我正在使用recyclerview来显示房间数据库中的笔记列表。我还添加了搜索功能。目前，我在MainActivity中有4个注释（此活动显示注释）。搜索时，如果得到的结果列表包含2个以上的注释，则单击它们时会显示正确的注释;但是，如果结果包含1个或2个注释，则始终显示列表中的前2个注释，而不是通过搜索过滤的注释。 这是我的代码：
模型类注意：
@Entity(tableName = TABLE_NAME)
public class Note implements Serializable{
@Nullable
private int Color;
@PrimaryKey(autoGenerate = true)
private long id;
/** Not-null value. */
private String Desc;
private String Time;
// KEEP FIELDS - put your custom fields here
// KEEP FIELDS END
public Note() {
}
public Note(String Desc, String Time) {
this.Desc = Desc;
this.Time = Time;
}
public int getColor() {
return Color;
}
public void setColor(int color) {
Color = color;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
/** Not-null value. */
public String getDesc() {
return Desc;
}
/** Not-null value; ensure this value is available before it is saved to the database. */
public void setDesc(String Desc) {
this.Desc = Desc;
}
public String getTime() {
return Time;
}
public void setTime(String Time) {
this.Time = Time;
}
NotesAdapter：
public class NotesAdapter extends RecyclerView.Adapter<NotesAdapter.MyViewHolder> {
public List<Note> list;
private Context context;
private List<Note> filteredList = new ArrayList<>();
private ClickListener clickListener;
public List<Note> selectednotes_list = new ArrayList<>();
private String TAG = NotesAdapter.class.getSimpleName();
class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView mNoteDesc;
public TextView mNoteTime;
public RelativeLayout mcontainer;
public MyViewHolder(View itemView) {
super(itemView);
itemView.setOnClickListener(this);
mNoteTime = itemView.findViewById(R.id.note_time);
mNoteDesc = itemView.findViewById(R.id.note_desc);
mcontainer = itemView.findViewById(R.id.note_container);
}
@Override
public void onClick(View v) {
Log.d(TAG, "onClick: ");
clickListener.onClick(v,this.getLayoutPosition());
}
/*
@Override
public void onClick(View v) {
Log.d(TAG, "onClick: ");
clickListener.onClick(v,getLayoutPosition());
//clickListener.onClick(filteredList.get(getAdapterPosition()));
}
*/
}
public NotesAdapter(List<Note> list, Context context,List<Note> selectednotes_list) {
this.list = list;
this.filteredList = list;
this.context = context;
this.selectednotes_list = selectednotes_list;
this.clickListener = (ClickListener) context;
}
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.noteview,null,false);
return new MyViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
holder.mNoteTime.setText(list.get(position).getTime());
holder.mcontainer.setBackgroundColor(Utils.getRandomMaterialColor(context, "50to300"));
holder.mNoteDesc.setText(list.get(position).getDesc());
// Change background color on select
if (selectednotes_list.size() > 0) {
if (selectednotes_list.contains(list.get(position)))
holder.mcontainer.setBackgroundColor(ContextCompat.getColor(context, R.color.colorSecondary));
}
}
@Override
public int getItemCount() {
return list.size();
}
public void filterList(List<Note> filter) {
this.list = filter;
notifyDataSetChanged();
}
}
MainActivity：
public class MainActivity extends AppCompatActivity implements ClickListener{
private StaggeredGridLayoutManager gridLayoutManager;
private RecyclerView recyclerView;
private List<Note> noteList, multiSelectList;
public NotesAdapter notesAdapter;
private Notedatabase notedatabase;
private String TAG = MainActivity.class.getSimpleName();
private FloatingActionButton maddbtn;
private int position;
private SearchView mSearchView;
private boolean isMultiSelect = false;
private Menu context_menu;
private ActionMode mActionMode;
private CoordinatorLayout mCoordinatorLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();
displayList();
/*
notesList.addAll(noteList);
List<Note> notesList = getNotes();
notesAdapter = new NotesAdapter(notesList,MainActivity.this);
recyclerView.setAdapter(notesAdapter);
*/
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu,menu);
// Searchable config with searchview
SearchManager manager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
mSearchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
mSearchView.setSearchableInfo(manager.getSearchableInfo(getComponentName()));
mSearchView.setMaxWidth(Integer.MAX_VALUE);
// Set Listener
mSearchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
// filter when query is submitted
Log.d(TAG, "onQueryTextSubmit: " + query);
notesAdapter.filterList(filter(query,noteList));
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
// filter progressively as query changes
Log.d(TAG, "onQueryTextChange: " + newText);
notesAdapter.filterList(filter(newText,noteList));
return false;
}
});
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId() == R.id.action_search) {
// search action
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onBackPressed() {
// close searchview
if(!mSearchView.isIconified()) {
mSearchView.setIconified(true);
return;
}
super.onBackPressed();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == REQUEST_CODE) {
if (resultCode == 1) {
Log.d(TAG, "Request code is 1");
noteList.add((Note) data.getSerializableExtra("note"));
notesAdapter.notifyDataSetChanged();
}
else if(resultCode == 2) {
Log.d(TAG, "Request code 2, update return");
noteList.set(position, (Note) data.getSerializableExtra("note"));
notesAdapter.notifyDataSetChanged();
}
else if(resultCode == 3) {
Log.d(TAG, "Request code 3, delete return");
Log.d(TAG, "Deleting this from list:" + (Note) data.getSerializableExtra("note"));
noteList.remove(MainActivity.this.position);
notesAdapter.notifyItemRemoved(MainActivity.this.position);
}
}
}
private void displayList() {
notedatabase = Notedatabase.getInstance(MainActivity.this);
new RetrieveTask(this).execute();
}
private void initViews() {
recyclerView = findViewById(R.id.recyclerview);
gridLayoutManager = new StaggeredGridLayoutManager(2,1);
mCoordinatorLayout = findViewById(R.id.coordinatorLayout);
recyclerView.setLayoutManager(gridLayoutManager);
noteList = new ArrayList<>();
multiSelectList = new ArrayList<>();
notesAdapter = new NotesAdapter(noteList,MainActivity.this,multiSelectList);
recyclerView.setAdapter(notesAdapter);
maddbtn = findViewById(R.id.add_fab);
maddbtn.setOnClickListener(v -> {
Intent intent = new Intent(MainActivity.this,NoteActivity.class);
startActivityForResult(intent,REQUEST_CODE);
});
}
@Override
public void onClick(View view, int pos) {
/*
Log.d(TAG, "Recylerview item onClick: ");
MainActivity.this.position = pos;
Intent intent = new Intent(MainActivity.this,NoteActivity.class);
intent.putExtra("note",noteList.get(position));
Log.d(TAG, "list.get(position): " + noteList.get(pos).getDesc());
startActivityForResult(intent,REQUEST_CODE);
*/
}
@Override
public void onClick(Note note) {
/*
Log.d(TAG, "onClick with args as note1");
Intent intent = new Intent(MainActivity.this,NoteActivity.class);
intent.putExtra("note",note);
startActivityForResult(intent,REQUEST_CODE);*/
}
@Override
public void onLongClick(View view, int pos) {
/* Log.d(TAG, "onLongClick ");
if(!isMultiSelect) {
multiSelectList = new ArrayList<Note>();
isMultiSelect = true;
if(mActionMode == null) {
mActionMode = startActionMode(mActionModeCallback);
}
}
multi_select(pos);*/
}
private void multi_select(int pos) {
if(mActionMode != null) {
if(multiSelectList.contains(noteList.get(pos))) {
Log.d(TAG, "multi_select removed: " + multiSelectList.contains(noteList.get(pos)));
multiSelectList.remove(noteList.get(pos));
}
else {
Log.d(TAG, "multi_select added: " + multiSelectList.contains(noteList.get(pos)));
multiSelectList.add(noteList.get(pos));
}
if(multiSelectList.size() > 0) mActionMode.setTitle("" + multiSelectList.size() + " selected");
else mActionMode.setTitle("");
refreshAdapter();
}
}
private void refreshAdapter() {
notesAdapter.selectednotes_list = multiSelectList;
notesAdapter.list = noteList;
notesAdapter.notifyDataSetChanged();
}
class RetrieveTask extends AsyncTask<Void,Void,List<Note>>{
private WeakReference<MainActivity> weakReference;
public RetrieveTask(MainActivity mainActivity) {
