Question

我已经创建了自己的ArrayAdapter但是我遇到了getView方法的问题 - 它从未被调用过。我的Logcat只显示构造函数的日志，而不是getView。我已经尝试过更改为BaseAdapter并尝试重写getCount但没有运气，getView将不会被调用。我已经确保传入的列表不是空的，但仍然没有运气。这是我的代码：

public class ProgramSelectionSchoolAdapter extends ArrayAdapter<String> {

private ArrayList<String> schools;
private Activity context;

private static final String TAG = "ProgSelSchoolAdapter";

public ProgramSelectionSchoolAdapter(Activity context, ArrayList<String> schools) {
    super(context, R.layout.spinner_program_selection_row, schools);
    this.schools = schools;
    this.context = context;

    Log.v(TAG, "ProgramSelectionSchoolAdapter was created");
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View rowView = convertView;

    Log.v(TAG, "getView was called");

    ViewHolder holder;
    if (rowView == null) {
        holder = new ViewHolder();

        // Inflate the row layout
        LayoutInflater inflater = LayoutInflater.from(context);
        rowView = inflater.inflate(R.layout.spinner_program_selection_row, parent, false);

        // Use of view holder to save performance
        holder.spinnerItem = (TextView) rowView.findViewById(R.id.tvSpinnerItem);
        rowView.setTag(holder);
    } else {
        holder = (ViewHolder) rowView.getTag();
    }

    // Set the text for the view holder
    String school = schools.get(position);
    holder.spinnerItem.setText(school);

    Log.v(TAG, school + " added to spinnerItem");

    return rowView;
}

static class ViewHolder {
    public TextView spinnerItem;
}

}

以下是我如何使用适配器：

private void setUpSpinner() {

    // Construct a list to be used for storing unique school values for the adapter
    schools = new ArrayList<String>();

    // Query for all organizers
    ParseQuery<Organizer> query = ParseQuery.getQuery(Organizer.class);
    query.whereEqualTo(COLUMN_APP, APP_NAME);
    query.orderByAscending(COLUMN_SCHOOL);
    query.findInBackground(new FindCallback<Organizer>() {

        @Override
        public void done(List<Organizer> organizers, ParseException e) {
            if(e == null) {
                // All organizers for the chosen app was received successfully

                Log.v(TAG, "Organizers received successfully");

                // Go through all organizers and look for unique school values
                for (Organizer organizer : organizers) {

                    String school = organizer.getSchool();
                    if(!schools.contains(school)) {
                        // Add the unique school to the ArrayList
                        schools.add(school);

                        Log.v(TAG, school + " added to list");
                    }

                }

                // Create the adapter for the schools
                adapterSchools = new ProgramSelectionSchoolAdapter(ProgramSelection.this, schools);
            } else {
                // Something went wrong
                e.printStackTrace();
            }
        }
    });

    // Create spinner and set adapter
    spinnerPrograms = (Spinner) findViewById(R.id.spinnerPrograms);
    spinnerPrograms.setAdapter(adapterSchools);

}

我正在为应用程序中的另一个活动使用类似的适配器，那个工作正常。我错过了什么？任何帮助表示赞赏！

Answer 1

当*/5 * * * * wget -q localhost:8888/example/index.php/controller/function为空时，您正在呼叫spinnerPrograms.setAdapter(adapterSchools);。虽然看起来您正在将变量设置为新的ProgramSelectionSchoolAdapter，但直到后台任务完成后才会实际调用该代码。尝试使用adapterSchools方法调用setAdapter。

未调用ArrayAdapter中的getView

1 个答案: