android - 使用 EditText 搜索 ListView

Question

我正在尝试通过使用 TextView 的 ListView 进行搜索，在编写代码后，它正在注销我所做的事情，但没有过滤我希望它过滤的列表。这是我的代码:

public class LabDetailActivity extends ActionBarActivity {

    private LabAdapter labListAdapter;
    private List<LabItem> labItem;
    private TextView searchText;
    private SearchView mSearchView;
    private ListView list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.assigned_lab_fragments);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setTitle("Labs");

        searchText = (TextView) findViewById(R.id.labText);

        list = (ListView) findViewById(android.R.id.list);
        labItem = new ArrayList<LabItem>();
        labListAdapter = new LabAdapter(this, labItem);
        list.setAdapter(labListAdapter);
        list.setTextFilterEnabled(true);
        list.setOnItemClickListener(new ListItemClickListener());
        searchText.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) {
            /*labListAdapter.getFilter().filter(charSequence.toString());
            list.setAdapter(labListAdapter);*/
        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) {
            int textLength = charSequence.length();
            List<LabItem> labItemss = new ArrayList<LabItem>();
            for (LabItem ll : labItem){
                if(textLength <= ll.getName().length()){
                    if (ll.getName().toLowerCase().contains(charSequence.toString().toLowerCase())){
                        labItemss.add(ll);
                    }
                }
            }
            Log.d("SIZE OF SEARCH", String.valueOf(labItemss.size()));
            labListAdapter = new LabAdapter(LabDetailActivity.this, labItemss);
            list.setAdapter(labListAdapter);
        }

        @Override
        public void afterTextChanged(Editable editable) {
            /*Log.d("NEW TAGS", "*** Search value changed: " + editable.toString());
            if (editable.toString().length() >= 3)
                labListAdapter.getFilter().filter(editable.toString());*/
            //labListAdapter.getFilter().filter(editable.toString());
            //labListAdapter.notifyDataSetChanged();
        }
    });
    }

    private class ListItemClickListener implements ListView.OnItemClickListener{

        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

        }
    }

    private void RetrieveData(){
        Uri uri2 = Uri.parse("content://" + getString(R.string.LEONE_AUTHORITY) + "/olabs");
        Log.d("URL PRINT", uri2.toString());
        final Cursor cursor = getContentResolver().query(uri2, null, null, null, "_id");
        Log.d("CURSOR DATA:", cursor.toString());
        JSONArray array = new JSONArray();
        if (cursor != null && cursor.getCount() > 0) {
            while (cursor.moveToNext()) {
                JSONObject object = new JSONObject();
                try {
                    object.put("lab_number", cursor.getString(cursor.getColumnIndex("lab_case_number")));
                    object.put("lab_name", cursor.getString(cursor.getColumnIndex("lab_case_name")));
                    array.put(object);
                    Log.d("ARRAY", String.valueOf(array.length()));
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
            parseJsonLabs(array);
            cursor.close();
        }
    }

    private void parseJsonLabs(JSONArray array){

        Log.d("CASESARRAY", array.toString());
        try {
            labItem.clear();
            for (int i = 0; i < array.length(); i++) {
                JSONObject cases = (JSONObject) array.get(i);
                LabItem items = new LabItem();

                items.setName(cases.getString("lab_number"));
                items.setCase(cases.getString("lab_name"));
                labItem.add(items);
            }
            labListAdapter.notifyDataSetChanged();
        } catch (JSONException e) {
            // TODO: handle exception
            Log.e("ARRAYTEST", "ERROR:", e);
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        RetrieveData();
    }
}

那么，Adapter代码就在这里适配器

public class LabAdapter extends BaseAdapter implements Filterable{

    private Activity activity;
    private LayoutInflater inflater;
    private List<LabItem> labItem;
    private TextView labName, labCase;

    public LabAdapter(Activity activity, List<LabItem> labItem){
        this.activity = activity;
        this.labItem = labItem;
    }

    @Override
    public int getCount() {
        return labItem.size();
    }

    @Override
    public Object getItem(int position) {
        return labItem.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup viewGroup) {
        if (inflater == null)
            inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        if (convertView == null)
            convertView = inflater.inflate(R.layout.custom_lab_activity_list, null);

        labName = (TextView) convertView.findViewById(R.id.custom_lab_name);
        labCase = (TextView) convertView.findViewById(R.id.custom_lab_case);

        LabItem labs = labItem.get(position);
        labName.setText(labs.getName());
        labCase.setText(labs.getCase());
        return convertView;
    }