weakReference = new WeakReference<>(mainActivity);
}
@Override
protected List<Note> doInBackground(Void... voids) {
if(weakReference.get()!=null)
return weakReference.get().notedatabase.getNoteDao().getNotes();
else
return null;
}
@Override
protected void onPostExecute(List<Note> notes) {
if(notes!=null & notes.size()>0) {
weakReference.get().noteList = notes;
//weakReference.get().noteList.addAll(weakReference.get().getNotes());
Log.d(TAG, "Result: " + notes);
weakReference.get().notesAdapter = new NotesAdapter(notes,weakReference.get(),multiSelectList);
/*
// Randomly set note background
for(Note n:notes) {
n.setColor(getRandomMaterialColor(MainActivity.this,"500"));
}
*/ weakReference.get().recyclerView.addOnItemTouchListener(new RecyclerTouchListener(recyclerView, getApplicationContext(), new ClickListener() {
@Override
public void onClick(View view, int pos) {
if (isMultiSelect)
multi_select(pos);
else {
Log.d(TAG, "Recylerview item onClick: ");
MainActivity.this.position = pos;
Intent intent = new Intent(MainActivity.this, NoteActivity.class);
intent.putExtra("note", noteList.get(position));
Log.d(TAG, "list.get(position): " + weakReference.get().noteList.get(position).getDesc());
startActivityForResult(intent, REQUEST_CODE);
}
}
@Override
public void onClick(Note note) {
Log.d(TAG, "onClick with args as note");
Intent intent = new Intent(MainActivity.this, NoteActivity.class);
intent.putExtra("note", note);
startActivityForResult(intent, REQUEST_CODE);
}
@Override
public void onLongClick(View view, int pos) {
Log.d(TAG, "onLongClick ");
if(!isMultiSelect) {
multiSelectList = new ArrayList<Note>();
isMultiSelect = true;
if(mActionMode == null) {
mActionMode = startActionMode(mActionModeCallback);
}
}
multi_select(pos);
}
}));
weakReference.get().recyclerView.setAdapter(weakReference.get().notesAdapter);
weakReference.get().notesAdapter.notifyDataSetChanged();
}
else{
displayErrorMsg();
}
}
}
private ActionMode.Callback mActionModeCallback = new ActionMode.Callback() {
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
//Prepare the menu
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.contextual_action,menu);
context_menu = menu;
return true;
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
//mode.getCustomView().setBackgroundColor(getApplicationContext().getResources().getColor(android.R.color.white));
return false;
}
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch (item.getItemId()) {
case R.id.action_delete:
// display alert dialog
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setMessage("Delete " + multiSelectList.size() + " notes?");
builder.setCancelable(true);
builder.setPositiveButton(R.string.alert_yes,(dialog, which) -> {
// Deleting notes
for (int i = 0; i < multiSelectList.size(); i++) {
Log.d(TAG, "Deleting: " + multiSelectList.get(i));
notedatabase.getNoteDao().deleteNotes(multiSelectList.get(i));
noteList.remove(multiSelectList.get(i));
}
// Display Snackbar
displaySnackbar(mCoordinatorLayout,R.string.delete_success);
dialog.cancel();
// Refresh adapter
refreshAdapter();
// dismiss the contextual action bar
if(mActionMode!=null) mActionMode.finish();
});
builder.setNegativeButton(R.string.alert_no,(dialog, which) -> {
dialog.cancel();
if(mActionMode!=null) mActionMode.finish();
});
builder.setOnCancelListener(dialog1 -> {
Log.d(TAG, "onCancelListener: ");
if(mActionMode!=null) mActionMode.finish();
});
AlertDialog dialog = builder.create();
dialog.show();
return true;
default:
return false;
}
}
@Override
public void onDestroyActionMode(ActionMode mode) {
mActionMode = null;
isMultiSelect = false;
multiSelectList = new ArrayList<Note>();
refreshAdapter();
}
};
@Override
protected void onDestroy() {
notedatabase.cleanUp();
super.onDestroy();
}
private void displayErrorMsg() {
Toast.makeText(MainActivity.this,R.string.failure_display,Toast.LENGTH_SHORT).show();
}
}
任何帮助都广受赞赏！！ 请！严重卡在这里
答案 0 :(得分：0)
发现了！ 我没有存储过滤器的结果，而是直接在filterList中调用它。
noteList = filter(newText, noteList);
notesAdapter.filterList(noteList);
以上几行为我做到了！