So, at the moment I have a spinner which is populated from a database table. At the moment when using the spinner, the first value that is in the spinner is just the first from the database which isn't really ideal.
Is there a nice way for the spinner to start blank without having to insert a blank record or anything?
Well, you can use the attribute prompt of the Spinner view, whether android:prompt="whatever" or setPrompt("whatever")
I hope this helps
Sorry, I misread, I don't know of any way of not showing an initial value without having to add an empty value. You will have to provide an item that corresponds to the "no choice" value.
So it looks like this isn't very possible, instead I've gone for a different method of adding a row at position 1 in the database with a name that I choose, and modified a query so that field can't be deleted.
If you want, there is a decorater spinnerAdapter witch add automatically a default value :
protected class SpinnerAdapterWithNoValue implements SpinnerAdapter {
private SpinnerAdapter _current;
private final static String defaultValue = "Choisir";
public SpinnerAdapterWithNoValue(SpinnerAdapter base) {
_current = base;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return _current.getCount()+1;
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
if(arg0 == 0 || arg0 == -1)
{
return null;
}
return _current.getItem(arg0-1);
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
if(arg0 == 0 || arg0 == -1)
{
return -1;
}
return _current.getItemId(arg0-1);
}
@Override
public int getItemViewType(int arg0) {
// TODO Auto-generated method stub
if(arg0 == 0 || arg0 == -1)
{
return -1;
}
return _current.getItemViewType(arg0-1);
}
@Override
public View getView(int arg0, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if(arg0 == 0 || arg0 == -1)
{
final TextView v = (TextView) ((LayoutInflater)getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE))
.inflate(R.layout.spinner_text,parent,false);
v.setText(defaultValue);
return v;
}
return _current.getView(arg0-1, convertView, parent);
}
@Override
public int getViewTypeCount() {
// TODO Auto-generated method stub
return _current.getViewTypeCount();
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return _current.hasStableIds();
}
@Override
public boolean isEmpty() {
// TODO Auto-generated method stub
return _current.isEmpty();
}
@Override
public void registerDataSetObserver(DataSetObserver arg0) {
// TODO Auto-generated method stub
_current.registerDataSetObserver(arg0);
}
@Override
public void unregisterDataSetObserver(DataSetObserver arg0) {
// TODO Auto-generated method stub
_current.unregisterDataSetObserver(arg0);
}
@Override
public View getDropDownView(int arg0, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if(arg0 == 0 || arg0 == -1)
{
CheckedTextView v = (CheckedTextView)((LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(android.R.layout.simple_spinner_dropdown_item,parent,false);
v.setText(defaultValue);
return v;
}
return _current.getDropDownView(arg0-1, convertView, parent);
}
}
Then you can create your own spinner using this decorater :
public class SpinnerWithNoValue extends Spinner {
public SpinnerWithNoValue(Context context) {
super(context);
}
public SpinnerWithNoValue(Context context, AttributeSet attrs) {
super(context, attrs);
}
public SpinnerWithNoValue(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public void setAdapter(SpinnerAdapter orig ) {
final SpinnerAdapter adapter = new SpinnerAdapterWithNoValue(orig);
super.setAdapter(adapter);
try {
final Method m = AdapterView.class.getDeclaredMethod("setNextSelectedPositionInt",int.class);
m.setAccessible(true);
m.invoke(this,-1);
final Method n = AdapterView.class.getDeclaredMethod("setSelectedPositionInt",int.class);
n.setAccessible(true);
n.invoke(this,-1);
} catch( Exception e ) {
throw new RuntimeException(e);
}
}
/*
* getSelectedItem
* renvoi null si la valeur par defaut est séléctionnée
* @see android.widget.AdapterView#getSelectedItem()
*/
@Override
public Object getSelectedItem()
{
return super.getSelectedItem();
}
}
You just have to change the spinner declaration in your xml layout :
com.myproject.SpinnerWithNoValue
If you want, you can change the code to set the default text in the tag of your spinner.
If the selected value is the default value, getItem will return null and getItemId will return -1
