Ndtyjky

When I try to populate my listview with my custom adapter or object of my custom class, the application jumps back to the previous activity.

I tried to debug, but I can't find the row that causes this behavior.

Maybe there's something with the layout that at the moment to to be inflated and drawn encounters some problem.

ACTIVITY CODE

try {

        JSONObject obj = new JSONObject(response);



        String objservice = obj.getString("service");

        String objstatuCode = obj.getString("status-code");

        String objdescription = obj.getString("status-description");



        JSONObject result = obj.getJSONObject("result");





        JSONArray cronologie = result.getJSONArray("dettaglioAttivita");





        inputItems = new ArrayList<DTOLibrettoCronologia>();





        for (int i = 0; i < cronologie.length(); i++) {





            JSONObject row = cronologie.getJSONObject(i);





           DTOLibrettoCronologia tmp = new DTOLibrettoCronologia("s", "s", "s", "s", "s", "s", "s");

            inputItems.add(tmp);



        }





    } catch (Exception e) {

        e.printStackTrace();

        Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show();

    }



    librettoCronologiaAdapter adapter = new librettoCronologiaAdapter(getApplicationContext(),

            R.layout.libretto_cronologia, inputItems);





    listView = (ListView) findViewById(R.id.cronologia_listview);

    listView.setAdapter(adapter);

    listView.setSmoothScrollbarEnabled(true);

XML ELEMENT CODE

<?xml version="1.0" encoding="utf-8"?>



<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:id = "@+id/libretto_cronologia_element"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:layout_marginTop="0dp"

    android:background="@color/transparent">

    <!-- primary wrapper -->

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal"

        android:background="@color/transparent">



        <!--image -->

        <LinearLayout

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:orientation="vertical"

            android:background="@color/transparent"

            android:layout_marginTop="5dp"

            android:layout_marginLeft="16dp">

            <ImageView

                android:id="@+id/cronologiaState"

                android:layout_width="36dp"

                android:layout_height="40dp"

                android:src="@drawable/check_cronologia_fail"/>

        </LinearLayout>



        <!--text -->

        <LinearLayout

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:orientation="vertical"

            android:background="@color/transparent"

            android:paddingLeft="8dp"

            android:paddingTop="8dp">

            <LinearLayout

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:orientation="horizontal"

                android:layout_marginLeft="4dp">

                <TextView

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="Data Appello: "/>

                <TextView

                    android:id="@+id/cronologiaDataAppello"

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="content"/>

            </LinearLayout>





            <LinearLayout

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:orientation="horizontal"

                android:layout_marginLeft="4dp">

                <TextView

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="tipo: "/>

                <TextView

                    android:id="@+id/cronologiaTipo"

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="content"/>

            </LinearLayout>



            <LinearLayout

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:orientation="horizontal"

                android:layout_marginLeft="4dp">

                <TextView

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="Voto/Giudizio: "/>

                <TextView

                    android:id="@+id/cronologiaVoto"

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="content"/>

                </LinearLayout>



            <LinearLayout

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:orientation="horizontal"

                android:layout_marginLeft="4dp">

                <TextView

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="Stato: "/>

                <TextView

                    android:id="@+id/cronologiaStato"

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="content"/>

            </LinearLayout>



            <LinearLayout

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:orientation="horizontal"

                android:layout_marginLeft="4dp">

                <TextView

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="Data Verb: "/>

                <TextView

                    android:id="@+id/cronologiaVerb"

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="content"/>

            </LinearLayout>



            <LinearLayout

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:orientation="horizontal"

                android:layout_marginLeft="4dp">

                <TextView

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="Superato: "/>

                <TextView

                    android:id="@+id/cronologiaSuperato"

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="content"/>

            </LinearLayout>



        </LinearLayout>







    </LinearLayout>

</RelativeLayout>

XMLACTIVITY CODE

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@+id/cronologia_materia"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:layout_gravity="center_horizontal|bottom">

