how to add second column value of same or other table in another spinner from sqlite database using button click in android studio
retrievebtn.setOnClickListener(arg0 -> {
// TODO Auto-generated method stub
nos.clear();
names.clear();
//OPEN
db.openDB();
//RETRIEVE
Cursor c = db.getAllValues();
c.moveToFirst();
while(!c.isAfterLast())
{
String no = c.getString(0);
nos.add(no);
String name = c.getString(1);
names.add(name);
c.moveToNext();
}
//CLOSE
c.close();
db.close();
//SET IT TO SPINNER
sp1.setAdapter(adapter);
sp2.setAdapter(adapter);
});
CodePudding user response：
Perhaps consider the following working example.
This consists of 2 spinners and 3 buttons. The buttons controlling from which of the 3 tables the data is extracted for the 2nd spinner.
The trick, as such, used is to use AS to utilise a standard column name, irrespective of the actual column name. The one difference is that this rather than using a normal adapter, it utilises a CursorAdapter (SimpleCursorAdapter as it's quite flexible) and thus you can extract the data directly.
First the SQLite side i.e. the class that extends SQLiteOpenHelper :-
class DBHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "the_database.db";
public static final int DATABASE_VERSION = 1;
public static final String TABLE1_TABLE = "_table1";
public static final String TABLE1_ID_COL = BaseColumns._ID;
public static final String TABLE1_NAME_COL = "_name";
public static final String TABLE1_DESC_COL = "_desc";
private static final String TABLE1_CREATE_SQL =
"CREATE TABLE IF NOT EXISTS " TABLE1_TABLE "("
TABLE1_ID_COL " INTEGER PRIMARY KEY"
"," TABLE1_NAME_COL " TEXT UNIQUE"
"," TABLE1_DESC_COL " TEXT "
");";
public static final String TABLE2_TABLE = "_table2";
public static final String TABLE2_ID_COL = BaseColumns._ID;
public static final String TABLE2_TABLE1_ID_MAP_COL = "_table1_id_map";
public static final String TABLE2_NAME_COL = "_name";
private static final String TABLE2_CREATE_SQL =
"CREATE TABLE IF NOT EXISTS " TABLE2_TABLE "("
TABLE2_ID_COL " INTEGER PRIMARY KEY"
"," TABLE2_TABLE1_ID_MAP_COL " INTEGER "
"," TABLE2_NAME_COL " TEXT"
");";
public static final String TABLE3_TABLE = "_table3";
public static final String TABLE3_ID_COL = BaseColumns._ID;
public static final String TABLE3_TABLE2_ID_MAP_COL = "_table2_id_map";
public static final String TABLE3_NAME_COL = "_name";
private static final String TABLE3_CREATE_SQL =
"CREATE TABLE IF NOT EXISTS " TABLE3_TABLE "("
TABLE3_ID_COL " INTEGER PRIMARY KEY"
"," TABLE3_TABLE2_ID_MAP_COL " INTEGER "
"," TABLE3_NAME_COL " TEXT "
");";
private static volatile DBHelper INSTANCE;
private SQLiteDatabase db;
public static final String SPINNER_COLUMN1 = "_spc1";
public static final String SPINNER_COLUMN2 = "_spc2";
private DBHelper(Context context) {
super(context,DATABASE_NAME,null,DATABASE_VERSION);
db = this.getWritableDatabase();
}
public static DBHelper getInstance(Context context) {
if (INSTANCE==null) {
INSTANCE = new DBHelper(context);
}
return INSTANCE;
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(TABLE1_CREATE_SQL);
db.execSQL(TABLE2_CREATE_SQL);
db.execSQL(TABLE3_CREATE_SQL);
}
@Override
public void onUpgrade(SQLiteDatabase db, int i, int i1) {
}
public long insertTable1Row(String name,String description) {
ContentValues cv = new ContentValues();
cv.put(TABLE1_NAME_COL,name);
cv.put(TABLE1_DESC_COL,description);
return db.insert(TABLE1_TABLE,null,cv);
}
public long insertTable2Row(String name, long table1_id) {
ContentValues cv = new ContentValues();
cv.put(TABLE2_NAME_COL,name);
cv.put(TABLE2_TABLE1_ID_MAP_COL,table1_id);
return db.insert(TABLE2_TABLE,null,cv);
}
public long insertTable3Row(String name, long table2_id) {
ContentValues cv = new ContentValues();
cv.put(TABLE3_NAME_COL,name);
cv.put(TABLE3_TABLE2_ID_MAP_COL,table2_id);
return db.insert(TABLE3_TABLE,null,cv);
}
public Cursor getSpinnerData(String table, long map) {
String[] columns = new String[]{};
String whereClause = "";
String[] whereArgs = new String[]{String.valueOf(map)};
switch (table) {
case TABLE1_TABLE:
columns = new String[]{TABLE1_ID_COL,TABLE1_NAME_COL " AS " SPINNER_COLUMN1,TABLE1_DESC_COL " AS " SPINNER_COLUMN2};
whereClause = "";
break;
case TABLE2_TABLE:
columns = new String[]{TABLE2_ID_COL ,TABLE2_NAME_COL " AS " SPINNER_COLUMN1,"'-' AS " SPINNER_COLUMN2};
whereClause = TABLE2_TABLE1_ID_MAP_COL "=?";
break;
case TABLE3_TABLE:
columns = new String[]{TABLE3_ID_COL, TABLE3_NAME_COL " AS " SPINNER_COLUMN1,"'~' AS " SPINNER_COLUMN2};
whereClause = TABLE3_TABLE2_ID_MAP_COL "=?";
break;
}
if (map < 0) {
whereClause="";
whereArgs = new String[]{};
}
if (columns.length > 0) {
return db.query(table,columns,whereClause,whereArgs,null,null,null);
} else {
return db.query(TABLE1_TABLE,new String[]{"0 AS " TABLE1_ID_COL ",'ooops' AS " SPINNER_COLUMN1,"'ooops' AS " SPINNER_COLUMN2},null,null,null,null,null,"1");
}
}
}
- as said there are three tables
- a singleton approach has been utilised for the DBHelper
- the most relevant aspect in regards to switching spinner data is the
getSpinnerDatafunction, which takes two parameters, the most relevant being the first the tablename which drives the resultant query. - Note the use of BaseColumns._ID ALL Cursor adapters must have a column name _id (which is what BaseColumns._ID resolves to). The column should be an integer value that uniquely identifies the row.
