在Android中的GridView里面的Expandable列表 [英] GridView inside Expandable list in android
本文介绍了在Android中的GridView里面的Expandable列表的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想在一个可扩展的列表中放置一个带有图像的gridview ...我已经做到了，但gridview不显示所有的项目...
如何让我的可扩展列表子适应gridview大小？
LIST ADAPTER
public class CustomListAdapter extends BaseExpandableListAdapter
{
String [] catg = {Administração，Escritorio e Industria，Cultura e Entretenimento，Educação eCrianças，Eventos e Estado do tempo，Amigos，Familia eHabitações，Multimédia，Diversos，Númerose Letras，Restaurantes e Hoteis，Desporto，Saude e Beleza，Lojas ，Turismo e Natureza，Transportes};
上下文myctx;
$ b @覆盖
public Object getChild（int groupPosition，int childPosition）
{
// TODO自动生成的方法存根
返回空值;
}
@Override
public long getChildId（int groupPosition，int childPosition）
{
return childPosition;
$ b @Override
public View getChildView（int groupPosition，int childPosition，boolean isLastChild，View convertView，ViewGroup parent）
{
ViewGroup item = getViewGroupChild（convertView，parent）;
GridView标签=（GridView）item.findViewById（ipvc.estg.placebook.R.id.gridview）;
label.setAdapter（new GridAdapter（parent.getContext（），groupPosition + 1））;
退货项目;
}
private ViewGroup getViewGroupChild（View convertView，ViewGroup parent）
{
//父类将是ListActivity中的ListView
if（convertView instanceof ViewGroup）
{
return（ViewGroup）convertView;
}
上下文context = parent.getContext（）;
LayoutInflater inflater = LayoutInflater.from（context）;
ViewGroup item =（ViewGroup）inflater.inflate（ipvc.estg.placebook.R.layout.expandable_list_row，null）;
退货项目;
}
@Override
public int getChildrenCount（int groupPosition）
{
return 1;
}
@Override
public Object getGroup（int groupPosition）
{
return catg [groupPosition];
}
@Override
public int getGroupCount（）
{
return catg.length;
}
@Override
public long getGroupId（int groupPosition）
{
return groupPosition;
$ b @Override
public View getGroupView（int groupPosition，boolean isExpanded，View convertView，ViewGroup parent）
{
View item = getViewGroupGroup（convertView，parent）;
TextView text =（TextView）item.findViewById（android.R.id.text1）;
text.setText（catg [groupPosition]）;
退货项目;
}
private查看getViewGroupGroup（查看convertView，ViewGroup父类）
{
//父类将是ListActivity中的ListView
if（convertView instanceof View）
{
return（View）convertView;
}
上下文context = parent.getContext（）;
LayoutInflater inflater = LayoutInflater.from（context）;
查看item1 =（查看）inflater.inflate（android.R.layout.simple_expandable_list_item_1，null）;
返回item1;
}
@Override
public boolean hasStableIds（）
{
// TODO自动生成的方法存根
return false;
$ b @Override
public boolean isChildSelectable（int groupPosition，int childPosition）
{
// TODO自动生成方法存根
返回true;
$ b $ / code $ / pre
$ b LIST ROW LAYOUT
<？xml version =1.0encoding =utf-8？>
< LinearLayout
android：id =@ + id / linearLayout1
android：layout_width =fill_parent
android：layout_height =fill_parent
xmlns：机器人= http://schemas.android.com/apk/res/android >
< GridView
xmlns：android =http://schemas.android.com/apk/res/android
android：id =@ + id / gridview
android：layout_width =fill_parent
android：layout_height =fill_parent
android：columnWidth =50dp
android：numColumns =auto_fit
android：verticalSpacing = 10dp
android：horizontalSpacing =10dp
android：stretchMode =columnWidth
android：gravity =center/>
< / LinearLayout>
解决方案这种情况，但到目前为止没有找到任何东西，所以我做了一个解决方法。
这种解决方法假设您知道/可以检索列的宽度，以及网格单元格渲染器的高度（布局xmls中设置的dp大小）。
您应该在 ExpandableListAdapter中插入更多行的 getChildView 方法：
@覆盖
public View getChildView（int groupPosition，int childPosition，boolean isLastChild，View convertView，ViewGroup parent）
{
ViewGroup item = getViewGroupChild（convertView，parent）;
GridView标签=（GridView）item.findViewById（ipvc.estg.placebook.R.id.gridview）;
label.setAdapter（new GridAdapter（parent.getContext（），groupPosition + 1））;
//初始化下面的变量（我已经根据你的布局完成了
//注意：rowHeightDp基于我的grid_cell.xml，这就是我的$ b的高度$ b //分配给网格中的项目
final int spacingDp = 10;
final int colWidthDp = 50;
final int rowHeightDp = 20;
//将dp值转换为像素
final float COL_WIDTH = getBaseContext（）。getResources（）。getDisplayMetrics（）。density * colWidthDp;
final float ROW_HEIGHT = getBaseContext（）。getResources（）。getDisplayMetrics（） ）.density * rowHeightDp;
final float SPACING = getBaseContext（）。getResources（）。getDisplayMetrics（）。density * spacingDp;
//根据您的显示计算列数和行数
final int colCount =（int）Math.floor（（parentView.getWidth（） - （2 * SPACING））/（COL_WIDTH + SPACING））;
final int rowCount =（int）Math.ceil （（intValues.size（）+ 0d）/ colCount）;
//计算e当前网格的高度
final int GRID_HEIGHT = Math.round（rowCount *（ROW_HEIGHT + SPACING））;
//设置当前网格的高度
label.getLayoutParams（）。height = GRID_HEIGHT;
退货项目;
}
通过上述添加，我可以生成以下显示布局： p>
和
我希望它可以帮助你。
I want to put an gridview with images inside an expandable list...I've already make that, but the gridview don't show all item...
