| /* |
| * 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 android.content.res.Resources; |
| import android.os.Build; |
| import android.support.annotation.NonNull; |
| |
| /** |
| * Helper class which allows access to properties of {@link android.content.res.Configuration} in |
| * a backward compatible fashion. |
| */ |
| public final class ConfigurationHelper { |
| |
| private static final ConfigurationHelperImpl IMPL; |
| |
| static { |
| final int sdk = Build.VERSION.SDK_INT; |
| if (sdk >= 17) { |
| IMPL = new JellybeanMr1Impl(); |
| } else if (sdk >= 13) { |
| IMPL = new HoneycombMr2Impl(); |
| } else { |
| IMPL = new GingerbreadImpl(); |
| } |
| } |
| |
| private ConfigurationHelper() {} |
| |
| private interface ConfigurationHelperImpl { |
| int getScreenHeightDp(@NonNull Resources resources); |
| int getScreenWidthDp(@NonNull Resources resources); |
| int getSmallestScreenWidthDp(@NonNull Resources resources); |
| int getDensityDpi(@NonNull Resources resources); |
| } |
| |
| private static class GingerbreadImpl implements ConfigurationHelperImpl { |
| GingerbreadImpl() { |
| } |
| |
| @Override |
| public int getScreenHeightDp(@NonNull Resources resources) { |
| return ConfigurationHelperGingerbread.getScreenHeightDp(resources); |
| } |
| |
| @Override |
| public int getScreenWidthDp(@NonNull Resources resources) { |
| return ConfigurationHelperGingerbread.getScreenWidthDp(resources); |
| } |
| |
| @Override |
| public int getSmallestScreenWidthDp(@NonNull Resources resources) { |
| return ConfigurationHelperGingerbread.getSmallestScreenWidthDp(resources); |
| } |
| |
| @Override |
| public int getDensityDpi(@NonNull Resources resources) { |
| return ConfigurationHelperGingerbread.getDensityDpi(resources); |
| } |
| } |
| |
| private static class HoneycombMr2Impl extends GingerbreadImpl { |
| HoneycombMr2Impl() { |
| } |
| |
| @Override |
| public int getScreenHeightDp(@NonNull Resources resources) { |
| return ConfigurationHelperHoneycombMr2.getScreenHeightDp(resources); |
| } |
| |
| @Override |
| public int getScreenWidthDp(@NonNull Resources resources) { |
| return ConfigurationHelperHoneycombMr2.getScreenWidthDp(resources); |
| } |
| |
| @Override |
| public int getSmallestScreenWidthDp(@NonNull Resources resources) { |
| return ConfigurationHelperHoneycombMr2.getSmallestScreenWidthDp(resources); |
| } |
| } |
| |
| private static class JellybeanMr1Impl extends HoneycombMr2Impl { |
| JellybeanMr1Impl() { |
| } |
| |
| @Override |
| public int getDensityDpi(@NonNull Resources resources) { |
| return ConfigurationHelperJellybeanMr1.getDensityDpi(resources); |
| } |
| } |
| |
| /** |
| * Returns the current height of the available screen space, in dp units. |
| * |
| * <p>Uses {@code Configuration.screenHeightDp} when available, otherwise an approximation |
| * is computed and returned.</p> |
| */ |
| public static int getScreenHeightDp(@NonNull Resources resources) { |
| return IMPL.getScreenHeightDp(resources); |
| } |
| |
| /** |
| * Returns the current width of the available screen space, in dp units. |
| * |
| * <p>Uses {@code Configuration.screenWidthDp} when available, otherwise an approximation |
| * is computed and returned.</p> |
| */ |
| public static int getScreenWidthDp(@NonNull Resources resources) { |
| return IMPL.getScreenWidthDp(resources); |
| } |
| |
| /** |
| * Returns The smallest screen size an application will see in normal operation, in dp units. |
| * |
| * <p>Uses {@code Configuration.smallestScreenWidthDp} when available, otherwise an |
| * approximation is computed and returned.</p> |
| */ |
| public static int getSmallestScreenWidthDp(@NonNull Resources resources) { |
| return IMPL.getSmallestScreenWidthDp(resources); |
| } |
| |
| /** |
| * 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) { |
| return IMPL.getDensityDpi(resources); |
| } |
| } |