给GridView添加一个固定的尾部按钮,以及监听点击事件:(类似于微信群聊邀请好友按钮)
如下图效果:
想实现这个效果的话非常简单(关于GridView的基本用法我就不多说了)
粘贴关键代码:
@Override
public int getCount() {
return friendsBeans.size() + 1;
}
只需要在GridView的适配器的getCount()方法中的返回值+1,这样就会多制造一个View(就是size加1个View)。
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if (null == convertView) {
viewHolder = new ViewHolder();
convertView = LayoutInflater.from(context).inflate(R.layout.item_group_data, null);
viewHolder.ivPhoto = (ImageView) convertView.findViewById(R.id.iv1);
viewHolder.tvName = (TextView) convertView.findViewById(R.id.tv_name);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
if (position < friendsBeans.size()) {
FriendsBean friendsBean = (FriendsBean) getItem(position);
viewHolder.tvName.setText(friendsBean.getName());
Glide.with(context).load(friendsBean.getPhoto()).into(viewHolder.ivPhoto);
} else {
viewHolder.ivPhoto.setImageBitmap(BitmapFactory.decodeResource(context.getResources(), R.drawable.add_btn));
viewHolder.tvName.setVisibility(View.GONE);
}
return convertView;
}
static class ViewHolder {
ImageView ivPhoto;
TextView tvName;
}
主要看这个部分:
if (position < friendsBeans.size()) {
FriendsBean friendsBean = (FriendsBean) getItem(position);
viewHolder.tvName.setText(friendsBean.getName());
Glide.with(context).load(friendsBean.getPhoto()).into(viewHolder.ivPhoto);
} else {
viewHolder.ivPhoto.setImageBitmap(BitmapFactory.decodeResource(context.getResources(), R.drawable.add_btn));
viewHolder.tvName.setVisibility(View.GONE);
}
这里在GridView的适配器的getView()方法中判断当前在给第几个View赋值如果是集合size范围之内的就按照正常的方法赋值,是size之外的也就是我们刚才加1的View的话就给ImageView设置特殊的图片(也就是➕号图片)。
下面是加号的点击事件监听:
给GridView设置监听器我就不写了,主要逻辑在这段代码中:
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (parent.getChildCount() - 1 == position) {
//点击了加号
Toast.makeText(this, "邀请好友", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, position + "", Toast.LENGTH_SHORT).show();
}
}
这里判断点击的子View是否为最后一个,然后把需要的逻辑方法写在里面就OK了。
下面是全部代码:
实体类:
public class FriendsBean {
private String photo;
private String name;
private boolean check;
public FriendsBean() {
}
public FriendsBean(String photo, String name, boolean check) {
this.photo = photo;
this.name = name;
this.check = check;
}
public String getPhoto() {
return photo;
}
public void setPhoto(String photo) {
this.photo = photo;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public boolean getCheck() {
return check;
}
public void setCheck(boolean check) {
this.check = check;
}
}
Activity类:
public class GroupDataActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
private MyGridView gridView;
private GroupDataAdapter groupDataAdapter;
private GroupDataPresenter groupDataPresenter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_group_data);
initView();
initData();
setListeners();
}
private void setListeners() {
gridView.setOnItemClickListener(this);
}
private void initData() {
List<FriendsBean> fbs = new ArrayList<>();
fbs.add(new FriendsBean("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1502876543133&di=ed2dbfd1848aaeed780366dc0544224d&imgtype=0&src=http%3A%2F%2Fwww.jintang.cn%2Fdata%2Fattachment%2Fportal%2F201412%2F13%2F100108x6jj2s802h8j3cob.jpg", "小松", false));
fbs.add(new FriendsBean("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1502876763302&di=e1cde7fea3dba1c35fde549918b84886&imgtype=0&src=http%3A%2F%2Fhiphotos.baidu.com%2Fdoc%2Fpic%2Fitem%2F7acb0a46f21fbe09f67d698062600c338744ad07.jpg", "小井", false));
fbs.add(new FriendsBean("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1502876791845&di=af6700b8381f5e696348f3da37109397&imgtype=0&src=http%3A%2F%2Fpic23.nipic.com%2F20120914%2F10910345_100020812000_2.jpg", "高小松", false));
