Android 将 ArrayAdapter 转换为 CursorAdapter 以在 SearchView 中使用

Converting an ArrayAdapter to CursorAdapter for use in a SearchView

提问by Behzad Momahed Heravi

How can I convert an ArrayAdapter<String>of static data into a CursorAdapterfor using Suggestion Listener in SearchView? I have constructed the ArrayAdapter<String>from static data (allString)

如何将 的ArrayAdapter<String>静态数据转换为CursorAdapter用于在 中使用建议侦听器的SearchView？我已经ArrayAdapter<String>从静态数据 ( allString)

ArrayAdapter<String> searchAdapter = new ArrayAdapter<String>(context, R.layout.listitem, allString);

and I use it for an MultiAutoCompleteTextViewwhich works fine in devices with API level less than 11

我将它用于MultiAutoCompleteTextView在 API 级别低于 11 的设备中正常工作的

MultiAutoCompleteTextView findTextView.setAdapter(searchAdapter);

However my target API is level is 11 and for API>10 I use an ActionBarwithin which I would like to have a SearchView instead.

然而，我的目标 API 是 11 级，对于 API>10，我使用了一个ActionBar，我希望在其中使用SearchView。

Here's what I have tried: It does show the ActionBarwith the embedded SearchViewbut does not give any suggestions as it would in the MultiAutoCompleteTextView.

这是我尝试过的：它确实显示了ActionBar嵌入式，SearchView但没有像在MultiAutoCompleteTextView.

@Override
public boolean onCreateOptionsMenu(Menu menu) {     
        MenuInflater inflater = getMenuInflater();

         if (android.os.Build.VERSION.SDK_INT > 10){
             inflater.inflate(R.menu.menu11, menu);
             searchView = (SearchView) menu.findItem(R.id.MENU_SEARCH).getActionView();
             int[] to = {0};
             CursorAdapter cursorAdapter = new SimpleCursorAdapter(context, R.layout.listitem, null, allBusStopString, to);
             searchView.setSuggestionsAdapter(cursorAdapter);
             searchView.setOnSuggestionListener(new OnSuggestionListener() {

                @Override
                public boolean onSuggestionClick(int position) {
                    String selectedItem = (String)cursorAdapter.getItem(position);
                    Log.v("search view", selectedItem);
                    return false;
                }

                @Override
                public boolean onSuggestionSelect(int position) {
                    return false;
                }
             });  
         }else{
             inflater.inflate(R.menu.menu, menu);
         }

    return true;
}

回答by pawelzieba

That's strange SearchView.setSuggestionsAdapteraccepts CursorAdapter only.

奇怪的是SearchView.setSuggestionsAdapter只接受 CursorAdapter。

You could create MatrixCursorand fill it with data from String array. I hope you have small data collection.

您可以创建MatrixCursor并用字符串数组中的数据填充它。我希望你有小数据收集。

Then pass the cursor to CursorAdapter.

然后将光标传递给 CursorAdapter。

String[] columnNames = {"_id","text"}
MatrixCursor cursor = new MatrixCursor(columnNames);
String[] array = getResources().getStringArray(R.array.allStrings); //if strings are in resources
String[] temp = new String[2];
int id = 0;
for(String item : array){
    temp[0] = Integer.toString(id++);
        temp[1] = item;
    cursor.addRow(temp);
}               
String[] from = {"text"}; 
int[] to = {R.id.name_entry};
busStopCursorAdapter = new SimpleCursorAdapter(context, R.layout.listentry, cursor, from, to);

回答by kosiara - Bartosz Kosarzycki

I was facing similar problem. You can use SearchView.setSuggestionsAdapter()which only accepts CursorAdapter. On the other hand... what's the point? If you use the standard <android.support.v7.widget.SearchView />then it contains SearchAutoComplete which extends AppCompatAutoCompleteTextView inside. The following code worked for me:

我面临着类似的问题。您可以使用仅接受CursorAdapter 的SearchView.setSuggestionsAdapter()。另一方面……有什么意义？如果您使用该标准，那么它包含 SearchAutoComplete，它在内部扩展 AppCompatAutoCompleteTextView。以下代码对我有用：<android.support.v7.widget.SearchView />

List<String> items = Lists.newArrayList(new String[] {"aaaaa", "bbbbb", "ccccc", "ddddd"});
SearchView searchView = (SearchView) findViewById(R.id.autocomplete_searchview);
SearchView.SearchAutoComplete searchSrcTextView = (SearchView.SearchAutoComplete) findViewById(android.support.v7.appcompat.R.id.search_src_text);
searchSrcTextView.setThreshold(1);
searchSrcTextView.setAdapter(new SuggestionAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, items));
searchSrcTextView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        return;
    }
});

and the following Adapter code:

以及以下适配器代码：

public class SuggestionAdapter<T> extends ArrayAdapter<T> {

    private List<T> items;
    private List<T> filteredItems;
    private ArrayFilter mFilter;

    public SuggestionAdapter(Context context, @LayoutRes int resource, @NonNull List<T> objects) {
        super(context, resource, Lists.<T>newArrayList());
        this.items = objects;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public T getItem(int position) {
        return items.get(position);
    }

    @Override
    public Filter getFilter() {
        if (mFilter == null) {
            mFilter = new ArrayFilter();
        }
        return mFilter;
    }

    public int getCount() {
        //todo: change to pattern-size
        return items.size();
    }

    private class ArrayFilter extends Filter {
        @Override
        protected FilterResults performFiltering(CharSequence prefix) {
            FilterResults results = new FilterResults();

            //custom-filtering of results
            results.values = items;
            results.count = items.size();

            return results;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            filteredItems = (List<T>) results.values;
            if (results.count > 0) {
                notifyDataSetChanged();
            } else {
                notifyDataSetInvalidated();
            }
        }
    }
}