I'd like to change the ringer volume during ringing. Code below sets it during ringing (it is changed in system settings) but it doesn't come to effect with actual ringing (only the next ring call will use new value). Can I force this changes to make them effect Immediately?
AudioManager audio = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
audio.setStreamVolume(AudioManager.STREAM_RING, volume, AudioManager.FLAG_ALLOW_RINGER_MODES | AudioManager.FLAG_PLAY_SOUND);
After some research and tests I've found that volume change is possible only in very early stage of incomming call detection. It's vital not to do much operations inside the onReceive() method.
public class CallReceiver extends BroadcastReceiver {
private boolean isRinging = false;
private boolean isInProgress = false;
private Listener mListener = null;
// interface declaration
public interface Listener {
public void onPhoneStateChange(boolean state);
}
// registration of listener
public void registerListener (Listener listener) {
mListener = listener;
}
@Override
public void onReceive(Context context, Intent intent) {
String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);
if(TelephonyManager.EXTRA_STATE_RINGING.equals(state)) {
// do something while ringing BUT NOT TOO MUCH!
isRinging = true;
if (context instanceof StateChecker)
((StateChecker) context).serviceDestroy();
Log.v("phone", "ringing");
}
else if(TelephonyManager.EXTRA_STATE_IDLE.equals(state)) {
//do something when the call ends
if (context instanceof StateChecker)
((StateChecker) context).serviceStart();
Log.v("phone", "idle");
isRinging = false;
}
// sending notification to listener
if(mListener != null) {
mListener.onPhoneStateChange(isRinging);
Log.v("listener", "notified");
}
}
}
and some code from service:
// listeners callbacks
public void onPhoneStateChange(boolean state) {
if (state) {
if (!callInProgress) {
// Do the main task here
callInProgress = true;
serviceDestroy();
}
} else {
callInProgress = false;
serviceStart();
}
}
ServiceStart:
// starting service
public void serviceStart() {
preferencesRead();
//The intent to launch when the user clicks the expanded notification
Intent intent = new Intent(this, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
PendingIntent pendIntent = PendingIntent.getActivity(this, 0, intent, 0);
if(settings.getBoolean("hide_noti_icon", false)) {
Notification noti = new NotificationCompat.Builder(this)
.setContentTitle("Intelligent Ringer")
.setContentText(getString(R.string.is_running))
.setSmallIcon(R.drawable.invisible)
.setContentIntent(pendIntent)
.setPriority(Notification.PRIORITY_MIN)
.build();
startForeground(12345, noti);
} else {
Notification noti = new NotificationCompat.Builder(this)
.setContentTitle("Intelligent Ringer")
.setContentText(getString(R.string.is_running))
.setSmallIcon(R.drawable.ic_launcher)
.setContentIntent(pendIntent)
.setPriority(Notification.PRIORITY_MIN)
.build();
startForeground(12345, noti);
}
Log.v("service", "started");
// registering listener for CallReceiver
if(isCRRegistered) {
unregisterReceiver(mCallReceiver);
isCRRegistered = false;
}
if(!isCRRegistered) {
IntentFilter filter2 = new IntentFilter("android.intent.action.PHONE_STATE");
filter2.addAction("android.intent.action.PHONE_STATE");
CallReceiver mCallReceiver = new CallReceiver();
this.mCallReceiver = mCallReceiver;
registerReceiver(mCallReceiver, filter2);
mCallReceiver.registerListener(this);
isCRRegistered = true;
}
if(isScreenRegistered) {
unregisterReceiver(mReceiver);
isScreenRegistered = false;
}
if(!isPositionRegistered && proximityOn) {
Position mPosition = new Position(this.getApplicationContext());
mPosition.registerListener(this);
mPosition.isInPocket();
this.mPosition = mPosition;
mPosition.register();
isPositionRegistered = true;
}
if(!isScreenRegistered) {
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
ScreenReceiver mReceiver = new ScreenReceiver();
registerReceiver(mReceiver, filter);
this.mReceiver = mReceiver;
mReceiver.registerListener(this);
isScreenRegistered = true;
}
}
Servicedestroy()
// stopping service
public void serviceDestroy() {
if (this.mPosition != null) {
this.mPosition.unregister();
}
Log.v("service", "Destroyed");
if(isScreenRegistered) {
unregisterReceiver(mReceiver);
isScreenRegistered = false;
}
}
OnDestroy()
public void onDestroy () {
serviceDestroy();
if(isCRRegistered) {
unregisterReceiver(mCallReceiver);
isCRRegistered = false;
}
}
来源：https://stackoverflow.com/questions/14429133/changing-ringer-volume-during-ringing