Don't show autofill settings if not enabled

The non-indexable keys of language-and-input on my angler are:
  game_controller_settings_category, gesture_assist,
  gesture_double_tap_screen, default_autofill

Fixes: 35956220
Test: Disabled auto-fill and looked at settings: did not find
      autofill button and could not find auto-fill in search
      Settings robolectric test
Merged-In: I0923e707422d1b1de5153a63fa3a5fe4773c055d
Change-Id: I0923e707422d1b1de5153a63fa3a5fe4773c055d

src/com/android/settings/applications/AutofillManagerWrapper.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2017 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.applications;
+
+import android.view.autofill.AutofillManager;
+
+/**
+ * This interface replicates a subset of the android.view.autofill.AutofillManager (AFM). The
+ * interface exists so that we can use a thin wrapper around the AFM in production code and a mock
+ * in tests. We cannot directly mock or shadow the AFM, because some of the methods we rely on are
+ * newer than the API version supported by Robolectric.
+ */
+public interface AutofillManagerWrapper {
+    /**
+     * Calls {@code AutofillManager.hasAutofillFeature()}.
+     *
+     * @see AutofillManager#hasAutofillFeature
+     */
+    public boolean hasAutofillFeature();
+
+    /**
+     * Calls {@code AutofillManager.isAutofillSupported()}.
+     *
+     * @see AutofillManager#isAutofillSupported
+     */
+    public boolean isAutofillSupported();
+}

src/com/android/settings/applications/AutofillManagerWrapperImpl.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2017 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.applications;
+
+import android.view.autofill.AutofillManager;
+
+public class AutofillManagerWrapperImpl implements AutofillManagerWrapper {
+    private final AutofillManager mAfm;
+
+    public AutofillManagerWrapperImpl(AutofillManager afm) {
+        mAfm = afm;
+    }
+
+    @Override
+    public boolean hasAutofillFeature() {
+        if (mAfm == null) {
+            return false;
+        }
+
+        return mAfm.hasAutofillFeature();
+    }
+
+    @Override
+    public boolean isAutofillSupported() {
+        if (mAfm == null) {
+            return false;
+        }
+
+        return mAfm.isAutofillSupported();
+    }
+}

src/com/android/settings/applications/defaultapps/DefaultAutofillPreferenceController.java

@@ -21,16 +21,25 @@ import android.content.Context;
 import android.content.Intent;
 import android.provider.Settings;
 import android.text.TextUtils;
+import android.view.autofill.AutofillManager;
+
+import com.android.settings.applications.AutofillManagerWrapper;
+import com.android.settings.applications.AutofillManagerWrapperImpl;
 
 public class DefaultAutofillPreferenceController extends DefaultAppPreferenceController {
+    private AutofillManagerWrapper mAutofillManager;
 
     public DefaultAutofillPreferenceController(Context context) {
         super(context);
+
+        mAutofillManager = new AutofillManagerWrapperImpl(
+                mContext.getSystemService(AutofillManager.class));
     }
 
     @Override
     public boolean isAvailable() {
-        return true;
+        return mAutofillManager.hasAutofillFeature()
+                && mAutofillManager.isAutofillSupported();
     }
 
     @Override

src/com/android/settings/language/LanguageAndInputSettings.java

@@ -23,6 +23,8 @@ import android.os.UserHandle;
 import android.provider.SearchIndexableResource;
 import android.provider.Settings;
 import android.speech.tts.TtsEngines;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.support.annotation.VisibleForTesting;
 import android.text.TextUtils;
 import android.view.inputmethod.InputMethodInfo;
@@ -81,7 +83,16 @@ public class LanguageAndInputSettings extends DashboardFragment {
 
     @Override
     protected List<PreferenceController> getPreferenceControllers(Context context) {
-        final Lifecycle lifecycle = getLifecycle();
+        if (mAmbientDisplayConfig == null) {
+            mAmbientDisplayConfig = new AmbientDisplayConfiguration(context);
+        }
+
+        return buildPreferenceControllers(context, getLifecycle(), mAmbientDisplayConfig);
+    }
+
+    private static List<PreferenceController> buildPreferenceControllers(@NonNull Context context,
+            @Nullable Lifecycle lifecycle,
+            @NonNull AmbientDisplayConfiguration ambientDisplayConfiguration) {
         final List<PreferenceController> controllers = new ArrayList<>();
         // Language
         controllers.add(new PhoneLanguagePreferenceController(context));
@@ -93,11 +104,10 @@ public class LanguageAndInputSettings extends DashboardFragment {
         controllers.add(new PhysicalKeyboardPreferenceController(context, lifecycle));
         final GameControllerPreferenceController gameControllerPreferenceController
                 = new GameControllerPreferenceController(context);
-        lifecycle.addObserver(gameControllerPreferenceController);
-
-        if (mAmbientDisplayConfig == null) {
-            mAmbientDisplayConfig = new AmbientDisplayConfiguration(context);
+        if (lifecycle != null) {
+            lifecycle.addObserver(gameControllerPreferenceController);
         }
+
         controllers.add(gameControllerPreferenceController);
         // Gestures
         controllers.add(new AssistGesturePreferenceController(context, lifecycle));
@@ -105,9 +115,9 @@ public class LanguageAndInputSettings extends DashboardFragment {
         controllers.add(new DoubleTwistPreferenceController(context, lifecycle));
         controllers.add(new DoubleTapPowerPreferenceController(context, lifecycle));
         controllers.add(new PickupGesturePreferenceController(
-                context, lifecycle, mAmbientDisplayConfig, UserHandle.myUserId()));
+                context, lifecycle, ambientDisplayConfiguration, UserHandle.myUserId()));
         controllers.add(new DoubleTapScreenPreferenceController(
-                context, lifecycle, mAmbientDisplayConfig, UserHandle.myUserId()));
+                context, lifecycle, ambientDisplayConfiguration, UserHandle.myUserId()));
         controllers.add(new DefaultAutofillPreferenceController(context));
         return controllers;
     }
@@ -163,5 +173,11 @@ public class LanguageAndInputSettings extends DashboardFragment {
                     sir.xmlResId = R.xml.language_and_input;
                     return Arrays.asList(sir);
                 }
+
+                @Override
+                public List<PreferenceController> getPreferenceControllers(Context context) {
+                    return buildPreferenceControllers(context, null,
+                            new AmbientDisplayConfiguration(context));
+                }
             };
 }