首先来看一下效果图；
先说一下我的需求：查看群成员，如果超过15人则全部显示，如果大于15人则先加载15人，其余的不显示，点击查看更多则加载全部。再来说一下我实现的逻辑：首先呢要判断群成员的人数，如果小于或者等于15就用GridView加载全部数据，隐藏查看更多的按钮。如果大于15人，则显示加载更多的按钮，先加载15条数据，其余的不加载，点击按钮之后获取全部数据放到自己写好的adapter里然后加载刷新，再隐藏加载更多的按钮。
好了，来看代码：
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="@color/white"
android:orientation="vertical">
<GridView
android:id="@+id/grid_member"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_margin="15dp"
android:layout_weight="1"
android:horizontalSpacing="15dp"
android:numColumns="5"
android:verticalSpacing="15dp"></GridView>
<LinearLayout
android:id="@+id/llayout_look_more"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/btn_white_selector"
android:gravity="center">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:drawableRight="@mipmap/arrow_down_qun"
android:gravity="center"
android:paddingBottom="30dp"
android:paddingTop="15dp"
android:text="查看更多群成员 "
android:textSize="@dimen/small_middle_text_size" />
</LinearLayout>
</LinearLayout>
然后是activity中部分判断的核心代码：
首先第一次判断和加载
if (mListData.size() > 15) {
mGroupManageAdapter.setNumber(false);
mLlayoutLookMore.setVisibility(View.VISIBLE);
} else {
mGroupManageAdapter.setNumber(true);
mLlayoutLookMore.setVisibility(View.GONE);
}
mGroupManageAdapter.replace(mListData);
点击按钮之后的代码：
mGroupManageAdapter.setNumber(true); mLlayoutLookMore.setVisibility(View.GONE); mGroupManageAdapter.replace(mListData);
再贴上我的adapter部分代码：
public class GroupManageAdapter extends BaseAdapter {
private Context mContext;
private List<PublicEntity> mList = new ArrayList<>();
private boolean mListType = true;//是否显示全部成员,默认显示
public void setNumber(boolean mListType) {
this.mListType = mListType;
}
public GroupManageAdapter(Context mContext) {
this.mContext = mContext;
}
public void replace(List<PublicEntity> itemDataTypes) {
mList.clear();
if (itemDataTypes.size() > 0) {
mList.addAll(itemDataTypes);
notifyDataSetChanged();
}
}
@Override
public int getCount() {
return mListType ? mList.size() : 15;
}
@Override
public Object getItem(int position) {
return mList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
convertView = View.inflate(mContext, R.layout.item_group_manage_head, null);
holder = new ViewHolder(convertView);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
String mPic = mList.get(position).getTextOne();
if (mPic != null && mPic.length() > 0) {
Picasso.with(mContext).load(mPic)
.placeholder(R.mipmap.s_hearder_user_nor)
.error(R.mipmap.s_hearder_user_nor)
.transform(new CircleTransform()).into(holder.mImgHead);
} else {
holder.mImgHead.setImageResource(R.mipmap.s_hearder_user_nor);
}
//这里是删除成员的标记，不管。
if (mList.get(position).ismIsShowDeleteIcon()) {
holder.mImgIconDelete.setVisibility(View.VISIBLE);
} else {
holder.mImgIconDelete.setVisibility(View.GONE);
}
holder.mTvName.setText(mList.get(position).getText());
return convertView;
}
static class ViewHolder {
@BindView(R.id.img_head)
ImageView mImgHead;
@BindView(R.id.img_icon_delete)
ImageView mImgIconDelete;
@BindView(R.id.tv_name)
TextView mTvName;
ViewHolder(View view) {
ButterKnife.bind(this, view);
}
}
}
