直接上patch

commit ab21c0433523aa79de8a8136f51c8a1e2d03c298
Author: fjasmin <fjasmin@szmadigi.com>
Date:   Mon Feb 1 20:53:24 2021 +0800

    add power button in the Settings app option

diff --git a/packages/apps/Settings/AndroidManifest.xml b/packages/apps/Settings/AndroidManifest.xml
index 1fd87d4c39..fe72ada00d 100755
--- a/packages/apps/Settings/AndroidManifest.xml
+++ b/packages/apps/Settings/AndroidManifest.xml
@@ -571,6 +571,34 @@
                    android:value="true" />
 
         </activity>
+
+        <activity android:name="Settings$PoweroffActivity"
+                android:label="@string/poweroff"
+                android:icon="@drawable/ic_settings_security"
+                android:taskAffinity="">
+                
+            <intent-filter>
+           <action android:name="android.intent.action.MAIN" /> 
+           <category android:name="android.intent.category.DEFAULT" /> 
+           <category android:name="android.intent.category.VOICE_LAUNCH" /> 
+           <category android:name="com.android.settings.SHORTCUT" />
+            </intent-filter>
+            
+            <intent-filter>
+                <action android:name="com.android.settings.action.SETTINGS" />
+            </intent-filter>
+
+           <meta-data android:name="com.android.settings.category" 
+           android:value="com.android.settings.category.system" />
+
+            <meta-data android:name="com.android.settings.FRAGMENT_CLASS"
+                    android:value="com.android.settings.Poweroff" />
+
+           <meta-data android:name="com.android.settings.PRIMARY_PROFILE_CONTROLLED" 
+                   android:value="true" />
+
+        </activity>
+<!-- end -->
         
         <activity android:name="Settings$VpnSettingsActivity"
                 android:label="@string/vpn_settings_title"
diff --git a/packages/apps/Settings/res/values-zh-rTW/strings.xml b/packages/apps/Settings/res/values-zh-rTW/strings.xml
index 680a87aa24..ba1e790fd9 100755
--- a/packages/apps/Settings/res/values-zh-rTW/strings.xml
+++ b/packages/apps/Settings/res/values-zh-rTW/strings.xml
@@ -3278,6 +3278,7 @@
    <string name="timer_invalid_time">設置失敗，設置定時開關機時間間隔需要大於3秒</string>
    <string name="timer_invalid_setting">設置失敗，需要先設置定時關機時間</string>
     <string name="gotolauncher">返回桌面</string>
+    <string name="poweroff">關機</string>
     <string name="hide_statusbar_title">隱藏狀態欄</string>
     <string name="hide_navigationbar_title">隱藏導航欄</string>
     <string name="hide_lock_title">鎖定隱藏</string>    
diff --git a/packages/apps/Settings/res/values/strings.xml b/packages/apps/Settings/res/values/strings.xml
index 9a1f31cbf3..0a27bdf48e 100755
--- a/packages/apps/Settings/res/values/strings.xml
+++ b/packages/apps/Settings/res/values/strings.xml
@@ -30,6 +30,7 @@
    <string name="hide_navigationbar_title">Hide Navigation Bar</string>
    <string name="hide_lock_title">Lock Hide Mode</string>
    <string name="gotolauncher">Go to launcher3</string>
+   <string name="poweroff">Power Off</string>
    <string name="dpi_setting">Screen density</string>
     <!-- Strings for Dialog yes button -->
     <string name="yes">"Yes"</string>
diff --git a/packages/apps/Settings/src/com/android/settings/Poweroff.java b/packages/apps/Settings/src/com/android/settings/Poweroff.java
new file mode 100755
index 0000000000..ae7b82c28e
--- /dev/null
+++ b/packages/apps/Settings/src/com/android/settings/Poweroff.java
@@ -0,0 +1,51 @@
+package com.android.settings;

+

+import android.content.Context;

+import android.os.Build;

+import android.support.v7.preference.Preference;

+import android.support.v7.preference.PreferenceGroup;

+import com.android.settings.search.Indexable;

+import com.android.internal.logging.MetricsProto.MetricsEvent;

