Android ListView NullPointerException when inflating View

Question

i have a ListView with a custom row: detail_row1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:orientation="horizontal" 
    android:layout_height="wrap_content"
    android:padding="6dip"
    **android:background="@drawable/item_background_selector"**  ---> line 7
    android:id="@+id/detail_linearLayout"
  >

<TextView 
    android:id="@+id/propName"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"   
    android:layout_weight="1"    
    android:textSize="16sp"
    android:textStyle="bold" 
    android:textColor="#000000"
    android:gravity="center_vertical|left"
    android:paddingTop="10sp"
    android:paddingBottom="10sp"
    android:paddingLeft="4sp"

/>

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="2"
    android:id="@+id/propValue"       
    android:textColor="#000000"
    android:textSize="16sp"
    android:textStyle="bold"
    android:paddingTop="10sp"
    android:paddingBottom="10sp"
    android:paddingRight="4sp"
    android:gravity="center_vertical|right"
    />  

</LinearLayout>

my /drawable/item_background_selector.xml (SAME if i put it under /color/item_background_selector.xml and properly reference it in detail_row1.xml)

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="false" android:color="#ACD52B">
    </item>
    <item android:state_selected="true" android:color="#0094CE">
    </item>
</selector>

when I try to inflate this view in my ListAdapter:

public View getView(int position, View convertView, ViewGroup parent) {
    View v=convertView;
    if(v==null) {
    LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v=vi.inflate(R.layout.detail_row1, null); **--> NullPointerException**
   }
    .
    .

It throws a NullPointerException.

This is not the case if i simply remove line 7 (android/background) from detail_row1.xml

Any clue / help on why this is happening (fairly new to android)

Thanks in advance!

(edit) Logcat:

**08-24 00:27:53.637: E/AndroidRuntime(15295): FATAL EXCEPTION: main**
08-24 00:27:53.637: E/AndroidRuntime(15295): android.view.InflateException: Binary XML file line #2: Error inflating class <unknown>
08-24 00:27:53.637: E/AndroidRuntime(15295):    at android.view.LayoutInflater.createView(LayoutInflater.java:613)
08-24 00:27:53.637: E/AndroidRuntime(15295):    at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
08-24 00:27:53.637: E/AndroidRuntime(15295):    at android.view.LayoutInflater.onCreateView(LayoutInflater.java:660)
08-24 00:27:53.637: E/AndroidRuntime(15295):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:685)
08-24 00:27:53.637: E/AndroidRuntime(15295):    at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
08-24 00:27:53.637: E/AndroidRuntime(15295):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
08-24 00:27:53.637: E/AndroidRuntime(15295):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
08-24 00:27:53.637: E/AndroidRuntime(15295):    at **com.dhomes.steel.DetailActivity$1.getView(DetailActivity.java:101)**

(2nd edit)

My listAdapter:

lvProperties.setAdapter(new ListAdapter() {
//Section section=new Section();

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View v=convertView;

   if(v==null) {
   //LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
   LayoutInflater vi =(LayoutInflater)DetailActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
   v=vi.inflate(R.layout.detail_row1, null);
   }

   TextView name=(TextView)v.findViewById(R.id.propName);
   TextView value=(TextView)v.findViewById(R.id.propValue);

   if(name!=null) {
       name.setText(section.propNames.get(position));
   }
   if(value!=null) {
       value.setText(section.propValues.get(position));
   }        
   return v;
}
.
.
.
}

Answer 1

My comment seems to be getting hidden. So posting as an answer.

The selector, unfortunately, cannot be used for colors. See this: Selector on background color of TextView

Answer 2

LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v=vi.inflate(R.layout.detail_row1, null);

From, above lines. You're inflating this in your customadapter class only it seems. So, you've the context object from Constructor so better use that like below -

...
LayoutInflater vi = (LayoutInflater)context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
v=vi.inflate(R.layout.detail_row1, null);
...

And, Don't remove the background from your xml file. Just try to clean your project and run after done this changes.

Answer 3

I am not sure but you can try this. Instead of calling inflater in getview call it in constructor of your adapter class as:

LayoutInflater vi =(LayoutInflater)DetailActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

and then call layout id in getView as:

if (convertView == null) {

            convertView = inflater.inflate(R.layout.cat_content, null);

            holder.name = (TextView) convertView.findViewById(R.id.name);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }