javascript - 设备锁定时 devicemotion 似乎没有注册

Question

我有以下代码，当(移动)设备被轻微轻推时，它会发出蜂鸣声:

let audio = new Audio('ack.mp3');

function handleMotionEvent(event) {
  let x = event.accelerationIncludingGravity.x;
  let y = event.accelerationIncludingGravity.y;    

  if (Math.abs(x) + Math.abs(y) > 2.2) {
    audio.play();
  }
}

window.addEventListener("devicemotion", handleMotionEvent, true);

它工作正常，但当设备被锁定时根本不工作。有什么方法可以在设备锁定时检测到这一点？

Answer 1

似乎您必须为该操作获取部分唤醒锁。PowerManager 类。

PowerManager pm = (PowerManager)getSystemService(POWER_SERVICE);
PowerManager.WakeLock lock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,  "SensorRead");
lock.acquire();
window.addEventListener("devicemotion", handleMotionEvent, true);

您还需要 AndroidManifest.xml 中的此权限:

 <uses-permission android:name="android.permission.WAKE_LOCK" />

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