我想实现一个ListView这是使用自定义的对象适配器的过滤，但我无法找到任何有用的样本。所包含的code是非常简单，所以无糖记住我不能使用常规的ArrayAdapter。 我已经在ListView以上的EditText，当用户在窗口小部件的EditText中输入文本，我想通过写在的EditText文本过滤的ListView。 任何建议将是非常美联社preciated！

下面是活动类的代码片段：

 公共类management_objects延伸活动{

私有静态列表＆lt;使用者＆GT;在UserList;
私人EfficientAdapter适配器= NULL;
私人的ListView objectListView = NULL;
私人的EditText SearchText = NULL;

私有静态类EfficientAdapter扩展了BaseAdapter实现过滤的{
    私人LayoutInflater mInflater;

    公共EfficientAdapter（上下文的背景下）{
        mInflater = LayoutInflater.from（上下文）;
    }

    公众诠释getCount将（）{
        返回UserList.size（）;
    }

    公共对象的getItem（INT位置）{
        返回的位置;
    }

    众长getItemId（INT位置）{
        返回的位置;
    }

    公共查看getView（INT位置，查看convertView，ViewGroup中父）{
        ViewHolder持有人;
        如果（convertView == NULL）{
            convertView = mInflater.inflate（R.layout.imagelayout_2lines，NULL）;
            持有人=新ViewHolder（）;
            holder.text =（TextView中）convertView.findViewById（R.id.managementObjectText）;
            holder.subtext =（TextView中）convertView.findViewById（R.id.managementObjectSubText）;
            holder.icon =（ImageView的）convertView.findViewById（R.id.managementObjectIcon）;
            convertView.setTag（保持器）;
        }
        其他 {
            支架=（ViewHolder）convertView.getTag（）;
        }

        holder.text.setText（UserList.get（位置）.getFirstName（））;
        holder.subtext.setText（UserList.get（位置）.getLastName（））;
        holder.icon.setImageResource（R.drawable.user）;

        返回convertView;
    }

    静态类ViewHolder {
        TextView的文字;
        TextView的潜台词;
        ImageView的图标;
    }

    @覆盖
    公共过滤用getFilter（）{
        返回null;
    }
}

@覆盖
公共无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.adobjectlist）;
    捆绑额外= getIntent（）getExtras（）。

    SearchText =（EditText上）findViewById（R.id.SearchBox）;
    SearchText.addTextChangedListener（filterTextWatcher）;

    objectListView =（ListView控件）findViewById（R.id.ObjectList）;
    objectListView.setOnItemClickListener（ITEM_CLICK）;
    适配器=新EfficientAdapter（本）;
    计算机名= extras.getString（COMPUTER_NAME）;

    //从web服务的用户列表
    ShowUsers（）;
}
 

下面是用户等级：

 公共类用户{
  私人诠释用户ID;
  私人字符串名字;
  私人字符串姓氏;

    公众诠释getUserId（）{
        返回用户ID;
    }
    公共无效setUserId（INT用户ID）{
        this.UserId =用户ID;
    }
    公共字符串的getFirstName（）{
        返回名字;
    }
    公共无效setFirstName（字符串名字）{
        this.FirstName =名字;
    }
    公共字符串getLastName（）{
        返回姓氏;
    }
    公共无效setLastName（字符串名字）{
        this.LastName =姓氏;
    }
}
 

解决方案

您需要做几件事情：

1）在你的活动，注册您的EditText文本变化监听包含用户输入的值：

mSearchValue.addTextChangedListener（searchTextWatcher）;

2）创建searchTextWatcher，并将它做一些事情：

 私人TextWatcher searchTextWatcher =新TextWatcher（）{
    @覆盖
        公共无效onTextChanged（CharSequence中，诠释开始，诠释之前，诠释计数）{
            // 忽略
        }

        @覆盖
        公共无效beforeTextChanged（CharSequence中，诠释开始，诠释计数，之后INT）{
            // 忽略
        }

        @覆盖
        公共无效afterTextChanged（编辑S）{
            Log.d（Constants.TAG，***搜索值改为：+ s.toString（））;
            。adapter.getFilter（）滤波器（s.toString（））;
        }
    };
 

3）在自定义的适配器覆盖用getFilter（），并把它过滤结果，并通知列表视图的数据集已经改变了。

  @覆盖
    公共过滤用getFilter（）{
        返回新的过滤器（）{
            @燮pressWarnings（未登记）
            @覆盖
            保护无效publishResults（CharSequence的约束，FilterResults结果）{
                Log.d（Constants.TAG，****出版结果：+约束）;
                myData的=（名单＆LT; MyDataType＆GT;）results.values​​;
                MyCustomAdapter.this.notifyDataSetChanged（）;
            }

            @覆盖
            保护FilterResults performFiltering（CharSequence的约束）{
                Log.d（Constants.TAG，****执行过滤为：+约束）;
                名单＆LT; MyDataType＆GT; filteredResults = getFilteredResults（约束）;

                FilterResults结果=新FilterResults（）;
                results.values​​ = filteredResults;

                返回结果;
            }
        };
    }
 

I'm trying to implement filtering of a ListView which is uses a custom object adapter, but I can't find any useful samples. The included code is very simplified, so no- keep in mind I can't use an regular ArrayAdapter. I have a EditText above the ListView, and when the user enters text in the EditText widget I would like to filter the ListView by the text written in the EditText. Any suggestions would be much appreciated!

Here is the snippet from the activity class:

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();
}

Here is The User class:

 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;
    }
}

You need to do a few things:

1) In your activity, register for a text change listener on your EditText that contains the value the user enters:

mSearchValue.addTextChangedListener(searchTextWatcher);

2) Create your searchTextWatcher and have it do something:

private TextWatcher searchTextWatcher = new TextWatcher() {
    @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // ignore
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            // ignore
        }

        @Override
        public void afterTextChanged(Editable s) {
            Log.d(Constants.TAG, "*** Search value changed: " + s.toString());
            adapter.getFilter().filter(s.toString());
        }
    };

3) Override getFilter() in your custom adapter and have it filter the results and notify the listview that the dataset has changed.

    @Override
    public Filter getFilter() {
        return new Filter() {
            @SuppressWarnings("unchecked")
            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                Log.d(Constants.TAG, "**** PUBLISHING RESULTS for: " + constraint);
                myData = (List<MyDataType>) results.values;
                MyCustomAdapter.this.notifyDataSetChanged();
            }

            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                Log.d(Constants.TAG, "**** PERFORM FILTERING for: " + constraint);
                List<MyDataType> filteredResults = getFilteredResults(constraint);

                FilterResults results = new FilterResults();
                results.values = filteredResults;

                return results;
            }
        };
    }