Android:在自定义列表视图中单击获取按钮

我已经使用LazyAdapter创建了一个自定义列表视图。现在我需要使用一个可以点击拨打电话的图像。图像的onclick方法中出现了错误。StartActivity表示“LazyAdapter中没有这样的方法”。我在下面张贴代码。

public class LazyAdapter extends BaseAdapter {

private Activity activity;
private String[] data;
private String[] project;

Context con;

public LazyAdapter(Context con) {
    this.con = con;
}


public LazyAdapter(Activity a, String[] pic, String[] p) {
    activity = a;
    data = pic;
    project = p;
    inflater = (LayoutInflater) activity
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    imageLoader = new ImageLoader(activity.getApplicationContext());
}

public int getCount() {
    return data.length;
}

public Object getItem(int position) {
    return position;
}

public long getItemId(int position) {
    return position;
}

public View getView(final int position, View convertView, ViewGroup parent) {

    LayoutInflater inflater = (LayoutInflater) con
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View vi = convertView;

    if (convertView == null)
        vi = inflater.inflate(R.layout.item_result_page, null);



    ------more code----
    ImageView ivCall = (ImageView) vi.findViewById(R.id.imageViewIRCall);
    ivCall.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            String uri = "tel:9818222333";
             Intent intent = new Intent(Intent.ACTION_DIAL);
             intent.setData(Uri.parse(uri));
             startActivity(intent);
        }
    });

    return vi;
}

我已经引用了此链接,但startActivity中存在错误。 SO link