フィルタリングされたデータをリストビューに表示

Question

フィルタリングされたリストをリストビューに表示しようとしているときに問題が発生しています。 フィルタリング後にデータを出力しますが、実際には正しいですが、ListViewに表示されません。間違っていますか？私は、問題を見つけて修正することができましたので、私のコードは

import android.app.Activity; 
import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.drawable.Icon; 
import android.media.Image; 
import android.util.Base64; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Filter; 
import android.widget.BaseAdapter; 
import android.widget.Filterable; 
import android.widget.ImageView; 
import android.widget.TextView; 

import java.io.UnsupportedEncodingException; 
import java.util.ArrayList; 
import java.util.HashMap; 

public class SchoolListAdapter extends BaseAdapter implements Filterable { 

private Activity activity; 
ArrayList<HashMap<String, String>> data; 
ArrayList<HashMap<String, String>> displayedData; 
private static LayoutInflater inflater=null; 

public SchoolListAdapter(Activity a, ArrayList<HashMap<String, String>> d) { 
    activity = a; 
    data=d; 
    displayedData = d; 
    inflater = LayoutInflater.from(a); 
} 

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

public Object getItem(int position) { 
    return position; 
} 

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

public View getView(int position, View convertView, ViewGroup parent) { 
    View vi=convertView; 
    if(convertView==null) { 
     vi = inflater.inflate(R.layout.school_details_list, null); 
    } 

    ImageView schoolLogo = (ImageView) vi.findViewById(R.id.schoolLogo); 
    TextView lblSchoolId = (TextView)vi.findViewById(R.id.lblSchoolId); 
    TextView lblSchoolName = (TextView)vi.findViewById(R.id.lblSchoolName); 

    HashMap<String, String> school = data.get(position); 
    // Setting all values in listview 
    lblSchoolId.setText(school.get("id")); 
    lblSchoolName.setText(school.get("name")); 
    String logo = school.get("logo"); 

    byte []img = Base64.decode(logo,Base64.DEFAULT); 
    Bitmap bmp = BitmapFactory.decodeByteArray(img, 0, img.length); 
    schoolLogo.setImageBitmap(bmp); 

    return vi; 
} 

@Override 
public Filter getFilter() { 
    Filter filter = new Filter() { 

     @Override 
     protected void publishResults(CharSequence constraint,FilterResults results) { 
      if(results.count == 0){ 
       notifyDataSetInvalidated(); 
      }else{ 
       displayedData = (ArrayList<HashMap<String, String>>) results.values; // has the filtered values 
       notifyDataSetChanged(); // notifies the data with new filtered values 
      } 
     } 

     @Override 
     protected FilterResults performFiltering(CharSequence constraint) { 
      FilterResults results = new FilterResults();  // Holds the results of a filtering operation in values 
      ArrayList<HashMap<String, String>> FilteredArrList = new ArrayList(); 

      if (data == null) { 
       data = new ArrayList(displayedData); // saves the original data in data 
      } 

      /******** 
      * 
      * If constraint(CharSequence that is received) is null returns the data(Original) values 
      * else does the Filtering and returns FilteredArrList(Filtered) 
      * 
      ********/ 
      if (constraint == null || constraint.length() == 0) { 

       // set the Original result to return 
       results.count = data.size(); 
       results.values = data; 
      } else { 
       constraint = constraint.toString().toUpperCase(); 
       HashMap <String, String>schools = new HashMap(); 
       for (int i = 0; i < data.size(); i++) { 
        String dat = data.get(i).get("name"); 
        if(dat.toString().matches(".*"+constraint+".*")){ 
         schools.put("id",data.get(i).get("id")); 
         schools.put("name",data.get(i).get("name")); 
         schools.put("logo",data.get(i).get("logo")); 
         FilteredArrList.add(schools); 
        } 
       } 
       // set the Filtered result to return 
       results.count = FilteredArrList.size(); 
       results.values = FilteredArrList; 

