Question
I have a fragment that after clicking an item in the listview, loads a new fragment. If I use the backbutton to go back to the first fragment I get a FC with this error:
https://stackoverflow.com/questions/22160766
italiano
english
français
española
中国
日本の
العربية
Deutsch
한국어
Português
Russian3-03 19:37:38.193 30258-30258/com.beerportfolio.beerportfoliopro E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.beerportfolio.beerportfoliopro.Portfolio$1.onItemSelected(Portfolio.java:93)
at android.widget.AdapterView.fireOnSelected(AdapterView.java:892)
at android.widget.AdapterView.selectionChanged(AdapterView.java:879)
at android.widget.AdapterView.checkSelectionChanged(AdapterView.java:1043)
at android.widget.AdapterView.handleDataChanged(AdapterView.java:1022)
at android.widget.AbsSpinner.onMeasure(AbsSpinner.java:180)
at android.widget.Spinner.onMeasure(Spinner.java:441)
at android.view.View.measure(View.java:16088)
at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1226)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:590)
at android.view.View.measure(View.java:16088)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5061)
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:16088)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5061)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:16088)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5061)
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:16088)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5061)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:16088)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5061)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:16088)
at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:651)
at android.view.View.measure(View.java:16088)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5061)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:16088)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5061)
at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:302)
at android.view.View.measure(View.java:16088)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5061)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2277)
at android.view.View.measure(View.java:16088)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2109)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1219)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1403)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1119)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5849)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:786)
at android.view.Choreographer.doCallbacks(Choreographer.java:586)
at android.view.Choreographer.doFrame(Choreographer.java:546)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:771)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:5789)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:843)
at dalvik.system.NativeStart.main(Native Method)
The code for this fragment is:
public class Portfolio extends Fragment implements PortfolioGetAllBeers.OnArticleSelectedListener {
String beerId = "";
String userName;
String userID;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//set layout here
final View theLayout = inflater.inflate(R.layout.activity_portfolio, container, false);
setHasOptionsMenu(true);
getActivity().setTitle("Portfolio");
//get user information
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
userName = prefs.getString("userName", null);
userID = prefs.getString("userID", null);
final Spinner portfolioType = (Spinner) theLayout.findViewById(R.id.portfolioSpinner);
portfolioType.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
String portfolioChoice = portfolioType.getSelectedItem().toString();
Log.d("portfolio", portfolioChoice);
PortfolioGetAllBeers.OnArticleSelectedListener thisOne;
thisOne = Portfolio.this;
if( portfolioChoice.equals("All")){
//todo: clear second spinner
LinearLayout ll = (LinearLayout) theLayout.findViewById(R.id.addSpinnerLayout);
ll.removeAllViews();
//get userID
//get user data
//construct url
String url = "myurl1";
//async task goes here
PortfolioGetAllBeers task = new PortfolioGetAllBeers(getActivity());
task.setOnArticleSelectedListener(Portfolio.this);
task.execute(url);
}
else if (portfolioChoice.equals("Brewery")){
LinearLayout ll = (LinearLayout) theLayout.findViewById(R.id.addSpinnerLayout);
ll.removeAllViews();
LayoutInflater inflater = (LayoutInflater)selectedItemView.getContext().getSystemService(selectedItemView.getContext().LAYOUT_INFLATER_SERVICE);
View v = inflater.inflate(R.layout.addspinner_layout, null); // inflate addspinner
Spinner sp = (Spinner) v.findViewById(R.id.portfolioSpinner2); //portfolioSpinner2