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:orientation="vertical">





        <!-- TOP BAR -->

        <LinearLayout

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:orientation="vertical"

            android:background="@color/colorPrimary"

            android:padding="20dp">

            <TextView

                android:layout_width="match_parent"

                android:layout_height="wrap_content"

                android:text="cronologia esami per"

                android:textSize="13dp"/>

            <TextView

                android:id="@+id/nomeMateria"

                android:layout_width="match_parent"

                android:layout_height="wrap_content"

                android:text="-"

                android:textSize="18dp"/>

        </LinearLayout>







        <!-- general info -->

        <LinearLayout

            android:id="@+id/recapWrapper"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:background="@color/transparent"

            android:orientation="vertical"

            android:padding="20dp">







            <LinearLayout

                android:layout_width="match_parent"

                android:layout_height="wrap_content"

                android:orientation="horizontal">

                <TextView

                    android:id="@+id/annoCorso"

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="Anno di Corso:"

                    android:paddingRight="10dp"/>

                <TextView

                    android:id="@+id/annoCorsoValue"

                    android:layout_width="match_parent"

                    android:layout_height="wrap_content"

                    android:text="-" />

            </LinearLayout>





            <LinearLayout

                android:layout_width="match_parent"

                android:layout_height="wrap_content"

                android:orientation="horizontal">

                <TextView

                    android:id="@+id/tipologia"

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="Tipologia d'esame:"

                    android:paddingRight="10dp"/>

                <TextView

                    android:id="@+id/tipologiaValue"

                    android:layout_width="match_parent"

                    android:layout_height="wrap_content"

                    android:text="-" />

            </LinearLayout>





            <LinearLayout

                android:layout_width="match_parent"

                android:layout_height="wrap_content"

                android:orientation="horizontal">

                <TextView

                    android:id="@+id/corso"

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="Corso di Studio:"

                    android:paddingRight="10dp"/>

                <TextView

                    android:id="@+id/corsoValue"

                    android:layout_width="match_parent"

                    android:layout_height="wrap_content"

                    android:text="-" />

            </LinearLayout>





            <LinearLayout

                android:layout_width="match_parent"

                android:layout_height="wrap_content"

                android:orientation="horizontal">

                <TextView

                    android:id="@+id/dataSperamento"

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="Data di Superamento:"

                    android:paddingRight="10dp"/>

                <TextView

                    android:id="@+id/dataSperamentoValue"

                    android:layout_width="match_parent"

                    android:layout_height="wrap_content"

                    android:text="-" />

            </LinearLayout>





            <LinearLayout

                android:layout_width="match_parent"

                android:layout_height="wrap_content"

                android:orientation="horizontal">

                <TextView

                    android:id="@+id/votoFinale"

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="Voto Finale"

                    android:paddingRight="10dp"/>

                <TextView

                    android:id="@+id/votoFinaleValue"

                    android:layout_width="match_parent"

                    android:layout_height="wrap_content"

                    android:text="-" />

            </LinearLayout>





            <LinearLayout

                android:layout_width="match_parent"

                android:layout_height="wrap_content"

                android:orientation="horizontal">

                <TextView

                    android:id="@+id/peso"

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="Peso:"

                    android:paddingRight="10dp"/>

                <TextView

                    android:id="@+id/pesoValue"

                    android:layout_width="match_parent"

                    android:layout_height="wrap_content"

                    android:text="-" />

            </LinearLayout>





            <LinearLayout

                android:layout_width="match_parent"

                android:layout_height="wrap_content"

                android:orientation="horizontal">

                <TextView

                    android:id="@+id/Valutazione"

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:text="Valutazione:"

                    android:paddingRight="10dp"/>

                <TextView

                    android:id="@+id/ValutazioneValue"

                    android:layout_width="match_parent"

                    android:layout_height="wrap_content"

                    android:text="-" />

            </LinearLayout>





        </LinearLayout>







        <!-- LISTVIEW -->

        <LinearLayout

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:orientation="vertical"

            android:background="@color/transparent"

            android:padding="20dp">



            <ListView

                android:id="@+id/cronologia_listview"

                android:layout_width="match_parent"

                android:layout_height="match_parent">

            </ListView>





        </LinearLayout>











    </LinearLayout>

</FrameLayout>

CUSTOM ADAPTER CODE

public class librettoCronologiaAdapter extends ArrayAdapter<DTOLibrettoCronologia> {



