为自定义 Listview 添加搜索到自定义 SimpleAdapter
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【中文标题】为自定义 Listview 添加搜索到自定义 SimpleAdapter【英文标题】：Adding Search to Custom SimpleAdapter for Custom Listview 【发布时间】：2017-08-24 14:31:59 【问题描述】：我的 ListView 工作得非常好。现在我想在 listItem 行的一些文本视图上添加搜索工具。
例如，我在工具栏中有一个 editText 或 Searchview。 我的 ListView 有一项，即状态字段。现在我只想从列表视图中搜索状态。
我在互联网上找到了许多解决方案，但我有我的自定义简单适配器类，我不知道如何在其中添加搜索。
这是我的 ExtendedSimpleAdapter 代码：
public class ExtendedSimpleAdapter extends SimpleAdapter implements Filterable
List<? extends Map<String, ?>> map; // if fails to compile, replace with List<HashMap<String, Object>> map
String[] from;
int layout;
int[] to;
private ArrayList<Map<String, ?>> mUnfilteredData;
//private ArrayList<Product> mDisplayedValues;
Context context;
private Filter mFilter;
LayoutInflater mInflater;
public ExtendedSimpleAdapter(Context context, List<? extends Map<String, ?>> data, // if fails to compile, do the same replacement as above on this line
int resource, String[] from, int[] to)
super(context, data, resource, from, to);
layout = resource;
map = data;
this.from = from;
this.to = to;
this.context = context;
@Override
public int getCount()
return map.size();
@Override
public Object getItem(int position)
return map.get(position);
@Override
public long getItemId(int position)
return position;
@Override
public View getView(int position, View convertView, ViewGroup parent)
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
return this.createViewFromResource(position, convertView, parent, layout);
private View createViewFromResource(int position, View convertView,
ViewGroup parent, int resource)
View v;
if (convertView == null)
v = mInflater.inflate(resource, parent, false);
else
v = convertView;
this.bindView(position, v);
return v;
private void bindView(int position, View view)
final Map dataSet = map.get(position);
if (dataSet == null)
return;
final ViewBinder binder = super.getViewBinder();
final int count = to.length;
for (int i = 0; i < count; i++)
final View v = view.findViewById(to[i]);
if (v != null)
final Object data = dataSet.get(from[i]);
String text = data == null ? "" : data.toString();
if (text == null)
text = "";
boolean bound = false;
if (binder != null)
bound = binder.setViewValue(v, data, text);
if (!bound)
if (v instanceof Checkable)
if (data instanceof Boolean)
((Checkable) v).setChecked((Boolean) data);
else if (v instanceof TextView)
// Note: keep the instanceof TextView check at the bottom of these
// ifs since a lot of views are TextViews (e.g. CheckBoxes).
setViewText((TextView) v, text);
else
throw new IllegalStateException(v.getClass().getName() +
" should be bound to a Boolean, not a " +
(data == null ? "<unknown type>" : data.getClass()));
else if (v instanceof TextView)
// Note: keep the instanceof TextView check at the bottom of these
// ifs since a lot of views are TextViews (e.g. CheckBoxes).
