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ListViewをRecyclerViewに変更したいと思います。ここに私の主な活動である：ここではListViewからRecyclerViewに切り替える
Button btnAdd, btnGetAll;
TextView note_Id;
@Override
public void onClick(View view) {
if (view == findViewById(R.id.btnAdd)) {
Intent intent = new Intent(this, NoteDetail.class);
intent.putExtra("note_Id", 0);
startActivity(intent);
} else {
NoteRepo repo = new NoteRepo(this);
ArrayList<HashMap<String, String>> noteList = repo.getNoteList();
if (noteList.size() != 0) {
ListView lv = getListView();
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
note_Id = (TextView) view.findViewById(R.id.note_Id);
String noteId = note_Id.getText().toString();
Intent objIndent = new Intent(getApplicationContext(), NoteDetail.class);
objIndent.putExtra("note_Id", Integer.parseInt(noteId));
startActivity(objIndent);
}
});
ListAdapter adapter = new SimpleAdapter(MainActivity.this, noteList, R.layout.view_note_entry, new String[]{"id", "title"}, new int[]{R.id.note_Id, R.id.note_title});
setListAdapter(adapter);
} else {
Toast.makeText(this, "No note!", Toast.LENGTH_SHORT).show();
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnAdd = (Button) findViewById(R.id.btnAdd);
btnAdd.setOnClickListener(this);
btnGetAll = (Button) findViewById(R.id.btnGetAll);
btnGetAll.setOnClickListener(this);
}
は私NoteDetailクラスである：ここでは
Button btnSave , btnDelete;
Button btnClose;
EditText editTextTitle;
EditText editTextNote;
private int _Note_Id=0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_note_detail);
btnSave = (Button) findViewById(R.id.btnSave);
btnDelete = (Button) findViewById(R.id.btnDelete);
btnClose = (Button) findViewById(R.id.btnClose);
editTextTitle = (EditText) findViewById(R.id.editTextTitle);
editTextNote = (EditText) findViewById(R.id.editTextNote);
btnSave.setOnClickListener(this);
btnDelete.setOnClickListener(this);
btnClose.setOnClickListener(this);
_Note_Id =0;
Intent intent = getIntent();
_Note_Id =intent.getIntExtra("note_Id", 0);
NoteRepo repo = new NoteRepo(this);
Note note = new Note();
note = repo.getNoteById(_Note_Id);
editTextTitle.setText(note.title);
editTextNote.setText(note.note);
}
public void onClick(View view) {
if (view == findViewById(R.id.btnSave)){
NoteRepo repo = new NoteRepo(this);
Note note = new Note();
note.note=editTextNote.getText().toString();
note.title=editTextTitle.getText().toString();
note.note_ID=_Note_Id;
if (_Note_Id==0){
_Note_Id = repo.insert(note);
Toast.makeText(this,"New Note Insert",Toast.LENGTH_SHORT).show();
}else{
repo.update(note);
Toast.makeText(this,"Note Record updated",Toast.LENGTH_SHORT).show();
}
}else if (view== findViewById(R.id.btnDelete)){
NoteRepo repo = new NoteRepo(this);
repo.delete(_Note_Id);
Toast.makeText(this, "Note Record Deleted", Toast.LENGTH_SHORT);
finish();
}else if (view== findViewById(R.id.btnClose)){
finish();
}
}
は私NoteRepoクラスです：
public NoteRepo(Context context) {
dbHelper = new DBHelper(context);
}
public int insert(Note note) {
//Open connection to write data
SQLiteDatabase db = dbHelper.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(Note.KEY_note,note.note);
values.put(Note.KEY_title, note.title);
// Inserting Row
long note_Id = db.insert(Note.TABLE, null, values);
db.close(); // Closing database connection
return (int) note_Id;
}
public void delete(int note_Id) {
SQLiteDatabase db = dbHelper.getWritableDatabase();
// It's a good practice to use parameter ?, instead of concatenate string
db.delete(Note.TABLE, Note.KEY_ID + "= ?", new String[] { String.valueOf(note_Id) });
db.close(); // Closing database connection
}
public void update(Note note) {
SQLiteDatabase db = dbHelper.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(Note.KEY_note,note.note);
values.put(Note.KEY_title, note.title);
// It's a good practice to use parameter ?, instead of concatenate string
db.update(Note.TABLE, values, Note.KEY_ID + "= ?", new String[] { String.valueOf(note.note_ID) });
db.close(); // Closing database connection
}
public ArrayList<HashMap<String, String>> getNoteList() {
//Open connection to read only
SQLiteDatabase db = dbHelper.getReadableDatabase();
String selectQuery = "SELECT " +
Note.KEY_ID + "," +
Note.KEY_title + "," +
Note.KEY_note +
" FROM " + Note.TABLE;
//Note note = new Note();
ArrayList<HashMap<String, String>> noteList = new ArrayList<HashMap<String, String>>();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
HashMap<String, String> note = new HashMap<String, String>();
note.put("id", cursor.getString(cursor.getColumnIndex(Note.KEY_ID)));
note.put("title", cursor.getString(cursor.getColumnIndex(Note.KEY_title)));
noteList.add(note);
} while (cursor.moveToNext());
}
cursor.close();
db.close();
return noteList;
}
public Note getNoteById(int Id){
SQLiteDatabase db = dbHelper.getReadableDatabase();
String selectQuery = "SELECT " +
Note.KEY_ID + "," +
Note.KEY_title + "," +
Note.KEY_note +
" FROM " + Note.TABLE
+ " WHERE " +
Note.KEY_ID + "=?";// It's a good practice to use parameter ?, instead of concatenate string
int iCount =0;
Note note = new Note();
Cursor cursor = db.rawQuery(selectQuery, new String[] { String.valueOf(Id) });
if (cursor.moveToFirst()) {
do {
note.note_ID =cursor.getInt(cursor.getColumnIndex(Note.KEY_ID));
note.title =cursor.getString(cursor.getColumnIndex(Note.KEY_title));
note.note =cursor.getString(cursor.getColumnIndex(Note.KEY_note));
} while (cursor.moveToNext());
}
cursor.close();
db.close();
return note;
}
は私DBHelperクラスです：
private static final int DATABASE_VERSION = 4;
// Database Name
private static final String DATABASE_NAME = "crud.db";
public DBHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
//All necessary tables you like to create will create here
String CREATE_TABLE_NOTE = "CREATE TABLE " + Note.TABLE + "("
+ Note.KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT ,"
+ Note.KEY_title + " TEXT, "
+ Note.KEY_note + " TEXT)";
db.execSQL(CREATE_TABLE_NOTE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed, all data will be gone!!!
db.execSQL("DROP TABLE IF EXISTS " + Note.TABLE);
// Create tables again
onCreate(db);
}
RecyclerViewに切り替えても、自分のデータベースへのアクセスを維持するにはどうすればよいですか？助言がありますか？
あなたはあなたの質問にアイテムのレイアウトファイルを添付してください。 – Razor