Beginner here, I have a simple question.
In Android what would be the best what to check for something at regular intervals?
Please bear with me, I'll try to explain the best I can --
For example my audio app is very simple, a main activity and a service. The main activity has a UI with two buttons, start and stop audio. I press start and the audio service starts. Likewise when I click Stop the service stops and the audio ends. If isLooping() is hard-coded to true there is no issue because the audio never ends unless I hit stop button, which stops the audio service and also resets the button states.
This is an issue now because I set isLooping() to false so the audio doesn't loop. So the audio will stop playing but the service is still running.
I want to be able to detect when the audio stops so I can set the states of the UI buttons. So I need something that is always checking whether audio is playing (i.e. check player.isPlaying() so I can end the service and set the enable/disable state of the buttons.
I figured out binding to the service so I can access the MediaPlayer controls via my main activity so I know the code to check if it's playing, but WHERE do I put this code so it's checked all the time?
Am I making sense? I know this is probably very simple. Thanks for any help.
You can repeat it with the TimerTask and Timer. Code below:
public final void RepeatSoundFunction(){
t = new Timer();
tt = new TimerTask() {
#Override
public void run() {
mp.seekTo(0); //Reset sound to beginning position
mp.start(); //Start the sound
t.purge(); //Purge the sound
}
};
t.schedule(tt, 10*1000); //Schedule to run tt (TimerTask) again after 10 seconds
}
then you set a MediaPlayer onCompletionListener and in there you put this.
Inside the run-code you can check for other things than
music, I just show an example with the audio.
Related
Example:
Activity 1:
main screen.
player = new media player()
player.start() //the sound began
now i have to equalize this same sound in another Activity...
Activity 2:
edition screen
the sound keeps playing and want to stop
example:
player.setVolume(0.0)
player.stop()
thank you
Declare player as public static in screen1
then you can access this media player in screen 2
like screen1
:
public static MediaPlayer player;
player=new MediaPlayer();
=================
===========
write your code
Screen 2 ::-
if you want to use media player in screen 2 use this code ::-
screen1.player.start(); screen1.player.stop();
You must create Service. Service to host the MediaPlayer and have your Activities communicate with the Service to play and stop songs. Don't forget to call release on the MediaPlayer when you are done. Bind the activity to service
For the sample Equalizer sample. The sample is not integrated with Service it just a seperate unit.
Obtain the sessionid of the MediaPlayer and pass it to equalizer.
Usually when we are using MediaPlayer, as playing music in itself doesnt really require to have a graphical interface, we usually use a service because only the sound resulting by the playback is needed.
- Create the mediaplayer in a service
- Send somes request to the Service after binding to it, or even by sending broadcasts to it so that it can play, stop, pause, set volume whatever you want.
Can an audio service be set to a timer? Example would be for a sleep machine type app where the user clicks the time they want the sound to play and then the sound plays for that time. I was told that using a service to handle the audio was the proper way but I do not know how to get it to work with a timer for a user selected input
Short answer, yes it is possible.
I have done audio recording using a background service, have also done FTP downloads in a background service.
You would use a started service in this case, it will play audio using following:
http://developer.android.com/reference/android/media/MediaPlayer.html
You may pass a value from Activity to Service using intent extras, for example
Intent intService = new Intent(AndroidSignageActivity.this, SignageDownloadService.class);
intService.putExtra("TIMEVAL_MILLISEC", 1000);//
startService(intService);
In the service, you can extract the value and use it in onStartCommand method as following:
long lTimeout = 0;
if(intent.hasExtra("TIMEVAL_MILLISEC")){
lTimeout = intent.getLongExtra("TIMEVAL_MILLISEC", 100);
}
I'm writing an app that plays an audio file and I want it to continue doing so while minimized. I've done this, but I want the audio playback to be on a separate thread, because according to the Android developer website, CPU-heavy services work better on a separate thread.
First I tried using IntentService (this was the perfect solution). However, for some stupid reason, the service destroys itself once the code executed - which is immediately after it starts playing the file. I couldn't prevent this.
Then I created a Thread that runs the Service. However, I don't know how to make the Thread stop the service when needed - the best thing I could do is this:
serviceThread = new Thread() {
public void run() {
while (true) {
if (playAudio) {
startService(new Intent(getApplicationContext(),
MusicService.class));
playAudio = false;
}
if (stopAudio) {
stopService(new Intent(getApplicationContext(),
MusicService.class));
stopAudio = false;
}
}
}
};
Evidently, after that I set startService to true to start the service and I set stopService to true to stop it. However, I believe the Thread has to keep doing the check all the time, thus doing a lot of useless work all the time. I'm not even sure why is the app working, isn't it doing like million checks every second?
