Make the default value of flashlight availibility to true.

We read from SettingsProvider to decide whether flashlight slice is
available. However, when switching to the second user, FLASHLIGHT_AVAILABLE
will be null. The default was 0 which causes the slice returning null,
so we have to set it to 1 when there is a physical flash unit to be
consistent with system ui.

Fixes: 134734608
Test: robotest
Change-Id: I981461b1b66e6e273e13a9cbcba96e3ccf0aec68

src/com/android/settings/flashlight/FlashlightSlice.java

@@ -39,6 +39,7 @@ import androidx.slice.builders.ListBuilder;
 import androidx.slice.builders.ListBuilder.RowBuilder;
 import androidx.slice.builders.SliceAction;
 
+import com.android.internal.annotations.VisibleForTesting;
 import com.android.settings.R;
 import com.android.settings.Utils;
 import com.android.settings.slices.CustomSliceRegistry;
@@ -131,10 +132,19 @@ public class FlashlightSlice implements CustomSliceable {
         return null;
     }
 
-
-    private static boolean isFlashlightAvailable(Context context) {
-        return Settings.Secure.getInt(
-                context.getContentResolver(), Secure.FLASHLIGHT_AVAILABLE, 0) == 1;
+    @VisibleForTesting
+    static boolean isFlashlightAvailable(Context context) {
+        int defaultAvailability = 0;
+        try {
+            // check if there is a flash unit
+            if (getCameraId(context) != null) {
+                defaultAvailability = 1;
+            }
+        } catch (CameraAccessException e) {
+            Log.e(TAG, "Error getting camera id.", e);
+        }
+        return Secure.getInt(context.getContentResolver(),
+                Secure.FLASHLIGHT_AVAILABLE, defaultAvailability) == 1;
     }
 
     private static boolean isFlashlightEnabled(Context context) {

tests/robotests/src/com/android/settings/flashlight/FlashlightSliceTest.java

@@ -20,6 +20,8 @@ package com.android.settings.flashlight;
 import static com.google.common.truth.Truth.assertThat;
 
 import android.content.Context;
+import android.hardware.camera2.CameraCharacteristics;
+import android.hardware.camera2.CameraManager;
 import android.provider.Settings;
 
 import androidx.slice.Slice;
@@ -35,6 +37,11 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.robolectric.RobolectricTestRunner;
 import org.robolectric.RuntimeEnvironment;
+import org.robolectric.Shadows;
+import org.robolectric.annotation.Config;
+import org.robolectric.shadow.api.Shadow;
+import org.robolectric.shadows.ShadowCameraCharacteristics;
+import org.robolectric.shadows.ShadowCameraManager;
 
 import java.util.List;
 
@@ -42,10 +49,12 @@ import java.util.List;
 public class FlashlightSliceTest {
 
     private Context mContext;
+    private ShadowCameraManager mShadowCameraManager;
 
     @Before
     public void setUp() {
         mContext = RuntimeEnvironment.application;
+        mShadowCameraManager = Shadows.shadowOf(mContext.getSystemService(CameraManager.class));
 
         // Set-up specs for SliceMetadata.
         SliceProvider.setSpecs(SliceLiveData.SUPPORTED_SPECS);
@@ -64,4 +73,22 @@ public class FlashlightSliceTest {
         final List<SliceAction> toggles = metadata.getToggles();
         assertThat(toggles).hasSize(1);
     }
+
+    @Test
+    public void isFlashlightAvailable_nullSecureAttr_noFlashUnit_returnFalse() {
+        assertThat(FlashlightSlice.isFlashlightAvailable(mContext)).isFalse();
+    }
+
+    @Test
+    public void isFlashlightAvailable_nullSecureAttr_hasFlashUnit_returnTrue() {
+        final CameraCharacteristics characteristics =
+                ShadowCameraCharacteristics.newCameraCharacteristics();
+        final ShadowCameraCharacteristics shadowCharacteristics = Shadow.extract(characteristics);
+        shadowCharacteristics.set(CameraCharacteristics.FLASH_INFO_AVAILABLE, true);
+        shadowCharacteristics
+                .set(CameraCharacteristics.LENS_FACING, CameraCharacteristics.LENS_FACING_BACK);
+        mShadowCameraManager.addCamera("camera_id", characteristics);
+
+        assertThat(FlashlightSlice.isFlashlightAvailable(mContext)).isTrue();
+    }
 }