I get this exception Attempt to invoke virtual method 'android.view.LayoutInflater android.app.Activity.getLayoutInflater()' on a null object reference but I am able to find the reason.
In the mainactivity I create a ListView element, the structure is:
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/list"
/>
And I create a custom Adapter class for the listview,
class ListItem
{
public String shortDescription;
public String type;
public String time;
public int imageId;
public ListItem(String sd, String type, String time, Integer imageId)
{
this.shortDescription = sd;
this.type = type;
this.time = time;
this.imageId = imageId;
}
}
public class CustomList extends ArrayAdapter<Object>{
private Activity context;
private ListItem listItem[];
public CustomList(Activity context, ListItem li[]){
super(context, R.layout.rowlayout, li);
this.listItem = li;
}
@Override
public View getView(int position, View view, ViewGroup parent)
{
LayoutInflater inflater = context.getLayoutInflater();
View rowView = inflater.inflate(R.layout.rowlayout, null, true);
TextView sd = (TextView)rowView.findViewById(R.id.sd);
TextView type = (TextView)rowView.findViewById(R.id.type);
TextView days = (TextView)rowView.findViewById(R.id.days);
ImageView icon = (ImageView)rowView.findViewById(R.id.icon);
sd.setText(listItem[position].shortDescription);
type.setText(listItem[position].type);
days.setText(listItem[position].time);
icon.setImageResource(listItem[position].imageId);
return rowView;
}
And I call this in my MainActivity class,
public class MainActivity extends ActionBarActivity {
ListView listView;
ListItem listItem[] = new ListItem[2];
Integer[] imageId = {R.drawable.ic_launcher};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listItem[0] = new ListItem("test", "test", "test", imageId[0]);
listItem[1] = new ListItem("test1", "test1", "test1", imageId[0]);
CustomList adapter = new CustomList(MainActivity.this, listItem);
listView = (ListView)findViewById(R.id.list);
listView.setAdapter(adapter);
}
}
I get the exception in the custom Adapter class , at LayoutInflater inflater = context.getLayoutInflater();. But the variable context is initialized in the constructor call itself. Why does it throw an Exception?
