Bài giảng Android nâng cao: Bài 4 - Trương Xuân Nam

Bài giảng Android nâng cao: Bài 4 Media Services (continue) + Location Base Services cung cấp cho người học những kiến thức như: Media Services (continue); Global Positioning Services; Geocoding Locations; Mapping Locations. Mời các bạn cùng tham khảo!

ANDROID NÂNG CAO

BÀI 4: Media Services (continue) +

Location Base Services

2 Location Base Services

– Global Positioning Services

– Geocoding Locations

– Mapping Locations

P à1.1

VideoView + MediaController

 V V à à à à à à à à à

à à à start , pause , suspend , resume ,

stopPlayback , seekTo (millis)

MediaPlayer + SurfaceView

public class MainActivity extends Activity

implements SurfaceHolder.Callback, OnPreparedListener {

private MediaPlayer mediaPlayer;

protected void onCreate(Bundle savedInstanceState) {

public void onPrepared(MediaPlayer mp) { mediaPlayer.start(); }}

Text to speech

Text to speech

g i activity m c đ nh đ ki m tra có d li u cho TTS ch a

Intent intent = new Intent(Engine.ACTION_CHECK_TTS_DATA);

// d li u đã có t o đ i t ng TTS m c đ nh}

}

Text to speech

TextToSpeech talker = new TextToSpeech(this, new OnInitListener() {

public void onInit(int status) {

talker speak Hi There TextToSpeech QUEUE FLUSH null}

}

TextToSpeech tts = new TextToSpeech(this, new OnInitListener() {

public void onInit(int status) {

if (status != TextToSpeech.SUCCESS) return;

Camera

1 Previewing

2 After shutter is pressed

3 Image transferred from

mImageView = (ImageView) findViewById(R.id.mImageView);

Intent mIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);startActivityForResult(mIntent, 101);

}

private void showToast(Context context, String text) {

Toast.makeText(context, text, 1).show();

}

C à à à à

protected void onActivityResult(int req, int res, Intent intent) {

super.onActivityResult(req, res, intent);

if (res == RESULT_CANCELED) return;

}

<uses-permission android:name="android.permission.CAMERA" />

<uses-feature android:name="android.hardware.camera" />

<uses-feature android:name="android.hardware.camera.autofocus" />

The takePicture Method

Global Positioning Services

P à2.1

Global Positioning Services

Global Positioning Services

< uses-feature android:name ="android.hardware.location" />

< uses-feature android:name ="android.hardware.location.gps" />

Location services: example

Location services: example

Location services: example

Location services: i ch

 Thông qua LocationManager à à y c u

– List<String> getAllProviders (): y t àprovider

– String getBestProviders (Criteria, enableOnly): y provider à

p t i u n

• Criteria: power, accuracy, speed, altitude– LocationProvider getProvider (name): L y provider theo tên

– requestLocationUpdate (providerName, minTime,

minDistance, listener): Yêu u i listener i minTime giây c provider t n ch n midDistance t

mili-Geocoding Locations

Geocoding Locations - example

Geocoding Locations - example

Geocoding Locations - example

Mapping Locations

P à2.3

Google Maps bên ngoài

<uses-permission android:name="android.permission.INTERNET" />

 Trong AndroidManifest.xml, n <application>, à

sung thêm các dòng sau:

android:value="KEY"/>

android:value="@integer/google_play_services_version" />