    @Override
    public Filter getFilter() {
        return new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence charSequence) {
                Log.d("SEARCHTEXT2", "**** PERFORM FILTERING for: " + charSequence);
                charSequence = charSequence.toString().toLowerCase();
                FilterResults filts = new FilterResults();
                if (charSequence == null || charSequence.length() == 0){
                    filts.values = labItem;
                    filts.count = labItem.size();
                } else {
                    // We perform filtering operation
                    List<LabItem> labrs = new ArrayList<LabItem>();
                    for (LabItem l : labrs){
                        if (l.getName().startsWith(charSequence.toString()) || l.getCase().startsWith(charSequence.toString()))
                            labItem.add(l);
                    }
                    filts.values = labItem;
                    filts.count = labItem.size();
                    //filts.count = labItem.size();
                }
                return filts;
            }

            @Override
            protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
                // Now we have to inform the adapter about the new list filtered
                Log.d("SEARCHTEXT1", "**** PUBLISHING RESULTS for: " + charSequence);
                if (filterResults.count == 0)
                    notifyDataSetInvalidated();
                else {
                    labItem = (List<LabItem>) filterResults.values;
                    notifyDataSetChanged();
                }
            }
        };
    }

    public void notifyDataSetChanged(){
        super.notifyDataSetChanged();
    }
}

Item类在这里元素等级

public class LabItem {

    String labCase, labName;

    public LabItem() {

    }

    public LabItem(String labCase, String labName){
        super();
        this.labCase = labCase;
        this.labName = labName;
    }

    public String getName(){
        return labName;
    }

    public void setName(String name){
        this.labName = name;
    }

    public String getCase(){
        return labCase;
    }

    public void setCase(String cases){
        this.labCase = cases;
    }
}

我不知道是我没有很好地更新 ListView 还是什么。当我输入 a 时，我会看到计数，但如果我添加另一个字母。 LIST 将消失。任何帮助，将不胜感激。提前致谢。

Answer 1

一些逻辑错误:我得到了这段代码在我这边工作

    public LabAdapter(Activity activity, List<LabItem> labItem){
        this.activity = activity;

        this.labItem = labItem;
    }

    @Override
    public int getCount() {
        return labItem.size();
    }

    @Override
    public LabItem getItem(int position) { //instead of Object make it Labitem
        return labItem.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup viewGroup) {
        if (inflater == null)
            inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        if (convertView == null)
            convertView = inflater.inflate(R.layout.activity_stack, null);

        labName = (TextView) convertView.findViewById(R.id.textView1);
        labCase = (TextView) convertView.findViewById(R.id.textView2);

        LabItem labs = labItem.get(position);
        labName.setText(labs.getName());
        labCase.setText(labs.getCase());
        return convertView;
    }

    @Override
    public Filter getFilter() {
        return new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence charSequence) {
                Log.d("SEARCHTEXT2", "**** PERFORM FILTERING for: " + charSequence);
                charSequence = charSequence.toString().toLowerCase();
                FilterResults filts = new FilterResults();
                if (charSequence == null || charSequence.length() == 0){
                    filts.values = labItem;
                    filts.count = labItem.size();
                } else {
                    // We perform filtering operation
                    List<LabItem> labrs = new ArrayList<LabItem>();
                    for (LabItem l : labItem){ //you are going to search in labItem that contains the data and not the empty list labrs
                        if (l.getName().startsWith(charSequence.toString()) || l.getCase().startsWith(charSequence.toString())){
                               Log.e("(l.getName().startsWith(charSequence.toString())","" + charSequence);
                               labrs.add(l); // add to the new list** 
                        }
                    }
                    filts.values = labrs; //set values to the new list**
                    filts.count = labrs.size(); 
                    //filts.count = labItem.size();
                }
                return filts;
            }

            @Override
            protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
                // Now we have to inform the adapter about the new list filtered
                Log.d("SEARCHTEXT1", "**** PUBLISHING RESULTS for: " + charSequence);
                List<LabItem> filtered = (List<LabItem>) filterResults.values;

                labItem = filtered; // set the new data as you want  with the new set you've received.**
                notifyDataSetChanged();

            }

        };
    }

public void notifyDataSetInvalidated()
{
    super.notifyDataSetInvalidated();
}

---

然后在您的 LabDetailActivity.class 中将其更改为

searchText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) {
                labListAdapter.getFilter().filter(charSequence.toString());
                Log.d("NEW TAGS", "*** Search value changed: " + labListAdapter.getCount());
                list.invalidate();
                labListAdapter.notifyDataSetChanged();
                list.setAdapter(labListAdapter);

            }

编辑:

P.S. This code is still not perfect as after clearing the text it doesn't sets the list back. I leave it to you. Hope this solves your problem you've been facing. Let me know if it works.