java - 第二个微调器不更新值

如果我更改或添加了第一个微调器的（spinnerBreeds）值-可以正常工作。但是Second spinner不会更新值。我尝试在notifyDataSetChanged()上调用adapter，但仍然无法正常工作。

我的代码是：

    public class MainActivity extends Activity {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            // Create DataHelper object and insert some sample data
            DataHelper datahelper = new DataHelper(this);
            datahelper.insertBreed ("Beagle");
            datahelper.insertBreed ("Bulldog");
            datahelper.insertBreed ("Chow Chow");

            // Get sample data from the database and display them in the spinner
            Spinner spinnerBreeds = (Spinner) findViewById(R.id.spinnerBreeds);
            ArrayList<String> list = datahelper.getAllBreeds();
            ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.spinner_layout, R.id.text, list);
            spinnerBreeds.setAdapter(adapter);



            //Init second spinner
            DataHelper2 datahelper2 = new DataHelper2(this);
            datahelper2.insertAge("1 year");
            datahelper2.insertAge ("2-3 years");
            datahelper2.insertAge("4-5 years");
            datahelper2.insertAge("6-9 years");
            datahelper2.insertAge("10+ years");


            // Get sample data from the database and display them in the spinner
            Spinner spinnerAge = (Spinner) findViewById(R.id.spinnerAge);
            ArrayList<String> list2 = datahelper2.getAllAge();
            ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(this, R.layout.spinner_layout, R.id.text, list2);
            spinnerAge.setAdapter(adapter2);






    }

最佳答案

Try this code........
spinnerBreeds.setOnItemSelectedListener(new OnItemSelectedListener() {

                    @Override
                    public void onItemSelected(AdapterView<?> parent, View view,
                            int position, long id) {
                        // TODO Auto-generated method stub

 ArrayList<String> list2 = datahelper2.getAllAge();
  ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_item, list2);

                spinnerAge.setAdapter(adapter2);
                    }

                    @Override
                    public void onNothingSelected(AdapterView<?> parent) {
                        // TODO Auto-generated method stub

                    }
                });