Question

好吧，我有ListViewAdapter.java，看起来像是：

ListViewAdapter.java

public class ListViewItem {
    public final Drawable icon;       // the drawable for the ListView item ImageView
    public final String title;       // the text for the ListView item title
    public final String precio;      // the price for the ListView item
    public final String descuento;   // the price for the discount for the ListView item
     // the text for the ListView item description

    public ListViewItem(Drawable icon, String title, String precio, String descuento) {
        this.icon = icon;
        this.title = title;

        this.precio = precio;
        this.descuento = descuento;
    }
}

当我在Fragment上创建ListView时没有说错了......代码是：

 // initialize the items list
    mItems = new ArrayList<ListViewItem>();
    Resources resources = getResources();

    mItems.add(new ListViewItem(resources.getDrawable(R.drawable.tomate_oferta), getString(R.string.aim), getString(R.string.aim_precio), getString(R.string.aim_descuento)));
    mItems.add(new ListViewItem(resources.getDrawable(R.drawable.levadura_oferta), getString(R.string.youtube), getString(R.string.youtube_precio), getString(R.string.youtube_descuento)));
    mItems.add(new ListViewItem(resources.getDrawable(R.drawable.sopa_oferta), getString(R.string.bebo), getString(R.string.bebo_precio), getString(R.string.bebo_descuento)));
    mItems.add(new ListViewItem(resources.getDrawable(R.drawable.zumo_oferta), getString(R.string.pew), getString(R.string.pew_precio), getString(R.string.pew_descuento)));

    // initialize and set the list adapter
    setListAdapter(new ListViewDemoAdapter(getActivity(), mItems));
}

最后我的xml看起来像：

    ListViewItem.xml

        <?xml version="1.0" encoding="utf-8"?>
<!-- the parent view - provides the gray background -->
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center"
    android:gravity="center_vertical"
    android:background="@color/frame_background"
    android:padding="5dp" >

    <!-- the innner view - provides the white rectangle -->
    <RelativeLayout android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/frame" >

        <!-- the icon view -->
        <ImageView android:id="@+id/ivIcon"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:contentDescription="@string/icon_content_description"
            android:scaleType="fitXY"
            android:layout_alignParentLeft="true" />

        <!-- the container view for the title and description -->
        <RelativeLayout android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@id/ivIcon"
            android:layout_centerVertical="true" >

            <!-- the title view -->
            <TextView android:id="@+id/tvTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textColor="#0000FF"
                android:textAppearance="@android:style/TextAppearance.Medium" />

            <!-- the description view -->
            <TextView android:id="@+id/tvDiscount"
                android:layout_below="@id/tvTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textColor="#FF0000"
                android:textSize="12dp"
                android:textAppearance="@android:style/TextAppearance.Small" />
            <TextView android:id="@+id/tvPrice"
                android:layout_below="@id/tvTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textColor="#FF0000"
                android:textAppearance="@android:style/TextAppearance.Small" />

        </RelativeLayout>

    </RelativeLayout>

</RelativeLayout>

ListViewDemoAdapter.java

     public class ListViewDemoAdapter extends ArrayAdapter<ListViewItem> {

    public ListViewDemoAdapter(Context context, List<ListViewItem> items) {
        super(context, R.layout.listview_item, items);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder;

        if(convertView == null) {
            // inflate the GridView item layout
            LayoutInflater inflater = LayoutInflater.from(getContext());
            convertView = inflater.inflate(R.layout.listview_item, parent, false);

            // initialize the view holder
            viewHolder = new ViewHolder();
            viewHolder.ivIcon = (ImageView) convertView.findViewById(R.id.ivIcon);
            viewHolder.tvTitle = (TextView) convertView.findViewById(R.id.tvTitle);
            viewHolder.tvPrice = (TextView) convertView.findViewById(R.id.tvPrice);
            viewHolder.tvDiscount = (TextView) convertView.findViewById(R.id.tvPrice);
            convertView.setTag(viewHolder);
        } else {
            // recycle the already inflated view
            viewHolder = (ViewHolder) convertView.getTag();
        }

