Question

I’m trying to set-up a basic structure for my project, which is supposed to run on API-levels 8 – 16, uses google location services and ActionBarSherlock.

See my other question for the setup.

I generated a simple activity with Eclipse (Master-Detail-Flow). My project currently has just one Activity and one Fragment. All I did so far is replacing the super classes with their ABS counterparts:

public class CouponListActivity extends SherlockFragmentActivity implements CouponListFragment.Callbacks {
...
}

and

public class CouponListFragment extends SherlockListFragment {
...
}

This is the one and only layout-element I’m using

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:name="....activity.CouponListFragment"
    android:id="@+id/coupon_list"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginLeft="16dp"
    android:layout_marginRight="16dp"
    tools:context=".CouponListActivity" />

This runs fine on an emulator on API 16, but fails on another emulator with API 8.

The problem is that I cannot interpret the stacktrace in any helpful way. My code does not the seem to get touched at all…

java.lang.NullPointerException
    at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:355)
    at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323)
    at android.widget.AbsListView.obtainView(AbsListView.java:1315)
    at android.widget.ListView.makeAndAddView(ListView.java:1727)
    at android.widget.ListView.fillDown(ListView.java:652)
    at android.widget.ListView.fillFromTop(ListView.java:709)
    at android.widget.ListView.layoutChildren(ListView.java:1580)
    at android.widget.AbsListView.onLayout(AbsListView.java:1147)
    at android.view.View.layout(View.java:7035)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
    at android.view.View.layout(View.java:7035)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
    at android.view.View.layout(View.java:7035)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
    at android.view.View.layout(View.java:7035)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
    at android.view.View.layout(View.java:7035)
    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
    at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
    at android.view.View.layout(View.java:7035)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
    at android.view.View.layout(View.java:7035)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
    at android.view.View.layout(View.java:7035)
    at android.view.ViewRoot.performTraversals(ViewRoot.java:1045)
    at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:123)
    at android.app.ActivityThread.main(ActivityThread.java:4627)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:521)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)

Where can I start looking for the problem? Let me know if I can provide more information.

Update: I have the exact same stacktrace if I rule out ABS and simply try to create a List-Activity / -Fragment combination that runs in API 8. Here is the project.

Answer 1

After reviewing your source code, you are using simple_list_item_activated_1 resource. Which was new to Android API level 11 So Solution for your problem is.

onCreate method should be something like this

@Override
 public void onCreate(final Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setListAdapter(new ArrayAdapter<DummyContent.DummyItem>(getActivity(), android.R.layout.simple_list_item_activated_1,android.R.id.text1, DummyContent.ITEMS));
 }

Since this was new to API Level 11, You will get same error with or without ActionBarSherlock. If you want to use simple_list_item_activated_1 then you need to create a local copy of it. Sorry for being late