Listview with filter

Question

i am trying to filter the listview using edit text at the top but it providing null pointer exception in the adapter2.filter(text) of add text changed listener . please provide me some suggestion`

Here is my edit text`

friendsList.setAdapter(new FriendListAdapter(this));

    search.addTextChangedListener(new TextWatcher() {

        @Override
        public void afterTextChanged(Editable arg0) {
            // TODO Auto-generated method stub

            String text = search.getText().toString().toLowerCase(Locale.getDefault());
            System.out.println("test=="+text);
            adapter2.filter(text);
        }

        @Override
        public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
            // TODO Auto-generated method stub
            //adapter.getFilter().filter(arg0.toString());

        }

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

        }


    });

Here is my adapter

public class FriendListAdapter extends BaseAdapter {

    private LayoutInflater mInflater;

    FriendsList friendsList;
    Context context;
    ViewHolder holder;
    private boolean userSelected = false;
    private RadioButton mCurrentlyCheckedRB;

    private int mResourceId = 0;
    private LayoutInflater mLayoutInflater; 
    private RadioButton mSelectedRB;
    private int mSelectedPosition = -1;

    public FriendListAdapter(FriendsList friendsList) {
        this.friendsList = friendsList;
        if (Utility.model == null) {
            Utility.model = new FriendsGetProfilePics();
        }
        Utility.model.setListener(this);
        mInflater = LayoutInflater.from(friendsList.getBaseContext());
    }

    @Override
    public int getCount() {
        return jsonArray.length();
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int arg0) {
        return 0;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup viewgroup) {
        JSONObject jsonObject = null;
        Model model = (Model) getItem(position);
        try {
            jsonObject = jsonArray.getJSONObject(position);
        } catch (JSONException e1) {
            e1.printStackTrace();
        }
        View hView = convertView;
        if (convertView == null) {
            hView = mInflater.inflate(R.layout.friend_item, null);
            ViewHolder holder = new ViewHolder();
            holder.profile_pic = (ImageView) hView
                    .findViewById(R.id.profile_pic);
            holder.name = (TextView) hView.findViewById(R.id.name);
            holder.info = (TextView) hView.findViewById(R.id.info);
            holder.radiobt = (RadioButton) hView.findViewById(R.id.radio);
            hView.setTag(holder);
        }
        ViewHolder holder = (ViewHolder) hView.getTag();
        if (position == getCount() - 1 && userSelected == false) {
            holder.radiobt.setChecked(true);
            mCurrentlyCheckedRB = holder.radiobt;
        } else {
            holder.radiobt.setChecked(false);
        }

        holder.radiobt.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub



                if((position != mSelectedPosition && mSelectedRB != null)){
                    mSelectedRB.setChecked(false);
                }

                mSelectedPosition = position;
                mSelectedRB = (RadioButton)v;


                System.out.println("onItemClick ");
                try {

                    if (graph_or_fql.equals("graph")) {

                        System.out.println("in if loop ");
                        friendId = jsonArray.getJSONObject(position).getLong("id");
                        image = jsonArray.getJSONObject(position).getString("picture");
                        // sb.append(friendId).append(",");
                        freind_id = String.valueOf(friendId);

                    } else {

                        System.out.println("in else loop ");
                        friendId = jsonArray.getJSONObject(position).getLong("uid");
                        image = jsonArray.getJSONObject(position).getString(
                                "pic_square");
                        // sb.append(friendId).append(",");
                        freind_id = String.valueOf(friendId);
                    }
                    check = true;
                    name = jsonArray.getJSONObject(position).getString("name");

                    Toast.makeText(getApplicationContext(), "You Selected : " + name,
                            Toast.LENGTH_SHORT).show();

                } catch (JSONException e) {
                    e.printStackTrace();
                    e.getMessage();
                }



            }
        });


        if(mSelectedPosition != position){
            holder.radiobt.setChecked(false);
        }else{
            holder.radiobt.setChecked(true);
            if(mSelectedRB != null && holder.radiobt != mSelectedRB){
                mSelectedRB = holder.radiobt;
            }
        }

    try {
            if (graph_or_fql.equals("graph")) {
                holder.profile_pic.setImageBitmap(Utility.model.getImage(
                        jsonObject.getString("id"),
                        jsonObject.getString("picture")));
            } else {
                holder.profile_pic.setImageBitmap(Utility.model.getImage(
                        jsonObject.getString("uid"),
                        jsonObject.getString("pic_square")));
            }
        } catch (JSONException e) {
            holder.name.setText("");
        }
        try {
            holder.name.setText(jsonObject.getString("name"));
        } catch (JSONException e) {
            holder.name.setText("");
        }
        try {
            if (graph_or_fql.equals("graph")) {
                holder.info.setText(jsonObject.getJSONObject("location")
                        .getString("name"));
            } else {
                JSONObject location = jsonObject
                        .getJSONObject("current_location");
                holder.info.setText(location.getString("city") + ", "
                        + location.getString("state"));
            }

