Develop Reference

Disable volume up/down to open camera

I have an app using firebase scanning to scan barcodes. I want to disable the use of volume up/down to open the scanner/camera. I also want the user to be able to still change the volume using those button.
I tried overwriting the onKeyDown event on my base activity but it doesn't fix my issue.
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN || keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
return false;
} else {
return super.onKeyDown(keyCode, event);
}
}

Android MediaPlayer to mute on a single click on Volume down botton pressed

I am using Android's MediaPlayer in my RingtoneService (which is a background Service for Ringtone in my application)to ring a ringtone when my Alarm goes on and off!
on the start of Ringtone Service for alarming
MediaPlayer mediaSong;
mediaSong = MediaPlayer.create(this, R.raw.xyz);
mediaSong.start();
on stop after some time
mediaSong.stop();
Its perfect in ringing and stopping the tone.whereas, I would like to make my device silent or say mute when I click on hardware's volume button pressed when an alarm is still ringing.
some stated solutions didn't answer my requirement.Any help is appreciated, please.
Please let me know somewhere if I am unclear!
Thanks in advance!

You need to override onKeyDown method in your Activity.
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN ||
keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
mediaSong.stop
return true;
}
return super.onKeyDown(keyCode, event);
}

How to control android media volume using volume keys

Can anyone provide sample code for adjusting media volume using volume keys, and also it should display a volume alert progress while pressing the keys.

I think you want this.
public boolean onKeyDown(int keyCode, KeyEvent event)
{
if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN || keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
// Do your thing
return true;
} else {
return super.onKeyDown(keyCode, event);
}
}

Android listener for changing of ring volume and other settings?

I was wondering if there is a way to know if the user has changed the ring volume or changes any settings on the phone? I'm trying to create an app that has that capability: detects whether the user changed the ring volume or changed any settings on his/her own device?

I solved a similar issue. I had to limit the max volume in an app, so this is what I did (audio is instance of AudioManager):
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN || keyCode == KeyEvent.KEYCODE_VOLUME_UP){
if(audio != null){
int curVolume = audio.getStreamVolume(AudioManager.STREAM_MUSIC);
int maxVolume = Preferences.getDefaultMaxVolume(Main.this);
if(curVolume > maxVolume) audio.setStreamVolume(AudioManager.STREAM_MUSIC, maxVolume, 0);
}
}
return super.onKeyDown(keyCode, event);
}
You can simply use the setStreamVolume() method to change progrmatically the volume, if needed...

android - overridden volume button has affected back button?

Using the code below I have stopped the use of the volume buttons unless I am streaming audio (otherwise it annoyingly changes the ringer volume), but the 'Back' button isn't working.
Pressing 'back' should got to my phones desktop (or exit my app, like you would expect), but it isn't doing anything. If I open the menu, 'Back' will close the menu as it should, but I can't leave the app.
I have copied the code onto other activities within my app, if I open another activity within my app, because the 'Back' button isn't working, I can't go back to the main screen :)
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
//Suppress the use of the volume keys unless we are currently listening to the stream
if(keyCode==KeyEvent.KEYCODE_VOLUME_UP) {
if(StreamService.INT_PLAY_STATE==0){
return true;
}else{
return false;
}
}
if(keyCode==KeyEvent.KEYCODE_VOLUME_DOWN) {
if(StreamService.INT_PLAY_STATE==0){
return true;
}else{
return false;
}
}
return false;
Why is this happening?

Haven't tested, but I think you need to include an else where you call super.onKeyDown, ie:
if(keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
code
} else if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
more code
} else {
super.onKeyDown(keyCode, event);
}
Otherwise, you're capturing all keycodes and returning false after checking the volume codes.

A simpler and more robust way to have the volume keys always control the Media volume is to insert this line into your Activity's onCreate():
setVolumeControlStream(AudioManager.STREAM_MUSIC);

Dude, just change the audio context on that activity to media volume:
http://developer.android.com/reference/android/media/AudioManager.html
EDIT:
private AudioManager audio;
Inside onCreate:
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
Override onKeyDown:
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_VOLUME_UP:
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
return true;
case KeyEvent.KEYCODE_VOLUME_DOWN:
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
return true;
default:
return false;
}
}

public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
//your code
return true;
} else if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
//your code
return true;
} else {
super.onKeyDown(keyCode, event);
}
return true;
}