Android Media - Sounds
This tutorial describes the usage of the Android media API for playing and recording sound. It is based on Eclipse 3.7, Java 1.6 and Android 4.0.3 (Ice Cream Sandwich).
Table of Contents
Android provides two main API's for playing sounds. The first one via the
SoundPool class and the other one via the MediaPlayer class.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. As of Android API8 it is possible to check if the loading is complete via a OnLoadCompleteListener.Android supports different audio streams for different purposes. The phone volume button can be configured to control a specific audio stream, e.g. during a call the volume button allow increase / decrease the caller volume. To set the button to control the sound media stream set the audio type in your application.
context.setVolumeControlStream(AudioManager.STREAM_MUSIC);
MediaPlayer is better suited for longer music and movies.The
android.media.MediaRecorder class can be used to record audio and video. To useMediaRecorder you need to set the source device and the format.You can add new Media to the Android media library. Via an
Intent you can tell the media application on the device that new content is available. The following demonstrates that.// add new file to your media library
ContentValues values = new ContentValues(4);
long current = System.currentTimeMillis();
values.put(MediaStore.Audio.Media.TITLE, "audio" + audiofile.getName());
values.put(MediaStore.Audio.Media.DATE_ADDED, (int) (current / 1000));
values.put(MediaStore.Audio.Media.MIME_TYPE, "audio/3gpp");
values.put(MediaStore.Audio.Media.DATA, audiofile.getAbsolutePath());
ContentResolver contentResolver = getContentResolver();
Uri base = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
Uri newUri = contentResolver.insert(base, values);
// Notifiy the media application on the device
sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, newUri));
Android supports a variaty of formats. See Supported Media Formats in the Android Developer Guide .
The following assumes that you are already familiar with basic Android programming. Please seeAndroid Tutorial for an introduction.
We will create an application which will start playing a sound once the finger touches the display. Create an Android project called "de.vogella.android.soundpool" with an Activity called PlaySound.
Change the layout
main.xml to the following.<?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/textView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Click on the screen to start playing" >
</TextView>
</LinearLayout>
Download a sound which you want to play. For example the Free Sound Effects site contains several free sound examples.
Put the sound file into your "res/raw" folder under the name "sound1.ogg". This assumes that you downloaded an ogg file.
Create the following coding for your activity.
package de.vogella.android.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;
/** 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);
}
@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;
}
}
If you touch your activity your sound should be played. It will use the current volume settings.
We will create an application which will start playing a sound once the finger touches the display. Create an Android project called "de.vogella.android.media.soundrecording" with an activity calledRecordSound.
Add to the AndroidManifest.xml file the permission to write to the SD card and to record audio data.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.RECORD_AUDIO" />
Change the layout
main.xml to the following.<?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="horizontal" >
<Button
android:id="@+id/start"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Start Recording"
android:onClick="startRecording" />
<Button
android:id="@+id/stop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Stop Recording"
android:enabled="false"
android:onClick="stopRecording"
/>
</LinearLayout>
Change your activity class to the following.
package de.vogella.android.media.soundrecording;
import java.io.File;
import java.io.IOException;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Intent;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
public class SoundRecordingActivity extends Activity {
MediaRecorder recorder;
File audiofile = null;
private static final String TAG = "SoundRecordingActivity";
private View startButton;
private View stopButton;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
startButton = findViewById(R.id.start);
stopButton = findViewById(R.id.stop);
}
public void startRecording(View view) throws IOException {
startButton.setEnabled(false);
stopButton.setEnabled(true);
File sampleDir = Environment.getExternalStorageDirectory();
try {
audiofile = File.createTempFile("sound", ".3gp", sampleDir);
} catch (IOException e) {
Log.e(TAG, "sdcard access error");
return;
}
recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile(audiofile.getAbsolutePath());
recorder.prepare();
recorder.start();
}
public void stopRecording(View view) {
startButton.setEnabled(true);
stopButton.setEnabled(false);
recorder.stop();
recorder.release();
addRecordingToMediaLibrary();
}
protected void addRecordingToMediaLibrary() {
ContentValues values = new ContentValues(4);
long current = System.currentTimeMillis();
values.put(MediaStore.Audio.Media.TITLE, "audio" + audiofile.getName());
values.put(MediaStore.Audio.Media.DATE_ADDED, (int) (current / 1000));
values.put(MediaStore.Audio.Media.MIME_TYPE, "audio/3gpp");
values.put(MediaStore.Audio.Media.DATA, audiofile.getAbsolutePath());
ContentResolver contentResolver = getContentResolver();
Uri base = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
Uri newUri = contentResolver.insert(base, values);
sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, newUri));
Toast.makeText(this, "Added File " + newUri, Toast.LENGTH_LONG).show();
}
}
You should be able to record a sound, if you press the "Start Recording" button. Once you press the stop recording button, the recording will be stopped and the file will be added to your media library.
TPTV is one of the best resource for entertainment. Conventional cable TV feed plays media content using a linked network of cables at all times while in IPTV m3u content remains on the host network until the user requests it.
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