        } catch (JSONException e) {
            holder.info.setText("");
        }
        return hView;

    }


    // Filter Class
    public void filter(String charText) {
        System.out.println("in adapter filter");
        charText = charText.toLowerCase(Locale.getDefault());
        System.out.println("1");
        rowitems.clear();
        System.out.println("2");

        if (charText.length() == 0) {
            System.out.println("3");
            rowitems.addAll(listData);
        } else {
            for (Model wp : listData) {
                if (wp.getName().toLowerCase(Locale.getDefault())
                        .contains(charText)) {
                    rowitems.add(wp);
                }
            }
        }
        notifyDataSetChanged();
    }


    private class ViewHolder {
        ImageView profile_pic;
        TextView name;
        TextView info;
        // CheckBox check;
        RadioButton radiobt;
    }       
}

Here is my main activity

public class FriendsList extends Activity implements OnItemClickListener{

private Handler mHandler;
public static Long friendId;
public static String name = "";
protected ListView friendsList;
protected static JSONArray jsonArray;
protected String graph_or_fql;
public Button bt;
public static String image = "0";
public boolean check = false;
public static String freind_id = "";
public boolean select = false;
public RadioButton radiobtn;    

public ListView friendList; 
private List<Model> rowitems=null;
ArrayList<Model> listData;
    AdapterList adapter;
    EditText search;

FriendListAdapter adapter2;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    mHandler = new Handler();
    setContentView(R.layout.friends_list);
    //radioSexGroup = (RadioGroup) findViewById(R.id.radioSex);
    bt = (Button) findViewById(R.id.com_facebook_picker_done_button);
    radiobtn = (RadioButton) findViewById(R.id.radio);

    search=(EditText) findViewById(R.id.editText100);

    Bundle extras = getIntent().getExtras();
    String apiResponse = extras.getString("API_RESPONSE");
    graph_or_fql = extras.getString("METHOD");
    try {
        if (graph_or_fql.equals("graph")) {
            jsonArray = new JSONObject(apiResponse).getJSONArray("data");
        } else {
            jsonArray = new JSONArray(apiResponse);
        }
    } catch (JSONException e) {
        e.printStackTrace();
        e.getMessage();
        return;
    }
    friendsList = (ListView) findViewById(R.id.friends_list);

//  friendsList.setAdapter(new FriendListAdapter(this));

    adapter2=new FriendListAdapter(this);
    friendsList.setAdapter(adapter2);

    friendsList.setOnItemClickListener(this);

    search.addTextChangedListener(new TextWatcher() {

        @Override
        public void afterTextChanged(Editable arg0) {
            // TODO Auto-generated method stub

        }

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

              adapter2.getFilter().filter(arg0.toString());
        }

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

        }
    });

i am passing the facebook friend list to the listview.please provide some suggestion Thanks in advance

Answer 1

For filter the listview using edit text at the top . I used this code. Make one list called searchResults than in onTextChanged method of edittext simply do this-

String searchString = `your edittext object`.getText().toString();
int textLength = searchString.length();
searchResults.clear();
for (int i = 0; i < `your main list of items`.size(); i++) {
String name = `your main list of items`.get(i).get("`your key`").toString();
System.out.println(" name " + name);
if (textLength <= title.length()) {
// compare the String in EditText with Names in the
// ArrayList
if (searchString.equalsIgnoreCase(name.substring(0, textLength))) {
    searchResults.add(`your main list of items`.get(i));
    System.out.println("the array list is "+ `your main list of items`.get(i));
    mAdapter = new Adapter(this, searchResults);
    `your ListView object`.setAdapter(mAdapter);
    }
     }
  }
  if (searchResults.isEmpty()) {
  Toast toast = Toast.makeText(getApplicationContext(),"No Items Matched",Toast.LENGTH_SHORT);
  toast.show();
  mAdapter = new Adapter(this, searchResults);
    `your ListView object`.setAdapter(mAdapter);
 }
  mAdapter.notifyDataSetChanged();

and on setOnItemClickListener just check searchResults.isEmpty() if true than use your your main list of items and if false than use searchResults list. May be it will help you.try this.

Answer 2

Try this,

adapter2=new FriendListAdapter(this);
friendsList.setAdapter(adapter2);

Answer 3

change your filter with following code:

@Override
public Filter getFilter() {
    //Log.d("in filter", "yes");
    return new Filter() {
          @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                final FilterResults oReturn = new FilterResults();

and set your list in this function and after set your list :

    oReturn.values = YourList;

and finall

    return oReturn;

and in Your search.addTextChangedListener(new TextWatcher()) just in onTextChanged add following line:

    adapter2.getFilter().filter(s.toString());