How can I properly do this?
Assuming you can't block the thread that the service runs in, you can add a java.lang.Thread.Sleep at the end of the loop if you're worried about doing too much work.
You might also want to read up thread scheduling and time slicing to understand why your app is still working (but probably using a lot more CPU than necessary).
I am a little confused on how to manage the mediaplayer functions.
I want a sound to repeat for a designated number of seconds. It is intended to be very attention getting. The problem is that I don't know how to make the sound stop. I see that there are Async functions in the MediaPlayer but I don't get it. Should I just do my own Async or CountdownTimer that stops the sounds at the end of the timer?
MediaPlayer mediaPlayer = MediaPlayer.create(context, R.raw.telephone_ring_3);
mediaPlayer.setLooping(true);
mediaPlayer.setVolume(1.0f, 1.0f);
mediaPlayer.start();
Insight or best practices appreciated
If there is not some other user initiated event that stops the sound, then yes, I would probably go with a CountdownTimer.
I'm developing an media player application for Android, for which I need to handle any Alarm notification, and based on that I'll pause my playback. When the Alarm in snoozed or dismissed, I'll then resume the playback.
I googled a lot for the Alarm handling, but what I found was the way to enable Alarm notifications through code, set the intent and then handle it. However, no where could I locate just handling the Alarm notification part. I don't need to set the Alarm on, it could've been set by the user, and I don't need to programmatically. All I need is just handle that notification.
Any ideas on this would be extremely useful?
Thanks,
Asheesh
HI Asheesh Vashishtha,
Correct me on this, but AFAIK whenever any other application even if it is the alarm clock, is activated, your activity will surely go in background. So i guess u can override the OnPause and OnResume functions to put your bit of code. As far as snooze or other things are concerned, they all will result in the Alarm Activity getting destroyed(or paused, don know much about it) and your activity will get resumed. So that wont be a matter of concern for u!
Hope this helps...
AFAIK, there is no way for you to be notified of what the Alarm Clock application does, any more than you get notified about any other third-party alarm clock.
Note that AlarmManager -- what you were probably reading about -- is not the same as the Alarm Clock application.
Sorry!
I ran into a similar situation while developing a media player. My solution was to use the AudioManager's OnAudioFocusChangeListener.
You implement the listener in the class like so
public class VideoPlayerHelper implements AudioManager.OnAudioFocusChangeListener {
Then you override onAudioFocusChange
#Override
public void onAudioFocusChange(int focusChange) {
switch (focusChange) {
//Just fall through by omitting break
case AudioManager.AUDIOFOCUS_LOSS:
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
LogUtil.log(LogUtil.DEBUG, TAG, "AUDIOFOCUS_LOSS or AUDIOFOCUS_LOSS_TRANSIENT"); //Custom logging class
if (isPlaying()) {
pause();
mAudioManager.abandonAudioFocus(VideoPlayerHelper.this);
}
break;
case AudioManager.AUDIOFOCUS_GAIN:
LogUtil.log(LogUtil.DEBUG, TAG, "AUDIOFOCUS_GAIN"); //Custom logging class
break;
default:
break;
}
}
The key here is AudioManager.AUDIOFOCUS_LOSS_TRANSIENT. This was the code the listener kept receiving when the alarm clock would go off (on The Note 5). So I simply handled AudioManager.AUDIOFOCUS_LOSS_TRANSIENT the same as AudioManager.AUDIOFOCUS_LOSS by pausing the media player and letting go of the audio focus.
When we setup the media player, I added this line before adding the data source
player.setAudioStreamType(AudioManager.STREAM_MUSIC);
Make sure your code for starting the media player also has this line in it (I have it in the start code and onResume code in case the alarm went off while the app was in the background).
mAudioManager.requestAudioFocus(VideoPlayerHelper.this, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
That line helps you get back the audio focus when you hit the play button after dismissing the alarm clock.
You should also let go off audio focus when you're finished with the media player. I put this line of code in the onStop and onDetach methods.
mAudioManager.abandonAudioFocus(VideoPlayerHelper.this);
It's not as much setup as you may think and it allows you to adjust your media player whenever unexpected audio is introduced (such as an alarm clock or timer goes off).