Desenvolvendo para Android- Lista e Adapters - Part 7

activity_segunda.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="maputo.gdg.listaeadapters.activity.Segunda">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/nome_escolhido"
        />

</RelativeLayout>

AdapterGetView.java

 @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        //define o layoutInflater para desenhar o layout de cada linha da lista
        LayoutInflater inflater = LayoutInflater.from(mContext);

        TextView textView=null;

        if(convertView==null)
        {
            //desenha a view da linha da lista passando o ficheiro de layout
            convertView = inflater.inflate(R.layout.linha_lista_layout,parent,false);

            //encontra o textView pelo seu Id
            textView = (TextView)convertView.findViewById(R.id.nome);
        }

        //faz o set do nome ao textview
        textView.setText(listaNomes[position]);

        //faz return da view para a linha da posicao
        return convertView;

    }

FragmentLista

package maputo.gdg.listaeadapters.fragments;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;

import maputo.gdg.listaeadapters.R;
import maputo.gdg.listaeadapters.adapters.ListaAdapter;

/**
 * Created by Mac on 2/25/2015.
 */
public class FragmentLista extends Fragment {

    private ListView mLista;

    private ListaAdapter adapter;

    private String[] listaNomes=
            {
                    "Dario ICS",
                    "Paulo HoneyComb",
                    "Mariano Froyo",
                    "Martin Jelly Bean",
                    "Edson Kit",
                    "Marry Kat",
                    "Paula LoliPop",
                    "John Doe",
                    "Chuck Norris"

            };

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        //Desenhamos uma nova view utilizando o inflater e passando o ficheiro de layout
        View view = inflater.inflate(R.layout.lista_fragment_layout,container,false);

        //mapeamos a instancia do listview ao widget no xml pelo seu id
        //lembre-se que se fizer (ListView) findViewById nao ira funcionar pois este metodo pertence a uma view
        mLista = (ListView)view.findViewById(R.id.listView);

        //definir o adapter para a lista

        mLista.setAdapter(adapter);

        //fazer o return da view

        return view;
    }

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

        adapter = new ListaAdapter(getActivity().getApplicationContext());

        adapter.setData(listaNomes);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
    }
}

FragmentLista-1st.java

package maputo.gdg.listaeadapters.fragments;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;

import maputo.gdg.listaeadapters.R;

/**
 * Created by Mac on 2/25/2015.
 */
public class FragmentLista extends Fragment {

    private ListView mLista;

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        //Desenhamos uma nova view utilizando o inflater e passando o ficheiro de layout
        View view = inflater.inflate(R.layout.lista_fragment_layout,container,false);

        //mapeamos a instancia do listview ao widget no xml pelo seu id
        //lembre-se que se fizer (ListView) findViewById nao ira funcionar pois este metodo pertence a uma view
        mLista = (ListView)view.findViewById(R.id.listView);

        //fazer o return da view

        return view;
    }

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

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
    }
}

FragmentLista-Final.java

package maputo.gdg.listaeadapters.fragments;

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;

import maputo.gdg.listaeadapters.R;
import maputo.gdg.listaeadapters.activity.Segunda;
import maputo.gdg.listaeadapters.adapters.ListaAdapter;

/**
 * Created by Mac on 2/25/2015.
 */
public class FragmentLista extends Fragment {

    private ListView mLista;

    private ListaAdapter adapter;

    private String[] listaNomes=
            {
                    "Dario ICS",
                    "Paulo HoneyComb",
                    "Mariano Froyo",
                    "Martin Jelly Bean",
                    "Edson Kit",
                    "Marry Kat",
                    "Paula LoliPop",
                    "John Doe",
                    "Chuck Norris"

            };
    private static final String CHAVE_NOME="nome";

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        //Desenhamos uma nova view utilizando o inflater e passando o ficheiro de layout
        View view = inflater.inflate(R.layout.lista_fragment_layout,container,false);

        //mapeamos a instancia do listview ao widget no xml pelo seu id
        //lembre-se que se fizer (ListView) findViewById nao ira funcionar pois este metodo pertence a uma view
        mLista = (ListView)view.findViewById(R.id.listView);

        //definir o adapter para a lista

        mLista.setAdapter(adapter);

        //definir o listener de clique a lista
        mLista.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                //pega o item do adapter na posicao passada
                String nome = (String) parent.getItemAtPosition(position);

                //cria intent e passa argumentos

                Intent i = new Intent(getActivity(), Segunda.class);

                i.putExtra(CHAVE_NOME,nome);

                startActivity(i);

            }
        });

        //fazer o return da view

        return view;
    }

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

        adapter = new ListaAdapter(getActivity().getApplicationContext());

        adapter.setData(listaNomes);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
    }
}

lista_fragment_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/listView" />
        
</LinearLayout>

ListaAdapter.java

package maputo.gdg.listaeadapters.adapters;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import maputo.gdg.listaeadapters.R;

/**
 * Created by Mac on 2/25/2015.
 */
public class ListaAdapter extends BaseAdapter {

    private Context mContext;

    private String[] listaNomes;


    public ListaAdapter(Context context)
    {
        mContext = context;
    }

    public void setData(String[] nomes)
    {
        listaNomes = nomes;
    }

    @Override
    public int getCount() {

        //fazemos o return do tamanho do nosso array de nomes
        return listaNomes.length;
    }

    @Override
    public Object getItem(int position) {

        //fazemos o return do nome em uma certa posicao da lista
        return listaNomes[position];
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        //define o layoutInflater para desenhar o layout de cada linha da lista
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());

        ViewHolder viewHolder = null;

        if(convertView==null)
        {
            //desenha a view da linha da lista passando o ficheiro de layout
            convertView = inflater.inflate(R.layout.linha_lista_layout,parent,false);

            viewHolder = new ViewHolder(convertView);

            //guardamos a referencia ao viewholder e nao temos de re-fazer o findViewById sempre
            convertView.setTag(viewHolder);
        }

        else
        {
            //pegamos o objecto do view holder
            viewHolder = (ViewHolder) convertView.getTag();
        }

        //faz o set do nome ao textview directament do view holder
        viewHolder.textView.setText(listaNomes[position]);

        //faz return da view para a linha da posicao
        return convertView;

    }

    //View Holder

    public class ViewHolder
    {
        public TextView textView;

        public ViewHolder(View view)
        {
            textView = (TextView) view.findViewById(R.id.nome);
        }
    }
}

Segunda.java

package maputo.gdg.listaeadapters.activity;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

import maputo.gdg.listaeadapters.R;

public class Segunda extends ActionBarActivity {

    private TextView textView;

    private static final String CHAVE_NOME="nome";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_segunda);

        textView = (TextView) findViewById(R.id.nome_escolhido);

        String nome = getIntent().getStringExtra(CHAVE_NOME);

        textView.setText("O nome escolhido foi: "+nome);

    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_segunda, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}