我在res/drawable
中有许多jpeg图像,我正在尝试根据数据库行ID动态查找图像,并在“ListView”内的ImageView
中显示相应的图像。
以下是ListView的每一行的xml布局:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/list_selector"
android:orientation="horizontal"
android:padding="5dip" >
<!-- ListRow Left side Thumbnail image -->
<LinearLayout android:id="@+id/thumbnail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="3dip"
android:layout_alignParentLeft="true"
android:background="@drawable/image_bg"
android:layout_marginRight="5dip">
<ImageView
android:id="@+id/list_image"
android:layout_width="50dip"
android:layout_height="50dip"/>
</LinearLayout>
<!-- Title -->
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/thumbnail"
android:layout_toRightOf="@+id/thumbnail"
android:textColor="#040404"
android:typeface="sans"
android:textSize="15dip"
android:textStyle="bold"/>
<!-- Author -->
<TextView
android:id="@+id/author"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/title"
android:textColor="#343434"
android:textSize="10dip"
android:layout_marginTop="1dip"
android:layout_toRightOf="@+id/thumbnail" />
<!-- Rightend Arrow -->
<ImageView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/arrow"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"/>
以下是ArrayAdapter
的来源,我尝试将图片动态加载到ImageView
标识的R.id.list_image
。
public class TitleListingArrayAdapter extends ArrayAdapter<Title> {
private List<Title> items;
private Context context;
public TitleListingArrayAdapter(Context context, int textViewResourceId, List<Title> items) {
super(context, textViewResourceId, items);
this.items = items;
this.context = context;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
if (view == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.titlelisting_single_row, null);
}
Title item = items.get(position);
if (item!= null) {
TextView titleView = (TextView) view.findViewById(R.id.title);
if (titleView != null) {
titleView.setText(item.getName());
}
TextView authorView = (TextView) view.findViewById(R.id.author);
if (authorView != null) {
authorView.setText(item.getAuthor());
}
ImageView iconView = (ImageView) view.findViewById(R.id.list_image);
iconView.setImageResource(lookupResourceId(context, item.getID()));
}
return view;
}
private int lookupResourceId(Context context, String id) {
String resourceName = "thumb_"+id+".jpeg";
return context.getResources().getIdentifier(resourceName, "drawable", context.getPackageName());
}
}
任何人都可以告诉我为什么图像没有正确加载以及我如何解决它?
答案 0 :(得分:1)
private int lookupResourceId(Context context, String id) {
String resourceName = "thumb_"+id;
return context.getResources().getIdentifier(resourceName, "drawable", context.getPackageName());
}
尝试省略扩展名。