        // update the item view
        ListViewItem item = getItem(position);
        viewHolder.ivIcon.setImageDrawable(item.icon);
        viewHolder.tvTitle.setText(item.title);
        viewHolder.tvDiscount.setText(item.descuento);
        viewHolder.tvPrice.setText(item.precio);


        return convertView;
    }


    private static class ViewHolder {
        ImageView ivIcon;
        TextView tvTitle;
        TextView tvDiscount;
        TextView tvPrice;
    }
}

结果：

enter image description here

我不知道我做错了什么......我的主要问题是XML，但我看不到。

希望你们能帮助我。感谢。

Answer 1

你的问题似乎出现在你的layout_below属性中：

每个textView都设置为layout_below =＆＃34; @ id / tvTitle＆＃34;，但是每个其他textView都被tvPrice隐藏。你必须这样改变：

     <!-- the title view -->
        <TextView android:id="@+id/tvTitle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#0000FF"
            android:textAppearance="@android:style/TextAppearance.Medium" />

        <!-- the description view -->
        <TextView android:id="@+id/tvDiscount"
            android:layout_below="@id/tvTitle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#FF0000"
            android:textSize="12dp"
            android:textAppearance="@android:style/TextAppearance.Small" />
        <TextView android:id="@+id/tvPrice"
            android:layout_below="@id/tvDiscount"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#FF0000"
            android:textAppearance="@android:style/TextAppearance.Small" />

第二个问题：

在适配器中，您引用了具有相同ID _

的两个视图

      viewHolder.tvPrice = (TextView) convertView.findViewById(R.id.tvPrice);
        viewHolder.tvDiscount = (TextView) convertView.findViewById(R.id.tvPrice);

您必须将其更改为：

      viewHolder.tvDiscount = (TextView) convertView.findViewById(R.id.tvDiscount);

Answer 2

我看到了2个错误：

首先是布局，tvprice和tvdiscount重叠，因为它们显示在另一个上面。

        <!-- the description view -->
        <TextView android:id="@+id/tvDiscount"
            android:layout_below="@id/tvTitle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#FF0000"
            android:textSize="12dp"
            android:textAppearance="@android:style/TextAppearance.Small" />
        <TextView android:id="@+id/tvPrice"
            android:layout_below="@id/tvDiscount"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#FF0000"
            android:textAppearance="@android:style/TextAppearance.Small" />

其次，您没有设置电视折扣价值：

    // update the item view
    ListViewItem item = getItem(position);
    viewHolder.ivIcon.setImageDrawable(item.icon);
    viewHolder.tvTitle.setText(item.title);
    viewHolder.tvPrice.setText(item.precio);
    viewHolder.tvDiscount.setText(item.descuento);

另一个问题是viewHolder.tvDiscount指向tvPrice，更正如下：

viewHolder.tvDiscount = (TextView) convertView.findViewById(R.id.tvDiscount);

Answer 3

将您的xml更改为此。使用@ + id / tvTitle代替@ id / tvTitle

<!-- the innner view - provides the white rectangle -->
<RelativeLayout android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/frame" >

    <!-- the icon view -->
    <ImageView android:id="@+id/ivIcon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:contentDescription="@string/icon_content_description"
        android:scaleType="fitXY"
        android:layout_alignParentLeft="true" />

    <!-- the container view for the title and description -->
    <RelativeLayout android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/ivIcon"
        android:layout_centerVertical="true" >

        <!-- the title view -->
        <TextView android:id="@+id/tvTitle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#0000FF"
            android:textAppearance="@android:style/TextAppearance.Medium" />

        <!-- the description view -->
        <TextView android:id="@+id/tvDiscount"
            android:layout_below="@+id/tvTitle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#FF0000"
            android:textSize="12dp"
            android:textAppearance="@android:style/TextAppearance.Small" />
        <TextView android:id="@+id/tvPrice"
            android:layout_below="@+id/tvTitle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#FF0000"
            android:textAppearance="@android:style/TextAppearance.Small" />

    </RelativeLayout>

</RelativeLayout>

没有显示我的所有TextView

3 个答案:

第二个问题：