Fix FOD for HyperOS on Transsion Devices (non-AIDL)

Overview

This document describes the required SystemUI, framework, and vendor modifications to restore Fingerprint-on-Display (FOD) functionality on HyperOS for Transsion devices using non-AIDL fingerprint stacks.

The procedure consists of:

Patching SystemUI.apk
Adding a custom receiver for FOD HBM Layer handling
Patching vendor binaries
Forcing fingerprint hardware detection if the UI option is missing

SystemUI Patch

Target Class

com.miui.keyguard.biometrics.fod.MiuiGxzwIconView

1. Add Field

At the top of the class, add:

.field public mRianixiaReceiver:Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView$RianixiaReceiver;

2. Replace `dismissGxzwIconView`

Completely replace the method with the following implementation:

.method public final dismissGxzwIconView(Z)V
    .registers 6

    sget-boolean v0, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwUtils;->GXZW_LOWLIGHT_SENSOR:Z
    if-eqz v0, :cond_1b

    invoke-virtual {p0}, Landroid/widget/FrameLayout;->getContext()Landroid/content/Context;

    sget-boolean v0, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwUtils;->SUPPORT_NO_TOUCH_MODE:Z
    if-nez v0, :cond_1b

    const-class v0, Lcom/miui/systemui/MiuiUiOffloadThread;
    invoke-static {v0}, Lcom/miui/systemui/MiuiDependency;->get(Ljava/lang/Class;)Ljava/lang/Object;
    move-result-object v0
    check-cast v0, Lcom/miui/systemui/MiuiUiOffloadThread;

    new-instance v1, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView$$ExternalSyntheticLambda1;
    invoke-direct {v1, p1}, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView$$ExternalSyntheticLambda1;-><init>(Z)V
    invoke-virtual {v0, v1}, Lcom/miui/systemui/MiuiUiOffloadThread;->execute(Ljava/lang/Runnable;)V

    :cond_1b
    const/4 v0, 0x0
    const/16 v1, 0x8

    iget-object v3, p0, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView;->mRianixiaReceiver:Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView$RianixiaReceiver;
    if-eqz v3, :cond_25
    invoke-virtual {v3}, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView$RianixiaReceiver;->removeHbmOverlay()V

    :cond_25
    if-eqz p1, :cond_29
    move v2, v1
    goto :goto_2a

    :cond_29
    move v2, v0

    :goto_2a
    invoke-virtual {p0, v2}, Landroid/widget/FrameLayout;->setVisibility(I)V

    iget-object v2, p0, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView;->mHighlightView:Lcom/miui/keyguard/biometrics/fod/MiuiGxzwHightlightContainer;
    if-eqz v2, :cond_39
    if-eqz p1, :cond_35
    move v3, v1
    goto :goto_36

    :cond_35
    move v3, v0

    :goto_36
    invoke-virtual {v2, v3}, Landroid/widget/FrameLayout;->setVisibility(I)V

    :cond_39
    iget-object v2, p0, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView;->mMiuiGxzwAnimView:Lcom/miui/keyguard/biometrics/fod/MiuiGxzwAnimView;
    if-eqz p1, :cond_3e
    move v0, v1

    :cond_3e
    iget-object p1, v2, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwAnimView;->mMainHandler:Landroid/os/Handler;
    new-instance v1, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwAnimView$$ExternalSyntheticLambda16;
    invoke-direct {v1, v2, v0}, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwAnimView$$ExternalSyntheticLambda16;-><init>(Lcom/miui/keyguard/biometrics/fod/MiuiGxzwAnimView;I)V
    invoke-virtual {p1, v1}, Landroid/os/Handler;->post(Ljava/lang/Runnable;)Z

    iget-object p0, p0, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView;->mMiuiGxzwAnimView:Lcom/miui/keyguard/biometrics/fod/MiuiGxzwAnimView;
    iget-object p1, p0, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwAnimView;->mMainHandler:Landroid/os/Handler;
    new-instance v0, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwAnimView$$ExternalSyntheticLambda0;
    const/4 v1, 0x7
    invoke-direct {v0, p0, v1}, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwAnimView$$ExternalSyntheticLambda0;-><init>(Lcom/miui/keyguard/biometrics/fod/MiuiGxzwAnimView;I)V
    invoke-virtual {p1, v0}, Landroid/os/Handler;->post(Ljava/lang/Runnable;)Z

    return-void
.end method

3. Replace `onAttachedToWindow`

.method public final onAttachedToWindow()V
    .registers 4

    invoke-super {p0}, Lcom/miui/keyguard/biometrics/fod/GxzwWindowFrameLayout;->onAttachedToWindow()V
    invoke-virtual {p0, p0}, Landroid/widget/FrameLayout;->setOnTouchListener(Landroid/view/View$OnTouchListener;)V

    new-instance v0, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView$RianixiaReceiver;
    invoke-direct {v0, p0}, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView$RianixiaReceiver;-><init>(Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView;)V
    iput-object v0, p0, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView;->mRianixiaReceiver:Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView$RianixiaReceiver;

    new-instance v1, Landroid/content/IntentFilter;
    invoke-direct {v1}, Landroid/content/IntentFilter;-><init>()V

