使用自定义(对象)适配器过滤ListView
使用自定义(对象)适配器过滤ListView
提问于 2011-04-26 00:02:23
我正在尝试实现对使用自定义对象适配器的ListView的过滤，但我找不到任何有用的示例。所包含的代码非常简单，所以请记住，我不能使用常规的ArrayAdapter。我在ListView上有一个EditText，当用户在EditText小部件中输入文本时，我希望通过EditText中编写的文本来过滤ListView。如有任何建议，我们将不胜感激！
下面是activity类的代码片段：
public class management_objects extends Activity {
private static List<User> UserList;
private EfficientAdapter adapter = null;
private ListView objectListView = null;
private EditText SearchText = null;
private static class EfficientAdapter extends BaseAdapter implements Filterable{
private LayoutInflater mInflater;
public EfficientAdapter(Context context) {
mInflater = LayoutInflater.from(context);
}
public int getCount() {
return UserList.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.imagelayout_2lines, null);
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.managementObjectText);
holder.subtext = (TextView) convertView.findViewById(R.id.managementObjectSubText);
holder.icon = (ImageView) convertView.findViewById(R.id.managementObjectIcon);
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
holder.text.setText(UserList.get(position).getFirstName());
holder.subtext.setText(UserList.get(position).getLastName());
holder.icon.setImageResource(R.drawable.user);
return convertView;
}
static class ViewHolder {
TextView text;
TextView subtext;
ImageView icon;
}
@Override
public Filter getFilter() {
return null;
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.adobjectlist);
Bundle extras = getIntent().getExtras();
SearchText = (EditText) findViewById(R.id.SearchBox);
SearchText.addTextChangedListener(filterTextWatcher);
objectListView = (ListView) findViewById(R.id.ObjectList);
objectListView.setOnItemClickListener(Item_Click);
adapter = new EfficientAdapter(this);
ComputerName = extras.getString("COMPUTER_NAME");
//Get User list from webservice
ShowUsers();
}下面是User类：
public class User {
private int UserId;
private String FirstName;
private String LastName;
public int getUserId() {
return UserId;
}
public void setUserId(int UserId) {
this.UserId = UserId;
}
public String getFirstName() {
return FirstName;
}
public void setFirstName(String FirstName) {
this.FirstName = FirstName;
}
public String getLastName() {
return LastName;
}
public void setLastName(String LastName) {
this.LastName = LastName;
}
}回答 3
Stack Overflow用户
发布于 2012-11-29 00:01:17
下面是一个有趣的例子
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
final FilterResults oReturn = new FilterResults();
final ArrayList<station> results = new ArrayList<station>();
if (orig == null)
orig = items;
if (constraint != null) {
if (orig != null && orig.size() > 0) {
for (final station g : orig) {
if (g.getName().toLowerCase()
.contains(constraint.toString()))
results.add(g);
}
}
oReturn.values = results;
}
return oReturn;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
items = (ArrayList<station>) results.values;
notifyDataSetChanged();
}
};
}
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
notifyChanged = true;
}Stack Overflow用户
发布于 2015-12-31 06:30:08
对于那些不需要Filterable接口的人，有一个简单得多的解决方案。在其他解决方案失败的情况下，这也可以正确地处理notifyDataSetChanged()。请注意，您需要向BaseAdapter添加一个getArray()函数，该函数只返回传递给构造函数的数组对象。
public abstract class BaseFilterAdapter<T> extends BaseAdapter<T> {
private List<T> original;
private String lastFilter;
public BaseFilterAdapter(Context context, List<T> array) {
super(context, new LinkedList<T>());
original = array;
filter("");
}
protected abstract Boolean predicate(T element, String filter);
public void filter(String filter) {
lastFilter = filter;
super.getArray().clear();
for (T element : original)
if (predicate(element, filter))
super.getArray().add(element);
super.notifyDataSetChanged();
}
@Override
public List<T> getArray() {
return original;
}
@Override
public void notifyDataSetChanged() {
filter(lastFilter);
}
}Stack Overflow用户
发布于 2016-09-05 10:35:56
在基类上添加toString重写。例如
@Override
public String toString() {
return this.name;
}上面使你的列表成为字符串列表。因此，您可以使用：
your_edit_text.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
YourActivity.this.YourAdapter.getFilter().filter(arg0);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
}
@Override
public void afterTextChanged(Editable arg0) {
}
});页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/5780289
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