Question

Exception, nothing beyond this. Normally logcat has more useful information, but in this case, sadly not much.

07-06 13:26:26.654: E/AndroidRuntime(726): java.lang.NullPointerException
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:355)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.widget.AbsSpinner.onMeasure(AbsSpinner.java:192)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.view.View.measure(View.java:8313)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:386)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.view.View.measure(View.java:8313)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.widget.ScrollView.measureChildWithMargins(ScrollView.java:1074)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.widget.ScrollView.onMeasure(ScrollView.java:296)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.view.View.measure(View.java:8313)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.view.View.measure(View.java:8313)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:531)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.view.View.measure(View.java:8313)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.view.View.measure(View.java:8313)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.view.ViewRoot.performTraversals(ViewRoot.java:839)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1859)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.os.Handler.dispatchMessage(Handler.java:99)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.os.Looper.loop(Looper.java:130)
07-06 13:26:26.654: E/AndroidRuntime(726):  at android.app.ActivityThread.main(ActivityThread.java:3683)
07-06 13:26:26.654: E/AndroidRuntime(726):  at java.lang.reflect.Method.invokeNative(Native Method)
07-06 13:26:26.654: E/AndroidRuntime(726):  at java.lang.reflect.Method.invoke(Method.java:507)
07-06 13:26:26.654: E/AndroidRuntime(726):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
07-06 13:26:26.654: E/AndroidRuntime(726):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
07-06 13:26:26.654: E/AndroidRuntime(726):  at dalvik.system.NativeStart.main(Native Method)

The start of my layout xml is (I suspect something silly missed out in the first half of xml) journey.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:baselineAligned="false"
        android:orientation="horizontal"
        android:weightSum="2" >

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:gravity="center"
            android:orientation="vertical" >
            //Skipped some code I think wont help debug this
            <Spinner
                android:id="@+id/startInMinutes"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

The first activity, calls this activity. The first few lines of the activity below.

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.journey);
    // Some more code
    // Adapter related code for ListView
    vehicleListView = (Spinner) findViewById(R.id.vehicleList);
    vehicleListView.setAdapter(new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_item, vehicleList));
    vehicleListView.setOnItemSelectedListener(this);
    vehicleListView.setSelection(0);

Edit : Root cause was, vehicleList array had null values.

Answer 1

That NullPointerException appears most likely because you have null values in the array/List that you pass in the ArrayAdapter‘s constructor for one of your Spinners.

By default an ArrayAdapter will call the method toString on the data items and use that to set the text on the row’s TextView if the type of data for the ArrayAdapter is not of type CharSequence.

Print the values of your data arrays(vehicleList and Globals.TIME_WINDOW) and make sure you don’t have null values in them.