Added autofill options on Developer Options screen.

Test: manual verification
Test: atest AutofillResetOptionsPreferenceControllerTest\
            AutofillLoggingLevelPreferenceControllerTest
Test: runtest --path packages/apps/Settings/tests/unit/src/com/android/settings/core/PreferenceControllerContractTest.java
Fixes: 65700540

Change-Id: I6b35fbf549529f4d97df164ce3fb6d641ee37650

src/com/android/settings/development/autofill/AutofillLoggingLevelPreferenceController.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2018 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.development.autofill;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.provider.Settings;
+import android.view.autofill.AutofillManager;
+
+import com.android.settings.R;
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.development.DeveloperOptionsPreferenceController;
+
+import androidx.preference.ListPreference;
+import androidx.preference.Preference;
+
+public final class AutofillLoggingLevelPreferenceController
+        extends DeveloperOptionsPreferenceController
+        implements PreferenceControllerMixin, Preference.OnPreferenceChangeListener {
+
+    private static final String AUTOFILL_LOGGING_LEVEL_KEY = "autofill_logging_level";
+
+    private final String[] mListValues;
+    private final String[] mListSummaries;
+    private final AutofillDeveloperSettingsObserver mObserver;
+
+    public AutofillLoggingLevelPreferenceController(Context context) {
+        super(context);
+
+        Resources resources = context.getResources();
+        mListValues = resources.getStringArray(R.array.autofill_logging_level_values);
+        mListSummaries = resources.getStringArray(R.array.autofill_logging_level_entries);
+        mObserver = new AutofillDeveloperSettingsObserver(mContext, () -> updateOptions());
+        mObserver.register();
+        // TODO: there should be a hook on AbstractPreferenceController where we could unregister it
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return AUTOFILL_LOGGING_LEVEL_KEY;
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        writeLevel(newValue);
+        updateOptions();
+        return true;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        updateOptions();
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchDisabled() {
+        super.onDeveloperOptionsSwitchDisabled();
+        writeLevel(null);
+    }
+
+    private void updateOptions() {
+        final int level = Settings.Global.getInt(mContext.getContentResolver(),
+                Settings.Global.AUTOFILL_LOGGING_LEVEL, AutofillManager.DEFAULT_LOGGING_LEVEL);
+
+        final int index;
+        if (level == AutofillManager.FLAG_ADD_CLIENT_DEBUG) {
+            index = 1;
+        } else if (level == AutofillManager.FLAG_ADD_CLIENT_VERBOSE) {
+            index = 2;
+        } else {
+            index = 0;
+        }
+        final ListPreference listPreference = (ListPreference) mPreference;
+        listPreference.setValue(mListValues[index]);
+        listPreference.setSummary(mListSummaries[index]);
+    }
+
+    private void writeLevel(Object newValue) {
+        int level = AutofillManager.NO_LOGGING;
+        if (newValue instanceof String) {
+            level = Integer.parseInt((String) newValue);
+        }
+        Settings.Global.putInt(mContext.getContentResolver(),
+                Settings.Global.AUTOFILL_LOGGING_LEVEL, level);
+    }
+}