[英]2 Refreshing Issues within a ListFragment
我的ListFragment有两个问题:单击XML文件中定义的按钮后,我想刷新ListFragment。最初将DataAdapter的数据加载到TitlesFragment中的AsyncTask中。
我还没有找到一种方法来创建可以访问AsyncTask的按钮的代码-并刷新我的TitlesFragment
另外一点:每次我更改手机的方向时,Listfragment都会自动更新,这绝对不是所需的行为。
public class ClosestPlaces extends FragmentActivity {
private static KantinenListe kantinen;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_ACTION_BAR);
setContentView(R.layout.kantinen_results);
}
/**
* This is the "top-level" fragment, showing a list of items that the
* user can pick. Upon picking an item, it takes care of displaying the
* data to the user as appropriate based on the currrent UI layout.
*/
public static class TitlesFragment extends ListFragment {
boolean mDualPane;
int mCurCheckPosition = 0;
private class BuildKantinen extends AsyncTask<String, Integer, KantinenListe> {
private KantinenListe kantinen;
@Override
protected KantinenListe doInBackground(String... params) {
try{
Gson gson = new Gson();
// SOAP Test
String NAMESPACE = "http://tempuri.org/";
String METHOD_NAME = "fullSyncGPS";
String SOAP_ACTION = "http://tempuri.org/IDatenService/fullSyncGPS";
String URL = "http://webserviceURL?wsdl";
SoapObject request = new SoapObject(NAMESPACE,METHOD_NAME);
PropertyInfo pi = new PropertyInfo();
request.addProperty("radius",10);
request.addProperty("lat", "14.089201");
request.addProperty("lng", "02.136459");
request.addProperty("von", "01.09.2011");
request.addProperty("bis", "01.09.2011");
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet = true;
envelope.setOutputSoapObject(request);
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
androidHttpTransport.call(SOAP_ACTION, envelope);
SoapPrimitive result = (SoapPrimitive)envelope.getResponse();
String resultData = result.toString();
resultData = "{\"meineKantinen\":"+resultData+"}";
this.kantinen = gson.fromJson(resultData, KantinenListe.class);
Log.i("test", "blubber" );
}
catch(Exception e)
{
e.printStackTrace();
}
return this.kantinen;
}
@Override
protected void onPostExecute(KantinenListe result) {
// populate the List with the data
Log.i("test", "postexecute" );
setListAdapter( new MenuAdapter(getActivity(), R.layout.simple_list_item_checkable_1, kantinen.getMeineKantinen()));
}
}
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
new BuildKantinen().execute("test");
if (savedInstanceState != null) {
// Restore last state for checked position.
mCurCheckPosition = savedInstanceState.getInt("curChoice", 0);
}
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("curChoice", mCurCheckPosition);
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
showDetails(position);
}
/**
* Helper function to show the details of a selected item, either by
* displaying a fragment in-place in the current UI, or starting a
* whole new activity in which it is displayed.
*/
void showDetails(int index) {
mCurCheckPosition = index;
// Otherwise we need to launch a new activity to display
// the dialog fragment with selected text.
Log.i("Test",Integer.toString(index));
Intent intent = new Intent();
intent.setClass(getActivity(), BeAPartner.class);
startActivity(intent);
}
}
public static class MenuAdapter extends ArrayAdapter {
private LayoutInflater mInflater;
private List<Kantine> items;
private Context context;
public MenuAdapter(Context context, int textViewResourceId, List<Kantine> items) {
super(context, textViewResourceId);
mInflater = LayoutInflater.from(context);
this.items = items;
this.context = context;
}
@Override
public int getCount() {
return items.size();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.menu_row, parent, false);
holder = new ViewHolder();
holder.color = (TextView) convertView.findViewById(R.id.color);
holder.title = (TextView) convertView.findViewById(R.id.detail);
holder.subdetail = (TextView) convertView.findViewById(R.id.subdetail);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
// Fill in the actual story info
Kantine s = items.get(position);
s.setName( Html.fromHtml(s.getName()).toString() );
if (s.getName().length() > 35)
holder.title.setText(s.getName().substring(0, 32) + "...");
else
holder.title.setText(s.getName());
Log.i("display", "Here I am");
return convertView;
}
}
static class ViewHolder {
TextView color;
TextView title;
TextView subdetail;
}
要阻止该活动重新启动,您只需在运行该片段的活动上设置android:configChanges属性即可。
android:configChanges="orientation"
告诉系统不要在方向更改时重新启动活动的设置,仅用于更改方向。
至于按钮,请使用android:onClick =“ myFunction”属性以XML设置点击侦听器。 然后在您的片段中定义此函数:
public void myFunction(View v)
{
new myAsync.execute('test');
}
更改电话方向时,它将重新启动活动。 您需要永久保存的所有内容都需要保存在onSaveInstanceState(Bundle savedInstanceState)中,并使用onRestoreInstanceState(Bundle savedInstanceState)进行还原。
至于单击按钮时更新数据,请尝试在适配器上调用notifyDataSetChanged()。 如果这不起作用,您可能只需要再次运行asynctask。
好的,我认为最好的做法是在新答案中发布可能的解决方案-出于明显的可读性原因:
public void reload(View v)
{
if (getSupportFragmentManager().findFragmentById(R.id.titles) != null) {
Fragment titles = (ListFragment)getSupportFragmentManager().findFragmentById(R.id.titles);
//recreate the fragment
titles.onActivityCreated(null);
}
}
正是我想要的(重新加载数据)! 但是...我认为此解决方案的内存占用可能不好。
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