How to create GridView image gallery programmatically in android?

Question

I want to create 3x3 gridview programmatically for displaying images. And I want to set each item height and width by getting screen dimensions. Like:

Displa         


        

Answer 1

In your Activity:

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
GridView gridView = new GridView(this);
gridView.setNumColumns(3);
setContentView(gridView);
gridView.setAdapter(new GridViewAdapter(this));
}

And Adapter:

private class GridViewAdapter extends BaseAdapter {
private Context context;
private final int length = 9;
public GridViewAdapter(Context context) {
            this.context = context;
}
@Override
        public int getCount() {
            return length;
        }
@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) {
                imageView = new ImageView(context);
                DisplayMetrics metrics = context.getResources().getDisplayMetrics();
                int width = metrics.widthPixels / 3;
                int height = metrics.heightPixels / 3;
                imageView.setLayoutParams(new GridView.LayoutParams(width, height));
            } else {
                imageView = (ImageView) convertView;
            }
imageView.setImageResource(R.drawable.ic_launcher);
            return imageView;
        }
    }