Add camera extension fallback toggle

Android camera extensions
(https://source.android.com/docs/core/camera/camerax-vendor-extensions)
will be able to use SW fallback implementations
on devices that do not ship the corresponding
the device specific functionality.
Since the SW fallback will be using a new data
path, it was suggested that users must be able to
control and enable/disable the SW fallback
via the Settings app.

Bug: 297083874
Test: atest packages/apps/Settings/tests/unit/src/com/android/settings/privacy/CameraExtensionsFallbackPreferenceControllerTest.java

Change-Id: I1b97777babe1c9f4ea4f2f6ee3d8251fea11146e

res/values/strings.xml

@@ -12000,6 +12000,11 @@
     <!-- Keywords for the media controls setting [CHAR LIMIT=NONE]-->
     <string name="keywords_media_controls">media</string>
 
+    <!-- Title of toggle to enable or disable the media resumption on lockscreen [CHAR LIMIT=NONE]-->
+    <string name="camera_extensions_fallback_title">Allow camera software extensions</string>
+    <!-- Description of toggle to enable or disable the media resumption on lockscreen [CHAR LIMIT=NONE]-->
+    <string name="camera_extensions_fallback_description">Enables the default software implementation of advanced camera features, such as Eyes Free videography.</string>
+
     <!-- Summary for see all preference when bluetooth is disable [CHAR LIMIT=none]-->
     <string name="connected_device_see_all_summary">Bluetooth will turn on</string>
 

res/xml/more_security_privacy_settings.xml

@@ -93,6 +93,14 @@
             settings:controller=
                 "com.android.settings.sound.MediaControlsLockScreenPreferenceController" />
 
+        <!-- Allow software fallback for camera extensions -->
+        <SwitchPreference
+            android:key="privacy_camera_extensions_fallback"
+            android:title="@string/camera_extensions_fallback_title"
+            android:summary="@string/camera_extensions_fallback_description"
+            settings:controller=
+                "com.android.settings.privacy.CameraExtensionsFallbackPreferenceController" />
+
         <!-- Content Capture -->
         <!-- NOTE: content capture has a different preference, depending whether or not the
              ContentCaptureService implementations defines a custom settings activitiy on its manifest.

src/com/android/settings/privacy/CameraExtensionsFallbackPreferenceController.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.privacy;
+
+import static android.provider.Settings.Secure.CAMERA_EXTENSIONS_FALLBACK;
+
+import android.content.Context;
+import android.provider.Settings;
+
+import com.android.settings.R;
+import com.android.settings.core.TogglePreferenceController;
+
+/**
+ * Toggle for camera extensions software fallback
+ */
+public class CameraExtensionsFallbackPreferenceController extends TogglePreferenceController {
+    public CameraExtensionsFallbackPreferenceController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    public boolean isChecked() {
+        int val = Settings.Secure.getInt(mContext.getContentResolver(),
+                CAMERA_EXTENSIONS_FALLBACK, 1);
+        return val == 1;
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        int val = isChecked ? 1 : 0;
+        return Settings.Secure.putInt(mContext.getContentResolver(),
+                CAMERA_EXTENSIONS_FALLBACK, val);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public boolean isSliceable() {
+        return false;
+    }
+
+    @Override
+    public int getSliceHighlightMenuRes() {
+        // not needed since it's not sliceable
+        return NO_RES;
+    }
+}

tests/unit/src/com/android/settings/privacy/CameraExtensionsFallbackPreferenceControllerTest.java

@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.privacy;
+
+import static com.android.settings.core.BasePreferenceController.AVAILABLE;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.provider.Settings;
+
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import com.android.settings.privacy.CameraExtensionsFallbackPreferenceController;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+public class CameraExtensionsFallbackPreferenceControllerTest {
+
+    private static final String KEY = "camera_extensions_fallback";
+    private final Context mContext = ApplicationProvider.getApplicationContext();
+
+    private int mOriginalPreference;
+    private ContentResolver mContentResolver;
+    private CameraExtensionsFallbackPreferenceController mController;
+
+    @Before
+    public void setUp() {
+        mContentResolver = mContext.getContentResolver();
+        mOriginalPreference = Settings.Secure.getInt(mContentResolver,
+                Settings.Secure.CAMERA_EXTENSIONS_FALLBACK, 1);
+        mController = new CameraExtensionsFallbackPreferenceController(mContext, KEY);
+    }
+
+    @After
+    public void tearDown() {
+        Settings.Secure.putInt(mContentResolver, Settings.Secure.CAMERA_EXTENSIONS_FALLBACK,
+                mOriginalPreference);
+    }
+
+    @Test
+    public void getAvailability_returnAvailable() {
+        assertThat(mController.getAvailabilityStatus()).isEqualTo(AVAILABLE);
+    }
+
+    @Test
+    public void setChecked_disable_shouldTurnOff() {
+        Settings.Secure.putInt(mContentResolver,
+                Settings.Secure.CAMERA_EXTENSIONS_FALLBACK, 1);
+
+        assertThat(mController.isChecked()).isTrue();
+
+        mController.setChecked(false);
+
+        assertThat(Settings.Secure.getInt(mContentResolver,
+                Settings.Secure.CAMERA_EXTENSIONS_FALLBACK, -1)).isEqualTo(0);
+    }
+
+    @Test
+    public void setChecked_enable_shouldTurnOn() {
+        Settings.Secure.putInt(mContentResolver,
+                Settings.Secure.CAMERA_EXTENSIONS_FALLBACK, 0);
+
+        assertThat(mController.isChecked()).isFalse();
+
+        mController.setChecked(true);
+
+        assertThat(Settings.Secure.getInt(mContentResolver,
+                Settings.Secure.CAMERA_EXTENSIONS_FALLBACK, -1)).isEqualTo(1);
+    }
+}