Exception thrown during TypedArray#getTextArray()

Question

This is my first time creating a custom view and I'm trying to populate it with entries via XML -- in a manner similar to a Spinner. I'm obviously doing something wrong here, but I've styled my approach after the Spinner, so I fail to see what has gone wrong.

To explain the intent of this code, I'm creating a custom preference list. MultiChooserOption is an item that allows a user to select multiple things from a list of options. TextOption simply defines the view that will be displayed in the list, i.e.- ther e is a caption and some other element, for subclasses of TextOption the other element will be text as opposed to a widget (checkbox, etc.).

Below is the source for everything that should have any impact on the way I've built this as well as my logcat output.

attrs.xml

<resources>

    <attr name="caption" format="string" />
    <attr name="options" format="reference" />

    <declare-styleable name="TextOption">
        <attr name="caption" />
        <attr name="text" format="string" />
    </declare-styleable>
    <declare-styleable name="MultiChooserOption">
        <attr name="options" />
    </declare-styleable>

</resources>

MultiChooserOption.java

public class MultiChooserOption extends TextOption<CharSequence> {

    public static final String TAG = MultiChooserOption.class.getSimpleName();

    private List<CharSequence> options;
    private MultiChoiceListView<CharSequence> choiceView;

    public MultiChooserOption(Context context) {

        super( context );
    }

    public MultiChooserOption(Context context, AttributeSet attrs) {

        super( context, attrs );
        initOptions( attrs );
    }

    private void initOptions( AttributeSet attrs ) {

        TypedArray attributesArray = getContext().obtainStyledAttributes( attrs, R.styleable.TextOption, 0, 0 );

        try {
            // this line is where things go wrong
            CharSequence[] optionsArray = attributesArray.getTextArray( R.styleable.MultiChooserOption_options );
            setOptions( Arrays.asList( optionsArray ) );
        }
        catch (NotFoundException e) {
            Log.e( TAG, e.getMessage(), e );
        }
        finally {
            attributesArray.recycle();
        }
    }
}

TextOption.java

public abstract class TextOption<T> extends LinearLayout {

    public static final String TAG = TextOption.class.getSimpleName();

    private TextView captionTextView;
    private TextView valueTextView;

    private String caption;
    private String value;

    public TextOption(Context context) {

        super( context );
        init();
    }

    public TextOption(Context context, AttributeSet attrs) {

        super( context, attrs );

        TypedArray attributesArray = context.obtainStyledAttributes( attrs, R.styleable.TextOption, 0, 0 );
        try {
            setCaption( attributesArray.getString( R.styleable.TextOption_caption ) );
            setValue( attributesArray.getString( R.styleable.TextOption_text ) );
        }
        finally {
            attributesArray.recycle();
        }

        init();
    }
}

options_fragment.xml

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:custom="http://schemas.android.com/apk/res/com.mypackage"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/white" >

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

        <com.mypackage.view.MultiChooserOption
            android:id="@+id/multichooser"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            custom:caption="@string/multichooser_caption"
            custom:options="@array/multichooser_options" />

    </LinearLayout>

</ScrollView>

arrays.xml

<resources>

    <string-array name="multichooser_options">
        <item>@string/option1</item>
        <item>@string/option2</item>
        <item>@string/option3</item>
        <item>@string/option4</item>
        <item>@string/option5</item>
        <item>@string/option6</item>
    </string-array>

</resources>

strings.xml

<resources>
    <string name="multichooser_caption">MultiChooser</string>
    <string name="option1">option 1</string>
    <string name="option2">option 2</string>
    <string name="option3">option 3</string>
    <string name="option4">option 4</string>
    <string name="option5">option 5</string>
    <string name="option6">option 6</string>
</resources>

OptionsFragment.java

public class OptionsFragment extends RoboSherlockFragment {

    public static final String TAG = OptionsFragment.class.getSimpleName();

    @Override
    public View onCreateView( LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState ) {

        View view = inflater.inflate( R.layout.options_fragment, container, false );
        return view;
    }
}

logcat output

09-18 20:52:36.940: E/AndroidRuntime(4237): FATAL EXCEPTION: main
09-18 20:52:36.940: E/AndroidRuntime(4237): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mypackage/com.mypackage.ui.OptionsActivity}: android.view.InflateException: Binary XML file line #44: Error inflating class com.mypackage.view.MultiChooserOption
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.os.Handler.dispatchMessage(Handler.java:99)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.os.Looper.loop(Looper.java:137)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.app.ActivityThread.main(ActivityThread.java:5041)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at java.lang.reflect.Method.invokeNative(Native Method)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at java.lang.reflect.Method.invoke(Method.java:511)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at dalvik.system.NativeStart.main(Native Method)
09-18 20:52:36.940: E/AndroidRuntime(4237): Caused by: android.view.InflateException: Binary XML file line #44: Error inflating class com.mypackage.view.MultiChooserOption
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.view.LayoutInflater.createView(LayoutInflater.java:613)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:687)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:749)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at com.mypackage.ui.OptionsFragment.onCreateView(OptionsFragment.java:27)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:551)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at com.github.rtyley.android.sherlock.roboguice.activity.RoboSherlockFragmentActivity.onStart(RoboSherlockFragmentActivity.java:46)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1164)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.app.Activity.performStart(Activity.java:5114)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2153)
09-18 20:52:36.940: E/AndroidRuntime(4237):     ... 11 more
09-18 20:52:36.940: E/AndroidRuntime(4237): Caused by: java.lang.reflect.InvocationTargetException
09-18 20:52:36.940: E/AndroidRuntime(4237):     at java.lang.reflect.Constructor.constructNative(Native Method)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.view.LayoutInflater.createView(LayoutInflater.java:587)
09-18 20:52:36.940: E/AndroidRuntime(4237):     ... 27 more
09-18 20:52:36.940: E/AndroidRuntime(4237): Caused by: java.lang.NullPointerException
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.content.res.AssetManager.getResourceTextArray(AssetManager.java:214)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.content.res.Resources.getTextArray(Resources.java:427)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at android.content.res.TypedArray.getTextArray(TypedArray.java:628)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at com.mypackage.view.MultiChooserOption.initOptions(MultiChooserOption.java:42)
09-18 20:52:36.940: E/AndroidRuntime(4237):     at com.mypackage.view.MultiChooserOption.<init>(MultiChooserOption.java:32)
09-18 20:52:36.940: E/AndroidRuntime(4237):     ... 30 more

So, when the line CharSequence[] optionsArray = attributesArray.getTextArray( R.styleable.MultiChooserOption_options ); in MultiChooserOption executes, an exception is thrown and the whole shebang come crumbling down. As far as I know, I'm following Spinner as much as should matter.

Please help me learn what I've done wrong here.

Answer 1

Well, now I feel silly.

When extending a parent view, it is not a good idea to obtain styled attributes for the parent.

TypedArray attributesArray = getContext().obtainStyledAttributes( attrs, R.styleable.TextOption, 0, 0 );

should be

TypedArray attributesArray = getContext().obtainStyledAttributes( attrs, R.styleable.MultiChooserOption, 0, 0 );