Add observer to autoclick main switch controller

Add an observer in ToggleAutoclickMainSwitchPreferenceController
so when the autoclick is toggled on/off at somewhere else such as
autoclick shortcut, the main switch will change accordingly.

screen cast:
go/screencast-njawnjqynzi2ode1mzm0nhxmztqwmddjzc03oa

Bug: 391416057
Test: verified manually
Flag: com.android.server.accessibility.enable_autoclick_indicator
Change-Id: I6e2a3af55cbd3f03b4feeb268b84510fc55518bf

src/com/android/settings/accessibility/ToggleAutoclickMainSwitchPreferenceController.java

@@ -21,9 +21,19 @@ import static com.android.settings.accessibility.AccessibilityUtil.State.ON;
 
 import android.content.ContentResolver;
 import android.content.Context;
+import android.database.ContentObserver;
+import android.net.Uri;
+import android.os.Handler;
+import android.os.Looper;
 import android.provider.Settings;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
+import androidx.lifecycle.DefaultLifecycleObserver;
+import androidx.lifecycle.LifecycleOwner;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
 
 import com.android.server.accessibility.Flags;
 import com.android.settings.R;
@@ -31,9 +41,24 @@ import com.android.settings.core.TogglePreferenceController;
 
 /** The controller to handle main switch to turn on or turn off accessibility autoclick. */
 public class ToggleAutoclickMainSwitchPreferenceController
-        extends TogglePreferenceController {
+        extends TogglePreferenceController implements DefaultLifecycleObserver {
 
+    static final Uri ACCESSIBILITY_AUTOCLICK_ENABLED_URI =
+            Settings.Secure.getUriFor(Settings.Secure.ACCESSIBILITY_AUTOCLICK_ENABLED);
     private final ContentResolver mContentResolver;
+    private @Nullable Preference mPreference;
+
+    @VisibleForTesting
+    final ContentObserver mSettingsObserver =
+            new ContentObserver(new Handler(Looper.getMainLooper())) {
+                @Override
+                public void onChange(boolean selfChange, @Nullable Uri uri) {
+                    if (mPreference == null || uri == null) {
+                        return;
+                    }
+                    updateState(mPreference);
+                }
+            };
 
     public ToggleAutoclickMainSwitchPreferenceController(
             @NonNull Context context, @NonNull String preferenceKey) {
@@ -46,6 +71,12 @@ public class ToggleAutoclickMainSwitchPreferenceController
         return Flags.enableAutoclickIndicator() ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
     }
 
+    @Override
+    public void displayPreference(@NonNull PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mPreference = screen.findPreference(getPreferenceKey());
+    }
+
     @Override
     public boolean isChecked() {
         return Settings.Secure.getInt(mContentResolver,
@@ -61,6 +92,19 @@ public class ToggleAutoclickMainSwitchPreferenceController
         return true;
     }
 
+    @Override
+    public void onStart(@NonNull LifecycleOwner owner) {
+        mContentResolver.registerContentObserver(
+                ACCESSIBILITY_AUTOCLICK_ENABLED_URI,
+                /* notifyForDescendants= */ false,
+                mSettingsObserver);
+    }
+
+    @Override
+    public void onStop(@NonNull LifecycleOwner owner) {
+        mContentResolver.unregisterContentObserver(mSettingsObserver);
+    }
+
     @Override
     public int getSliceHighlightMenuRes() {
         return R.string.menu_key_system;

tests/robotests/src/com/android/settings/accessibility/ToggleAutoclickMainSwitchPreferenceControllerTest.java

@@ -16,6 +16,9 @@
 
 package com.android.settings.accessibility;
 
+import static androidx.lifecycle.Lifecycle.Event.ON_START;
+import static androidx.lifecycle.Lifecycle.Event.ON_STOP;
+
 import static com.android.settings.accessibility.AccessibilityUtil.State.OFF;
 import static com.android.settings.accessibility.AccessibilityUtil.State.ON;
 
@@ -26,15 +29,19 @@ import android.platform.test.annotations.EnableFlags;
 import android.platform.test.flag.junit.SetFlagsRule;
 import android.provider.Settings;
 
+import androidx.lifecycle.LifecycleOwner;
 import androidx.test.core.app.ApplicationProvider;
 
 import com.android.settings.core.BasePreferenceController;
+import com.android.settingslib.core.lifecycle.Lifecycle;
 
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.robolectric.RobolectricTestRunner;
+import org.robolectric.shadow.api.Shadow;
+import org.robolectric.shadows.ShadowContentResolver;
 
 @RunWith(RobolectricTestRunner.class)
 public class ToggleAutoclickMainSwitchPreferenceControllerTest {
@@ -43,11 +50,20 @@ public class ToggleAutoclickMainSwitchPreferenceControllerTest {
 
     @Rule public final SetFlagsRule mSetFlagsRule = new SetFlagsRule();
     private final Context mContext = ApplicationProvider.getApplicationContext();
+
+    private ShadowContentResolver mShadowContentResolver;
     private ToggleAutoclickMainSwitchPreferenceController mController;
+    private LifecycleOwner mLifecycleOwner;
+    private Lifecycle mLifecycle;
 
     @Before
     public void setUp() {
+        mShadowContentResolver = Shadow.extract(mContext.getContentResolver());
+
         mController = new ToggleAutoclickMainSwitchPreferenceController(mContext, PREFERENCE_KEY);
+        mLifecycleOwner = () -> mLifecycle;
+        mLifecycle = new Lifecycle(mLifecycleOwner);
+        mLifecycle.addObserver(mController);
     }
 
     @Test
@@ -80,4 +96,23 @@ public class ToggleAutoclickMainSwitchPreferenceControllerTest {
                 Settings.Secure.ACCESSIBILITY_AUTOCLICK_ENABLED, OFF))
                 .isEqualTo(OFF);
     }
+
+    @Test
+    public void onStart_shouldRegisterContentObserver() {
+        mLifecycle.handleLifecycleEvent(ON_START);
+
+        assertThat(mShadowContentResolver.getContentObservers(
+                Settings.Secure.getUriFor(Settings.Secure.ACCESSIBILITY_AUTOCLICK_ENABLED)))
+                .hasSize(1);
+    }
+
+    @Test
+    public void onStop_shouldUnregisterContentObserver() {
+        mLifecycle.handleLifecycleEvent(ON_START);
+        mLifecycle.handleLifecycleEvent(ON_STOP);
+
+        assertThat(mShadowContentResolver.getContentObservers(
+                Settings.Secure.getUriFor(Settings.Secure.ACCESSIBILITY_AUTOCLICK_ENABLED)))
+                .isEmpty();
+    }
 }