android检测按钮down up,如何在Android onMediaButtonEvent中收听“ ACTION_DOWN”（按键）事件，以测量时间？...

小编典典

我自己解决了这个问题。诀窍是使用 event.getDownTime() 以下示例对其进行解释：

audioSession = new MediaSession(getApplicationContext(), "TAG");

audioSession.setCallback(new MediaSession.Callback() {

@Override

public boolean onMediaButtonEvent(final Intent mediaButtonIntent) {

String intentAction = mediaButtonIntent.getAction();

if (Intent.ACTION_MEDIA_BUTTON.equals(intentAction)) {

KeyEvent event = mediaButtonIntent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);

if (event != null) {

stopTimeOfGame_millis = event.getDownTime();

double usersReactionTime = (event.getDownTime() - startTimeOfGame_millis) / 1000.0;

UtilsRG.info("event.getDownTime(): " + usersReactionTime);

double getEventTime = (event.getEventTime() - startTimeOfGame_millis) / 1000.0;

UtilsRG.info("event.getEventTime(): " + getEventTime);

int action = event.getAction();

if (action == KeyEvent.ACTION_DOWN) {

long action_down = android.os.SystemClock.uptimeMillis();

double actionDown = (action_down - startTimeOfGame_millis) / 1000.0;

UtilsRG.info("ACTION_DOWN: " + actionDown);

}

if (action == KeyEvent.ACTION_UP) {

long action_up = android.os.SystemClock.uptimeMillis();

double actionUp = (action_up - startTimeOfGame_millis) / 1000.0;

UtilsRG.info("ACTION_UP: " + actionUp);

}

}

}

return true;

}

});

PlaybackState state = new PlaybackState.Builder()

.setActions(PlaybackState.ACTION_PLAY_PAUSE)

.setState(PlaybackState.STATE_PLAYING, 0, 0, 0)

.build();

audioSession.setPlaybackState(state);

audioSession.setFlags(MediaSession.FLAG_HANDLES_MEDIA_BUTTONS | MediaSession.FLAG_HANDLES_TRANSPORT_CONTROLS);

audioSession.setActive(true);

我得到以下日志：

event.getDownTime()：0.281

event.getEventTime()：0.421

ACTION_DOWN：0.47

ACTION_UP：0.471

因此，现在我得到了用户按下按键的瞬间。

特别感谢Balkrishna Rawool

2020-09-28