setViewText((TextView) v, text);
else if (v instanceof ImageView)
if (data instanceof Integer)
setViewImage((ImageView) v, (Integer) data);
else if (data instanceof Bitmap)
setViewImage((ImageView) v, (Bitmap) data);
else
setViewImage((ImageView) v, text);
else if (v instanceof RatingBar)
float score = Float.parseFloat(data.toString()); //2
((RatingBar) v).setRating(score);
else
throw new IllegalStateException(v.getClass().getName() + " is not a " +
" view that can be bounds by this SimpleAdapter");
private void setViewImage(ImageView v, Bitmap bmp)
v.setImageBitmap(bmp);
public Filter getFilter()
if (mFilter == null)
mFilter = new SimpleFilter();
return mFilter;
private class SimpleFilter extends Filter
@Override
protected FilterResults performFiltering(CharSequence prefix)
FilterResults results = new FilterResults();
if (mUnfilteredData == null)
mUnfilteredData = new ArrayList<Map<String, ?>>(map);
if (prefix == null || prefix.length() == 0)
ArrayList<Map<String, ?>> list = mUnfilteredData;
results.values = list;
results.count = list.size();
else
String prefixString = prefix.toString().toLowerCase();
ArrayList<Map<String, ?>> unfilteredValues = mUnfilteredData;
int count = unfilteredValues.size();
ArrayList<Map<String, ?>> newValues = new ArrayList<Map<String, ?>>(count);
for (int i = 0; i < count; i++)
Map<String, ?> h = unfilteredValues.get(i);
if (h != null)
int len = to.length;
for (int j = 0; j < len; j++)
String str = (String) h.get(from[j]);
String[] words = str.split(" ");
int wordCount = words.length;
for (int k = 0; k < wordCount; k++)
String word = words[k];
if (word.toLowerCase().startsWith(prefixString))
newValues.add(h);
break;
results.values = newValues;
results.count = newValues.size();
return results;
@Override
protected void publishResults(CharSequence constraint, FilterResults results)
//noinspection unchecked
map = (List<Map<String, ?>>) results.values;
if (results.count > 0)
notifyDataSetChanged();
else
notifyDataSetInvalidated();
这里我将适配器设置为 listview ：
evc = new ExtendedSimpleAdapter(Users.this, contactList,R.layout.new_dr_list,
new String[]"picture","name","speciality" ,"status","education","experience","rating",
new int[]R.id.imug_p1,R.id.usr_dname,R.id.dspecs,R.id.statusp,R.id.educ,R.id.exper,R.id.ratingBar1);
usersList.setAdapter(evc);
((BaseAdapter) evc).notifyDataSetChanged();
如您所见，我在 simpleadapter 中有一个标签状态，我如何对其执行搜索..？？
编辑
现在当我从 searview 栏中搜索内容时出现此错误。
java.lang.NullPointerException: Attempt to invoke interface method 'int java.util.List.size()' on a null object reference
at com.adnan.zwd.hidoctor.Chat.ExtendedSimpleAdapter.getCount(ExtendedSimpleAdapter.java:52)
at android.widget.AdapterView.checkFocus(AdapterView.java:739)
at android.widget.AdapterView$AdapterDataSetObserver.onInvalidated(AdapterView.java:862)
at android.widget.AbsListView$AdapterDataSetObserver.onInvalidated(AbsListView.java:6211)
at android.database.DataSetObservable.notifyInvalidated(DataSetObservable.java:50)
at android.widget.BaseAdapter.notifyDataSetInvalidated(BaseAdapter.java:59)
at com.adnan.zwd.hidoctor.Chat.ExtendedSimpleAdapter$SimpleFilter.publishResults(ExtendedSimpleAdapter.java:222)
at android.widget.Filter$ResultsHandler.handleMessage(Filter.java:282)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
【问题讨论】：
【参考方案1】：您可以在 cicle 中使用 if(from[i].contains(constraints))，将结果保存在 String[] 中，最后将该数组分配给 Adapter 以便它使用它。不过我建议你改成 ReciclerView 而不是 ListView。
示例...没有对其进行测试，但应该可以工作或至少对您有所帮助..我希望。有趣的事实......我也从你的代码中学到了一些东西。非常感谢您的机会。
@Override
public Filter getFilter()
Filter filter = new Filter()
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results)
from = (String[]) results.values; // change dateset
notifyDataSetChanged();
// notifies the data with new filtered values
@Override
protected FilterResults performFiltering(CharSequence constraint)
FilterResults results = new Filter.FilterResults(); // Holds the results of a filtering operation in values
// ArrayList<Product> FilteredArrList = new ArrayList<Product>();
String [] filtered = new String[from.length];
int index=0;
for(int i=0;i<from.length;i++)
if(from[i].contains(constraint))
filtered[index++]=from[i];
results.values = filtered;
results.count=index;
return results;
;
return filter;
【讨论】：
你能举个例子吗？我是自定义适配器的新手。即使我发现 recyclerView 真的很难和我一起去，请建议我应该如何让它工作。谢谢 那是因为我更新了数据源但没有更新List<? extends Map<String, ?>> map; 对象，对不起，你用它来获取数据集中的对象数量，实际上可能只是通过更新“地图”你可以让它工作。因此，在 publishResults() 中放置您的地图代码以仅包含过滤后的结果。以上是关于为自定义 Listview 添加搜索到自定义 SimpleAdapter的主要内容，如果未能解决你的问题，请参考以下文章
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