8/25/2015 08:54:00 SA
Hướng dẫn lấy mã SHA1 trên AndroidStudio:
https://duythanhcse.wordpress.com/2014/12/21/bai-54-google-maps-android-api-phan-2/
https://duythanhcse.wordpress.com/2014/12/21/bai-54-google-maps-android-api-phan-2/
8/25/2015 08:52:00 SA
Nội dung:
- Tabs
- Custom adapter
--------------
1. Tabs:
- Sử dụng tabhost tạo ví dụ như sau
- Download icon của dự án:
https://drive.google.com/file/d/0B8tAQ0_sJKCSOExhcFpFY1VjTXM/view?usp=sharing
- Cấu trúc dự án:
- Mã nguồn XML: 4 tệp tin
+ Tệp tin activity_main.xml:
+ Tệp tin photoslayout.xml:
+ Tệp tin songslayout.xml:
+ Tệp tin videoslayout.xml:
- Tạo 3 tệp tin XML trong thư mục drawable: 3 tệp tin
+ Tệp tin icon_photos_tab.xml:
+ Tệp tin icon_songs_tab.xml:
+ Tệp tin icon_videos_tab.xml:
- Mã nguồn java:
+ Tệp tin PhotosActivity.java:
+ Tệp tin SongsActivity.java:
+ Tệp tin VideosActivity.java:
+ Tệp tin MainActivity.java:
- Tệp tin AndroidMainifest.xml:
2. Custom adapter:
- Xem bài 10, phần 3: http://huongdan-laptrinh.blogspot.com/2015/08/bai-10-how-to-work-with-threads-files.html
Bài tập:
1.
2.
- Tabs
- Custom adapter
--------------
1. Tabs:
- Sử dụng tabhost tạo ví dụ như sau
https://drive.google.com/file/d/0B8tAQ0_sJKCSOExhcFpFY1VjTXM/view?usp=sharing
- Cấu trúc dự án:
+ Tệp tin activity_main.xml:
<?xml version="1.0"
encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="@+id/linelayout"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TabWidget
android:id="@android:id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
</TabHost>
<?xml version="1.0"
encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:id="@+id/textViewPhotos"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="15dp"
android:text="Photos
here"
android:textSize="18sp"
/>
</LinearLayout>
<?xml version="1.0"
encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:id="@+id/textViewSongs"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="15dp"
android:text="Songs
here"
android:textSize="18sp"
/>
</LinearLayout>
<?xml version="1.0"
encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:id="@+id/textViewVideos"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="15dp"
android:text="Videos
here"
android:textSize="18sp"
/>
</LinearLayout>
- Tạo 3 tệp tin XML trong thư mục drawable: 3 tệp tin
+ Tệp tin icon_photos_tab.xml:
<?xml version="1.0"
encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/photos_gray"
android:state_selected="true"/>
<item android:drawable="@drawable/photos_white"/>
</selector>
<?xml version="1.0"
encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/songs_gray"
android:state_selected="true"/>
<item android:drawable="@drawable/songs_white"/>
</selector>
<?xml version="1.0"
encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/videos_gray"
android:state_selected="true"/>
<item android:drawable="@drawable/videos_white"/>
</selector>
- Mã nguồn java:
+ Tệp tin PhotosActivity.java:
package com.tabs;
import
android.app.Activity;
import android.os.Bundle;
public class PhotosActivity extends Activity {
@Override
protected void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.photoslayout);
}
}
package com.tabs;
import
android.app.Activity;
import android.os.Bundle;
public class SongsActivity extends Activity {
@Override
protected void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.songslayout);
}
}
package com.tabs;
import
android.app.Activity;
import android.os.Bundle;
public class VideosActivity extends Activity {
@Override
protected void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.videoslayout);
}
}
package com.tabs;
import android.app.TabActivity;
import
android.content.Intent;
import android.os.Bundle;
import
android.widget.TabHost;
import
android.widget.TabHost.TabSpec;
public class MainActivity extends TabActivity {