      } 
      return results; 
     } 
    }; 
    return filter; 
} 
} 

import android.app.Activity; 
import android.app.ListActivity; 
import android.app.ProgressDialog; 
import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.text.Editable; 
import android.text.TextWatcher; 
import android.util.Log; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.EditText; 
import android.widget.ListView; 
import android.widget.TextView; 

import org.json.JSONArray; 
import org.json.JSONObject; 

import java.util.ArrayList; 
import java.util.HashMap; 

public class SelectSchoolActivity extends ListActivity implements AdapterView.OnItemClickListener { 

private ProgressDialog pDialog; 
private ListView lv; 
private SharedPreferences sharedPreferences; 
public static String SCHOOLING_PREFERENCES = "SCHOOL_PREF"; 
private ArrayList<HashMap<String, String>> schoolList; 
private EditText txtSearch; 
private SchoolListAdapter adapter; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_select_school); 
    sharedPreferences = getSharedPreferences(SCHOOLING_PREFERENCES, Context.MODE_PRIVATE); 
    txtSearch = (EditText)findViewById(R.id.txtSearch); 
    schoolList = new ArrayList(); 
    if(sharedPreferences.contains("school")){ 
     Intent intent = new Intent(SelectSchoolActivity.this, LoginActivity.class); 
     startActivity(intent); 
     finish(); 
    }else{ 
     new GetSchoolList(SelectSchoolActivity.this).execute(); 
     lv = getListView(); 
     lv.setOnItemClickListener(this); 


     // Add Text Change Listener to EditText 
     txtSearch.addTextChangedListener(new TextWatcher() { 

      @Override 
      public void onTextChanged(CharSequence s, int start, int before, int count) { 
       // Call back the Adapter with current character to Filter 
       adapter.getFilter().filter(s.toString()); 
      } 

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

      @Override 
      public void afterTextChanged(Editable s) { 
      } 
     }); 
    } 
} 


public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
    String school = ((TextView)view.findViewById(R.id.lblSchoolId)).getText().toString(); 
    SharedPreferences.Editor editor = sharedPreferences.edit(); 
    editor.putString("school", school); 
    editor.commit(); 
    Intent intent = new Intent(SelectSchoolActivity.this, LoginActivity.class); 
    startActivity(intent); 
    finish(); 
} 

private class GetSchoolList extends AsyncTask<Void, Void, Void> { 

    private Activity context; 

    public GetSchoolList(Activity context){ 
     this.context = context; 
    } 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     // Showing progress dialog 
     pDialog = new ProgressDialog(context); 
     pDialog.setMessage("Please wait..."); 
     pDialog.setCancelable(false); 
     pDialog.show(); 
    } 

    @Override 
    protected Void doInBackground(Void... arg0) { 

     // Creating service handler class instance 
     ServiceHandler sh = new ServiceHandler(); 
     String url = "http://192.168.34.1:8085/SchoolWebService/rest/Student/school_list"; 
     // Making a request to url and getting response 
     String details = sh.makeServiceCall(url, ServiceHandler.GET); 

     if (details != null) { 
      try { 
       JSONArray results = new JSONArray(details); 
       for(int i = 0; i<results.length(); i++) { 
        JSONObject c = results.getJSONObject(i); 
        String id = c.getString("id"); 
        String name = c.getString("name"); 
        String logo = c.getString("logo"); 

        // tmp hashmap for single feeDetails 
        HashMap <String, String>school = new HashMap(); 
        school.put("id", id); 
        school.put("name", name); 
        school.put("logo", logo); 

        schoolList.add(school); 
       } 
      } catch (Exception e) { 
       Log.e("Exception", Log.getStackTraceString(e)); 
      } 
     } else { 
      //snackbar.setText("Connection Failed!").show(); 
     } 

     return null; 
    } 

    @Override 
    protected void onPostExecute(Void result) { 
     super.onPostExecute(result); 
     // Dismiss the progress dialog 
     if (pDialog.isShowing()) { 
      pDialog.dismiss(); 
     } 

     adapter = new SchoolListAdapter(context, schoolList); 
     setListAdapter(adapter); 
    } 
} 

}

Answer 1

@medhdjを下回っている私のコードでは、エラーを指摘しました。 彼のコメントを参照してください