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