Android - Lista de Contatos
De Aulas
Conteúdos relacionados: Dispositivos Móveis
- Criar uma Empty Activity;
string.xml
1<resources>
2 <string name="app_name">Contacts</string>
3 <string name="field_name">Name</string>
4 <string name="field_email">E-mail</string>
5 <string name="field_phone">Phone</string>
6 <string name="button_ok">OK</string>
7 <string name="button_clear">Clear</string>
8 <string name="error_noname">Please, enter with a name.</string>
9 <string name="error_title">Attention!</string>
10 <string name="alert_erase">You really want erase contact</string>
11</resources>
activity_main.xml
1<?xml version="1.0" encoding="utf-8"?>
2<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 xmlns:app="http://schemas.android.com/apk/res-auto"
4 xmlns:tools="http://schemas.android.com/tools"
5 android:layout_width="match_parent"
6 android:layout_height="match_parent"
7 tools:context=".MainActivity">
8
9 <EditText
10 android:id="@+id/editTextName"
11 android:layout_width="0dp"
12 android:layout_height="wrap_content"
13 android:layout_marginLeft="8dp"
14 android:layout_marginRight="8dp"
15 android:layout_marginTop="8dp"
16 android:ems="10"
17 android:hint="@string/field_name"
18 android:inputType="textPersonName"
19 app:layout_constraintLeft_toLeftOf="parent"
20 app:layout_constraintRight_toRightOf="parent"
21 app:layout_constraintTop_toTopOf="parent"
22 android:layout_marginStart="8dp"
23 android:layout_marginEnd="8dp"/>
24
25 <EditText
26 android:id="@+id/editTextPhone"
27 android:layout_width="0dp"
28 android:layout_height="wrap_content"
29 android:layout_marginLeft="8dp"
30 android:layout_marginRight="8dp"
31 android:layout_marginTop="8dp"
32 android:ems="10"
33 android:hint="@string/field_phone"
34 android:inputType="phone"
35 app:layout_constraintLeft_toLeftOf="parent"
36 app:layout_constraintRight_toRightOf="parent"
37 app:layout_constraintTop_toBottomOf="@+id/editTextName" />
38
39 <EditText
40 android:id="@+id/editTextEmail"
41 android:layout_width="0dp"
42 android:layout_height="wrap_content"
43 android:layout_marginLeft="8dp"
44 android:layout_marginRight="8dp"
45 android:layout_marginTop="8dp"
46 android:ems="10"
47 android:hint="@string/field_email"
48 android:inputType="textEmailAddress"
49 app:layout_constraintLeft_toLeftOf="parent"
50 app:layout_constraintRight_toRightOf="parent"
51 app:layout_constraintTop_toBottomOf="@+id/editTextPhone" />
52
53 <Button
54 android:id="@+id/buttonOk"
55 android:layout_width="wrap_content"
56 android:layout_height="wrap_content"
57 android:layout_marginLeft="8dp"
58 android:layout_marginTop="8dp"
59 android:text="@string/button_ok"
60 app:layout_constraintLeft_toLeftOf="parent"
61 app:layout_constraintTop_toBottomOf="@+id/editTextEmail"
62 android:layout_marginStart="8dp"
63 tools:ignore="RtlHardcoded" />
64
65 <Button
66 android:id="@+id/buttonClear"
67 android:layout_width="wrap_content"
68 android:layout_height="wrap_content"
69 android:layout_marginEnd="8dp"
70 android:layout_marginRight="8dp"
71 android:layout_marginTop="8dp"
72 android:text="@string/button_clear"
73 app:layout_constraintRight_toRightOf="parent"
74 app:layout_constraintTop_toBottomOf="@+id/editTextEmail"
75 tools:ignore="RtlHardcoded" />
76
77 <ListView
78 android:id="@+id/listContacts"
79 android:layout_width="0dp"
80 android:layout_height="0dp"
81 android:layout_marginBottom="8dp"
82 android:layout_marginEnd="8dp"
83 android:layout_marginLeft="8dp"
84 android:layout_marginRight="8dp"
85 android:layout_marginStart="8dp"
86 android:layout_marginTop="8dp"
87 app:layout_constraintBottom_toBottomOf="parent"
88 app:layout_constraintHorizontal_bias="0.0"
89 app:layout_constraintLeft_toLeftOf="parent"
90 app:layout_constraintRight_toRightOf="parent"
91 app:layout_constraintTop_toBottomOf="@+id/buttonOk"
92 app:layout_constraintVertical_bias="0.0"/>
93
94</android.support.constraint.ConstraintLayout>
Contact.java
1package com.saulopz.agenda;
2
3import android.provider.BaseColumns;
4
5class Contact implements BaseColumns {
6 static final String TABLE_NAME = "contact";
7 static final String COLUMN_NAME_NAME = "name";
8 static final String COLUMN_NAME_EMAIL = "email";
9 static final String COLUMN_NAME_PHONE = "phone";
