如何在android上創建listview過濾器？

Question

現在我想過濾器，但我真的不知道該怎麼做。我已經閱讀了一些教程並嘗試過，但仍然無法正常工作。請幫幫我！ 我想實現搜索功能。

代碼類apdater的：

public class PlaceAdapter extends BaseAdapter { 
private static ArrayList<Place> searchArrayList; 

private LayoutInflater mInflater; 

public PlaceAdapter(Context context, ArrayList<Place> results) { 
    searchArrayList = results; 
    mInflater = LayoutInflater.from(context); 
} 

public int getCount() { 
    return searchArrayList.size(); 
} 

public Object getItem(int position) { 
    return searchArrayList.get(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.row, null); 
     holder = new ViewHolder(); 
     holder.txtName = (TextView) convertView 
       .findViewById(R.id.label_place); 
     holder.txtAddress = (TextView) convertView 
       .findViewById(R.id.label_address); 
     holder.txtPhone = (TextView) convertView 
       .findViewById(R.id.label_distance); 

     convertView.setTag(holder); 
    } else { 
     holder = (ViewHolder) convertView.getTag(); 
    } 

    holder.txtName.setText(searchArrayList.get(position).getName()); 
    holder.txtAddress.setText(searchArrayList.get(position).getAddress()); 
    holder.txtPhone.setText(searchArrayList.get(position).getPhone()); 

    return convertView; 
} 

static class ViewHolder { 
    TextView txtName; 
    TextView txtAddress; 
    TextView txtPhone; 
} 

}類活動的

代碼

public class ServiceDetail extends Activity { 

private String DB_NAME = "Danang Travel.sqlite"; 
private PlaceAdapter adapter = null; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.servicedetail); 

    final ArrayList<Place> searchResults = GetSearchResults(); 

    final EditText filterEditText = (EditText) findViewById(R.id.filter_text); 
    final ListView lvPlace = (ListView) findViewById(R.id.listView1); 

    adapter = new PlaceAdapter(this, searchResults); 
    lvPlace.setAdapter(adapter); 
    lvPlace.setTextFilterEnabled(true); 

    // Set Focus***************************************** 
    lvPlace.setFocusableInTouchMode(true); 
    lvPlace.requestFocus(); 
    lvPlace.setOnFocusChangeListener(new OnFocusChangeListener() { 

     public void onFocusChange(View arg0, boolean arg1) { 
      // TODO Auto-generated method stub 
      // arg0.setBackgroundColor(arg1 ? Color.GRAY : Color.BLACK); 
      // lvPlace.setItemsCanFocus(true); 
     } 

    }); 

    // lvPlace.setClickable(true); 

    /******************************************************/ 
    // filter search 
    filterEditText.addTextChangedListener(new TextWatcher() { 

     public void onTextChanged(CharSequence cs, int arg1, int arg2, 
       int arg3) { 
      // When user changed the Text 
      //ServiceDetail.this.adapter.getFilter().filter(cs); 


     } 

     public void beforeTextChanged(CharSequence arg0, int arg1, 
       int arg2, int arg3) { 
      // TODO Auto-generated method stub 

     } 

     public void afterTextChanged(Editable arg0) { 
      // TODO Auto-generated method stub 
     } 
    }); 

    lvPlace.setOnItemClickListener(new OnItemClickListener() { 

     public void onItemClick(AdapterView<?> a, View v, int position, 
       long id) { 
      Object o = lvPlace.getItemAtPosition(position); 
      Place fullObject = (Place) o; 
      Toast toast = Toast.makeText(ServiceDetail.this, 
        "You have chosen: " + " " + fullObject.getName(), 
        Toast.LENGTH_SHORT); 
      toast.setGravity(Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0); 
      toast.show(); 
     } 
    }); 

} 

private ArrayList<Place> GetSearchResults() { 
    ArrayList<Place> results = new ArrayList<Place>(); 

    SQLiteDatabase DB = null; 
    Intent t = getIntent(); 
    Bundle extra = t.getExtras(); 
    String temp = extra.getString("k"); 
    try { 
     DB = this.openOrCreateDatabase(DB_NAME, MODE_PRIVATE, null); 

     Cursor c = DB.rawQuery(
       "SELECT Name,Address,TypeID FROM ServiceDetail Where SerID = '" 
         + temp + "' ORDER BY Name", null); 

     for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) { 
      Place k = new Place(); 
      // The Cursor is now set to the right position 
      String n = c.getString(c.getColumnIndex("Name")); 
      String a = c.getString(c.getColumnIndex("Address")); 
      String p = c.getString(c.getColumnIndex("TypeID")); 

      k.setName(n); 
      k.setAddress(a); 
      k.setPhone(p); 
      results.add(k); 
     } 

    } catch (SQLiteException se) { 
     Log.e(getClass().getSimpleName(), 
       "Could not create or Open the database"); 

    } finally { 
     DB.close(); 
    } 

    return results; 
} 

}

現在我想使過濾器，但我真的不知道怎麼做。我已經閱讀了一些教程並嘗試過，但仍然無法正常工作。請幫幫我！

Answer 1

在這裏你去:)

//Firstly here is your edittext on which you want to filter 
    EditTextfilterText = (EditText) findViewById(R.id.search_box); 
    filterText.clearComposingText(); 
    //Give the edittext the watcher as a text listener 
    filterText.addTextChangedListener(filterTextWatcher); 

//This will listen to key events such as you entering something inside the edit text 
private TextWatcher filterTextWatcher = new TextWatcher() { 


    public void afterTextChanged(Editable s) { 
     //Called after text changed 
    } 

    public void beforeTextChanged(CharSequence s, int start, int count, 
      int after) { 
    } 

    //Called each time you enter something into the edittext to filter your list or whatever 
    public void onTextChanged(CharSequence s, int start, int before, 
      int count) { 

       //Adapter creating code 
         //...... 
       //Filter calling code 
       adapter.getFilter().filter(s, new FilterListener() { 
       @Override 
       public void onFilterComplete(int count) { 
        //Just for fun do something here once filtering is done 
       } 
      }); 


     } 
    } 

}; 

現在您的自定義適配器裏面你將有以下：

---

public Filter getFilter() { 

     filter = new DrugListFilter(); 

    return filter; 
} 


private class MyFilterName extends Filter{ 

    @Override 
    protected FilterResults performFiltering(CharSequence constraint) { 
     FilterResults retval = new FilterResults(); 
        ArrayList<something> filt = new ArrayList<something>(); 

        //... Some code to filter your current Adapter data by the constaint 
        //Pass the results to retval 
        retval.count = filt.size(); 
        retval.values = filt; 
         } 
        //return retval 
       return retval; 
     } 

    //This is called once performFiltering is done 
    @Override 
    protected void publishResults(CharSequence constraint, FilterResults results) { 
     filteredItems.clear(); 
        //This is your array of filtered items 
     filteredItems.addAll((ArrayList)results.values); 
     doneFilter = true; 
        //Notify the dataset that it needs to update 
     notifyDataSetChanged(); 

    } 
}