Improve the UI of Press & hold power button settings

The following changes has been made:
- The on/off toggle for Assistant now becomes two radio selectors ("Power Menu" and "Digital Assistant"). This is to make things clearer that Press & hold power button can be configured to power menu.
- The corresponding power menu animation will be shown when "Power Menu" is selected.
- The Assistant specific sensitivity settings and the foot notes are hidden when "Power Menu" is selected.
- Some minor wording updates according to the requests from Assistant / Settings UXW.

Bug: 229722937
Test: robotest, manual
Change-Id: Ib356fba861ad8c4a2626a0e0bd8cf3e4d90ce9a6

src/com/android/settings/gestures/LongPressPowerSensitivityPreferenceController.java

@@ -17,37 +17,28 @@
 package com.android.settings.gestures;
 
 import android.content.Context;
-import android.database.ContentObserver;
-import android.os.Handler;
+import android.net.Uri;
 import android.provider.Settings;
 
 import androidx.annotation.Nullable;
+import androidx.lifecycle.Lifecycle;
+import androidx.lifecycle.LifecycleObserver;
+import androidx.lifecycle.OnLifecycleEvent;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceScreen;
 
 import com.android.settings.core.SliderPreferenceController;
 import com.android.settings.widget.LabeledSeekBarPreference;
-import com.android.settingslib.core.lifecycle.LifecycleObserver;
-import com.android.settingslib.core.lifecycle.events.OnStart;
-import com.android.settingslib.core.lifecycle.events.OnStop;
 
 /** Handles changes to the long press power button sensitivity slider. */
-public class LongPressPowerSensitivityPreferenceController extends
-        SliderPreferenceController implements
-        LifecycleObserver, OnStart, OnStop {
-
-    private final ContentObserver mPowerButtonObserver = new ContentObserver(Handler.getMain()) {
-        @Override
-        public void onChange(boolean selfChange) {
-            if (mPreference != null) {
-                updateState(mPreference);
-            }
-        }
-    };
+public class LongPressPowerSensitivityPreferenceController extends SliderPreferenceController
+        implements PowerMenuSettingsUtils.SettingsStateCallback, LifecycleObserver {
 
     @Nullable
     private final int[] mSensitivityValues;
 
+    private final PowerMenuSettingsUtils mUtils;
+
     @Nullable
     private LabeledSeekBarPreference mPreference;
 
@@ -55,18 +46,19 @@ public class LongPressPowerSensitivityPreferenceController extends
         super(context, preferenceKey);
         mSensitivityValues = context.getResources().getIntArray(
                 com.android.internal.R.array.config_longPressOnPowerDurationSettings);
+        mUtils = new PowerMenuSettingsUtils(context);
     }
 
-    @Override
+    /** @OnLifecycleEvent(Lifecycle.Event.ON_START) */
+    @OnLifecycleEvent(Lifecycle.Event.ON_START)
     public void onStart() {
-        mContext.getContentResolver().registerContentObserver(
-                Settings.Global.getUriFor(PowerMenuSettingsUtils.POWER_BUTTON_LONG_PRESS_SETTING),
-                false, mPowerButtonObserver);
+        mUtils.registerObserver(this);
     }
 
-    @Override
+    /** @OnLifecycleEvent(Lifecycle.Event.ON_STOP) */
+    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
     public void onStop() {
-        mContext.getContentResolver().unregisterContentObserver(mPowerButtonObserver);
+        mUtils.unregisterObserver();
     }
 
     @Override
@@ -86,21 +78,19 @@ public class LongPressPowerSensitivityPreferenceController extends
     public void updateState(Preference preference) {
         super.updateState(preference);
         final LabeledSeekBarPreference pref = (LabeledSeekBarPreference) preference;
-        pref.setEnabled(
-                isAvailable() && PowerMenuSettingsUtils.isLongPressPowerForAssistEnabled(mContext));
+        pref.setVisible(
+                PowerMenuSettingsUtils.isLongPressPowerForAssistantEnabled(mContext)
+                        && getAvailabilityStatus() == AVAILABLE);
         pref.setProgress(getSliderPosition());
     }
 
     @Override
     public int getAvailabilityStatus() {
-        if (mSensitivityValues == null || mSensitivityValues.length < 2) {
+        if (mSensitivityValues == null
+                || mSensitivityValues.length < 2
+                || !PowerMenuSettingsUtils.isLongPressPowerSettingAvailable(mContext)) {
             return UNSUPPORTED_ON_DEVICE;
         }
-
-        if (!PowerMenuSettingsUtils.isLongPressPowerForAssistEnabled(mContext)) {
-            return DISABLED_DEPENDENT_SETTING;
-        }
-
         return AVAILABLE;
     }
 
@@ -120,6 +110,13 @@ public class LongPressPowerSensitivityPreferenceController extends
                 mSensitivityValues[position]);
     }
 
+    @Override
+    public void onChange(Uri uri) {
+        if (mPreference != null) {
+            updateState(mPreference);
+        }
+    }
+
     @Override
     public int getMax() {
         if (mSensitivityValues == null || mSensitivityValues.length == 0) {