case 0:
return;
case 1:
Intent intentNew1 = new Intent(this, Main2Activity.class);
startActivity(intentNew1);
return;
case 2:
Intent intentNew2 = new Intent(this, Main3Activity.class);
startActivity(intentNew2);
return;
case 3:
//и так далее
String create_products_table = "CREATE TABLE " + TABLE_PRODUCTS + " (" +
COLUMN_ID + " INTEGER PRIMARY KEY, " + COLUMN_PRODUCTNAME + " TEXT," +
COLUMN_COAST + " INTEGER, " + COLUMN_INCOME + " INTEGER)";