java - AutoCompleteTextView 建议无法更新？

Question

我正在尝试根据另一个 View (微调器)中选择的选项来更改 AutoCompleteTextView 的建议列表。不幸的是，这个 TextView 的适配器似乎没有从另一个 View 的 setOnClickListener 方法中得到通知。我认为这可能是由于上下文的差异而发生的？如果是这样，我该如何解决它？

public class AutoCompleteGOTPointAdapter extends ArrayAdapter<GOTPoint> {

    Context mContext;
    List<GOTPoint> GOTPointListAll; 

    public AutoCompleteGOTPointAdapter(@NonNull Context context, @NonNull List<GOTPoint> GOTPointList) {
        super(context, 0, GOTPointList);
        this.mContext = context;
        this.GOTPointListAll = new ArrayList<>(GOTPointList);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) { 
        if (convertView == null) { 
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.one_line_spinner,parent,false); 
        }

        TextView textViewGOTPointName = convertView.findViewById(R.id.my_spinner);

        GOTPoint GOTPoint = this.getItem(position);

        if (GOTPoint != null) {
            textViewGOTPointName.setText(GOTPoint.getName());
        }

        return convertView;
    }

    @Override
    public Filter getFilter() {
        return new Filter() {
            @Override
            public String convertResultToString(Object resultValue) {
                return ((GOTPoint) resultValue).getName();
            }

            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults filterResults = new FilterResults();
                List<GOTPoint> suggestion = new ArrayList<>();

                if (constraint == null || constraint.length() == 0) { //
                    suggestion.addAll(GOTPointListAll);
                }
                else {
                    String filterPattern = constraint.toString().toLowerCase().trim();
                    for (GOTPoint gotPoint : GOTPointListAll) {
                        if (gotPoint.getName().toLowerCase().contains(filterPattern)) { 
                            suggestion.add(gotPoint);
                        }
                    }
                }

                filterResults.values = suggestion;
                filterResults.count = suggestion.size();

                return filterResults;
            }

            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {

                clear();
                addAll((List) results.values);
                notifyDataSetChanged();
            }
        };
    }
}

public class SearchActivity extends AppCompatActivity {
    Spinner spnMountainChains;
    AutoCompleteTextView edtEndPoint;
    AutoCompleteGOTPointAdapter GOTPointAdapter;
    List<GOTPoint> GOTPoints;

     @Override
    protected void onCreate(Bundle savedInstanceState) {
        spnMountainChains = findViewById(R.id.spn_mountain_chains);
        edtEndPoint = findViewById(R.id.actv_end_point);
        GOTPoints = new ArrayList<GOTPoint>();
        GOTPointAdapter = new AutoCompleteGOTPointAdapter( SearchActivity.this,GOTPoints);
        edtEndPoint.setAdapter(GOTPointAdapter);

        spnMountainChains.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                MountainChain mountainChain = (MountainChain) spnMountainChains.getSelectedItem();

                List<GOTPoint> filteredGOTPoints = dao.getGOTPoints(mountainChain.getId());

                GOTPointAdapter.clear();
                GOTPointAdapter.addAll(filteredGOTPoints);

//                GOTPoints.clear();            // Also doesn't work
//                GOTPoints.addAll(filteredGOTPoints); 
//                GotPointAdapter.notifyDataSetChanged();
            }

    }
}

one_line_spinner.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/my_spinner"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:maxLines="1"
    android:textSize="21sp">
</TextView>

Answer 1

好的，感谢@MikeM。评论 我设法找到了解决方案。问题确实是初始化后没有更改 GOTPointsListAll 。要在从微调器中选择一个项目时更改它，我必须做几件事:

• 向适配器类添加 GOTPointList 属性并在构造函数中初始化它:

      Context mContext;
      List<GOTPoint> GOTPointListAll;
      List<GOTPoint> GOTPointList;
  
      public AutoCompleteGOTPointAdapter(@NonNull Context context, @NonNull List<GOTPoint> GOTPointList) {
          super(context, 0, GOTPointList);
          this.mContext = context;
          this.GOTPointList = GOTPointLi
          this.GOTPointListAll = new ArrayList<>(GOTPointList);
      }
  

  • 覆盖我的适配器的notifyDataSetChanged方法:

      @Override
      public void notifyDataSetChanged() {
          GOTPointListAll.clear();
          GOTPointListAll.addAll(GOTPointList);
          notifyDataSetChangedSuper();
      }
  

哪里

• notifyDataSetChangedSuper 是:

      private void notifyDataSetChangedSuper() {
          super.notifyDataSetChanged();
      }
  

我可能应该将对 GOTPoinListAll 的操作放到另一个函数中，而不是覆盖现有函数，但这是一个细节。拥有这两个函数的原因是，仅在选择微调项目时才需要更新 GOTPointListAll，并且 GOTPointList 需要更新<过滤完成后，始终。这就是为什么:

• 在publishResults()部分:

    clear();
    addAll((List) results.values);
    notifyDataSetChangedSuper();

应更改为:

    GOTPointList.clear();
    GOTPointList.addAll((List) results.values);
    notifyDataSetChangedSuper();

• 最后在onItemSelected()中:

    GOTPoints.clear();
    GOTPoints.addAll(filteredGOTPoints);
    GOTPointAdapter.notifyDataSetChanged();

感谢您的帮助!