I'm playing with Equalizer
and found that whenever I'm starting my application and then using another equalizer app my app crashes on attempt to use anything (e.g. setBandLevel
).
java.lang.UnsupportedOperationException: AudioEffect: invalid parameter operation at android.media.audiofx.AudioEffect.checkStatus(AudioEffect.java:1244) at android.media.audiofx.Equalizer.setBandLevel(Equalizer.java:230)
I'm listening to the onControlStatusChange
and I have information that my app lost control over the effect. How can I reclaim it back in onResume
?
I assume I could clear effect instance (release then nullify) and instantiate the effect class again v(like in code example below), but was wondering if there is something like setControlState(true)
built in functionality.
@Override
protected void onResume() {
super.onResume();
if (mEqualizer.hasControl() == false) {
prepareEqualizer();//force re-gaining control
}
}
private void prepareEqualizer() {
if (mEqualizer != null) {
releaseEqualizer();
}
mEqualizer = new Equalizer(0, 0);
mEqualizer.setEnabled(true);
mEqualizer.setControlStatusListener(this);
mEqualizer.setEnableStatusListener(this);
mEqualizer.setParameterListener(this);
mMaxBands = mEqualizer.getNumberOfBands();
mGainLevels = mEqualizer.getBandLevelRange();
}
private void releaseEqualizer() {
if (mEqualizer == null)
return;
mEqualizer.setControlStatusListener(null);
mEqualizer.setEnableStatusListener(null);
mEqualizer.setParameterListener(null);
mEqualizer.release();
mEqualizer = null;
}
The short answer is: you can't, but it works with code I've already posted in teh question:
@Override
protected void onResume() {
super.onResume();
if (mEqualizer.hasControl() == false) {
prepareEqualizer();//force re-gaining control
}
}
private void prepareEqualizer() {
if (mEqualizer != null) {
releaseEqualizer();
}
mEqualizer = new Equalizer(0, 0);
mEqualizer.setEnabled(true);
mEqualizer.setControlStatusListener(this);
mEqualizer.setEnableStatusListener(this);
mEqualizer.setParameterListener(this);
mMaxBands = mEqualizer.getNumberOfBands();
mGainLevels = mEqualizer.getBandLevelRange();
}
private void releaseEqualizer() {
if (mEqualizer == null)
return;
mEqualizer.setControlStatusListener(null);
mEqualizer.setEnableStatusListener(null);
mEqualizer.setParameterListener(null);
mEqualizer.release();
mEqualizer = null;
}