android中的可扩展列表中的GridView [英] GridView inside Expandable list in android

问题描述

我想将带有图像的 gridview 放在可扩展列表中...我已经做到了，但是 gridview 没有显示所有项目...

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...

如何让我的可扩展列表子项适应 gridview 大小?

How can i make my expandable list child adapt to the gridview size?

列表适配器

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;
    }

}

列表行布局

<?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>

推荐答案

为了解决这种情况，我自己进行了大量搜索，但目前没有找到任何东西，所以我做了一个解决方法.

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.

此解决方法假设您知道/可以检索列的宽度和网格单元渲染器的高度(布局 xml 中设置的 dp 大小).

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).

您应该在 ExpandableListAdapter 的 getChildView 方法中再插入几行:

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;
}

通过上述添加，我能够生成以下显示布局:

With the addition above i was able to produce the following displayed layouts:

和

希望它也能帮到你.

这篇关于android中的可扩展列表中的GridView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！