src/com/android/settings/wfd/WifiDisplayPreferenceController.java

/*
 * Copyright (C) 2019 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.wfd;

import android.content.Context;
import android.media.MediaRouter;
import android.media.MediaRouter.RouteInfo;

import androidx.preference.Preference;
import androidx.preference.PreferenceScreen;

import com.android.settings.R;
import com.android.settings.core.BasePreferenceController;
import com.android.settingslib.core.lifecycle.LifecycleObserver;
import com.android.settingslib.core.lifecycle.events.OnStart;
import com.android.settingslib.core.lifecycle.events.OnStop;

public class WifiDisplayPreferenceController extends BasePreferenceController implements
        LifecycleObserver, OnStart, OnStop {

    private final MediaRouter mRouter;
    private Preference mPreference;
    private final MediaRouter.Callback mRouterCallback = new MediaRouter.SimpleCallback() {
        @Override
        public void onRouteSelected(MediaRouter router, int type, RouteInfo info) {
            refreshSummary(mPreference);
        }

        @Override
        public void onRouteUnselected(MediaRouter router, int type, RouteInfo info) {
            refreshSummary(mPreference);
        }

        @Override
        public void onRouteAdded(MediaRouter router, RouteInfo info) {
            refreshSummary(mPreference);
        }

        @Override
        public void onRouteRemoved(MediaRouter router, RouteInfo info) {
            refreshSummary(mPreference);
        }

        @Override
        public void onRouteChanged(MediaRouter router, RouteInfo info) {
            refreshSummary(mPreference);
        }
    };

    public WifiDisplayPreferenceController(Context context, String key) {
        super(context, key);
        mRouter = context.getSystemService(MediaRouter.class);
        mRouter.setRouterGroupId(MediaRouter.MIRRORING_GROUP_ID);
    }

    @Override
    public int getAvailabilityStatus() {
        return WifiDisplaySettings.isAvailable(mContext) ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
    }

    @Override
    public void displayPreference(PreferenceScreen screen) {
        super.displayPreference(screen);
        mPreference = screen.findPreference(getPreferenceKey());
    }

    @Override
    public CharSequence getSummary() {
        CharSequence summary = mContext.getString(R.string.disconnected);

        final int routeCount = mRouter.getRouteCount();
        for (int i = 0; i < routeCount; i++) {
            final MediaRouter.RouteInfo route = mRouter.getRouteAt(i);
            if (route.matchesTypes(MediaRouter.ROUTE_TYPE_REMOTE_DISPLAY)
                    && route.isSelected() && !route.isConnecting()) {
                summary = mContext.getString(R.string.wifi_display_status_connected);
                break;
            }
        }
        return summary;
    }

    @Override
    public void onStart() {
        mRouter.addCallback(MediaRouter.ROUTE_TYPE_REMOTE_DISPLAY, mRouterCallback);
    }

    @Override
    public void onStop() {
        mRouter.removeCallback(mRouterCallback);
    }
}