[英]How to make Material CardView, Checkable, in RecyclerView
我已經制作了一個 android 筆記應用程序,我想制作 Note Material CardView, Checkable。 我想要這種行為。 當我長按每個音符時,每個音符都會被選中/選中(根據材料設計 cardview setChecked 行為選中)。
它是一個帶有 RecyclerView 和實現注釋的 Room 持久化數據庫。 每個筆記布局都是一個 Material CardView。 我有一個名為“NotesAdapter”的適配器、一個模型實體“Note”和一個名為“MyNotesActivity”的主活動。 當然我還有一些文件,但我沒有包括它們,因為沒有把整個項目都給你看。 如果你想請求他們,我會為你提出問題。
我試過這個,但它不能正常工作。 在 NotesAdapter 中,“noteHolder.noteCardView.toggle();”行
noteHolder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
//When long clicking(holding click) on note(note title, note body text, note date).
listener.onNoteLongClick(note);
noteHolder.noteCardView.toggle();
return true;
}
});
當我長按它時它確實被選中,但是當我向下滾動時,其他一些筆記也會被選中。
前任。
https://gfycat.com/incomparablepowerfullarva
我的“NotesAdapter.java”代碼:
//implements Filterable is for some other feature, that has nothing to do with this question.
public class NotesAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements Filterable {
public ArrayList<Note> notes;
public ArrayList<Note> notesFull;
private Context context;
private NoteEventListener listener;
private DeleteThisNoteListener deleteThisNoteListener;
public NotesAdapter(ArrayList<Note> notes, Context context, DeleteThisNoteListener deleteThisNoteListener) {
this.notes = notes;
this.context = context;
this.deleteThisNoteListener = deleteThisNoteListener;
notesFull = new ArrayList<>(notes);
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(context).inflate(R.layout.note_layout, parent, false);
return new NoteHolder(v);
}
//Displays data at specified position.
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
final NoteHolder noteHolder = (NoteHolder) holder;
final Note note = getNote(position);
if (note != null) {
//Entering text to each Text fields.
noteHolder.noteTitle.setText(note.getNoteTitle());
noteHolder.noteBodyText.setText(note.getNoteBodyText());
noteHolder.noteDate.setText(NoteUtils.dateFromLong(note.getNoteDate()));
noteHolder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
//When long clicking(holding click) on note(note title, note body text, note date).
listener.onNoteLongClick(note);
noteHolder.noteCardView.toggle();
return true;
}
});
noteHolder.moreMenu.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
deleteThisNoteListener.onDeleteThisNoteClick(note, view, noteHolder.getBindingAdapterPosition());
}
});
}
}
//Gets the particular note and its position.
public Note getNote(int position) {
return notes.get(position);
}
//Gets how many notes are there.
@Override
public int getItemCount() {
return notes.size();
}
//setListener sets all listeners
public void setListener(NoteEventListener listener, DeleteThisNoteListener deleteThisNoteListener) {
this.listener = listener;
this.deleteThisNoteListener = deleteThisNoteListener;
}
static class NoteHolder extends RecyclerView.ViewHolder {
TextView noteTitle, noteBodyText, noteDate;
MaterialButton moreMenu;
MaterialCardView noteCardView;
public NoteHolder(@NonNull View itemView) {
super(itemView);
noteCardView = itemView.findViewById(R.id.note);
noteTitle = itemView.findViewById(R.id.note_title);
noteBodyText = itemView.findViewById(R.id.note_body_text);
noteDate = itemView.findViewById(R.id.note_date);
moreMenu = itemView.findViewById(R.id.more_menu_button);
}
}
}
我的“MyNotesActivity.java”
public class MyNotesActivity extends AppCompatActivity implements NoteEventListener, DeleteThisNoteListener {
private MaterialToolbar searchTopBar;
private MaterialToolbar pageTitleTopBar;
private MaterialToolbar selectNotesTopBar;
private NotesDAO dao;
private NotesAdapter adapter;
private RecyclerView recyclerView;
private LinearLayoutManager layoutManager;
public static final String TAG = "MyNotie";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_notes);
BottomAppBar bottomAppBar = findViewById(R.id.bottom_app_bar);
setSupportActionBar(bottomAppBar);
layoutManager = new LinearLayoutManager(this);
recyclerView = findViewById(R.id.notes_list);
recyclerView.setLayoutManager(layoutManager);
dao = NotesDB.getInstance(this).notesDAO();
FloatingActionButton add_new_note_button = findViewById(R.id.add_new_note);
add_new_note_button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
addNotes("This is a test note.", "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin et ante quis nibh blandit vehicula non sit amet dui.");
addNotes("New note!", "Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.");
addNotes("Check this new note!", "Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.");
addNotes("Cool note!", "Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.");
addNotes("Wrote it all down!", "Nullam imperdiet placerat porttitor. Ut ac urna sed magna gravida eleifend. ");
loadNotes();
}
});
recyclerView.addOnScrollListener(onScrollListener);
}
private void addNotes(String noteTitle, String noteBodyText) {
for (int i=0; i<2; i++) {
Note testNote = new Note();
long date = new Date().getTime();
testNote.setNoteTitle(noteTitle);
testNote.setNoteBodyText(noteBodyText);
testNote.setNoteDate(date);
dao.insertNote(testNote);
adapter.notesFull.add(testNote);
adapter.notes.add(testNote);
}
}
//When resuming the app while on sleep or opening the app this onResume
method is called.
@Override
protected void onResume() {
super.onResume();
loadNotes(); //loads/reloads notes from database.
}
}
我的模型“Note.java”:
@Entity(tableName = "notes")
public class Note {
@PrimaryKey(autoGenerate = true)
private int id;
@ColumnInfo(name = "isNewNote")
private Boolean isNewNote = true;
@ColumnInfo(name = "noteTitle")
private String noteTitle;
@ColumnInfo(name = "text")
private String noteBodyText;
@ColumnInfo(name = "date")
private long noteDate;
public Note() {
}
public String getNoteTitle() {
return noteTitle;
}
public void setNoteTitle(String noteTitle) {
this.noteTitle = noteTitle;
}
public String getNoteBodyText() {
return noteBodyText;
}
public void setNoteBodyText(String noteBodyText) {
this.noteBodyText = noteBodyText;
}
public long getNoteDate() {
return noteDate;
}
public void setNoteDate(long noteDate) {
this.noteDate = noteDate;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@NonNull
public Boolean getIsNewNote() {
return isNewNote;
}
public void setIsNewNote(@NonNull Boolean newNote) {
isNewNote = newNote;
}
@NonNull
@Override
public String toString() {
return "Note{" +
"id=" + id +
", noteDate=" + noteDate +
'}';
}
}
請給我建議,因為我找不到任何有效的解決方案......提前謝謝你!
其實我明白了! 我從這個人那里得到了這個想法: https : //stackoverflow.com/a/40551984/7187975當他展示他的 RecyclerViewAdapter 和模型並在 RecyclerViewAdapter 中看到這個時:
holder.view.setBackgroundColor(model.isSelected() ? Color.CYAN : Color.WHITE);
holder.textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
model.setSelected(!model.isSelected());
holder.view.setBackgroundColor(model.isSelected() ? Color.CYAN : Color.WHITE);
}
});
我做了這個:“NotesAdapter.java”
noteHolder.noteCardView.setChecked(note.isChecked());
noteHolder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
//When long clicking(holding click) on note(note title, note body text,
note date).
note.setChecked(!note.isChecked());
noteHolder.noteCardView.setChecked(note.isChecked());
return true;
}
});
並在模型“Note.java”中添加了getter、“isChecked”和setter“setChecked”
public class Note {
//The rest that are not mentioned, remain unchanged.
@Ignore
private boolean isChecked;
public boolean isChecked() {
return isChecked;
}
public void setChecked(boolean checked) {
isChecked = checked;
}
}
這解決了它! 我希望這會幫助其他人! 它可能不是很好,但我希望它會有所幫助! 謝謝你看到這個帖子!
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