当onItemSelected包含在片段中时,它不会被触发

时间:2013-09-29 07:07:32

标签: android android-spinner

===根本原因===

onItemSelected WORKS FINE,对于我在下面描述的问题,原因是我只是将一些代码分支到ArrayAdapter.notifyDataSetInvalidated()。给我的教训是:

* 当AdapterView上出现“无响应”时,请检查适配器。

感谢给我任何建议的朋友们。

===================

我想在一个片段中有一个微调器,但onItemSelected不起作用,请你告诉我原因,非常感谢。

这是活动布局xml:

<LinearLayout>
 <!-- onItemSelected works fine when the spinnerConnector defined in activity layout -->
 <Spinner
    android:id="@+id/spinnerConnectors"
    android:spinnerMode="dropdown" />
<!-- move spinnerConnectors into this fragment will cause the problem - onItemSelected not work
<fragment
    android:id="@+id/fragmentConnectors"
    android:name="com.sharework.transproxy.android.ConnectorsFragment"
    tools:layout="@layout/list_fragment1" />
-->
</LinearLayout>

ConnectorsFragment

public class ConnectorsFragment extends android.app.Fragment{
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
                // create adapter ...
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.connectors_fragment, null);
    Spinner spinnerConnectors = (Spinner) view
            .findViewById(R.id.spinnerConnectors);
    spinnerConnectors.setAdapter(adapter);
    return view;
}

@Override
public void onActivityCreated(Bundle bundle) {
    super.onActivityCreated(bundle);
    Spinner spinnerConnectors = (Spinner) getView().findViewById(
            R.id.spinnerConnectors);
            spinnerConnectors
            .setOnItemSelectedListener(new OnItemSelectedListener() {

                @Override
                public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        // **** code to handle onItemSelected but not trigged
}

                @Override
                public void onNothingSelected(AdapterView<?> arg0) {
                }
            });
}

}

ConnectorsFragment的布局

<LinearLayout>

<Spinner
    android:id="@+id/spinnerConnectors"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:spinnerMode="dropdown" />

</LinearLayout>

活动

public class FactoryMonitorActivity TransProxyActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_factory_monitor);
    // invoke ConnectorsFragment.start to query for connectors and fill into the adapter
      }
}

Coule有人帮忙,谢谢!

1 个答案:

答案 0 :(得分:0)

从Activity中删除与微调器相关的所有内容(可能您在测试期间错过了删除的内容),然后使spinnerConnectors成为片段的类变量。因此,您必须只查找一次视图(此操作会对性能产生影响),并且下次使用微调器时,您不必在方法中声明局部变量。