public class MainActivity extends AppCompatActivity {
DbHelper helper =new DbHelper(this);
RecyclerView recyclerView;
Map<Integer, myCustomObject> listp = new TreeMap<>();
Adapter_principale adapter_principale = new Adapter_principale(this, R.layout.row_principale, listp);
@<a rel="nofollow" href="https://www.androidiani.com/forum/members/override.html" target="_blank">Override</a>
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
db= helper.getReadableDatabase();
recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
final Map<Integer, myCustomObject> listp = new TreeMap<>();
final Adapter_principale adapter_principale = new Adapter_principale(this, R.layout.row_principale, listp);
Cursor r = db.rawQuery("SELECT * FROM contatore",null);
listp.put(i, new myCustomObject(r.getString(1), i));
Cursor a = db.rawQuery("SELECT * FROM promemoria WHERE idcont=?", new String[]{r.getString(0)});
listp.get(j).setText2(a.getInt(1));
adapter_principale.clear();
adapter_principale.notifyDataSetChanged();
adapter_principale.add(listp);
recyclerView.setAdapter(adapter_principale);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
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public void onClick(View view) {
intent = new Intent(getApplicationContext(), Add.class)
.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);