    const-string v2, "com.rianixia.FINGER_DOWN"
    invoke-virtual {v1, v2}, Landroid/content/IntentFilter;->addAction(Ljava/lang/String;)V

    const-string v2, "com.rianixia.FINGER_UP"
    invoke-virtual {v1, v2}, Landroid/content/IntentFilter;->addAction(Ljava/lang/String;)V

    invoke-virtual {p0}, Landroid/widget/FrameLayout;->getContext()Landroid/content/Context;
    move-result-object v2
    iget-object v0, p0, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView;->mRianixiaReceiver:Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView$RianixiaReceiver;
    invoke-virtual {v2, v0, v1}, Landroid/content/Context;->registerReceiver(Landroid/content/BroadcastReceiver;Landroid/content/IntentFilter;)Landroid/content/Intent;

    return-void
.end method

4. Replace `onDetachedFromWindow`

.method public final onDetachedFromWindow()V
    .registers 3

    invoke-super {p0}, Lcom/miui/keyguard/biometrics/fod/GxzwWindowFrameLayout;->onDetachedFromWindow()V

    const/4 v0, 0x0
    invoke-virtual {p0, v0}, Landroid/widget/FrameLayout;->setOnTouchListener(Landroid/view/View$OnTouchListener;)V

    iget-object v0, p0, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView;->mRianixiaReceiver:Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView$RianixiaReceiver;
    if-eqz v0, :cond_18

    invoke-virtual {v0}, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView$RianixiaReceiver;->removeHbmOverlay()V

    invoke-virtual {p0}, Landroid/widget/FrameLayout;->getContext()Landroid/content/Context;
    move-result-object v1
    invoke-virtual {v1, v0}, Landroid/content/Context;->unregisterReceiver(Landroid/content/BroadcastReceiver;)V

    const/4 v0, 0x0
    iput-object v0, p0, Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView;->mRianixiaReceiver:Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView$RianixiaReceiver;

    :cond_18
    return-void
.end method

5. Add New Class

Add the following class to SystemUI:

Lcom/miui/keyguard/biometrics/fod/MiuiGxzwIconView$RianixiaReceiver;

Vendor Patch

Copy the provided vendor blobs
Patch SELinux context to fingerprint_default_exec
Ensure the service executes correctly under vendor partition

Fingerprint Option Not Showing

If the fingerprint option does not appear:

Run in permissive mode or
Patch services.jar

Target Class

com.android.server.biometrics.sensors.fingerprint.FingerprintService$1

Replace Both Methods

.method public isHardwareDetected(ILjava/lang/String;)Z
    .registers 8
    const/4 v1, 0x1
    return v1
.end method

.method public isHardwareDetectedDeprecated(Ljava/lang/String;Ljava/lang/String;)Z
    .registers 10
    const/4 v1, 0x1
    return v1
.end method

Final Step

Import Transsion AOSP FOD HALs. (Provided in the Repo)
Patch hwcomposer.* under /vendor/lib64/hw/.

Example:

perl -pi -e 's/OnScreenFingerprintDimLayer/VRI[RianixiaHBMController]\x00/g' /vendor/lib64/hw/hwcomposer.mt6893.so

Fod Props

persist.vendor.sys.fp.fod.location.X_Y=380,2018
persist.vendor.sys.fp.fod.size.width_height=320,320
ro.hardware.fp.fod=true
ro.hardware.fp.fod.location=low
ro.hardware.fp.fod.touch.ctl.version=2.0
ro.vendor.display.fod_monitor_default_fps=120
ro.optical_fingerprint_support=1
persist.vendor.fingerprint.sensor_modules=goodix
persist.vendor.fingerprint.sensor_type=optical
persist.vendor.fingerprint.type=optical

Notes

Tested with Goodix FOD only
Other fingerprint types are unverified
Tested in HyperOS 2
Might need slight changes for HyperOS 1 or 3

Credits

irawansalt & fajarxtr — Transsion AOSP FOD HALs
@ryanistr (GitHub) / @rianixia (Telegram) — HyperOS FOD implementation

Name		Name	Last commit message	Last commit date
Latest commit History 4 Commits
SystemUI/com/miui/keyguard/biometrics/fod		SystemUI/com/miui/keyguard/biometrics/fod
vendor		vendor
README.md		README.md

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Fix FOD for HyperOS on Transsion Devices (non-AIDL)

Overview

SystemUI Patch

Target Class

1. Add Field

2. Replace `dismissGxzwIconView`

3. Replace `onAttachedToWindow`

4. Replace `onDetachedFromWindow`

5. Add New Class

Vendor Patch

Fingerprint Option Not Showing

Target Class

Replace Both Methods

Final Step

Notes

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Fix FOD for HyperOS on Transsion Devices (non-AIDL)

Overview

SystemUI Patch

Target Class

1. Add Field

2. Replace dismissGxzwIconView

3. Replace onAttachedToWindow

4. Replace onDetachedFromWindow

5. Add New Class

Vendor Patch

Fingerprint Option Not Showing

Target Class

Replace Both Methods

Final Step

Notes

Credits

About

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2. Replace `dismissGxzwIconView`

3. Replace `onAttachedToWindow`

4. Replace `onDetachedFromWindow`

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