The document provides instructions for playing audio files in Android using the MediaPlayer class. It explains how to create a MediaPlayer object from a raw audio resource, call methods like start(), pause(), stop() to play, pause and stop the audio, and check the playing status with isPlaying(). It also demonstrates how to setup button clicks to call these methods and release the MediaPlayer when the activity stops.

1. 10.1. Audio
Oum Saokosal
Master of Engineering in Information Systems, South Korea
855-12-252-752
oum_saokosal@yahoo.com

2. Play Audio
• To play an audio file, you need to use MediaPlayer class.
• To create a song, call MediaPlayer.create(this, R.raw.song1).
• To start a song, call start() method.
• To temporarily stop, call: pause() and seekTo(0).
• To test whether the song is playing, call isPlaying().
• To end the song completely, call stop() and release().
• Note: This example uses the internal song. You need to
create raw folder in res folder and place a song inside it. To
call the song, use R.raw.song_name

3. <Button
android:id="@+id/playSound"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="playSound"
android:text="Play" />
<Button
android:id="@+id/pauseSound"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="pauseSound"
android:text="Pause" />
<Button
android:id="@+id/stopSound"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="stopSound"
android:text="Stop" />

4. public class PlaySoundActivity extends Activity {
MediaPlayer mp;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mp = MediaPlayer.create(this, R.raw.onthefloor);
}
public void playSound(View v){
if (mp != null) {
if(!mp.isPlaying()) mp.start();
}
}
public void pauseSound(View v){
if (mp != null) {
if (mp.isPlaying()) mp.pause();
}
}

5. public void stopSound(View v){
if (mp != null) {
if (mp.isPlaying()) {
mp.pause();
mp.seekTo(0);
}
}
}
@Override
protected void onStop() {
super.onStop();
// deallocate all memory
if (mp != null) {
if (mp.isPlaying()) mp.stop();
mp.release();
mp = null;
}
}
}//end of class

7. Go on to the next slide