该功能在系统设置-显示-拿起设备时唤醒

alps\vendor\mediatek\proprietary\packages\apps\MtkSettings\src\com\android\settings\display\LiftToWakePreferenceController.java


public boolean isAvailable() {
    SensorManager sensors = (SensorManager) mContext.getSystemService(Context.SENSOR_SERVICE);
    return sensors != null && sensors.getDefaultSensor(Sensor.TYPE_WAKE_GESTURE) != null;
}

 通过以上代码可以控制该功能是不是在设置中显示，也可以看出来用到的sensor是Sensor.TYPE_WAKE_GESTURE，当然这个sensor是需要驱动配置好之后，上层才可以正常的控制该功能的开启和关闭。

alps\frameworks\base\core\java\android\hardware\SensorManager.java

public Sensor getDefaultSensor(int type) {
    // TODO: need to be smarter, for now, just return the 1st sensor
    List<Sensor> l = getSensorList(type);
    boolean wakeUpSensor = false;
    // For the following sensor types, return a wake-up sensor. These types are by default
    // defined as wake-up sensors. For the rest of the SDK defined sensor types return a
    // non_wake-up version.
    if (type == Sensor.TYPE_PROXIMITY || type == Sensor.TYPE_SIGNIFICANT_MOTION
            || type == Sensor.TYPE_TILT_DETECTOR || type == Sensor.TYPE_WAKE_GESTURE
            || type == Sensor.TYPE_GLANCE_GESTURE || type == Sensor.TYPE_PICK_UP_GESTURE
            || type == Sensor.TYPE_LOW_LATENCY_OFFBODY_DETECT
            || type == Sensor.TYPE_WRIST_TILT_GESTURE
            || type == Sensor.TYPE_DYNAMIC_SENSOR_META || type == Sensor.TYPE_HINGE_ANGLE) {
        wakeUpSensor = true;
    }
    for (Sensor sensor : l) {
        if (sensor.isWakeUpSensor() == wakeUpSensor) return sensor;
    }
    return null;
}

alps\frameworks\base\services\core\java\com\android\server\policy\WakeGestureListener.java

public abstract void onWakeUp();

public boolean isSupported() {
    synchronized (mLock) {
        return mSensor != null;
    }
}

public void requestWakeUpTrigger() {
    synchronized (mLock) {
        if (mSensor != null && !mTriggerRequested) {
            mTriggerRequested = true;
            mSensorManager.requestTriggerSensor(mListener, mSensor);
        }
    }
}

public void cancelWakeUpTrigger() {
    synchronized (mLock) {
        if (mSensor != null && mTriggerRequested) {
            mTriggerRequested = false;
            mSensorManager.cancelTriggerSensor(mListener, mSensor);
        }
    }
}

alps\frameworks\base\services\core\java\com\android\server\policy\PhoneWindowManager.java

class MyWakeGestureListener extends WakeGestureListener {
    MyWakeGestureListener(Context context, Handler handler) {
        super(context, handler);
    }
    @Override
    public void onWakeUp() {
        synchronized (mLock) {
            if (shouldEnableWakeGestureLp()) {
                performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY, false,
                        "Wake Up");
                wakeUp(SystemClock.uptimeMillis(), mAllowTheaterModeWakeFromWakeGesture,
                        PowerManager.WAKE_REASON_GESTURE, "android.policy:GESTURE");
            }
        }
    }
}

关键的方法是onWakeUp（），这个方法就是抬手的动作触发的操作，如果我们要在抬手的时候处理一些事情，那么可以在这个方法里面操作。

@Override
public void onWakeUp() {
    synchronized (mLock) {
        if (shouldEnableWakeGestureLp()) {
            performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY, false,
                    "Wake Up");
            wakeUp(SystemClock.uptimeMillis(), mAllowTheaterModeWakeFromWakeGesture,
                    PowerManager.WAKE_REASON_GESTURE, "android.policy:GESTURE");
        }
        // Add on 2023/4/10 for  start
        if ((SystemProperties.getInt("ro.xxx_support", 0) == 1
                || SystemProperties.getInt("ro.xxx_support", 0) == 1)
                && Settings.Global.getInt(mContext.getContentResolver(), Settings.Global.LIFT_ON, 1) == 1) {
            Log.d("HZH", "PhoneWindowManager MyWakeGestureListener onWakeUp 890: open vicescreen");
            Intent intent = new Intent();
            intent.setComponent(new ComponentName("com.xxx.xxx", "com.xxx.xxx.XService"));
            intent.putExtra("broadcast_type", 109);
            mContext.startForegroundService(intent);
        }
        // Add  on 2023/4/10 for  end
    }
}

l流程比较简单，主要是给大家提供一个思路，如果有抬手相关的需求的时候，相信是会有帮助的