ll.addView(v); // add the view to the linear layout
//todo: get breweries and fill spinner
//get userID
//get user data
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(selectedItemView.getContext());
String userID = prefs.getString("userID", null);
//construct url
String url = "http://beerportfolio.com/app_getAllYourBreweries.php?u=" + userID;
//async task goes here
new PortfolioGetAllBreweries(selectedItemView.getContext(), thisOne).execute(url);
}
else if (portfolioChoice.equals("Style")){
LinearLayout ll = (LinearLayout) theLayout.findViewById(R.id.addSpinnerLayout);
ll.removeAllViews();
LayoutInflater inflater = (LayoutInflater)selectedItemView.getContext().getSystemService(selectedItemView.getContext().LAYOUT_INFLATER_SERVICE);
View v = inflater.inflate(R.layout.addspinner_layout, null); // inflate addspinner
Spinner sp = (Spinner) v.findViewById(R.id.portfolioSpinner2); //portfolioSpinner2
ll.addView(v); // add the view to the linear layout
//get userID
//get user data
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(selectedItemView.getContext());
String userID = prefs.getString("userID", null);
//construct url
String url = "myurl2";
//todo: async task goes here
new PortfolioGetAllStyles(selectedItemView.getContext(), thisOne).execute(url);
}
else if (portfolioChoice.equals("Rating")){
LinearLayout ll = (LinearLayout) theLayout.findViewById(R.id.addSpinnerLayout);
ll.removeAllViews();
LayoutInflater inflater = (LayoutInflater)selectedItemView.getContext().getSystemService(selectedItemView.getContext().LAYOUT_INFLATER_SERVICE);
View v = inflater.inflate(R.layout.addspinner_layout, null); // inflate addspinner
Spinner sp = (Spinner) v.findViewById(R.id.portfolioSpinner2); //portfolioSpinner2
ll.addView(v); // add the view to the linear layout
//get userID
//get user data
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(selectedItemView.getContext());
String userID = prefs.getString("userID", null);
//make array
//make array list for beer
final List<String> tasteList = new ArrayList<String>();
tasteList.add("1");
tasteList.add("2");
tasteList.add("3");
tasteList.add("4");
tasteList.add("5");
// Selection of the spinner
Spinner spinner = (Spinner) theLayout.findViewById(R.id.portfolioSpinner2);
// Application of the Array to the Spinner
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(selectedItemView.getContext(), android.R.layout.simple_spinner_item,tasteList );
spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); // The drop down view
spinner.setAdapter(spinnerArrayAdapter);
//todo: add on select for spinner 2
//add on item selected
final Spinner portfolioType = (Spinner) theLayout.findViewById(R.id.portfolioSpinner2);
portfolioType.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
String portfolioChoice = portfolioType.getSelectedItem().toString();
//Toast.makeText(((Activity) c).getApplicationContext(), portfolioChoice, Toast.LENGTH_LONG).show();
final ListView lv = (ListView) theLayout.findViewById(R.id.allYourBeersList);
lv.setAdapter(null);
//get brewery beers
//get userID
//get user data
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(selectedItemView.getContext());
String userID = prefs.getString("userID", null);
try {
portfolioChoice = URLEncoder.encode(portfolioChoice, "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
//construct url
String url = "myurl3";
Log.d("portfolio" , url);
//async task goes here
PortfolioGetAllBeers task = new PortfolioGetAllBeers(getActivity());
task.setOnArticleSelectedListener(Portfolio.this);
task.execute(url);
}
@Override
public void onNothingSelected(AdapterView<?> parentView) {
// do nothing
}
});
}
}
@Override
public void onNothingSelected(AdapterView<?> parentView) {
// do nothing
}
});
// Inflate the layout for this fragment
return theLayout;
}
@Override
public void onArticleSelected(String bID, String brewery){
//code to execute on click
Fragment Fragment_one;
FragmentManager man= getFragmentManager();
FragmentTransaction tran = man.beginTransaction();
Fragment_one = new BeerPage();
final Bundle bundle = new Bundle();
bundle.putString("beerIDSent", bID);
bundle.putString("breweryIDSent", brewery);
Fragment_one.setArguments(bundle);
tran.replace(R.id.main, Fragment_one);//tran.
tran.addToBackStack(null);
tran.commit();
}
}
Line 92 that the error refers to is:
LayoutInflater inflater = (LayoutInflater)selectedItemView.getContext().getSystemService(selectedItemView.getContext().LAYOUT_INFLATER_SERVICE);
No correct solution
OTHER TIPS
Do not refer to context this way.
Use:
Context ctx = getActivity();
And then use ctx where you use selectedItemView.getContext()
Instead of geting LayoutInflater from system service, try:
LayoutInflater inflater = LayoutInflater.from(ctx);
See if this helps :)
