Android - Agenda
De Aulas
Links relacionados: Programação para Dispositivos Móveis
Exemplo de Agenda Telefônica no Android
- Crie um novo projeto do tipo Empty Activity
- Crie uma nova Empty Activity chamada FormActivity;
Strings
Crie as seguintes strings:
1<resources>
2 <string name="app_name">AgendaTeste</string>
3 <string name="strLabelId">ID:</string>
4 <string name="strLabelNome">Name</string>
5 <string name="strLabelFone">Fone</string>
6 <string name="strButtonGravar">Save</string>
7 <string name="strButtonApagar">Del</string>
8 <string name="strButtonProcurar">Find</string>
9 <string name="strButtonLimpar">Clean</string>
10</resources>
Interface
Na interface, insira:
- 3 textView: ID, Nome e Fone
- 3 editText: ID, Nome e Fone
- 4 button: Gravar, Apagar, Procurar, Limpar
- 1 textView para os Contatos
1<?xml version="1.0" encoding="utf-8"?>
2<RelativeLayout
3 xmlns:android="http://schemas.android.com/apk/res/android"
4 xmlns:tools="http://schemas.android.com/tools"
5 android:layout_width="match_parent"
6 android:layout_height="match_parent"
7 tools:context="com.project.saulopz.agendateste20171.MainActivity" >
8
9 <TextView
10 android:id="@+id/lableID"
11 android:layout_width="wrap_content"
12 android:layout_height="wrap_content"
13 android:layout_alignParentLeft="true"
14 android:layout_alignParentTop="true"
15 android:layout_marginTop="16dp"
16 android:text="@string/strLabelId" />
17
18 <TextView
19 android:id="@+id/labelNome"
20 android:layout_width="wrap_content"
21 android:layout_height="wrap_content"
22 android:layout_alignLeft="@+id/lableID"
23 android:layout_below="@+id/lableID"
24 android:layout_marginTop="19dp"
25 android:text="@string/strLabelNome" />
26
27 <TextView
28 android:id="@+id/labelFone"
29 android:layout_width="wrap_content"
30 android:layout_height="wrap_content"
31 android:layout_alignLeft="@+id/labelNome"
32 android:layout_below="@+id/labelNome"
33 android:layout_marginTop="20dp"
34 android:text="@string/strLabelFone" />
35
36 <EditText
37 android:id="@+id/editTextID"
38 android:layout_width="wrap_content"
39 android:layout_height="wrap_content"
40 android:layout_alignBaseline="@+id/lableID"
41 android:layout_alignBottom="@+id/lableID"
42 android:layout_toRightOf="@+id/labelNome"
43 android:ems="10"
44 android:inputType="text" />
45
46 <EditText
47 android:id="@+id/editTextNome"
48 android:layout_width="wrap_content"
49 android:layout_height="wrap_content"
50 android:layout_alignBaseline="@+id/labelNome"
51 android:layout_alignBottom="@+id/labelNome"
52 android:layout_alignLeft="@+id/editTextID"
53 android:ems="10"
54 android:inputType="text" />
55
56 <EditText
57 android:id="@+id/editTextFone"
58 android:layout_width="wrap_content"
59 android:layout_height="wrap_content"
60 android:layout_alignBaseline="@+id/labelFone"
61 android:layout_alignBottom="@+id/labelFone"
62 android:layout_alignLeft="@+id/editTextNome"
63 android:ems="10"
64 android:inputType="text" />
65
66 <Button
67 android:id="@+id/buttonGravar"
68 android:layout_width="wrap_content"
69 android:layout_height="wrap_content"
70 android:layout_alignLeft="@+id/labelFone"
71 android:layout_below="@+id/editTextFone"
72 android:layout_marginTop="25dp"
73 android:text="@string/strButtonGravar" />
74
75 <Button
76 android:id="@+id/buttonApagar"
77 android:layout_width="wrap_content"
78 android:layout_height="wrap_content"
79 android:layout_alignBaseline="@+id/buttonGravar"
80 android:layout_alignBottom="@+id/buttonGravar"
81 android:layout_toRightOf="@+id/buttonGravar"
82 android:text="@string/strButtonApagar" />
83
84 <Button
85 android:id="@+id/buttonProcurar"
86 android:layout_width="wrap_content"
87 android:layout_height="wrap_content"
88 android:layout_alignBaseline="@+id/buttonApagar"
89 android:layout_alignBottom="@+id/buttonApagar"
90 android:layout_toRightOf="@+id/buttonApagar"
91 android:text="@string/strButtonProcurar" />
92
93 <Button
94 android:id="@+id/buttonLimpar"
