android/support/v4/content/res/ConfigurationHelper.java

/*
 * Copyright (C) 2016 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.v4.content.res;

import static android.os.Build.VERSION.SDK_INT;

import android.content.res.Configuration;
import android.content.res.Resources;
import android.support.annotation.NonNull;

/**
 * Helper class which allows access to properties of {@link Configuration} in
 * a backward compatible fashion.
 */
public final class ConfigurationHelper {
    private ConfigurationHelper() {
    }

    /**
     * Returns the target screen density being rendered to.
     *
     * <p>Uses {@code Configuration.densityDpi} when available, otherwise an approximation
     * is computed and returned.</p>
     */
    public static int getDensityDpi(@NonNull Resources resources) {
        if (SDK_INT >= 17) {
            return resources.getConfiguration().densityDpi;
        } else {
            return resources.getDisplayMetrics().densityDpi;
        }
    }
}