我在发布问题之前搜索了很长时间......
我使用以下Android版本：
我在自定义Spinner下拉布局时遇到了一些问题
我在服务器上调用REST服务，它返回给我一个这个对象的列表：
我的微调器模型类
public class TipoAllarmeMercePericolosa implements Serializable {
private static final long serialVersionUID = 5833474803233889506L;
private String codiceAllarme;
private String descrizioneAllarme;
public TipoAllarmeMercePericolosa(String codiceAllarme, String descrizioneAllarme) {
this.codiceAllarme = codiceAllarme;
this.descrizioneAllarme = descrizioneAllarme;
}
public TipoAllarmeMercePericolosa() {
}
public String getCodiceAllarme() {
return codiceAllarme;
}
public void setCodiceAllarme(String codiceAllarme) {
this.codiceAllarme = codiceAllarme;
}
public String getDescrizioneAllarme() {
return descrizioneAllarme;
}
public void setDescrizioneAllarme(String descrizioneAllarme) {
this.descrizioneAllarme = descrizioneAllarme;
}
@Override
public String toString() {
return descrizioneAllarme;
}
}
我创建了自己的自定义适配器：
CustomAdapter
public class TipoAllarmeSpinnerAdapter extends ArrayAdapter<TipoAllarmeMercePericolosa> {
private final List<TipoAllarmeMercePericolosa> tipiAllarmi;
private final Context ctx;
public TipoAllarmeSpinnerAdapter(Context context, int resource, List<TipoAllarmeMercePericolosa> tipiAllarmi) {
super(context, resource);
this.tipiAllarmi = tipiAllarmi;
this.ctx = context;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//Restituiamo la view normale
return super.getView(position,convertView,parent);
}
@Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
return initView(position, convertView, parent);
}
private View initView(int position, View convertView, ViewGroup parent)
{
LayoutInflater inflater = (LayoutInflater) this.ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
TextView label = (TextView)inflater.inflate(R.layout.tipo_allarme_spinner_layout, parent, false);
TipoAllarmeMercePericolosa tamp = tipiAllarmi.get(position);
if( tamp != null )
{
label.setText(tamp.getDescrizioneAllarme());
}
else
{
label.setText(ctx.getString(R.string.selezione_tipo_allarme));
}
return label;
}
}
我定义了我的片段视图：
片段视图ricerca_allarmi_tab.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/ricercaAllarmiTabViewId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:text="@string/ricerca_tipo_allarmi"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Spinner
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tipo_allarme_spinner"
android:layout_alignParentTop="true"
android:layout_toEndOf="@+id/ricercaAllarmiTabViewId"
android:layout_toRightOf="@+id/ricercaAllarmiTabViewId" />
</RelativeLayout>
我定义了我的微调器行视图
微调器自定义行视图tipo_allarme_spinner_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<TextView
android:id="@+id/spinner_descrizione_tipo_allarme"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Elenco notifiche"
android:textAppearance="?android:attr/textAppearanceMedium"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>
在我的片段中，我执行以下操作：
public class RicercaAllarmiTab extends Fragment {
private static final String TAG_LOG = RicercaAllarmiTab.class.getSimpleName();
Spinner tipoAllarmiSpinner;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.ricerca_allarmi_tab, container, false);
tipoAllarmiSpinner = (Spinner)v.findViewById(R.id.tipo_allarme_spinner);
populateSpinner();
return v;
}
private void populateSpinner()
{
final Context ctx = this.getActivity();
final Spinner tipoAllSpin = this.tipoAllarmiSpinner;
MerciPericoloseRestClient.getTipiAllarme(MerciPericoloseRestClient.getTipoMerceAbsoluteUrl(), null, new TipiAllarmiHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Header[] headers, String rawJsonResponse, TipoAllarmeMerceAjaxResponse response) {
try {
List<TipoAllarmeMercePericolosa> tipiAllarmiJson = response.getPayload();
int dimensione = tipiAllarmiJson != null ? tipiAllarmiJson.size()+1:1;
final List<TipoAllarmeMercePericolosa> tipiAllarmi = new ArrayList<TipoAllarmeMercePericolosa>(dimensione);
tipiAllarmi.add(new TipoAllarmeMercePericolosa(IConstants.NO_SPINNER_SELECTION, ctx.getString(R.string.selezione_tipo_allarme)));
tipiAllarmi.addAll(tipiAllarmiJson);
//ArrayAdapter<TipoAllarmeMercePericolosa> spinnerAdapter = new ArrayAdapter<TipoAllarmeMercePericolosa>(ctx, android.R.layout.simple_dropdown_item_1line, tipiAllarmi);
TipoAllarmeSpinnerAdapter spinnerAdapter = new TipoAllarmeSpinnerAdapter(ctx, android.R.layout.simple_spinner_item, tipiAllarmi);
spinnerAdapter.setDropDownViewResource(R.layout.tipo_allarme_spinner_layout);
tipoAllSpin.setAdapter(spinnerAdapter);
tipoAllSpin.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
TipoAllarmeMercePericolosa tipo = tipiAllarmi.get(position);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
Log.i(TAG_LOG, "Nulla scelto");
}
});
}
catch (Exception e)
{
Log.e(TAG_LOG, "Errore nella costruzione dello spinner "+e.getMessage(), e);
(new AlertDialogBuilder(ctx)).buildDialog(ctx.getString(R.string.elenco_tipi_allarmi_dialog_title), getString(R.string.elenco_tipi_allarmi_dialog_message));
}
}
@Override
public void onFailure(int statusCode, Header[] headers, Throwable throwable, String rawJsonData, TipoAllarmeMerceAjaxResponse errorResponse) {
Log.e(TAG_LOG, "Errore nel caricamento dei tipi allarmi; " + throwable.getMessage(), throwable);
(new AlertDialogBuilder(ctx)).buildDialog(ctx.getString(R.string.elenco_tipi_allarmi_dialog_title), getString(R.string.elenco_tipi_allarmi_dialog_message));
}
});
}
}
ajax调用正常;事实上，如果我使用StringAdapter（populateSpinner方法中的注释行，我能够在spinner中显示我的元素的描述（因为我重写了类TipoAllarmeMercePericolosa的toString方法）
如果我使用上面代码中显示的自定义appender（未注释的appender），则永远不会填充微调器;我也不例外......只是我的锭床工人从未填充过
我真的无法理解为什么会这样......可能有人告诉我我失踪了什么吗？
谢谢你 安吉洛答案 0 :(得分：0)
我遇到了同样的问题，两天后我发现问题出在自定义微调器xml中使用RelativeLayout。
如果您执行以下操作
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<TextView
android:id="@+id/spinner_descrizione_tipo_allarme"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Elenco notifiche"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
它会正常工作