在 Android 上将 ParseData 结果列出到 simpleListView [英] List ParseData results to simpleListView on Android
本文介绍了在 Android 上将 ParseData 结果列出到 simpleListView的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想将我的 ArrayList 项目列出到简单列表视图中.我试图将 ArrayList(iller) 转换为 StringArray(mListe) 但我不能.它总是给我 NullPointerException.我的错误是什么，我该如何解决这个问题谢谢你的帮助.
I want to list my ArrayList items to the simple list view. I tried to convert ArrayList(iller) to StringArray(mListe) but I couldn't. It gives me always NullPointerException. What is my mistakes and how can I solve this problem Thank you for any help.
这是我的列表片段；
public class ListeFragment extends ListFragment {
public View mView;
public String[] mListe;
public ListView listView;
public ArrayList<String> iller = new ArrayList<String>();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
mView = inflater.inflate(R.layout.fragment_liste, container, false);
return mView;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
getOnlineDataFromParse();
}
private void setIlcelerArray(){
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getListView().getContext(), R.layout.ilce_view, mListe);
setListAdapter(adapter);
listView = (ListView) mView.findViewById(android.R.id.list);
listView.setAdapter(adapter);
}
@Override
public void onResume() {
super.onResume();
googleAnalyticsSendScreen();
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(getActivity(), ListVets.class);
intent.putExtra("position", position);
intent.putExtra("ilce", mListe[position]);
startActivity(intent);
//GOOGLE ANALYTICS EVENT SENDER
String secilenilce = "Seçilen ilçe " + mListe[position];
Tracker t = ((GlobalState) getActivity().getApplication()).getTracker(
GlobalState.TrackerName.APP_TRACKER);
t.send(new HitBuilders.EventBuilder()
.setCategory("İlçeler Listesi")
.setAction("Seçilen ilçe")
.setLabel(secilenilce)
.build());
}
});
}
private void getOnlineDataFromParse(){
ParseQuery<ParseObject> query = ParseQuery.getQuery("Veterinerler");
query.setLimit(1000);
query.findInBackground(new FindCallback<ParseObject>() {
public void done(List<ParseObject> vetList, ParseException e) {
if (e == null) {
for(int i=0; i< vetList.size(); i++){
iller.add(vetList.get(i).getString("il"));
}
mListe = iller.toArray(new String[iller.size()]);
setIlcelerArray();
} else {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle(getString(R.string.parse_online_query_error_title));
builder.setMessage(getString(R.string.parse_online_query_error_message));
builder.setPositiveButton(android.R.string.ok, null);
AlertDialog dialog = builder.create();
dialog.show();
}
}
});
}
有 logCat ;
E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.esmobileinc.vetmapp.u.k(Unknown Source)
at android.support.v4.app.Fragment.C(Unknown Source)
at android.support.v4.app.v.a(Unknown Source)
at android.support.v4.app.v.a(Unknown Source)
at android.support.v4.app.v.d(Unknown Source)
at android.support.v4.app.v.e(Unknown Source)
at android.support.v4.app.v.b(Unknown Source)
at android.support.v4.app.aa.b(Unknown Source)
at android.support.v4.view.ViewPager.a(Unknown Source)
at android.support.v4.view.ViewPager.c(Unknown Source)
at android.support.v4.view.ViewPager.onMeasure(Unknown Source)
at android.view.View.measure(View.java:15518)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:15518)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure(Unknown Source)
at android.view.View.measure(View.java:15518)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:15518)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:15518)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
at android.view.View.measure(View.java:15518)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
at android.view.Choreographer.doCallbacks(Choreographer.java:562)
at android.view.Choreographer.doFrame(Choreographer.java:532)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
谢谢！
推荐答案
ParseQueryAdapter<ParseObject> mainAdapter;
^ParseQueryAdapter 是我们用来将 ParseObject(s) 加载到 ListView 中的.声明 ParseQueryAdapter 后，您需要创建 ParseQueryAdapter.QueryFactory 并将其应用于您的适配器.
^ParseQueryAdapter is what we use to load ParseObject(s) into a ListView. After declaring a ParseQueryAdapter you will want to make a ParseQueryAdapter.QueryFactory and apply it to your adapter.
ParseQueryAdapter.QueryFactory<ParseObject> factory;
factory = new ParseQueryAdapter.QueryFactory<ParseObject>() {
@Override
public ParseQuery<ParseObject> create() {
ParseQuery query = new ParseQuery("ParseObject");
return query;
}
};
mainAdapter = new ParseQueryAdapter<ParseObject>(this, factory) {
@Override
public View getItemView(final ParseObject object, View v, ViewGroup parent) {
if (v == null) {
v = View.inflate(getContext(), R.layout.your_list_view, null);
}
return v;
}
};
mainAdapter.setPaginationEnabled(true);
mainAdapter.setTextKey("title");
mainAdapter.setImageKey("Image");
mainAdapter.loadObjects();
如果你想做更多这样的事情，你可能会取得一些成功.如果您查看 getItemView() 方法，您可以看到我引用 xml listview 文件的位置.
If you want to do something more like this you may get some success. If you look at the getItemView() method you can see where I reference the xml listview file.
这篇关于在 Android 上将 ParseData 结果列出到 simpleListView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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