How can i make my expandable list child adapt to the gridview size?
LIST ADAPTER
public class CustomListAdapter extends BaseExpandableListAdapter
{
String[] catg = { "Administração, Escritorio e Industria", "Cultura e Entretenimento", "Educação e Crianças", "Eventos e Estado do tempo", "Amigos, Familia e Habitações", "Multimédia", "Diversos", "Números e Letras", "Restaurantes e Hoteis", "Desporto, Saude e Beleza", "Lojas", "Turismo e Natureza", "Transportes" };
Context myctx;
@Override
public Object getChild(int groupPosition, int childPosition)
{
// TODO Auto-generated method stub
return null;
}
@Override
public long getChildId(int groupPosition, int childPosition)
{
return childPosition;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent)
{
ViewGroup item = getViewGroupChild(convertView, parent);
GridView label = (GridView) item.findViewById(ipvc.estg.placebook.R.id.gridview);
label.setAdapter(new GridAdapter(parent.getContext(), groupPosition+1));
return item;
}
private ViewGroup getViewGroupChild(View convertView, ViewGroup parent)
{
// The parent will be our ListView from the ListActivity
if (convertView instanceof ViewGroup)
{
return (ViewGroup) convertView;
}
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
ViewGroup item = (ViewGroup) inflater.inflate(ipvc.estg.placebook.R.layout.expandable_list_row, null);
return item;
}
@Override
public int getChildrenCount(int groupPosition)
{
return 1;
}
@Override
public Object getGroup(int groupPosition)
{
return catg[groupPosition];
}
@Override
public int getGroupCount()
{
return catg.length;
}
@Override
public long getGroupId(int groupPosition)
{
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent)
{
View item = getViewGroupGroup(convertView, parent);
TextView text = (TextView) item.findViewById(android.R.id.text1);
text.setText(catg[groupPosition]);
return item;
}
private View getViewGroupGroup(View convertView, ViewGroup parent)
{
// The parent will be our ListView from the ListActivity
if (convertView instanceof View)
{
return (View) convertView;
}
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
View item1 = (View) inflater.inflate(android.R.layout.simple_expandable_list_item_1, null);
return item1;
}
@Override
public boolean hasStableIds()
{
// TODO Auto-generated method stub
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition)
{
// TODO Auto-generated method stub
return true;
}
}
LIST ROW LAYOUT
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<GridView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/gridview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:columnWidth="50dp"
android:numColumns="auto_fit"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center" />
</LinearLayout>
解决方案 I've done tons of searches my own for solving this situation, but didn't find anything so far, so i've made a workaround.
This workaround assumes that you know / can retrieve the width of your columns, and the height of your grid cell renderers (the dp size set in your layout xmls).
You should insert a few more lines inside your ExpandableListAdapter's getChildView method:
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent)
{
ViewGroup item = getViewGroupChild(convertView, parent);
GridView label = (GridView) item.findViewById(ipvc.estg.placebook.R.id.gridview);
label.setAdapter(new GridAdapter(parent.getContext(), groupPosition+1));
// initialize the following variables (i've done it based on your layout
// note: rowHeightDp is based on my grid_cell.xml, that is the height i've
// assigned to the items in the grid.
final int spacingDp = 10;
final int colWidthDp = 50;
final int rowHeightDp = 20;
// convert the dp values to pixels
final float COL_WIDTH = getBaseContext().getResources().getDisplayMetrics().density * colWidthDp;
final float ROW_HEIGHT = getBaseContext().getResources().getDisplayMetrics().density * rowHeightDp;
final float SPACING = getBaseContext().getResources().getDisplayMetrics().density * spacingDp;
// calculate the column and row counts based on your display
final int colCount = (int)Math.floor((parentView.getWidth() - (2 * SPACING)) / (COL_WIDTH + SPACING));
final int rowCount = (int)Math.ceil((intValues.size() + 0d) / colCount);
// calculate the height for the current grid
final int GRID_HEIGHT = Math.round(rowCount * (ROW_HEIGHT + SPACING));
// set the height of the current grid
label.getLayoutParams().height = GRID_HEIGHT;
return item;
}
With the addition above i was able to produce the following displayed layouts:
and
I hope it can help you as well.
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