Getting null pointer exception on clicking spinner - nullpointerexception

Question

I am trying to display language and context in two different spinners. Here is the code
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
context = getContext();
rootView = inflater.inflate(R.layout.language_fragment, container,false);
dbRepo = DBRepo.getInstance(context);
getDialog().setTitle(Html.fromHtml("<font size='10' color='#9B9B9B'>Configuration Settings</font>"));
//language spinner
Spinner languageSpinner = (Spinner)rootView.findViewById(R.id.language_spinner);
List<String>languagelist;
languagelist = dbRepo.getLanguages(HomeFragment.projectGUID);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, languagelist);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
languageSpinner.setAdapter(adapter);
//context spinner
Spinner contextSpinner = (Spinner)rootView.findViewById(R.id.context_spinner);
List<String>contextlist;
contextlist = dbRepo.getContext(HomeFragment.projectGUID);
ArrayAdapter<String> adapterC = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, contextlist);
adapterC.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
contextSpinner.setAdapter(adapterC);
firstTym = true;
contextSpinner.setOnItemSelectedListener(new MyOnItemSelectedListener());
languageSpinner.setOnItemSelectedListener(new MyOnItemSelectedListener());
return rootView;
}
public class MyOnItemSelectedListener implements OnItemSelectedListener {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
String selectedItem = parent.getItemAtPosition(pos).toString();
if(firstTym)
{
//do nothing
}
else {
//check which spinner triggered the listener
switch (parent.getId()) {
//language spinner
case R.id.language_spinner:
Toast.makeText(parent.getContext(), "Language you selected is " + selectedItem, Toast.LENGTH_LONG).show();
dbRepo.updateDetails(selectedItem,null);
break;
//context spinner
case R.id.context_spinner:
Toast.makeText(parent.getContext(), "Context you selected is " + selectedItem, Toast.LENGTH_LONG).show();
dbRepo.updateDetails(null,selectedItem);
break;
}
}
firstTym = false;
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
}
This is the code where I have two spinners , context spinner works fine but when I click on language spinner, It's throwing null pointer exception
here is my xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<RelativeLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:padding="30dp"
android:layout_margin="10dp">
<TextView
android:layout_width="wrap_content"
android:layout_weight="0.5"
android:layout_height="wrap_content"
android:text="Select Language"
android:id="#+id/lang_txt"
android:gravity="center"
android:textSize="#dimen/abc_text_size_medium_material"
android:layout_margin="20dp"
android:layout_alignParentStart="true"/>
<Spinner
android:id="#+id/language_spinner"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginLeft="5dp"
android:layout_marginRight="20dp"
android:layout_marginTop="5dp"
android:layout_marginBottom="20dp"
android:layout_toRightOf="#+id/lang_txt"
/>
</RelativeLayout>
<RelativeLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:padding="30dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginBottom="10dp"
>
<TextView
android:layout_width="wrap_content"
android:layout_weight="0.5"
android:layout_height="wrap_content"
android:text="Select Context"
android:id="#+id/con_txt"
android:layout_alignParentStart="true"
android:gravity="center"
android:textSize="#dimen/abc_text_size_medium_material"
android:layout_margin="20dp" />
<Spinner
android:id="#+id/context_spinner"
android:layout_width="0dp"
android:layout_weight="0.5"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_marginTop="5dp"
android:layout_marginRight="20dp"
android:layout_marginBottom="20dp"
android:layout_marginLeft="5dp"
android:layout_toRightOf="#+id/con_txt"
android:layout_alignParentRight="true"
/>
</RelativeLayout>
</LinearLayout>
Can anyone suggest anything, what's wrong with the language spinner?
Here is the stack trace
12-18 10:58:09.084 22744-22744/com.example.mediaapp.prototypingcanvas E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.mediaapp.prototypingcanvas, PID: 22744
java.lang.NullPointerException
at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:394)
at android.widget.ArrayAdapter.getDropDownView(ArrayAdapter.java:415)
at android.support.v7.widget.AppCompatSpinner$DropDownAdapter.getDropDownView(AppCompatSpinner.java:624)
at android.support.v7.widget.AppCompatSpinner$DropDownAdapter.getView(AppCompatSpinner.java:620)
at android.support.v7.widget.AppCompatSpinner.compatMeasureContentWidth(AppCompatSpinner.java:547)
at android.support.v7.widget.AppCompatSpinner.access$500(AppCompatSpinner.java:65)
at android.support.v7.widget.AppCompatSpinner$DropdownPopup.computeContentWidth(AppCompatSpinner.java:738)
at android.support.v7.widget.AppCompatSpinner$DropdownPopup.show(AppCompatSpinner.java:763)
at android.support.v7.widget.AppCompatSpinner.performClick(AppCompatSpinner.java:424)
at android.view.View$PerformClick.run(View.java:18675)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5590)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
at dalvik.system.NativeStart.main(Native Method)

Answer 1

Solved it!!
Actually a String value in my List LanguageList was null and that was throwing the exception