<select>
<option value="42">Volvo</option>
<option value="24">Ford</option>
</select>
Android makes this a little tricky as it doesn't offer the same functionality, but using a hashmap provides a good way to go keep a map of options and their corresponding value.
private String[] arrMuppetNames = {"Kermit","Gonzo","Fuzzy","Animal"};
HashMap<String, Integer> hashMuppets = new HashMap<String, Integer>();
Setting up the hashmap is fairly trivial using the put method. In this example I used a set of if statements with hard coded values. Normally you'd get your values from a web service or a db call.
One problem I encountered with this method is when you setup your OnItemSelectedListener it will get fired immediately when you start your application. Technically this is correct as something has been selected onLoad, but not normally desirable activity. So to combat this I've added in a --please select-- value and ignored this element. This is fairly common practice in HTML and works in Android too.
So this is the function that builds the spinner, note we're creating a new array with the zero value set to --please select--.
private void setSpinnerContent(String arrMuppets[]){
Spinner spinner = (Spinner) findViewById(R.id.muppets_spinner);
String arrNewArray[] = new String[arrMuppets.length + 1];
//Add please select to spinner
arrNewArray[0] = this.getString(R.string.select_please);
for(int i=0; i < arrMuppets.length; i++){
arrNewArray[i+1] = arrMuppets[i];
}
//Application of the Array to the Spinner
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(
this,
android.R.layout.simple_spinner_item,
arrNewArray
);
spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(spinnerArrayAdapter);
}
Then last of course is the selected item listener
private Spinner.OnItemSelectedListener spinnerListener = new Spinner.OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,int arg2, long arg3) {
Spinner my_spinner = (Spinner) findViewById(R.id.muppets_spinner);
//arg 3 is index, if 0 it means they clicked "--please select--"
if(arg3 != 0){
//get selected content
String strName = my_spinner.getSelectedItem().toString();
//use hasmap to translate that into a corresponding id.
int intCatID = hashMuppets.get(strName);
Toast.makeText(getApplicationContext(), String.valueOf(intCatID), Toast.LENGTH_SHORT).show();
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
//this is what happens if we select nothing.
return;
}
};
As you can see, we ignore the --please select-- and then call the hashmap to get the value.
Easy! Here's the full code:
http://pastebin.com/kVxwEHgm
