Accessing XML Image Array within an ImageAdapter - arrays

Question

My question is very similar to this thread, however it was never properly answered.
I have an ImageAdapter setup as so;
public class ImageAdapter extends BaseAdapter {
private Context mContext;
int[] mImages;
public ImageAdapter(Context c, int[] images) {
mContext = c;
mImages = images;
}
#Override
public int getCount() {
return 0;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) {
// if it's not recycled, initialize some attributes
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(200, 200));
} else {
imageView = (ImageView) convertView;
}
imageView.setImageResource(mImages[position]);
return imageView;
}
}
And I want the images to be from an XML;
<integer-array name="images">
<item>#drawable/image1</item>
<item>#drawable/image2</item>
<item>#drawable/image3</item>
</integer-array>
In my MainActivity class I have tried to get the image array and pass it into the ImageAdapter but I can't;
public class MainActivity extends AppCompatActivity {
private int images[] = getResources().getIntArray(R.array.images);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
GridView gridview = (GridView) findViewById(R.id.gridView);
gridview.setAdapter(new ImageAdapter(MainActivity.this, images));
}
}
I am currently getting an error message:
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
with my app crashing on load up. I want to make my ImageAdapter display images from an XML in my GridView.

Answer 1

try to use
private int images[] = {R.drawable.image1, R.drawable.image3, R.drawable.image3};
instead of
private int images[] = getResources().getIntArray(R.array.images);