src/com/android/settings/dream/StartNowPreferenceController.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.dream;

import android.content.Context;
import android.support.v7.preference.Preference;
import android.support.v7.preference.PreferenceScreen;
import android.widget.Button;
import com.android.settings.R;
import com.android.settings.applications.LayoutPreference;
import com.android.settings.core.PreferenceControllerMixin;
import com.android.settingslib.core.AbstractPreferenceController;
import com.android.settingslib.dream.DreamBackend;

public class StartNowPreferenceController extends AbstractPreferenceController implements
        PreferenceControllerMixin {
    private static final String TAG = "StartNowPreferenceController";
    private static final String PREF_KEY = "dream_start_now_button_container";
    private final DreamBackend mBackend;

    public StartNowPreferenceController(Context context) {
        super(context);

        mBackend = DreamBackend.getInstance(context);
    }

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

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

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

        LayoutPreference pref = (LayoutPreference) screen.findPreference(getPreferenceKey());
        Button startButton = (Button)pref.findViewById(R.id.dream_start_now_button);
        startButton.setOnClickListener(v -> mBackend.startDreaming());
    }

    @Override
    public void updateState(Preference preference) {
        super.updateState(preference);

        Button startButton = (Button)((LayoutPreference)preference)
                .findViewById(R.id.dream_start_now_button);
        startButton.setEnabled(mBackend.getWhenToDreamSetting() != DreamBackend.NEVER);
    }
}