fbs.add(new FriendsBean("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1502876791845&di=217c1bfedac7191511cefb44242b10fa&imgtype=0&src=http%3A%2F%2Fpic24.nipic.com%2F20120921%2F10910345_130417417000_2.jpg", "欧阳峰", false));
fbs.add(new FriendsBean("https://gss3.bdstatic.com/7Po3dSag_xI4khGkpoWK1HF6hhy/baike/c0%3Dbaike80%2C5%2C5%2C80%2C26/sign=cfab9c942c9759ee5e5d6899d3922873/5d6034a85edf8db10c4284fd0323dd54564e743f.jpg", "东方不败", false));
fbs.add(new FriendsBean("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1502876894676&di=fdc9301ca95f5d03b579b4b402892e0f&imgtype=0&src=http%3A%2F%2Fwww.qxjlm.com%2Ftupians%2Fbd12876292.jpg", "黄老邪", false));
fbs.add(new FriendsBean("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1502876908257&di=61c2bbc1adecc3dd594c47e586fc599b&imgtype=jpg&src=http%3A%2F%2Fimg4.imgtn.bdimg.com%2Fit%2Fu%3D2580324790%2C489579783%26fm%3D214%26gp%3D0.jpg", "松", false));
fbs.add(new FriendsBean("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1502876894668&di=f017e4596cda6278fe7eb5380720f94f&imgtype=0&src=http%3A%2F%2Fimg.faxingw.cn%2F201509%2F51m_13.jpg", "我去", false));
fbs.add(new FriendsBean("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1502876894723&di=0af8c5e2728936e89d9ef72f5746eb55&imgtype=0&src=http%3A%2F%2Fimg003.21cnimg.com%2Fphotos%2Falbum%2F20140114%2Fm320%2FE94AA721DE7DBF46E23E92EF0592849E.jpeg", "来来来来", false));
fbs.add(new FriendsBean("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1502876894714&di=ec94f48b042accc87997d1c223d01604&imgtype=0&src=http%3A%2F%2Fscimg.jb51.net%2Fallimg%2F151202%2F14-1512021A520Z2.jpg", "阿斯达撒上的", false));
fbs.add(new FriendsBean("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1502876894710&di=e4a616663913bad5fd8fecf969254ace&imgtype=0&src=http%3A%2F%2Fimg3.duitang.com%2Fuploads%2Fitem%2F201509%2F14%2F20150914191741_rJXCw.thumb.700_0.png", "多少啊", false));
groupDataAdapter = new GroupDataAdapter(this, fbs);
gridView.setAdapter(groupDataAdapter);
}
private void initView() {
gridView = (MyGridView) findViewById(R.id.gridview);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (parent.getChildCount() - 1 == position) {
//点击了加号
Toast.makeText(this, "邀请好友", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, position + "", Toast.LENGTH_SHORT).show();
}
}
}
Adapter类:
public class GroupDataAdapter extends BaseAdapter {
private Context context;
private List<FriendsBean> friendsBeans;
public GroupDataAdapter(Context context, List<FriendsBean> friendsBeans) {
this.context = context;
this.friendsBeans = friendsBeans;
}
@Override
public int getCount() {
return friendsBeans.size() + 1;
}
@Override
public Object getItem(int position) {
return friendsBeans.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if (null == convertView) {
viewHolder = new ViewHolder();
convertView = LayoutInflater.from(context).inflate(R.layout.item_group_data, null);
viewHolder.ivPhoto = (ImageView) convertView.findViewById(R.id.iv1);
viewHolder.tvName = (TextView) convertView.findViewById(R.id.tv_name);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
if (position < friendsBeans.size()) {
FriendsBean friendsBean = (FriendsBean) getItem(position);
viewHolder.tvName.setText(friendsBean.getName());
Glide.with(context).load(friendsBean.getPhoto()).into(viewHolder.ivPhoto);
} else {
viewHolder.ivPhoto.setImageBitmap(BitmapFactory.decodeResource(context.getResources(), R.drawable.add_btn));
viewHolder.tvName.setVisibility(View.GONE);
}
return convertView;
}
static class ViewHolder {
ImageView ivPhoto;
TextView tvName;
}
以上就是全部代码,(如有遗漏或错误请留言讨论)。