Download Try It Out - Department of Computer Science

Try It Out!
App Development for Smart Devices
CS 441/541 - Fall 2014
Lec #7: Audio, Video
& Telephony
Tamer Nadeem
Dept. of Computer Science
Trt It Out
•  Example - SoundPool
•  Example - VideoView
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CS 441/541 - App Development for Smart Devices
SoundPool
•  Android provides two API's for playing sounds: SoundPool and
MediaPlayer.
•  SoundPool can be used for small audio clips. It can repeat sounds and
play several sounds simultaneously. The sound files played with
SoundPool should not exceed 1 MB.
•  SoundPool does load the file asynchronously. In recent Android SDK,
it is possible to check if the loading is complete via
OnLoadCompleteListener.
•  Mediaplayer is better suited for longer music and movies.
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Example of SoundPool
•  Create an application that will start playing a sound once the finger
touches the display. Create an Android project
“cs.edu.odu.cs495.soundpool" with the Activity "PlaySound“
•  Get a free sound effect from
http://hamsterrepublic.com/ohrrpgce/Free_Sound_Effects.html, put it
into your "res/raw" folder under the name "sound1.ogg".
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView android:text="Click on the screen to start playing"
android:id="@+id/textView1" android:layout_width="fill_parent"
android:layout_height="fill_parent">
</TextView>
</LinearLayout>
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CS 441/541 - App Development for Smart Devices
Example of SoundPool
package edu.odu.cs.cs495.soundpool;
import android.app.Activity;
import android.media.AudioManager;
import android.media.SoundPool;
import android.media.SoundPool.OnLoadCompleteListener;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
public class PlaySound extends Activity implements OnTouchListener {
private SoundPool soundPool;
private int soundID;
boolean loaded = false;
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CS 441/541 - App Development for Smart Devices
Example of SoundPool
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
View view = findViewById(R.id.textView1);
view.setOnTouchListener(this);
// Set the hardware buttons to control the music
this.setVolumeControlStream(AudioManager.STREAM_MUSIC);
// Load the sound
soundPool = new SoundPool(10, AudioManager.STREAM_MUSIC, 0);
soundPool.setOnLoadCompleteListener(new OnLoadCompleteListener() {
@Override
public void onLoadComplete(SoundPool soundPool, int sampleId, int status) {
loaded = true;
}
});
soundID = soundPool.load(this, R.raw.sound1, 1);
}
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CS 441/541 - App Development for Smart Devices
Example of SoundPool
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
// Getting the user sound settings
AudioManager audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
float actualVolume = (float) audioManager.
getStreamVolume(AudioManager.STREAM_MUSIC);
float maxVolume = (float) audioManager.
getStreamMaxVolume(AudioManager.STREAM_MUSIC);
float volume = actualVolume / maxVolume;
// Is the sound loaded already?
if (loaded) {
soundPool.play(soundID, volume, volume, 1, 0, 1f);
Log.e("Test", "Played sound");
}
}
return false;
}
}
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Example of VideoView
•  A simple example using VideoView to play 3gp from YouTube
main.xml
<?xml version="1.0" encoding="utf-­‐8"?> <LinearLayout xmlns:android="
http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content"> <VideoView android:id="@+id/myvideoview" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout> </LinearLayout>
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Example of VideoView
package edu.odu.cs.cs495.MyVideoView; import android.app.Activity; import android.net.Uri; import android.os.Bundle; import android.widget.MediaController; import android.widget.VideoView; public class MyVideoView extends Activity { String SrcPath = "rtsp://<REPLACE WITH PATH TO YouTube video (3gp)>"; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); VideoView myVideoView = (VideoView)findViewById(R.id.myvideoview); myVideoView.setVideoURI(Uri.parse(SrcPath)); myVideoView.setMediaController(new MediaController(this)); myVideoView.requestFocus(); myVideoView.start(); } }
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