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Android 10设置人脸解锁时，锁屏解锁图标不会显示人脸图标，若想显示人脸图标，可参考以下两点进行修改：

1.此处引用人脸图标资源，请参考如下修改：

diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/LockIcon.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/LockIcon.java

index a8c81e8..f72bcd8 100644

--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/LockIcon.java

+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/LockIcon.java

@@ -319,11 +319,15 @@ public class LockIcon extends KeyguardAffordanceView implements OnUserInfoChange

private int getIconForState(int state) {

int iconRes;

switch (state) {

+

+            case STATE_SCANNING_FACE:

+                // Error animation also starts and ands on the padlock.

+                iconRes = R.drawable.ic_face_unlock;

+                break;

case STATE_LOCKED:

// Scanning animation is a pulsing padlock. This means that the resting state is

// just a padlock.

-            case STATE_SCANNING_FACE:

-            // Error animation also starts and ands on the padlock.

+

case STATE_BIOMETRICS_ERROR:

iconRes = com.android.internal.R.drawable.ic_lock;

break;

2.人脸图标资源可从9.0移植或自行替换，将其放置\frameworks\base\packages\SystemUI\res\drawable\路径下即可。

此方案只有图标，并无类似9.0的图标动画。