    Context context;

    int rand = 0;



    public librettoCronologiaAdapter(Context context, int risorsaId,

                                     List<DTOLibrettoCronologia> items) {

        super(context, risorsaId, items);

        this.context = context;

    }





    //metodo getView --> ritorna la view da inserire nella ListView



    public View getView(int position, View convertView, ViewGroup parent) {



        //controllo se c'è gia un layout

        LayoutInflater mInflater = (LayoutInflater) context

                .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);



        DTOLibrettoCronologia content = getItem(position);



        Toast.makeText(getContext(), "adapter", Toast.LENGTH_SHORT).show();









        return convertView;

    }

LOGCAT

FATAL EXCEPTION: main

                                                                    Process: design.ubris.myuni, PID: 14189

                                                                    java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getImportantForAccessibility()' on a null object reference

                                                                        at android.widget.AbsListView.obtainView(AbsListView.java:2436)

                                                                        at android.widget.ListView.makeAndAddView(ListView.java:1986)

                                                                        at android.widget.ListView.fillDown(ListView.java:709)

                                                                        at android.widget.ListView.fillFromTop(ListView.java:770)

                                                                        at android.widget.ListView.layoutChildren(ListView.java:1749)

                                                                        at android.widget.AbsListView.onLayout(AbsListView.java:2210)

                                                                        at android.view.View.layout(View.java:17702)

                                                                        at android.view.ViewGroup.layout(ViewGroup.java:5631)

                                                                        at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079)

                                                                        at android.view.View.layout(View.java:17702)

                                                                        at android.view.ViewGroup.layout(ViewGroup.java:5631)

                                                                        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1762)

                                                                        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1606)

                                                                        at android.widget.LinearLayout.onLayout(LinearLayout.java:1515)

                                                                        at android.view.View.layout(View.java:17702)

                                                                        at android.view.ViewGroup.layout(ViewGroup.java:5631)

                                                                        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:325)

                                                                        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)

                                                                        at android.view.View.layout(View.java:17702)

                                                                        at android.view.ViewGroup.layout(ViewGroup.java:5631)

                                                                        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:325)

                                                                        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)

                                                                        at android.view.View.layout(View.java:17702)

                                                                        at android.view.ViewGroup.layout(ViewGroup.java:5631)

                                                                        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1762)

                                                                        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1606)

                                                                        at android.widget.LinearLayout.onLayout(LinearLayout.java:1515)

                                                                        at android.view.View.layout(View.java:17702)

                                                                        at android.view.ViewGroup.layout(ViewGroup.java:5631)

                                                                        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:325)

                                                                        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)

                                                                        at android.view.View.layout(View.java:17702)

                                                                        at android.view.ViewGroup.layout(ViewGroup.java:5631)

                                                                        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1762)

                                                                        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1606)

                                                                        at android.widget.LinearLayout.onLayout(LinearLayout.java:1515)

                                                                        at android.view.View.layout(View.java:17702)

                                                                        at android.view.ViewGroup.layout(ViewGroup.java:5631)

                                                                        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:325)

                                                                        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)

                                                                        at com.android.internal.policy.DecorView.onLayout(DecorView.java:774)

                                                                        at android.view.View.layout(View.java:17702)

                                                                        at android.view.ViewGroup.layout(ViewGroup.java:5631)

                                                                        at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2519)

                                                                        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2234)

                                                                        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1372)

                                                                        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6774)

                                                                        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:926)

                                                                        at android.view.Choreographer.doCallbacks(Choreographer.java:735)

                                                                        at android.view.Choreographer.doFrame(Choreographer.java:667)

                                                                        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:912)

                                                                        at android.os.Handler.handleCallback(Handler.java:761)

                                                                        at android.os.Handler.dispatchMessage(Handler.java:98)

                                                                        at android.os.Looper.loop(Looper.java:156)

                                                                        at android.app.ActivityThread.main(ActivityThread.java:6523)

                                                                        at java.lang.reflect.Method.invoke(Native Method)

                                                                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942)

                                                                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832)

simply adding this to the adapter getView method:

    if (convertView == null) {

        convertView = mInflater.inflate(R.layout.libretto_cronologia, null);

    }

:D :D