如何更改 Spinner 使用的字符串数组？

Question

我正在尝试更改我的两个 Spinner 的内容。所以我已经创建了我的 Spinners：

       Spinner spinner01 = (Spinner) findViewById(R.id.Spinner01);
    Spinner spinner02 = (Spinner) findViewById(R.id.Spinner02);
    ArrayAdapter<CharSequence> adapter1 = ArrayAdapter.createFromResource(
            this, R.array.MetricUnitsArray, android.R.layout.simple_spinner_item);
    ArrayAdapter<CharSequence> adapter2 = ArrayAdapter.createFromResource(
            this, R.array.MetricUnitsArray, android.R.layout.simple_spinner_item);


    adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    spinner01.setAdapter(adapter1);
    spinner02.setAdapter(adapter2);

    spinner01.setOnItemSelectedListener(new MyOnItemSelectedListener1());
    spinner02.setOnItemSelectedListener(new MyOnItemSelectedListener2());

现在，通过不同的方法，我希望能够执行以下操作：

    adapter1 = ArrayAdapter.createFromResource(
            this, R.array.ImperialUnitsArray, android.R.layout.simple_spinner_item);
    adapter2 = ArrayAdapter.createFromResource(
            this, R.array.ImperialUnitsArray, android.R.layout.simple_spinner_item);

是否有办法让适配器从不同的字符串数组中读取？或者我应该用新值替换字符串数组中的值？

Answer 1

为您希望分配给 spinner2 的每个阵列创建单独的适配器。
宣布它们为最终版本。
在设置 spinner1 ItemSelected Listener 之前放置适配器声明。
在 spinner1 ItemSelected 侦听器中，根据需要设置适当的适配器。

在下面的代码中我有两个旋转器。
spinner1 有 4 个包含传感器类型的条目，当选择其中一种传感器类型时，spinner2 将填充该传感器类型的各种模型。

public class MainActivity extends Activity {

void showToast(CharSequence msg) {
    Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

   final Spinner s1 = (Spinner) findViewById(R.id.spinner_sensor_type);
   final Spinner s2 = (Spinner) findViewById(R.id.spinner_sensor_model);
   final ArrayAdapter<CharSequence> sensor_adapter = ArrayAdapter.createFromResource(
            this, R.array.sensors,android.R.layout.simple_spinner_item);
    sensor_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    final ArrayAdapter<CharSequence> pa_adapter = ArrayAdapter.createFromResource(
            this, R.array.pa_models,android.R.layout.simple_spinner_item);
    final ArrayAdapter<CharSequence> ca_adapter = ArrayAdapter.createFromResource(
            this, R.array.ca_models,android.R.layout.simple_spinner_item);
    final ArrayAdapter<CharSequence> ni_adapter = ArrayAdapter.createFromResource(
            this, R.array.ni_models,android.R.layout.simple_spinner_item);
    final ArrayAdapter<CharSequence> ni_fe_adapter = ArrayAdapter.createFromResource(
            this, R.array.ni_fe_models,android.R.layout.simple_spinner_item);
    pa_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    ca_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    ni_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    ni_fe_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    s1.setAdapter(sensor_adapter); 
    s2.setAdapter(pa_adapter); // set default array values in spinner 2 
    s1.setOnItemSelectedListener(
            new OnItemSelectedListener() {
                public void onItemSelected(
                        AdapterView<?> parent, View view, int position, long id) {
                    showToast("Sensor Type: position=" + position + " id=" + id);
                    switch (position) {
                    case 0: 
                        s2.setAdapter(pa_adapter);                          
                            break;
                    case 1: 
                        s2.setAdapter(ca_adapter);
                            break;
                    case 2:
                        s2.setAdapter(ni_adapter);
                            break;
                    case 3:
                        s2.setAdapter(ni_fe_adapter);
                    default: // Do this...
                            break;
               }  

                }

                public void onNothingSelected(AdapterView<?> parent) {
                    showToast("Sensor Type: unselected");
                }
            });



    s2.setOnItemSelectedListener(
            new OnItemSelectedListener() {
                public void onItemSelected(
                        AdapterView<?> parent, View view, int position, long id) {
                    showToast("Sensor Model: position=" + position + " id=" + id);
                }

                public void onNothingSelected(AdapterView<?> parent) {
                    showToast("Sensor Model: unselected");
                }
            });
}

}

Answer 2

您可以使用 ArrayAdapter 的 getter /设置者：

例如：

adapter1.clear();
adapter1.addAll(theNewListOfValues);
adapter1.notifyDatasetChanged();

Answer 3

您应该能够使用新适配器在微调器上调用 setAdapter 。我建议您在创建适配器后将它们存储为活动中的字段，以便在需要再次在适配器之间交换时可以轻松地重复使用它们。