Question

I have a BaseAdapter and want use filter it. Its filled with object (1). I want filter using the field “nome”. Its give me error when i try use the filter. check the code:

Object Contato

public class Contato {
    public static final String CONTATO_NOME = "contato_nome";
    public static final String CONTATO_ORG = "contato_org";
    public static final String CONTATO_ID = "contato_id";

    public static String[] colunas = {"_id", Contato.CONTATO_NOME, Contato.CONTATO_ORG, Contato.CONTATO_ID};

    public long _id;
    public String nome;
    public String org;
    public String id;

    public Contato () {
    }

    public Contato (String nome, String org, String id) {
        this.nome = nome;
        this.org = org;
        this.id = id;
    }

    public Contato (long _id, String nome, String org, String id) {
        this.id = id;
        this.nome = nome;
        this.org = org;
        this.id = id;
    }

    public static String[] getColunas() {
        return colunas;
    }
    public static void setColunas(String[] colunas) {
        Contato.colunas = colunas;
    }

    public long get_Id() {
        return _id;
    }
    public void set_Id(long _id) {
        this._id = _id;
    }

    public String getNome() {
        return nome;
    }
    public void setNome(String nome) {
        this.nome = nome;
    }

    public String getOrg() {
        return org;
    }
    public void setOrg(String org) {
        this.org = org;
    }

    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
}

baseadapter

public class ContatoListAdapter extends BaseAdapter implements Filterable {
    private Context context;
    private List<Contato> lista;
    private TextView nome;
    private TextView org;
    private LayoutInflater inflater;

    public ContatoListAdapter(Context contexto, List<Contato> lista) {
        this.context = contexto;
        this.lista = lista;
    }

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

    public Object getItem(int position) {
        return lista.get(position);
    }

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

    public View getView(int position, View convertView, ViewGroup parent) {
        // Recupera a atividade da posição atual
        Contato c = lista.get(position);

        if (position == 0) {

            inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View view = inflater.inflate(R.layout.contato_linha_lista, null);
            // Atualiza o valor do TextView
            nome = (TextView) view.findViewById(R.id.txtContatoListaNome);
            nome.setText(c.nome);

            org = (TextView) view.findViewById(R.id.txtContatoListaOrganizacao);
            org.setText(c.org);

            return view;

        } else {

            inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View view = inflater.inflate(R.layout.contato_linha_lista, null);

            // Atualiza o valor do TextView
            nome = (TextView) view.findViewById(R.id.txtContatoListaNome);
            nome.setText(c.nome);

            org = (TextView) view.findViewById(R.id.txtContatoListaOrganizacao);
            org.setText(c.org);

            return view;

        }
    }

    public Filter getFilter() {
        return new Filter() {

            @SuppressWarnings("unchecked")
            @Override
            protected void publishResults(CharSequence constraint,
                    FilterResults results) {
                lista = (List<Contato>) results.values;
                ContatoListAdapter.this.notifyDataSetChanged();
            }

            @Override
            protected FilterResults performFiltering(CharSequence constraint) {

                List<Contato> filteredResults = getFilteredResults(constraint);

                FilterResults results = new FilterResults();

                results.values = filteredResults;

                return results;
            }
        };
    }

    protected List<Contato> getFilteredResults(CharSequence constraint) {
        // TODO Auto-generated method stub
        return null;
    }

filter’s call

Util.etxtTelaContatosListaBuscar
                .addTextChangedListener(new TextWatcher() {
                    public void afterTextChanged(Editable s) {
                    }

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

                    public void onTextChanged(CharSequence s, int start,
                            int before, int count) {
                        if (Util.adapter != null)
                            Util.adapter.getFilter().filter(s);
                    }
                });

EDIT:

errors I got after type something in search field:

Shutting down VM

thread exiting with uncaught exception (group=0x4001d7d0)

FATAL EXCEPTION: main

java.lang.NullPointerException

at
com.datalabrasil.dtldiscover.ContatoListAdapter.getCount(ContatoListAdapter.java:28)

at
android.widget.AdapterView$AdapterDataSetObserver.onChanged(AdapterView.java:778)

at
android.database.DataSetObservable.notifyChanged(DataSetObservable.java:31)

at
android.widget.BaseAdapter.notifyDataSetChanged(BaseAdapter.java:50)

at
com.datalabrasil.dtldiscover.ContatoListAdapter$1.publishResults(ContatoListAdapter.java:85)

at android.widget.Filter$ResultsHandler.handleMessage(Filter.java:282)

at android.os.Handler.dispatchMessage(Handler.java:99)

at android.os.Looper.loop(Looper.java:123)

at android.app.ActivityThread.main(ActivityThread.java:4627)

at java.lang.reflect.Method.invokeNative(Native Method)

at java.lang.reflect.Method.invoke(Method.java:521)

at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:871)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629)

at dalvik.system.NativeStart.main(Native Method)

Answer 1

protected List<Contato> getFilteredResults(CharSequence constraint) {
        // TODO Auto-generated method stub
        return null;
    }

i think you have to fill this method’s body, returning proper result 🙂

edit: try this:

protected List<Contato> getFilteredResults(CharSequence constraint) {
    ArrayList<Contacto> filteredList = new ArrayList<Contato>(); 
    for (Contato c:lista) { 
        if (c.nome.trim().toLowerCase().startsWith(constraint.toString().trim().toLowerCase())) { // you can also use contains instead of startsWith...whatever you need 
            filteredList.add(c); 
        } 
    } 
    return filteredList;
    }

edit #2: in the for cycle would be maybe better to use something like getAllContato() or something like that, instead of lista, because after filtering, filtered results rewrite variable lista and that means that with every filtering, you will have less and less items in your list…in that case you are filtering filtered items and so on…i hope you get what i am trying to say. 🙂