@Override
protected void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TabHost tabhost = getTabHost();
//Tabhost photos
TabSpec photosSpec =
tabhost.newTabSpec("Photos");
photosSpec.setIndicator("Photos",
getResources().getDrawable(R.drawable.icon_photos_tab));
Intent photosIntent = new Intent(this, PhotosActivity.class);
photosSpec.setContent(photosIntent);
//Tabhost songs
TabSpec songsSpec =
tabhost.newTabSpec("Songs");
songsSpec.setIndicator("Songs",
getResources().getDrawable(R.drawable.icon_songs_tab));
Intent songsIntent = new Intent(this, SongsActivity.class);
songsSpec.setContent(songsIntent);
//Tabhost videos
TabSpec videosSpec =
tabhost.newTabSpec("Videos");
videosSpec.setIndicator("Videos",
getResources().getDrawable(R.drawable.icon_videos_tab));
Intent videosIntent = new Intent(this, VideosActivity.class);
videosSpec.setContent(videosIntent);
//Add all TabSpec to TabHost
tabhost.addTab(photosSpec);
tabhost.addTab(songsSpec);
tabhost.addTab(videosSpec);
}
}
- Tệp tin AndroidMainifest.xml:
<?xml version="1.0"
encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.tabs"
android:versionCode="1"
android:versionName="1.0"
>
<uses-sdk
android:minSdkVersion="17"
android:targetSdkVersion="17"
/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme"
>
<activity
android:name=".MainActivity"
android:label="@string/app_name"
>
<intent-filter>
<action android:name="android.intent.action.MAIN"
/>
<category android:name="android.intent.category.LAUNCHER"
/>
</intent-filter>
</activity>
<activity android:name=".PhotosActivity"/>
<activity android:name=".SongsActivity"/>
<activity android:name=".VideosActivity"/>
</application>
</manifest>
2. Custom adapter:
- Xem bài 10, phần 3: http://huongdan-laptrinh.blogspot.com/2015/08/bai-10-how-to-work-with-threads-files.html
Bài tập:
1.
2.
8/25/2015 08:50:00 SA
Hướng dẫn sử dụng SQLite:
Viết ứng dụng lưu danh bạ điện thoại như sau:
Cấu trúc dự án:
Mã nguồn:
+ Tệp tin DatabaseHandler.java:
+ Tệp tin MainActivity.java:
+ Tệp tin Person.java:
+
Sử dụng công cụ
SQLite Administrator để tạo một CSDL: link download bên dưới:
https://drive.google.com/file/d/0B8tAQ0_sJKCSRkJoOS1NRUl5bGM/view?usp=sharing
https://drive.google.com/file/d/0B8tAQ0_sJKCSRkJoOS1NRUl5bGM/view?usp=sharing
Xem hướng dẫn về các
câu lệnh cơ bản của sqlite:
http://www.thegeekstuff.com/2012/09/sqlite-command-examples/
http://www.thegeekstuff.com/2012/09/sqlite-command-examples/
Các chức năng cơ bản để thao tác với
SQLite Android gồm:
1) Cách tạo / xóa một cơ
sở dữ liệu:
SQLiteDatabase db = openOrCreateDatabase("NameDataBase.db", Context.MODE_PRIVATE, null);
|
2) Cách tạo / xóa bảng
trong SQLite:
String sql = "CREATE TABLE IF NOT
EXISTS student(rollno VARCHAR, name VARCHAR, marks VARCHAR);";
db.execSQL(sql);
Trong đó: student là tên bảng cần tạo
rollno, name, marks: là tên các trường (các cột) trong bảng
VARCHAR là kiểu dữ liệu
|
3) Cách thêm/ sửa/ xóa dữ
liệu trong bảng:
Thêm dữ liệu:
Thêm dữ liệu:
String sql = "INSERT INTO student VALUES('"Cột 1"','"Cột
2"','"Cột 3"');";
db.execSQL(sql);
|
Sửa dữ liệu:
String sql = "UPDATE student SET name='"+value1+"',marks='"+value2+"'
WHERE
rollno='"+value3+"'";
db.execSQL(sql);
Trong đó: name, markslà tên cột trong bảng, value1, value2là các giá trị cần thay đổi
|
Xóa dữ liệu
4) Cách truy vấn dữ liệu
trong bảng:
db.execSQL(sql);
|
Mã nguồn:
+ Tệp tin DatabaseHandler.java:
package com.contacts_sqlite;
import java.util.ArrayList;
import java.util.List;
import
android.content.ContentValues;
import
android.content.Context;
import
android.database.Cursor;
import
android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import
android.database.sqlite.SQLiteOpenHelper;
public class DatabaseHandler extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "constactsManager";
