v7/mediarouter/src/android/support/v7/app/MediaRouterThemeHelper.java

/*
 * Copyright (C) 2013 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 android.support.v7.app;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.support.v7.mediarouter.R;
import android.util.TypedValue;
import android.view.ContextThemeWrapper;

final class MediaRouterThemeHelper {
    private MediaRouterThemeHelper() {
    }

    public static Context createThemedContext(Context context) {
        boolean isLightTheme = isLightTheme(context);
        return new ContextThemeWrapper(context, isLightTheme ?
                R.style.Theme_MediaRouter_Light : R.style.Theme_MediaRouter);
    }

    public static int getThemeResource(Context context, int attr) {
        TypedValue value = new TypedValue();
        return context.getTheme().resolveAttribute(attr, value, true) ? value.resourceId : 0;
    }

    public static Drawable getThemeDrawable(Context context, int attr) {
        int res = getThemeResource(context, attr);
        return res != 0 ? context.getResources().getDrawable(res) : null;
    }

    private static boolean isLightTheme(Context context) {
        TypedValue value = new TypedValue();
        return context.getTheme().resolveAttribute(R.attr.isLightTheme, value, true)
                && value.data != 0;
    }
}