How to Programmatically Set the Selected Item in an Android Spinner by Value?

Setting Selected Item of Spinner by Value

When updating a view, you may encounter the need to preselect a value stored in the database for a Spinner. Initially, you might attempt a solution such as:

void setSpinner(String value)
{
    int pos = getSpinnerField().getAdapter().indexOf(value);
    getSpinnerField().setSelection(pos);
}

However, this approach encounters a roadblock as the Adapter interface does not provide an indexOf method.

Solution

To find and compare the position of a specific value within your Spinner, follow these steps:

1. Define a comparison value, for example: String compareValue = "some value".

2. Create an ArrayAdapter using the required resource:

   ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.select_state, android.R.layout.simple_spinner_item);

3. Set the ArrayAdapter as the Adapter for your Spinner:

   mSpinner.setAdapter(adapter);

4. Use the getPosition method to determine the position of your comparison value within the ArrayAdapter:

   if (compareValue != null) {
    int spinnerPosition = adapter.getPosition(compareValue);
    mSpinner.setSelection(spinnerPosition);
   }

   By following these steps, you can effectively preselect a value in a Spinner based on its value rather than its position in the list.

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