项目需求要用表格形式实现布局
但是!!!需要下拉和上拉加载数据。
因为项目里只有github里的XListView改造的ListView,又因为本人太笨太懒,不想写上拉下来gridview。。
<ListView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/listview" android:layout_width="match_parent" android:layout_height="match_parent" android:clipToPadding="false" android:divider="@null" android:dividerHeight="10dp" android:padding="10dp"></ListView>
就这样,因为本例讲的是listview嵌套gridview,不涉及上拉下拉,所以就用普通的listview咯
其实不自定义也行,当时为了防止gridview显示补全blabla的,还是写一个保证万无一失。
public class NoScrollGridView extends GridView {
public NoScrollGridView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public NoScrollGridView(Context context) {
super(context);
}
public NoScrollGridView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//核心在此
int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec+50);
}
}
<?xml version="1.0" encoding="utf-8"?>
<com.example.shen.sample.NoScrollGridView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/gridview" android:layout_width="match_parent" android:layout_height="wrap_content" android:numColumns="2" android:stretchMode="columnWidth" android:horizontalSpacing="10dp" android:verticalSpacing="10dp" />
<!-- 注意 android:numColumns="2" android:stretchMode="columnWidth" -->
<?xml version="1.0" encoding="utf-8"?>
<ImageView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:id="@+id/imageview" android:background="#000" android:layout_height="80dp" />
/** * Created by Shen on 2015/10/29. * 普通的适配器 */
public class GridViewAdapter extends BaseAdapter {
//数据源
private List<MainActivity.Bean> mList = new ArrayList<>();
private Context mContext;
public GridViewAdapter(Context context) {
super();
this.mContext = context;
}
public List<MainActivity.Bean> getmList() {
return mList;
}
public void setmList(List<MainActivity.Bean> mList) {
this.mList = mList;
}
@Override
public int getCount() {
return mList.size();
}
@Override
public MainActivity.Bean getItem(int position) {
return mList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(mContext).inflate(R.layout.gridview_item, parent, false);
holder = new ViewHolder(convertView);
} else {
holder = (ViewHolder) convertView.getTag();
}
//设置图片内容,本例木有图片
// holder.iv.setImageResource(getItem(position));
return convertView;
}
class ViewHolder {
ImageView iv;
public ViewHolder(View view) {
iv = (ImageView) view.findViewById(R.id.imageview);
view.setTag(this);
}
}
}
/** * Created by Shen on 2015/10/29. * ListView的数据源 * 在这里给gridview设置数据 * 重要 */
public class ListViewAdapter extends BaseAdapter {
//数据源
private List<MainActivity.Bean> mList = new ArrayList<>();
//列数
private int mColumn = 2;
private Context mContext;
public ListViewAdapter(Context context, List<MainActivity.Bean> list) {
super();
this.mContext = context;
this.mList = list;
}
/** * 这部很重要 *(核心) * @return listview的行数 */
@Override
public int getCount() {
int count = mList.size() / mColumn;
if (mList.size() % mColumn > 0) {
count++;
}
return count;
}
@Override
public MainActivity.Bean getItem(int position) {
return mList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(mContext).inflate(R.layout.listview_item, parent, false);
holder = new ViewHolder(convertView);
} else {
holder = (ViewHolder) convertView.getTag();
}
//定义gridView的数据源
List<MainActivity.Bean> list = new ArrayList<>();
//根据列数,将数据塞进去(核心)
for (int i = 0; i < mColumn; i++) {
int n = position * mColumn + i;
if (n < mList.size()) {
list.add(getItem(n));
}
}
//更新数据源(核心)
holder.adapter.setmList(list);
holder.adapter.notifyDataSetChanged();
return convertView;
}
class ViewHolder {
GridView gridView;
GridViewAdapter adapter;
public ViewHolder(View view) {
gridView = (GridView) view.findViewById(R.id.gridview);
//将adapter定义在此,优化滑动效果(核心)
adapter = new GridViewAdapter(mContext);
//在此设置适配器,数据源在getView中添加(核心)
gridView.setAdapter(adapter);
view.setTag(this);
}
}
}
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview);
ListView listview = (ListView) findViewById(R.id.listview);
List<Bean> list = new ArrayList();
for (int i = 0; i < 19; i++) {
list.add(new Bean());
}
ListViewAdapter adapter = new ListViewAdapter(this, list);
listview.setAdapter(adapter);
}
public static class Bean {
}
}