- the 2nd parameter caters for the selection of only related data, but a negative is used to ignore this aspect.
The Activity "MainActivity" used to demonstrate is :-
public class MainActivity extends AppCompatActivity {
Button btn1, btn2, btn3;
Spinner sp1,sp2;
String[] spinnerColumns = new String[]{DBHelper.SPINNER_COLUMN1,DBHelper.SPINNER_COLUMN2};
SimpleCursorAdapter sca1,sca2;
String sp1_table_name = DBHelper.TABLE1_TABLE;
String sp2_table_name = DBHelper.TABLE2_TABLE;
Cursor csr1, csr2;
DBHelper dbHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn1 = this.findViewById(R.id.button1);
btn2 = this.findViewById(R.id.button2);
btn3 = this.findViewById(R.id.button3);
sp1 = this.findViewById(R.id.spinner1);
sp2 = this.findViewById(R.id.spinner2);
dbHelper = DBHelper.getInstance(this);
Cursor test4Data = dbHelper.getWritableDatabase().query(DBHelper.TABLE1_TABLE,null,null,null,null,null,null, "1");
if (test4Data.getCount() < 1) {
addSomeData();
}
test4Data.close();
sp1_table_name = DBHelper.TABLE1_TABLE;
sp2_table_name = DBHelper.TABLE2_TABLE;
setUpButtons();
setOrRefreshSpinner1();
setOrRefreshSpinner2();
}
void setUpButtons() {
btn1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
sp2_table_name = DBHelper.TABLE1_TABLE;
setOrRefreshSpinner2();
setOrRefreshSpinner1();
}
});
btn2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
sp2_table_name = DBHelper.TABLE2_TABLE;
setOrRefreshSpinner2();
setOrRefreshSpinner1();
}
});
btn3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
sp2_table_name = DBHelper.TABLE3_TABLE;
setOrRefreshSpinner2();
setOrRefreshSpinner1();
}
});
}
void setOrRefreshSpinner1() {
csr1 = dbHelper.getSpinnerData(sp1_table_name,-1);
if (sca1==null) {
sca1 = new SimpleCursorAdapter(
this,
android.R.layout.simple_list_item_2,
csr1,
spinnerColumns,
new int[]{android.R.id.text1, android.R.id.text2},0
);
sp1.setAdapter(sca1);
} else {
sca1.swapCursor(csr1);
}
}
void setOrRefreshSpinner2() {
csr2 = dbHelper.getSpinnerData(sp2_table_name,-1);
if (sca2==null) {
sca2 = new SimpleCursorAdapter(
this,
android.R.layout.simple_list_item_2,
csr2,
spinnerColumns,
new int[]{android.R.id.text1, android.R.id.text2},0
);
sp2.setAdapter(sca2);
} else {
sca2.swapCursor(csr2);
}
}
private void addSomeData() {
long n1 = dbHelper.insertTable1Row("NAME001","The first name.");
long n2 = dbHelper.insertTable1Row("NAME002","The second name.");
long n3 = dbHelper.insertTable1Row("NAME003","The third name");
long t2n1 = dbHelper.insertTable2Row("CHILDNAME001",n1);
long t2n2 = dbHelper.insertTable2Row("CHILDNAME002",n2);
long t2n3 = dbHelper.insertTable2Row("CHILDNAME003", n3);
dbHelper.insertTable3Row("GRANDCHILDNAME001",t2n1);
dbHelper.insertTable3Row("GRANDCHILDNAME002",t2n1);
dbHelper.insertTable3Row("GRANDCHILDNAME003",t2n1);
dbHelper.insertTable3Row("GRANDCHILDNAME004",t2n2);
dbHelper.insertTable3Row("GRANDCHILDNAME005",t2n3);
}
}
Result
The above when run starts of with :-
With the first spinner dropdown shown :-
With the second spinner dropdown shown :-
If Button1 is clicked then both spinners (i.e. spinner2 has been changed to select data from Table1 rather than Table2) show data from Table1 (useless but for demonstration) :-
If Button3 is clicked then data from Table3 is displayed in the second spinner:-
Clicking Button2 shows data from Table2.
Of course the principle could be applied in many different ways.
CodePudding user response：
my adapters were not set so I made below changes and got expected result.
//RETERIEVE
retrievebtn.setOnClickListener(arg0 -> {
// TODO Auto-generated method stub
nos.clear();
names.clear();
//OPEN
db.openDB();
//RETRIEVE
Cursor c = db.getAllValues();
c.moveToFirst();
while(!c.isAfterLast())
{
String no = c.getString(0);
nos.add(no);
String name = c.getString(1);
names.add(name);
c.moveToNext();
}
//CLOSE
c.close();
db.close();
//SET IT TO SPINNER
ArrayAdapter<String> adapter1 = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, nos);
ArrayAdapter<String> adapter2 = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, names);
sp1.setAdapter(adapter1);
sp2.setAdapter(adapter2);
});