src/com/android/settings/development/featureflags/FeatureFlagsPreferenceController.java

/*
 * 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.development.featureflags;

import android.content.Context;
import android.support.v7.preference.PreferenceScreen;
import android.util.FeatureFlagUtils;

import com.android.settings.core.PreferenceControllerMixin;
import com.android.settingslib.core.AbstractPreferenceController;
import com.android.settingslib.core.lifecycle.Lifecycle;
import com.android.settingslib.core.lifecycle.LifecycleObserver;
import com.android.settingslib.core.lifecycle.events.OnStart;

import java.util.Map;

public class FeatureFlagsPreferenceController extends AbstractPreferenceController
        implements PreferenceControllerMixin, LifecycleObserver, OnStart {

    private PreferenceScreen mScreen;

    public FeatureFlagsPreferenceController(Context context, Lifecycle lifecycle) {
        super(context);
        if (lifecycle != null) {
            lifecycle.addObserver(this);
        }
    }

    @Override
    public boolean isAvailable() {
        return true;
    }

    @Override
    public String getPreferenceKey() {
        return null;
    }

    @Override
    public void displayPreference(PreferenceScreen screen) {
        super.displayPreference(screen);
        mScreen = screen;
    }

    @Override
    public void onStart() {
        if (mScreen == null) {
            return;
        }
        final Map<String, String> featureMap = FeatureFlagUtils.getAllFeatureFlags();
        if (featureMap == null) {
            return;
        }
        mScreen.removeAll();
        final Context prefContext = mScreen.getContext();
        for (String feature : featureMap.keySet()) {
            mScreen.addPreference(new FeatureFlagPreference(prefContext, feature));
        }
    }
}