ActionBarSherlock: Error inflating class <unknown>

Question

I'm developing an app that uses ActionBarSherlock. The app works fine when run on SDK v15(ICS), but crashes with SDK v8 (Froyo)!

Here is the error I'm getting:

E/AndroidRuntime(  489): FATAL EXCEPTION: main
E/AndroidRuntime(  489): android.view.InflateException: Binary XML file line #10: Error inflating class <unknown>
E/AndroidRuntime(  489):    at android.view.LayoutInflater.createView(LayoutInflater.java:513)
E/AndroidRuntime(  489):    at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
E/AndroidRuntime(  489):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563)
E/AndroidRuntime(  489):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:618)
E/AndroidRuntime(  489):    at android.view.LayoutInflater.inflate(LayoutInflater.java:407)
E/AndroidRuntime(  489):    at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
E/AndroidRuntime(  489):    at com.finerrecliner.HeadlineAdapter.getView(HeadlineAdapter.java:44)
E/AndroidRuntime(  489):    at android.widget.AbsListView.obtainView(AbsListView.java:1315)
E/AndroidRuntime(  489):    at android.widget.ListView.makeAndAddView(ListView.java:1727)
E/AndroidRuntime(  489):    at android.widget.ListView.fillDown(ListView.java:652)
E/AndroidRuntime(  489):    at android.widget.ListView.fillFromTop(ListView.java:709)
E/AndroidRuntime(  489):    at android.widget.ListView.layoutChildren(ListView.java:1566)
E/AndroidRuntime(  489):    at android.widget.AbsListView.onLayout(AbsListView.java:1147)
E/AndroidRuntime(  489):    at android.view.View.layout(View.java:7035)
E/AndroidRuntime(  489):    at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
E/AndroidRuntime(  489):    at android.view.View.layout(View.java:7035)
E/AndroidRuntime(  489):    at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
E/AndroidRuntime(  489):    at android.view.View.layout(View.java:7035)
E/AndroidRuntime(  489):    at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1388)
E/AndroidRuntime(  489):    at android.view.View.layout(View.java:7035)
E/AndroidRuntime(  489):    at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
E/AndroidRuntime(  489):    at android.view.View.layout(View.java:7035)
E/AndroidRuntime(  489):    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
E/AndroidRuntime(  489):    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
E/AndroidRuntime(  489):    at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
E/AndroidRuntime(  489):    at android.view.View.layout(View.java:7035)
E/AndroidRuntime(  489):    at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
E/AndroidRuntime(  489):    at android.view.View.layout(View.java:7035)
E/AndroidRuntime(  489):    at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
E/AndroidRuntime(  489):    at android.view.View.layout(View.java:7035)
E/AndroidRuntime(  489):    at android.view.ViewRoot.performTraversals(ViewRoot.java:1045)
E/AndroidRuntime(  489):    at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
E/AndroidRuntime(  489):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(  489):    at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(  489):    at android.app.ActivityThread.main(ActivityThread.java:4627)
E/AndroidRuntime(  489):    at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(  489):    at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime(  489):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
E/AndroidRuntime(  489):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
E/AndroidRuntime(  489):    at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(  489): Caused by: java.lang.reflect.InvocationTargetException
E/AndroidRuntime(  489):    at android.widget.TextView.<init>(TextView.java:321)
E/AndroidRuntime(  489):    at java.lang.reflect.Constructor.constructNative(Native Method)
E/AndroidRuntime(  489):    at java.lang.reflect.Constructor.newInstance(Constructor.java:446)
E/AndroidRuntime(  489):    at android.view.LayoutInflater.createView(LayoutInflater.java:500)
E/AndroidRuntime(  489):    ... 39 more
E/AndroidRuntime(  489): Caused by: java.lang.UnsupportedOperationException: Can't convert to dimension: type=0x2
E/AndroidRuntime(  489):    at android.content.res.TypedArray.getDimensionPixelSize(TypedArray.java:463)
E/AndroidRuntime(  489):    at android.view.View.<init>(View.java:1891)
E/AndroidRuntime(  489):    at android.widget.TextView.<init>(TextView.java:327)
E/AndroidRuntime(  489):    ... 43 more

Here is the relevant XML in question (line 10 is when the first TextView is declared):

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


<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="10dp">
    <TextView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="16dp"
        android:textColor="#000000"
        android:gravity="center_vertical"
        android:paddingLeft="?android:attr/listPreferredItemPaddingLeft"
        android:paddingRight="?android:attr/listPreferredItemPaddingRight"
    />

    <TextView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/source_date"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="10dp"
        android:textColor="#666666"
        android:gravity="center_vertical"
        android:paddingLeft="?android:attr/listPreferredItemPaddingLeft"
        android:paddingRight="?android:attr/listPreferredItemPaddingRight"
    />
</LinearLayout>

And here is the relevant my HeadlineAdapter.java code (line 44 is noted with a comment):

class HeadlineAdapter extends ArrayAdapter<SyndEntryEnhanced> {
    private int mLayoutResourceID;
    private Context mContext;
    private class HeadlineHolder {
        TextView title;
        TextView source_date;
    }

    public HeadlineAdapter(Context context, int textViewResourceId, ArrayList<SyndEntryEnhanced> list) {
        super(context, textViewResourceId, list);
        this.mContext = context;
        this.mLayoutResourceID = textViewResourceId;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;
        HeadlineHolder holder = null;

        if (row == null) {
            LayoutInflater infl = (LayoutInflater)((SherlockFragmentActivity)mContext).getLayoutInflater();
            row = infl.inflate(mLayoutResourceID, parent, false);  // LINE 44

            holder = new HeadlineHolder();
            holder.title = (TextView)row.findViewById(R.id.title);
            holder.source_date = (TextView)row.findViewById(R.id.source_date);
            row.setTag(holder);
        } else {
            holder = (HeadlineHolder)row.getTag();
        }

        SyndEntry entry = super.getItem(position).getEntry();
        String title = super.getItem(position).getFeedTitle().trim();
        Date date = entry.getPublishedDate();
        SimpleDateFormat formatter = new SimpleDateFormat("MMM d", Locale.US);

        holder.title.setText(StringEscapeUtils.unescapeHtml(entry.getTitle()));
        if (date == null) {
            holder.source_date.setText(title);
        } else {
            holder.source_date.setText(title + " - " + formatter.format(date));
        }

        return row;
    }
}

Any ideas?

Answer 1

I figured it out. The attributes listPreferredItemPaddingLeft and listPreferredItemPaddingRight are only available in API v14 and later. Removing those padding attributes from my TextViews got rid of the error when running on older versions of Android.

source: http://developer.android.com/reference/android/R.attr.html#listPreferredItemPaddingLeft