Question

有两个微调器，比如spinner1和spinner2，它们都有两个字符串数组适配器作为它们的适配器。应用程序的业务逻辑是spinner2依赖于spinner1的选定值。那么如何从spinner1的选定项中过滤spinner2的数据？例如，适配器1具有strin-array：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="region"> // for the label displayed
        <item>Analamanga</item>
        <item>Itasy</item>
    </string-array>
    <string-array name="region_id"> // this is for the actual value of the selected label
        <item>1</item>
        <item>2</item>
    </string-array>
</resources>

适配器2有字符串数组：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="district"> // for the label displayed
        <item>Central</item>
        <item>Boeny</item>
    </string-array>
    <string-array name="district_id"> // this is for the actual value of the selected label
        <item>1</item>
        <item>2</item>
    </string-array>
</resources>

Answer 1

使用HashTable<Integer,ArrayList<String>>映射您的RegionSpinner和DistrictSpinner值。

此HashTable将RegionSpinner上所选项目的位置作为关键字，ArrayList<String>将DistrictSpinner适配器的位置作为值。

然后，当您在RegionSpinner上选择一个项目时，您会在FilterSpinnerAdapter上设置一个新的Adapter（ArrayAdapter扩展DistrictSpinner），所以它上面的值动态变化。

ArrayList<String>将根据您在HashTable上选择的位置返回RegionSpinner新适配器的public class SpinnerActivity extends Activity{ Spinner spinnerRegion, spinnerDistrict; int selectionCount=0; Hashtable<Integer,ArrayList<String>> spinnerValues; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.layout_buttons_activity); ArrayList<String> regions = new ArrayList<String>(); regions.add("Analamanga"); regions.add("Itasy"); regions.add("ThirdRegion"); ArrayList<String> analamangaDistricts = new ArrayList<String>(); analamangaDistricts.add("Boeny"); ArrayList<String> itasyDistricts = new ArrayList<String>(); itasyDistricts.add("Central"); ArrayList<String> thirdRegionDistricts = new ArrayList<String>(); thirdRegionDistricts.add("District1"); thirdRegionDistricts.add("District2"); thirdRegionDistricts.add("District3"); spinnerValues = new Hashtable<Integer, ArrayList<String>>(); spinnerValues.put(0, analamangaDistricts); spinnerValues.put(1, itasyDistricts); spinnerValues.put(2, thirdRegionDistricts); spinnerRegion = (Spinner) findViewById(R.id.spinner_region); if(spinnerRegion != null) { FilterSpinnerAdapter regionadapter = new FilterSpinnerAdapter(getApplicationContext(), R.layout.layout_spinner_item, regions); regionadapter.setDropDownViewResource(R.layout.layout_simple_spinner_dropdown_item); spinnerRegion.setAdapter(regionadapter); spinnerRegion.setOnItemSelectedListener(new OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> adapterView, View view, int position, long itemId) { FilterSpinnerAdapter newDistrictAdapter = new FilterSpinnerAdapter(getApplicationContext(), R.layout.layout_spinner_item, spinnerValues.get(position)); newDistrictAdapter.setDropDownViewResource(R.layout.layout_simple_spinner_dropdown_item); spinnerDistrict.setAdapter(newDistrictAdapter); } @Override public void onNothingSelected(AdapterView<?> arg0) { } }); } spinnerDistrict = (Spinner) findViewById(R.id.spinner_district); if(spinnerDistrict != null) { FilterSpinnerAdapter districtadapter = new FilterSpinnerAdapter(getApplicationContext(), R.layout.layout_spinner_item, analamangaDistricts); districtadapter.setDropDownViewResource(R.layout.layout_simple_spinner_dropdown_item); spinnerDistrict.setAdapter(districtadapter); spinnerDistrict.setOnItemSelectedListener(new OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> adapterView, View view, int position, long itemId) { //do whatever you want here } @Override public void onNothingSelected(AdapterView<?> arg0) { } }); } } public class FilterSpinnerAdapter extends ArrayAdapter<String> { public FilterSpinnerAdapter(Context context, int resource, ArrayList<String> ys) { super(context, resource, ys); } @Override public int getCount() { // - 1 so that the hint (last item) isn't shown return super.getCount(); } @Override public String getItem(int position) { return super.getItem(position); } @Override public long getItemId(int position) { return super.getItemId(position); } }。

以下是代码：

TextView

}

更新： R.layout.layout_spinner_item是微调器上每个drop_down项的布局。它包含一个简单的<?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/spinnerTitle" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="5dp" android:textStyle="bold" />。像这样：

{{1}}

我希望能帮到你。：d

如何过滤微调器的字符串数组适配器？

1 个答案: