在AutoCompleteTextView项目建议中添加刻度符号,可以通过自定义适配器来实现。以下是一个示例代码:
<AutoCompleteTextView
android:id="@+id/autoCompleteTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:completionThreshold="1"
android:dropDownHeight="wrap_content"
android:dropDownWidth="match_parent"
android:hint="请输入关键字"
android:inputType="textAutoComplete"
android:maxLines="1" />
public class CustomAdapter extends ArrayAdapter<String> {
private List<String> suggestions;
public CustomAdapter(Context context, int resource, List<String> objects) {
super(context, resource, objects);
suggestions = new ArrayList<>(objects);
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
if (convertView == null) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.item_suggestion, parent, false);
}
TextView textView = convertView.findViewById(R.id.textViewSuggestion);
String suggestion = getItem(position);
if (suggestion != null) {
textView.setText("● " + suggestion); // 添加刻度符号
}
return convertView;
}
@NonNull
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults filterResults = new FilterResults();
List<String> filteredSuggestions = new ArrayList<>();
if (constraint != null) {
for (String suggestion : suggestions) {
if (suggestion.toLowerCase().startsWith(constraint.toString().toLowerCase())) {
filteredSuggestions.add(suggestion);
}
}
filterResults.values = filteredSuggestions;
filterResults.count = filteredSuggestions.size();
}
return filterResults;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
clear();
if (results != null && results.count > 0) {
addAll((List<String>) results.values);
}
notifyDataSetChanged();
}
};
return filter;
}
}
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/textViewSuggestion"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:textSize="16sp" />
AutoCompleteTextView autoCompleteTextView = findViewById(R.id.autoCompleteTextView);
List<String> suggestions = Arrays.asList("Apple", "Banana", "Cherry", "Durian", "Elderberry");
CustomAdapter adapter = new CustomAdapter(this, R.layout.item_suggestion, suggestions);
autoCompleteTextView.setAdapter(adapter);
这样,当用户输入关键字时,AutoCompleteTextView会根据输入的内容过滤建议项,并在每个建议项前添加刻度符号"●"。你可以根据实际需求修改刻度符号的样式和位置。
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