private static final String TABLE_CONTACTS = "contacts";
//Table culums names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_PHONE = "phone";
public DatabaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void
onCreate(SQLiteDatabase db) {
String CREATE_CONTACTS_TABLE = "CREATE TABLE
" +
TABLE_CONTACTS + "("
+ KEY_ID + " INTEGER
PRIMARY KEY," + KEY_NAME + " TEXT,"
+ KEY_PHONE + " TEXT" + ")";
db.execSQL(CREATE_CONTACTS_TABLE);
}
@Override
public void
onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF
EXISTS " + TABLE_CONTACTS);
onCreate(db);
}
//add new contact
void addContact(Person person) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, person.GetName());
values.put(KEY_PHONE, person.GetPhone());
//insert to database
db.insertOrThrow(TABLE_CONTACTS, null, values);
db.close();
}
Person getPerson(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query( TABLE_CONTACTS, new String[] {KEY_ID, KEY_NAME, KEY_PHONE}, KEY_ID + "=?", new String[] {String.valueOf(id)},
null, null, null, null );
if (cursor != null) {
cursor.moveToFirst();
}
Person person = new Person(Integer.parseInt(cursor.getString(0)),
cursor.getString(1), cursor.getString(2));
return person;
}
//get all contacts
public List<Person> getAllContacts() {
List<Person> contactslist = new
ArrayList<Person>();
String selectAllQuery = "SELECT * FROM
" +
TABLE_CONTACTS;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor =
db.rawQuery(selectAllQuery, null);
if (cursor.moveToFirst()) {
do {
Person person = new Person();
person.SetId(Integer.parseInt(cursor.getString(0)));
person.SetName(cursor.getString(1));
person.SetPhone(cursor.getString(2));
contactslist.add(person);
} while(cursor.moveToNext());
}
return contactslist;
}
}
+ Tệp tin MainActivity.java:
package com.contacts_sqlite;
import java.util.List;
import
android.app.Activity;
import
android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import
android.view.MenuItem;
import android.view.View;
import
android.widget.ListView;
public class MainActivity extends Activity {
private ListView myListView;
private MyAdapterArray myAdapter;
private List<Person> personArray;
public static final int REQUEST_CODE_ADD = 2;
@Override
protected void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myListView = (ListView)
findViewById(R.id.myListView);
DatabaseHandler
db = new DatabaseHandler(this);
db.addContact(new Person("Nguyen Van
A",
"0905686868"));
db.addContact(new Person("Nguyen Van
B",
"0903555999"));
db.addContact(new Person("Nguyen Van
C",
"0985355355"));
// create ArrayList
personArray =
db.getAllContacts();
myAdapter = new MyAdapterArray(this, R.layout.list_item, personArray);
myListView.setAdapter(myAdapter);
}
public void onClickAdd(View v) {
//create the intent
Intent intent = new Intent(MainActivity.this, AddActivity.class);
//start the intent
this.startActivityForResult(intent,
REQUEST_CODE_ADD);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent
data)
{
if(requestCode==REQUEST_CODE_ADD)
{
DatabaseHandler db = new DatabaseHandler(this);
personArray =
db.getAllContacts();
myAdapter.notifyDataSetChanged();
}
}
//….
}
+ Tệp tin Person.java:
package com.contacts_sqlite;
public class Person {
int id;
private String name, phone;
public Person() {
}
public Person(String _name, String _phone) {
this.name = _name;
this.phone = _phone;
}
public Person(int _id, String _name,
String _phone) {
this.id = _id;
this.name = _name;
this.phone = _phone;
}
public int GetId() {
return this.id;
}
public void SetId(int _id) {
this.id = _id;
}
public void SetName(String
_name) {
this.name = _name;
}
public String GetName() {
return name;
}
public void SetPhone(String
_phone) {
this.phone = _phone;
}
public String GetPhone() {
return phone;
}
}
+