反应本机:按下音量按钮(不用于音量调节)

Question

如何检测iOS/Android上是否按下了+或-按钮？

Answer 1

我认为这对iOS很有帮助。

 - (void)viewWillAppear:(BOOL)animated {
        AVAudioSession* audioSession = [AVAudioSession sharedInstance];
        [audioSession setActive:YES error:nil];
        [audioSession addObserver:self
                       forKeyPath:@"outputVolume"
                          options:0
                          context:nil];
    }
    -(void) observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
        if ([keyPath isEqual:@"outputVolume"]) {
            NSLog(@"volume changed");
        }
    }

和安卓。

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
    int action = event.getAction();
    int keyCode = event.getKeyCode();
        switch (keyCode) {
        case KeyEvent.KEYCODE_VOLUME_UP:
            if (action == KeyEvent.ACTION_DOWN) {
                //TODO
            }
            return true;
        case KeyEvent.KEYCODE_VOLUME_DOWN:
            if (action == KeyEvent.ACTION_DOWN) {
                //TODO
            }
            return true;
        default:
            return super.dispatchKeyEvent(event);
        }
    }