+import android.app.Activity;

+import android.content.ComponentName;

+import android.content.Intent;

+import android.os.Bundle;

+import android.util.Log;

+

+import android.support.v7.preference.CheckBoxPreference; 

+import android.support.v7.preference.ListPreference; 

+import android.support.v7.preference.Preference; 

+import android.support.v7.preference.PreferenceScreen; 

+import android.support.v7.preference.Preference.OnPreferenceChangeListener; 

+import android.provider.Settings; 

+

+import android.view.Gravity;

+import android.view.WindowManager;

+import android.view.ViewGroup.LayoutParams;

+import android.widget.TextView;

+import android.graphics.PixelFormat;

+import android.graphics.PorterDuff;

+import android.os.SystemProperties;

+import android.content.res.Resources;

+

+

+public class Poweroff extends SettingsPreferenceFragment 

+   implements Indexable {

+       @Override

+       public void onCreate(Bundle icicle){

+       super.onCreate(icicle);

+

+       Intent intent = new Intent();

+       intent.setAction("com.android.settings.poweroff");

+       getActivity().getApplicationContext().sendBroadcast(intent);

+

+       finish();

+       }

+

+       @Override

+       protected int getMetricsCategory() {

+       return MetricsEvent.DEVICEINFO;

+       }

+       

+}

+

diff --git a/packages/apps/Settings/src/com/android/settings/Settings.java b/packages/apps/Settings/src/com/android/settings/Settings.java
index 26a9f2657b..65fb3668fe 100755
--- a/packages/apps/Settings/src/com/android/settings/Settings.java
+++ b/packages/apps/Settings/src/com/android/settings/Settings.java
@@ -73,6 +73,7 @@ public class Settings extends SettingsActivity {
     public static class DevelopmentSettingsActivity extends SettingsActivity { /* empty */ }
     public static class AccessibilitySettingsActivity extends SettingsActivity { /* empty */ }
    public static class GotoLauncher3Activity extends SettingsActivity { /* empty */ }
+   public static class PoweroffActivity extends SettingsActivity { /* empty */ }
     public static class CaptioningSettingsActivity extends SettingsActivity { /* empty */ }
     public static class AccessibilityInversionSettingsActivity extends SettingsActivity { /* empty */ }
     public static class AccessibilityContrastSettingsActivity extends SettingsActivity { /* empty */ }
diff --git a/packages/apps/Settings/src/com/android/settings/SettingsActivity.java b/packages/apps/Settings/src/com/android/settings/SettingsActivity.java
index e7ee9ab8f0..9c8102005e 100755
--- a/packages/apps/Settings/src/com/android/settings/SettingsActivity.java
+++ b/packages/apps/Settings/src/com/android/settings/SettingsActivity.java
@@ -260,6 +260,7 @@ public class SettingsActivity extends SettingsDrawerActivity
             Settings.DeviceInfoSettingsActivity.class.getName(),
             Settings.AccessibilitySettingsActivity.class.getName(),
             Settings.GotoLauncher3Activity.class.getName(),
+            Settings.PoweroffActivity.class.getName(),
             Settings.PrintSettingsActivity.class.getName(),
             Settings.PaymentSettingsActivity.class.getName(),
            Settings.HdmiSettingsActivity.class.getName()
@@ -275,6 +276,7 @@ public class SettingsActivity extends SettingsDrawerActivity
             TetherSettings.class.getName(),
             WifiP2pSettings.class.getName(),
             GotoLauncher3.class.getName(),
+            Poweroff.class.getName(),
             VpnSettings.class.getName(),
             DateTimeSettings.class.getName(),
             LocaleListEditor.class.getName(),
@@ -1075,6 +1077,9 @@ public class SettingsActivity extends SettingsDrawerActivity
         setTileEnabled(new ComponentName(packageName,
                 Settings.GotoLauncher3Activity.class.getName()),
                 true, isAdmin, pm);
+        setTileEnabled(new ComponentName(packageName,
+                Settings.PoweroffActivity.class.getName()),
+                true, isAdmin, pm);
 
 
         setTileEnabled(new ComponentName(packageName,