From 448db3a8944f2e688cec1ba76c0ed3158348fe81 Mon Sep 17 00:00:00 2001
From: Patrick Huang <pinchin@google.com>
Date: Sat, 5 Mar 2022 02:50:43 +0000
Subject: [PATCH] Hide lockscreen Emergency button if device lacks telephony

Emergency calling requires a telephony radio.

Bug: 220435157
Fix: 220435157
Test: Manual test on phone and tablet
Change-Id: I7086caf39bf03dc385062defb3e912b4457f41e5
---
 .../SystemUI/src/com/android/keyguard/EmergencyButton.java  | 6 +++---
 .../src/com/android/keyguard/EmergencyButtonController.java | 4 +++-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/packages/SystemUI/src/com/android/keyguard/EmergencyButton.java b/packages/SystemUI/src/com/android/keyguard/EmergencyButton.java
index c4b02f62f2914..ffd15460ce91d 100644
--- a/packages/SystemUI/src/com/android/keyguard/EmergencyButton.java
+++ b/packages/SystemUI/src/com/android/keyguard/EmergencyButton.java
@@ -107,10 +107,10 @@ public class EmergencyButton extends Button {
         return super.performLongClick();
     }
 
-    void updateEmergencyCallButton(boolean isInCall, boolean isVoiceCapable, boolean simLocked) {
+    void updateEmergencyCallButton(boolean isInCall, boolean hasTelephonyRadio, boolean simLocked) {
         boolean visible = false;
-        if (isVoiceCapable) {
-            // Emergency calling requires voice capability.
+        if (hasTelephonyRadio) {
+            // Emergency calling requires a telephony radio.
             if (isInCall) {
                 visible = true; // always show "return to call" if phone is off-hook
             } else {
diff --git a/packages/SystemUI/src/com/android/keyguard/EmergencyButtonController.java b/packages/SystemUI/src/com/android/keyguard/EmergencyButtonController.java
index e7215b8ebe49a..f28910576073f 100644
--- a/packages/SystemUI/src/com/android/keyguard/EmergencyButtonController.java
+++ b/packages/SystemUI/src/com/android/keyguard/EmergencyButtonController.java
@@ -21,6 +21,7 @@ import static com.android.systemui.DejankUtils.whitelistIpcs;
 import android.app.ActivityOptions;
 import android.app.ActivityTaskManager;
 import android.content.Intent;
+import android.content.pm.PackageManager;
 import android.content.res.Configuration;
 import android.os.PowerManager;
 import android.os.SystemClock;
@@ -116,7 +117,8 @@ public class EmergencyButtonController extends ViewController<EmergencyButton> {
         if (mView != null) {
             mView.updateEmergencyCallButton(
                     mTelecomManager != null && mTelecomManager.isInCall(),
-                    mTelephonyManager.isVoiceCapable(),
+                    getContext().getPackageManager().hasSystemFeature(
+                            PackageManager.FEATURE_TELEPHONY),
                     mKeyguardUpdateMonitor.isSimPinVoiceSecure());
         }
     }