Affect Second Spinner Choices based on First Spinner

问题

So I can see that there are questions about this, but not in the scope of mine. I am buliding an app for Android that has two spinners. The first has an array of choices. However, I am not sure how to affect what choices the second one has based on the first one. I know that you can put in

AdapterView.OnItemSelectedListener

but I'm not sure how to implement this. I've read on this but it's not quite what I'm looking for. I'm also curious as to how I tell the spinner which array to choose, is it in the .xml or in the .java file?

回答1:

Try this,

firstSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1,
                    int arg2, long arg3) {
                // TODO Auto-generated method stub

                    string selectedValue = arg0.getSelectedItem().toString();
                    if(selectedValue.equalsIgnoreCase(string1)
                    {
                        ArrayAdapter<String> firstAdapter = new ArrayAdapter<String>(this,
                            android.R.layout.simple_list_item_1, firstArray);

                        secondSpinner.setAdapter(firstAdapter);//
                    }

                   else if(selectedValue.equalsIgnoreCase(string2)
                   {
                      ArrayAdapter<String> firstAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, array2);

                      secondSpinner.setAdapter(firstAdapter);

                   }
            }

Hope it will help you.

回答2:

If it's a String array you could define it in XML then use getResource().getStringArray() or declare it in Java.

In your listener for the first spinner, you could do the following to set the choices for the second spinner.

secondSpinnerAdapter = new ArrayAdapter<CharSequence>(this, android.R.layout.simple_spinner_item, newArray);
secondSpinner.setAdapter(secondSpinnerAdapter);

Tested and working

回答3:

update the array list of second spinner in 1st spinner setOnItemSelectedListener

spinner1.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1,
                    int arg2, long arg3) {
                // TODO Auto-generated method stub


                    string str=spinner1.getSelectedItem().toString();
                    if(str.equals("spinner item"))//spinner item is selected item of spinner1
                    {
                        ArrayAdapter<String>adapter1 = new ArrayAdapter<String>(this,
                            android.R.layout.simple_list_item_1, array1);
                 //adapter1.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
                 spinner2.setAdapter(adapter1);//
                    }else if{
                   ArrayAdapter<String>adapter1 = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, array2);
                    //adapter1.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
                 spinner2.setAdapter(adapter2);

        }
            }

来源：https://stackoverflow.com/questions/18648489/affect-second-spinner-choices-based-on-first-spinner

标签

java

android

android-spinner