gistfile1.java

package br.com.savemoney.mastercontas;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.SimpleAdapter;
import br.com.savemoney.database.DatabaseHelper;
import br.com.savemoney.database.DatabaseHelper.Devedores;

public class ListaDevedoresActivity extends ListActivity implements OnItemClickListener, OnClickListener {
	
	private DatabaseHelper helper;
	private List<Map<String, Object>> devedores;
	private AlertDialog alertDialog;
	private AlertDialog alertConfirma;
	private int devedorSelecionado;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		
		helper = new DatabaseHelper(this);
		
		String[] from = new String[] {Devedores.NOME, Devedores.EMAIL};
		int[] to = new int[] {R.id.txtNomeDevedor, R.id.txtEmailDevedor};
		
		SimpleAdapter adapter = new SimpleAdapter(this, listarDevedores(), R.layout.lista_devedores, from, to);
		
		setListAdapter(adapter);
		
		getListView().setOnItemClickListener(this);
		
		this.alertDialog = criaAlertdialog();
		this.alertConfirma = criaConfirmacaoDialog();
	}
	
	private List<Map<String, Object>> listarDevedores() {
		
		SQLiteDatabase db = helper.getReadableDatabase();
		Cursor cursor = db.rawQuery("SELECT nome, email FROM devedor;", null);
		cursor.moveToFirst();
		
		devedores = new ArrayList<Map<String,Object>>();
		
		for (int i = 0; i < cursor.getCount(); i++) {
			Map<String, Object> devedor = new HashMap<String, Object>();
			
			String nome = cursor.getString(0);
			String email = cursor.getString(1);
			
			devedor.put("nome", nome);
			devedor.put("email", email);
			devedores.add(devedor);
			
			cursor.moveToNext();
		}
		
		cursor.close();		
		
		return devedores;
	}

	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
		// TODO Auto-generated method stub
		//Guardo a posição do item na lista.
		this.devedorSelecionado = position;
		alertDialog.show();
		//Testa se realmente capturou o id da posição do item.
		Toast.makeText(this, "Devedor selecionado: " + this.devedorSelecionado, Toast.LENGTH_LONG).show();
	}

	@Override
	public void onClick(DialogInterface dialog, int item) {
		Intent intent;
		String id = (String) devedores.get(devedorSelecionado).get("id");
		switch (item) {
		case 0:
			startActivity(new Intent(this, DevedorActivity.class));
			break;
		case 1:// Editar Devedor
			intent = new Intent(this, DevedorActivity.class);
			//Adicionando/Enviando o id via conteúdo extra para outra activity
			intent.putExtra("id", id);
			startActivity(intent);
			break;
		case 2:
			alertConfirma.show();
			break;
		case DialogInterface.BUTTON_POSITIVE:
			devedores.remove(devedorSelecionado);
			getListView().invalidateViews();
			break;
		case DialogInterface.BUTTON_NEGATIVE:
			alertConfirma.dismiss();
			break;

		default:
			break;
		}
	}
	
	private AlertDialog criaAlertdialog() {
		final CharSequence[] items = {
				getString(R.string.novo_devedor),
				getString(R.string.editar_devedor),
				getString(R.string.remover_devedor)
		};
		
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setTitle(R.string.acoes_devedor);
		builder.setItems(items, this);
		
		return builder.create();
	}
	
	private AlertDialog criaConfirmacaoDialog() {
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setMessage(R.string.confirma_exclusao_devedor);
		builder.setPositiveButton(getString(R.string.sim_exclusao_devedor), this);
		builder.setNegativeButton(getString(R.string.nao_exclusao_devedor), this);
		
		return builder.create();
	}
	
	
}