我有一个具有自定义适配器/列表视图的警报对话框。当用户点击列表视图中的项目时，我希望能够检索他们的选择（可绘制），然后将其设置为用于生成alertdialog的按钮中的drawable。
在ListView中选择任何内容的那一刻，我一直在崩溃。我相信这是因为我在ArrayList rowItems的每个位置存储了多个项目。
如何在onItemClickListener中仅引用所选listview项的drawable？
我希望能够将drawable设置为父项活动中可绘制的按钮。
public class PicturePickerFragment extends DialogFragment {
ListView listView;
ArrayList<RowItem> rowItems = new ArrayList<RowItem>();
// attach adapter to a list view
// A String[] array that will hold the names of the items.
public static final String[] descriptions = { "Baby", "Baking",
"Barbershop", "Camping", "Conference Call", "Funeral", "Gambling",
"Gardening", "Halloweeen", "Medicine", "Meeting", "Poker",
"Christmas", "Wedding" };
public static final Integer[] images = { R.drawable.baby,
R.drawable.baking, R.drawable.barbershop, R.drawable.camping,
R.drawable.conferencecall, R.drawable.funeral, R.drawable.gambling,
R.drawable.gardening, R.drawable.halloween, R.drawable.medicine,
R.drawable.meeting, R.drawable.poker, R.drawable.santa,
R.drawable.wedding };
Button btn_pic;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
LayoutInflater inflater = getActivity().getLayoutInflater();
View convertView = (View) inflater.inflate(R.layout.dialog_view, null);
// defining the alertdialog
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setView(convertView);
builder.setTitle(R.string.event_type);
// builder.setPositiveButton(R.string.select_picture,
// new DialogInterface.OnClickListener() {
// @Override
// public void onClick(DialogInterface dialog, int which) {
// call the method on the parent activity when
// user click the positive button
// }
// });
// populating the array list
for (int i = 0; i < descriptions.length; i++) {
RowItem item = new RowItem(images[i], descriptions[i]);
rowItems.add(item);
}
// defining listview and using array adapter
listView = (ListView) convertView.findViewById(R.id.listViewFragment2);
DrawableAdapter adapter = new DrawableAdapter(getActivity(), rowItems);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, final View view,
int position, long id) {
final Integer item = (Integer) parent
.getItemAtPosition(position);
}
});
adapter.addAll(rowItems);
return builder.create();
}
ADAPTER
public class DrawableAdapter extends ArrayAdapter<RowItem>{
public DrawableAdapter(Context context, List<RowItem> objects) {
super(context, R.layout.dialog_detail);
// TODO Auto-generated constructor stub
}
/* private view holder class */
private class ViewHolder {
ImageView imageView;
TextView txtDesc;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Get the data item for this position
RowItem item = getItem(position);
// Check if an existing view is being reused, otherwise inflate the view
ViewHolder viewHolder;
if (convertView == null) {
viewHolder = new ViewHolder();
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(R.layout.dialog_detail, null);
viewHolder.imageView = (ImageView) convertView
.findViewById(R.id.imageView1);
viewHolder.txtDesc = (TextView) convertView
.findViewById(R.id.textView1);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
// Populate the data into the template view using the data object
viewHolder.txtDesc.setText(item.getDesc());
viewHolder.imageView.setImageResource(item.getImageId());
// Return the completed view to render on screen
return convertView;
}
}
logcat的
03-09 23:27:17.285: E/AndroidRuntime(24674): FATAL EXCEPTION: main
03-09 23:27:17.285: E/AndroidRuntime(24674): java.lang.ClassCastException: com.example.datetracker.RowItem cannot be cast to java.lang.Integer
03-09 23:27:17.285: E/AndroidRuntime(24674): at com.example.datetracker.PicturePickerFragment$1.onItemClick(PicturePickerFragment.java:74)
03-09 23:27:17.285: E/AndroidRuntime(24674): at android.widget.AdapterView.performItemClick(AdapterView.java:298)
03-09 23:27:17.285: E/AndroidRuntime(24674): at android.widget.AbsListView.performItemClick(AbsListView.java:1129)
03-09 23:27:17.285: E/AndroidRuntime(24674): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2782)
03-09 23:27:17.285: E/AndroidRuntime(24674): at android.widget.AbsListView$1.run(AbsListView.java:3612)
03-09 23:27:17.285: E/AndroidRuntime(24674): at android.os.Handler.handleCallback(Handler.java:725)
03-09 23:27:17.285: E/AndroidRuntime(24674): at android.os.Handler.dispatchMessage(Handler.java:92)
03-09 23:27:17.285: E/AndroidRuntime(24674): at android.os.Looper.loop(Looper.java:137)
03-09 23:27:17.285: E/AndroidRuntime(24674): at android.app.ActivityThread.main(ActivityThread.java:5168)
03-09 23:27:17.285: E/AndroidRuntime(24674): at java.lang.reflect.Method.invokeNative(Native Method)
03-09 23:27:17.285: E/AndroidRuntime(24674): at java.lang.reflect.Method.invoke(Method.java:511)
03-09 23:27:17.285: E/AndroidRuntime(24674): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)
03-09 23:27:17.285: E/AndroidRuntime(24674): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:564)
03-09 23:27:17.285: E/AndroidRuntime(24674): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：2)
您可以直接从onClick
引用您的图像数组@Override
public void onItemClick(AdapterView<?> parent, final View view,
int position, long id) {
final int item = images[position];
btn_pic.setBackgroundResource(item);
}