95 android:layout_width="wrap_content"
96 android:layout_height="wrap_content"
97 android:layout_alignParentRight="true"
98 android:layout_alignTop="@+id/buttonProcurar"
99 android:text="@string/strButtonLimpar" />
100
101 <TextView
102 android:id="@+id/textViewAgenda"
103 android:layout_width="wrap_content"
104 android:layout_height="wrap_content"
105 android:layout_alignLeft="@+id/buttonGravar"
106 android:layout_centerVertical="true"
107 android:text="TextView" />
108
109</RelativeLayout>
Acesso aos Dados
DatabaseConnection
1package com.example.agenda;
2
3import android.content.Context;
4import android.database.sqlite.SQLiteDatabase;
5
6public class DatabaseConnection {
7 static private SQLiteDatabase connection = null;
8 static private String database = "";
9 static private Context context;
10 static private String table = "create table if not exists agenda ("
11 + "id integer not null primary key autoincrement,"
12 + "nome varchar(100), fone varchar(30))";
13
14 public static void setConfig(String db, Context c) {
15 database = db;
16 context = c;
17 }
18
19 public static SQLiteDatabase getConnection() {
20 if (connection == null) {
21 try {
22 connection = context.openOrCreateDatabase(database, 0, null);
23 connection.execSQL(table);
24 } catch (Exception e) {
25 e.printStackTrace();
26 }
27 }
28 return connection;
29 }
30}
Agenda
1package com.example.agenda;
2
3public class Agenda {
4 private int id;
5 private String nome;
6 private String fone;
7
8 public Agenda() {
9 setId(0);
10 setNome("");
11 setFone("");
12 }
13
14 public Agenda(int id, String nome, String fone) {
15 this.setId(id);
16 this.setNome(nome);
17 this.setFone(fone);
18 }
19
20 public int getId() {
21 return id;
22 }
23
24 public void setId(int id) {
25 this.id = id;
26 }
27
28 public String getNome() {
29 return nome;
30 }
31
32 public void setNome(String nome) {
33 this.nome = nome;
34 }
35
36 public String getFone() {
37 return fone;
38 }
39
40 public void setFone(String fone) {
41 this.fone = fone;
42 }
43
44 public String toString() {
45 return id + ": " + nome + " : " + fone;
46 }
47}
AgendaDAO
1package com.example.agenda;
2
3import java.util.ArrayList;
4import java.util.List;
5import android.database.Cursor;
6import android.database.sqlite.SQLiteDatabase;
7
8public class AgendaDAO {
9 private int posicao;
10 private List<Agenda> agendaList;
11
12 public AgendaDAO() {
13 posicao = 0;
14 agendaList = new ArrayList<Agenda>();
15 }
16
17 public void load() {
18 clear();
19 try {
20 SQLiteDatabase conn = DatabaseConnection.getConnection();
21 Cursor result = conn.query("agenda", null, null, null, null, null,
22 "nome");
23 while (result.moveToNext()) {
24 int id = result.getInt(result.getColumnIndex("id"));
25 String nome = result.getString(result.getColumnIndex("nome"));
26 String fone = result.getString(result
27 .getColumnIndex("fone"));
28 agendaList.add(new Agenda(id, nome, fone));
29 }
30 } catch (Exception e) {
31 e.printStackTrace();
32 }
33 }
34
35 public void inserir(Agenda a) {
36 try {
37 SQLiteDatabase conn = DatabaseConnection.getConnection();
38 String query = "insert into agenda (nome, fone) values ('"
39 + a.getNome() + "', '" + a.getFone() + "')";
40 conn.execSQL(query);
41 } catch (Exception e) {
42 e.printStackTrace();
43 }
44 }
45
46 public void alterar(Agenda a) {
47 try {
48 SQLiteDatabase conn = DatabaseConnection.getConnection();
49 String query = "update agenda set nome='" + a.getNome()
50 + "', fone='" + a.getFone() + "' where id='" + a.getId()
51 + "'";
52 conn.execSQL(query);
53 } catch (Exception e) {
54 e.printStackTrace();
55 }
56 }
57
58 public void deletar(Agenda a) {
59 try {
60 SQLiteDatabase conn = DatabaseConnection.getConnection();
61 String query = "delete from agenda where id='" + a.getId() + "'";
62 conn.execSQL(query);
63 } catch (Exception e) {
64 e.printStackTrace();
65 }
66 }
67
68 public Agenda getById(int id) {
69 for (int i = 0; i < agendaList.size(); i++) {
