Android : Fill Spinner From Java Code Programmatically
// you need to have a list of data that you want the spinner to display
List<String> spinnerArray = new ArrayList<String>();
spinnerArray.add("item1");
spinnerArray.add("item2");
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
this, android.R.layout.simple_spinner_item, spinnerArray);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
Spinner sItems = (Spinner) findViewById(R.id.spinner1);
sItems.setAdapter(adapter);
also to find out what is selected you could do something like this
String selected = sItems.getSelectedItem().toString();
if (selected.equals("what ever the option was")) {
}
Here is an example to fully programmatically:
- init a Spinner.
- fill it with data via a String List.
- resize the Spinner and add it to my View.
- format the Spinner font (font size, colour, padding).
- clear the Spinner.
- add new values to the Spinner.
- redraw the Spinner.
I am using the following class vars:
Spinner varSpinner;
List<String> varSpinnerData;
float varScaleX;
float varScaleY;
A - Init and render the Spinner (varRoot is a pointer to my main Activity):
public void renderSpinner() {
List<String> myArraySpinner = new ArrayList<String>();
myArraySpinner.add("red");
myArraySpinner.add("green");
myArraySpinner.add("blue");
varSpinnerData = myArraySpinner;
Spinner mySpinner = new Spinner(varRoot);
varSpinner = mySpinner;
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(varRoot, android.R.layout.simple_spinner_item, myArraySpinner);
spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); // The drop down vieww
mySpinner.setAdapter(spinnerArrayAdapter);
B - Resize and Add the Spinner to my View:
FrameLayout.LayoutParams myParamsLayout = new FrameLayout.LayoutParams(
FrameLayout.LayoutParams.MATCH_PARENT,
FrameLayout.LayoutParams.WRAP_CONTENT);
myParamsLayout.gravity = Gravity.NO_GRAVITY;
myParamsLayout.leftMargin = (int) (100 * varScaleX);
myParamsLayout.topMargin = (int) (350 * varScaleY);
myParamsLayout.width = (int) (300 * varScaleX);;
myParamsLayout.height = (int) (60 * varScaleY);;
varLayoutECommerce_Dialogue.addView(mySpinner, myParamsLayout);
C - Make the Click handler and use this to set the font.
mySpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int myPosition, long myID) {
Log.i("renderSpinner -> ", "onItemSelected: " + myPosition + "/" + myID);
((TextView) parentView.getChildAt(0)).setTextColor(Color.GREEN);
((TextView) parentView.getChildAt(0)).setTextSize(TypedValue.COMPLEX_UNIT_PX, (int) (varScaleY * 22.0f) );
((TextView) parentView.getChildAt(0)).setPadding(1,1,1,1);
}
@Override
public void onNothingSelected(AdapterView<?> parentView) {
// your code here
}
});
}
D - Update the Spinner with new data:
private void updateInitSpinners(){
String mySelected = varSpinner.getSelectedItem().toString();
Log.i("TPRenderECommerce_Dialogue -> ", "updateInitSpinners -> mySelected: " + mySelected);
varSpinnerData.clear();
varSpinnerData.add("Hello World");
varSpinnerData.add("Hello World 2");
((BaseAdapter) varSpinner.getAdapter()).notifyDataSetChanged();
varSpinner.invalidate();
varSpinner.setSelection(1);
}
}
What I have not been able to solve in the updateInitSpinners, is to do varSpinner.setSelection(0); and have the custom font settings activated automatically.
UPDATE:
This "ugly" solution solves the varSpinner.setSelection(0); issue, but I am not very happy with it:
private void updateInitSpinners(){
String mySelected = varSpinner.getSelectedItem().toString();
Log.i("TPRenderECommerce_Dialogue -> ", "updateInitSpinners -> mySelected: " + mySelected);
varSpinnerData.clear();
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(varRoot, android.R.layout.simple_spinner_item, varSpinnerData);
spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
varSpinner.setAdapter(spinnerArrayAdapter);
varSpinnerData.add("Hello World");
varSpinnerData.add("Hello World 2");
((BaseAdapter) varSpinner.getAdapter()).notifyDataSetChanged();
varSpinner.invalidate();
varSpinner.setSelection(0);
}
}
Hope this helps......