10
11 private String name;
12 private String email;
13 private String phone;
14
15 Contact(String name, String email, String phone) {
16 setName(name);
17 setEmail(email);
18 setPhone(phone);
19 }
20
21 public String getName() {
22 return name;
23 }
24
25 public void setName(String name) {
26 this.name = name;
27 }
28
29 public String getEmail() {
30 return email;
31 }
32
33 public void setEmail(String email) {
34 this.email = email;
35 }
36
37 public String getPhone() {
38 return phone;
39 }
40
41 public void setPhone(String phone) {
42 this.phone = phone;
43 }
44}
DBHelper.java
1package com.saulopz.agenda;
2
3import android.content.Context;
4import android.database.sqlite.SQLiteDatabase;
5import android.database.sqlite.SQLiteOpenHelper;
6
7public class DBHelper extends SQLiteOpenHelper {
8 private static final int DATABASE_VERSION = 1;
9 private static final String DATABASE_NAME = "contacts.db";
10
11 DBHelper(Context context) {
12 super(context, DATABASE_NAME, null, DATABASE_VERSION);
13 }
14
15 @Override
16 public void onCreate(SQLiteDatabase db) {
17 String sql = "CREATE TABLE IF NOT EXISTS " + Contact.TABLE_NAME + " (" +
18 Contact.COLUMN_NAME_NAME + " VARCHAR(255) NOT NULL PRIMARY KEY, " +
19 Contact.COLUMN_NAME_EMAIL + " VARCHAR(255) NOT NULL, " +
20 Contact.COLUMN_NAME_PHONE + " VARCHAR(255) NOT NULL)";
21 db.execSQL(sql);
22 }
23
24 @Override
25 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
26 String sql = "DROP TABLE IF EXISTS " + Contact.TABLE_NAME;
27 db.execSQL(sql);
28 }
29}
ContactDAO.java
1package com.saulopz.agenda;
2
3import android.content.ContentValues;
4import android.content.Context;
5import android.database.Cursor;
6import android.database.sqlite.SQLiteDatabase;
7
8import java.util.ArrayList;
9import java.util.List;
10
11public class ContactDAO {
12 private DBHelper dbHelper;
13 private List<Contact> contacts;
14 public List<String> names;
15
16 ContactDAO(Context context) {
17 dbHelper = new DBHelper(context);
18 contacts = new ArrayList<>();
19 names = new ArrayList<>();
20 load();
21 }
22
23 private void load() {
24 names.clear();
25 contacts.clear();
26 SQLiteDatabase db = dbHelper.getReadableDatabase();
27 Cursor cursor = db.query(Contact.TABLE_NAME, null, null, null, null, null, null);
28 while (cursor.moveToNext()) {
29 String name = cursor.getString(cursor.getColumnIndex(Contact.COLUMN_NAME_NAME));
30 String email = cursor.getString(cursor.getColumnIndex(Contact.COLUMN_NAME_EMAIL));
31 String phone = cursor.getString(cursor.getColumnIndex(Contact.COLUMN_NAME_PHONE));
32 contacts.add(new Contact(name, email, phone));
33 names.add(name);
34 }
35 cursor.close();
36 }
37
38 public void insert(Contact contact) {
39 SQLiteDatabase db = dbHelper.getWritableDatabase();
40 ContentValues values = new ContentValues();
41 values.put(Contact.COLUMN_NAME_NAME, contact.getName());
42 values.put(Contact.COLUMN_NAME_EMAIL, contact.getEmail());
43 values.put(Contact.COLUMN_NAME_PHONE, contact.getPhone());
44 db.insert(Contact.TABLE_NAME, null, values);
45 contacts.add(contact);
46 names.add(contact.getName());
47 }
48
49 public void update(Contact contact) {
50 SQLiteDatabase db = dbHelper.getReadableDatabase();
51 ContentValues values = new ContentValues();
52
53 values.put(Contact.COLUMN_NAME_NAME, contact.getName());
54 values.put(Contact.COLUMN_NAME_EMAIL, contact.getEmail());
55 values.put(Contact.COLUMN_NAME_PHONE, contact.getPhone());
56
57 String selection = Contact.COLUMN_NAME_NAME + " = ? ";
58 String[] selectionArgs = {contact.getName()};
59
60 db.update(Contact.TABLE_NAME, values, selection, selectionArgs);
61
62 Contact c = getByName(contact.getName());
63 c.setName(contact.getName());
64 c.setEmail(contact.getEmail());
65 c.setPhone(contact.getPhone());
66 }
67
68 public void delete(Contact contact) {
69 SQLiteDatabase db = dbHelper.getWritableDatabase();
70 String selection = Contact.COLUMN_NAME_NAME + " = ?";
71 String[] selectionArgs = {contact.getName()};
72 db.delete(Contact.TABLE_NAME, selection, selectionArgs);
73 contacts.remove(contact);
74 names.remove(contact.getName());
75 }
76
77 public Boolean contactExist(String name) {
78 return getByName(name) != null;
79 }
80
81 public Contact getByName(String name) {
82 for (Contact contact : contacts) {
83 if (contact.getName().equals(name)) {
84 return contact;
85 }
86 }
87 return null;
88 }
89
90 public int size() {
91 return contacts.size();
92 }
93}
MainActivity.java
1package com.saulopz.agenda;
2
3import android.app.AlertDialog.Builder;
4import android.content.DialogInterface;
5import android.os.Bundle;
6import android.support.v7.app.AppCompatActivity;
7import android.view.View;
8import android.view.View.OnClickListener;
9import android.widget.AdapterView;
10import android.widget.ArrayAdapter;
11import android.widget.EditText;
12import android.widget.ListView;
13
14public class MainActivity extends AppCompatActivity implements OnClickListener {
15 private EditText editTextName;
16 private EditText editTextEmail;
17 private EditText editTextPhone;
18 private ArrayAdapter<String> adapter;
19 private ContactDAO contactDAO;
20
21 @Override
22 protected void onCreate(Bundle savedInstanceState) {
23 super.onCreate(savedInstanceState);
24 setContentView(R.layout.activity_main);
25
26 contactDAO = new ContactDAO(this);
27
28 editTextName = findViewById(R.id.editTextName);
29 editTextEmail = findViewById(R.id.editTextEmail);
30 editTextPhone = findViewById(R.id.editTextPhone);
31 findViewById(R.id.buttonOk).setOnClickListener(this);
32 findViewById(R.id.buttonClear).setOnClickListener(this);
33
34 ListView listContacts = findViewById(R.id.listContacts);
35 adapter = new ArrayAdapter<>(this,
36 android.R.layout.simple_list_item_1,
37 android.R.id.text1,
38 contactDAO.names);
39 listContacts.setAdapter(adapter);
40 adapter.notifyDataSetChanged();
41 listContacts.setOnItemClickListener(new AdapterView.OnItemClickListener() {
42 public void onItemClick(AdapterView<?> parent, View view,
43 int position, long id) {
44 String name = (String) parent.getItemAtPosition(position);
45 Contact contact = (contactDAO.getByName(name));
46 editTextName.setText(contact.getName());
47 editTextEmail.setText(contact.getEmail());
48 editTextPhone.setText(contact.getPhone());
49 }
50 });
51 listContacts.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
52 public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
53 int pos, long id) {
54 String name = (String) arg0.getItemAtPosition(pos);
55 Contact contact = (contactDAO.getByName(name));
56 dialogErase(getResources().getString(R.string.error_title),
57 getResources().getString(R.string.error_noname) + " " + name + "?", contact);
58 return true;
59 }
60 });
61 }
62
63 @Override
64 public void onClick(View v) {
65 switch (v.getId()) {
66 case R.id.buttonOk:
67 if (editTextName.getText().toString().trim().equals("")) {
68 dialog(getResources().getString(R.string.error_title),
69 getResources().getString(R.string.error_noname));
70 } else {
71 Contact contact = new Contact(
72 editTextName.getText().toString(),
73 editTextEmail.getText().toString(),
74 editTextPhone.getText().toString());
75 if (contactDAO.contactExist(contact.getName())) {
76 contactDAO.update(contact);
77 } else {
78 contactDAO.insert(contact);
79 }
80 adapter.notifyDataSetChanged();
81 }
82 break;
83 case R.id.buttonClear:
84 editTextName.setText("");
85 editTextEmail.setText("");
86 editTextPhone.setText("");
87 break;
88 }
89 }
90
91 public void dialog(String title, String content) {
92 Builder builder = new Builder(MainActivity.this);
93 builder.setTitle(title);
94 builder.setMessage(content);
95 builder.setNeutralButton("Ok", null);
96 builder.show();
97 }
98
99 public void dialogErase(String title, String content, final Contact contact) {
100 Builder builder = new Builder(MainActivity.this);
101 builder.setTitle(title);
102 builder.setMessage(content);
103 builder.setCancelable(false);
104 builder.setPositiveButton("ok",
105 new DialogInterface.OnClickListener() {
106 public void onClick(DialogInterface dialog, int id) {
107 contactDAO.delete(contact);
108 adapter.notifyDataSetChanged();
109 }
110 });
111 builder.setNegativeButton("cancel",
112 new DialogInterface.OnClickListener() {
113 public void onClick(DialogInterface dialog, int id) {
114 // do nothing
115 }
116 });
117 builder.show();
118 }
119}
