将内容复制到剪贴板
代码:SensorEventListener mProximityListener = new SensorEventListener() {
public void onSensorChanged(SensorEvent event) {
long milliseconds = SystemClock.elapsedRealtime();
synchronized (mLocks) {
float distance = event.values[0];///检测手机与人体的距离
long timeSinceLastEvent = milliseconds - mLastProximityEventTime;///这次测试与上次测试的时差
mLastProximityEventTime = milliseconds;////更新上次测试的时间
mHandler.removeCallbacks(mProximityTask);
boolean proximityTaskQueued = false;
// compare against getMaximumRange to support sensors that only return 0 or 1
boolean active = (distance >= 0.0 && distance < PROXIMITY_THRESHOLD &&
distance < mProximitySensor.getMaximumRange());//如果距离小于一定距离阈值，默认为5.0f，说明手机和脸靠近，屏幕要熄灭。
if (mDebugProximitySensor) {
Slog.d(TAG, "mProximityListener.onSensorChanged active: " active);
}
if (timeSinceLastEvent < PROXIMITY_SENSOR_DELAY) {
// enforce delaying atleast PROXIMITY_SENSOR_DELAY before processing
mProximityPendingValue = (active ? 1 : 0);
mHandler.postDelayed(mProximityTask, PROXIMITY_SENSOR_DELAY - timeSinceLastEvent);
proximityTaskQueued = true;
} else {
// process the value immediately
mProximityPendingValue = -1;
proximityChangedLocked(active); ///熄灭屏幕操作
}
// update mProximityPartialLock state
boolean held = mProximityPartialLock.isHeld();
if (!held && proximityTaskQueued) {
// hold wakelock until mProximityTask runs
mProximityPartialLock.acquire();
} else if (held && !proximityTaskQueued) {
mProximityPartialLock.release();
}
}
}
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// ignore
}
};