70 Agenda a = agendaList.get(i);
71 if (a.getId() == id) {
72 return a;
73 }
74 }
75 return null;
76 }
77
78 public Agenda next() {
79 Agenda a = null;
80 if (posicao < agendaList.size()) {
81 a = agendaList.get(posicao);
82 posicao++;
83 }
84 return a;
85 }
86
87 public void reset() {
88 posicao = 0;
89 }
90
91 public int size() {
92 return agendaList.size();
93 }
94
95 public void clear() {
96 posicao = 0;
97 agendaList.clear();
98 }
99}
Activity
1package com.example.agenda;
2
3import android.support.v7.app.AppCompatActivity;
4import android.os.Bundle;
5import android.app.AlertDialog.Builder;
6import android.view.View;
7import android.view.View.OnClickListener;
8import android.widget.EditText;
9import android.widget.TextView;
10
11public class MainActivity extends AppCompatActivity implements OnClickListener {
12 private EditText editTextId;
13 private EditText editTextNome;
14 private EditText editTextFone;
15 private TextView textViewAgenda;
16 private AgendaDAO agenda;
17
18 @Override
19 protected void onCreate(Bundle savedInstanceState) {
20 super.onCreate(savedInstanceState);
21 setContentView(R.layout.activity_main);
22
23 textViewAgenda = (TextView) findViewById(R.id.textViewAgenda);
24 editTextId = (EditText) findViewById(R.id.editTextID);
25 editTextNome = (EditText) findViewById(R.id.editTextNome);
26 editTextFone = (EditText) findViewById(R.id.editTextFone);
27
28 findViewById(R.id.buttonGravar).setOnClickListener(this);
29 findViewById(R.id.buttonApagar).setOnClickListener(this);
30 findViewById(R.id.buttonProcurar).setOnClickListener(this);
31 findViewById(R.id.buttonLimpar).setOnClickListener( this);
32
33 DatabaseConnection.setConfig("agendadb", getApplicationContext());
34 agenda = new AgendaDAO();
35 loadAgenda();
36 }
37
38 public void dialogo(String titulo, String conteudo) {
39 Builder builder = new Builder(MainActivity.this);
40 builder.setTitle(titulo);
41 builder.setMessage(conteudo);
42 builder.setNeutralButton("Ok", null);
43 builder.show();
44 }
45
46 public void limparCampos() {
47 editTextId.setText("");
48 editTextNome.setText("");
49 editTextFone.setText("");
50 }
51
52 public void loadAgenda() {
53 agenda.load();
54 Agenda a;
55 String str = "";
56 while ((a = agenda.next()) != null) {
57 str += a.toString() + "\n";
58 }
59 textViewAgenda.setText(str);
60 }
61
62 @Override
63 public void onClick(View v) {
64 switch (v.getId()) {
65 case R.id.buttonGravar:
66 try {
67 int id = 0;
68 if (editTextId.getText().toString().compareTo("") != 0) {
69 id = Integer.valueOf(editTextId.getText().toString());
70 }
71 Agenda a = agenda.getById(id);
72 if (a != null) {
73 a.setNome(editTextNome.getText().toString());
74 a.setFone(editTextFone.getText().toString());
75 agenda.alterar(a);
76 } else {
77 a = new Agenda(id, editTextNome.getText().toString(),
78 editTextFone.getText().toString());
79 agenda.inserir(a);
80 }
81 limparCampos();
82 loadAgenda();
83 } catch (Exception e) {
84 dialogo("ERRO", "O ID precisa ser inteiro");
85 }
86 break;
87 case R.id.buttonLimpar:
88 limparCampos();
89 break;
90 case R.id.buttonProcurar:
91 try {
92 int id = Integer.valueOf(editTextId.getText().toString());
93 Agenda a = agenda.getById(id);
94 if (a != null) {
95 editTextNome.setText(a.getNome());
96 editTextFone.setText(a.getFone());
97 } else {
98 dialogo("Not found", "Contato de codigo " + id
99 + " nao existe");
100 }
101 } catch (Exception e) {
102 dialogo("Erro", "Informe um id inteiro valido");
103 }
104 break;
105 case R.id.buttonApagar:
106 try {
107 int id = Integer.valueOf(editTextId.getText().toString());
108 Agenda a = agenda.getById(id);
109 if (a != null) {
110 agenda.deletar(a);
111 } else {
112 dialogo("Not found", "Contato de codigo " + id
113 + " nao existe");
114 }
115 } catch (Exception e) {
116 dialogo("Erro", "Informe um id inteiro valido");
117 }
118 limparCampos();
119 loadAgenda();
120 break;
121 }
122 }
123}
