<Note> noteList;
private List<Note> noteListFull;
class NoteViewHolder extends RecyclerView.ViewHolder {
// ImageView imageView;
TextView tvTitle;
TextView tvDescription;
NoteViewHolder(View itemView) {
super(itemView);
// imageView = itemView.findViewById(R.id.image_view);
tvTitle = itemView.findViewById(R.id.tv_title);
tvDescription = itemView.findViewById(R.id.tv_description);
}
}
NoteAdapter(List<Note> noteList) {
this.noteList = noteList;
noteListFull = new ArrayList<>(noteList);
}
@NonNull
@Override
public NoteViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.note_item,
parent, false);
return new NoteViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull NoteViewHolder holder, int position)
{
Note currentItem = noteList.get(position);
// holder.imageView.setImageResource(currentItem.getImageResource());
holder.tvTitle.setText(currentItem.getTitle());
holder.tvDescription.setText(currentItem.getDescription());
}
@Override
public int getItemCount() {
return noteList.size();
}
@Override
public Filter getFilter() {
return noteFilter;
}
private Filter noteFilter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
List<Note> filteredList = new ArrayList<>();
if (constraint == null || constraint.length() == 0) {
filteredList.addAll(noteListFull);
} else {
String filterPattern = constraint.toString().toLowerCase().trim();
for (Note item : noteListFull) {
if (item.getTitle().toLowerCase().contains(filterPattern)
||
item.getDescription().toLowerCase().contains(filterPattern)) {
filteredList.add(item);
}
}
}
FilterResults results = new FilterResults();
results.values = filteredList;
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
noteList.clear();
noteList.addAll((List) results.values);
notifyDataSetChanged();
}
};
}
NoteTaker的“ MainActivity” ：
public class MainActivity extends AppCompatActivity {
public static final int ADD_NOTE_REQUEST = 1;
public static final int EDIT_NOTE_REQUEST = 2;
private NoteViewModel noteViewModel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FloatingActionButton buttonAddNote = findViewById(R.id.button_add_note);
buttonAddNote.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, AddEditNoteActivity.class);
startActivityForResult(intent, ADD_NOTE_REQUEST);
}
});
RecyclerView recyclerView = findViewById(R.id.recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setHasFixedSize(true);
final NoteAdapter adapter = new NoteAdapter();
recyclerView.setAdapter(adapter);
noteViewModel = ViewModelProviders.of(this).get(NoteViewModel.class);
noteViewModel.getAllNotes().observe(this, new Observer<List<Note>>() {
@Override
public void onChanged(@Nullable List<Note> notes) {
adapter.setNotes(notes);
}
});
new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0,
ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
return false;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
noteViewModel.delete(adapter.getNoteAt(viewHolder.getAdapterPosition()));
Toast.makeText(MainActivity.this, "Note deleted", Toast.LENGTH_SHORT).show();
}
}).attachToRecyclerView(recyclerView);
adapter.setOnItemClickListener(new NoteAdapter.OnItemClickListener() {
@Override
public void onItemClick(Note note) {
Intent intent = new Intent(MainActivity.this, AddEditNoteActivity.class);
intent.putExtra(AddEditNoteActivity.EXTRA_ID, note.getId());
intent.putExtra(AddEditNoteActivity.EXTRA_TITLE, note.getTitle());
intent.putExtra(AddEditNoteActivity.EXTRA_DESCRIPTION, note.getDescription());
// intent.putExtra(AddEditNoteActivity.EXTRA_PRIORITY, note.getPriority());
startActivityForResult(intent, EDIT_NOTE_REQUEST);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == ADD_NOTE_REQUEST && resultCode == RESULT_OK) {
String title = data.getStringExtra(AddEditNoteActivity.EXTRA_TITLE);
String description = data.getStringExtra(AddEditNoteActivity.EXTRA_DESCRIPTION);
// int priority = data.getIntExtra(AddEditNoteActivity.EXTRA_PRIORITY, 1);
Note note = new Note(title, description);
noteViewModel.insert(note);
Toast.makeText(this, "Note saved", Toast.LENGTH_SHORT).show();
} else if (requestCode == EDIT_NOTE_REQUEST && resultCode == RESULT_OK) {
int id = data.getIntExtra(AddEditNoteActivity.EXTRA_ID, -1);
if (id == -1) {
Toast.makeText(this, "Note can't be updated", Toast.LENGTH_SHORT).show();
return;
}
String title = data.getStringExtra(AddEditNoteActivity.EXTRA_TITLE);
String description = data.getStringExtra(AddEditNoteActivity.EXTRA_DESCRIPTION);
// int priority = data.getIntExtra(AddEditNoteActivity.EXTRA_PRIORITY, 1);
Note note = new Note(title, description);
note.setId(id);
noteViewModel.update(note);
Toast.makeText(this, "Note updated", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "Note not saved", Toast.LENGTH_SHORT).show();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.main_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.delete_all_notes:
noteViewModel.deleteAllNotes();
Toast.makeText(this, "All notes deleted", Toast.LENGTH_SHORT).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
NoteTaker的“ NoteAdapter” ：
public class NoteAdapter extends RecyclerView.Adapter<NoteAdapter.NoteHolder>
{
private List<Note> notes = new ArrayList<>();
private OnItemClickListener listener;
@NonNull
@Override
public NoteHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.note_item, parent, false);
return new NoteHolder(itemView);
}
@Override
public void onBindViewHolder(@NonNull NoteHolder holder, int position) {
Note currentNote = notes.get(position);
holder.textViewTitle.setText(currentNote.getTitle());
holder.textViewDescription.setText(currentNote.getDescription());
// holder.textViewEndDate.setText(currentTerm.getTermDateEnd());
}
@Override
public int getItemCount() {
return notes.size();
}
public void setNotes(List<Note> notes) {
this.notes = notes;
notifyDataSetChanged();
}
public Note getNoteAt(int position) {
return notes.get(position);
}
class NoteHolder extends RecyclerView.ViewHolder {
private TextView textViewTitle;
private TextView textViewDescription;
// private TextView textViewEndDate;
public NoteHolder(@NonNull View itemView) {
super(itemView);
textViewTitle = itemView.findViewById(R.id.text_view_title);
textViewDescription = itemView.findViewById(R.id.text_view_description);
// textViewEndDate = itemView.findViewById(R.id.text_view_date_end);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = getAdapterPosition();
if (listener != null && position != RecyclerView.NO_POSITION) {
listener.onItemClick(notes.get(position));
}
}
});
}
}
public interface OnItemClickListener {
void onItemClick(Note note);
}
public void setOnItemClickListener(OnItemClickListener listener) {
this.listener = listener;
}
}
您能帮我解决这个问题吗？预先感谢！