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/*
* Copyright (C) 2014 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.camera.settings;
import android.content.Context;
import android.content.SharedPreferences;
import android.hardware.Camera;
import android.os.Build;
import android.preference.PreferenceManager;
import com.android.camera.util.Size;
import com.google.common.base.Optional;
import java.util.List;
/**
* Facilitates caching of camera supported picture sizes, which is slow
* to query. Will update cache if Build ID changes.
*/
public class CameraPictureSizesCacher {
private static final String PICTURE_SIZES_BUILD_KEY = "CachedSupportedPictureSizes_Build_Camera";
private static final String PICTURE_SIZES_SIZES_KEY = "CachedSupportedPictureSizes_Sizes_Camera";
/**
* Opportunistically update the picture sizes cache, if needed.
*
* @param cameraId cameraID we have sizes for.
* @param sizes List of valid sizes.
*/
public static void updateSizesForCamera(Context context, int cameraId, List<Size> sizes) {
String key_build = PICTURE_SIZES_BUILD_KEY + cameraId;
SharedPreferences defaultPrefs = PreferenceManager.getDefaultSharedPreferences(context);
String thisCameraCachedBuild = defaultPrefs.getString(key_build, null);
// Write to cache.
if (thisCameraCachedBuild == null) {
String key_sizes = PICTURE_SIZES_SIZES_KEY + cameraId;
SharedPreferences.Editor editor = defaultPrefs.edit();
editor.putString(key_build, Build.DISPLAY);
editor.putString(key_sizes, Size.listToString(sizes));
editor.apply();
}
}
/**
* Return list of Sizes for provided cameraId. Check first to see if we
* have it in the cache for the current android.os.Build.
* Note: This method calls Camera.open(), so the camera must be closed
* before calling or null will be returned if sizes were not previously
* cached.
*
* @param cameraId cameraID we would like sizes for.
* @param context valid android application context.
* @return List of valid sizes, or null if the Camera can not be opened.
*/
public static List<Size> getSizesForCamera(int cameraId, Context context) {
Optional<List<Size>> cachedSizes = getCachedSizesForCamera(cameraId, context);
if (cachedSizes.isPresent()) {
return cachedSizes.get();
}
// No cached value, so need to query Camera API.
Camera thisCamera;
try {
thisCamera = Camera.open(cameraId);
} catch (RuntimeException e) {
// Camera open will fail if already open.
return null;
}
if (thisCamera != null) {
String key_build = PICTURE_SIZES_BUILD_KEY + cameraId;
String key_sizes = PICTURE_SIZES_SIZES_KEY + cameraId;
SharedPreferences defaultPrefs = PreferenceManager.getDefaultSharedPreferences(context);
List<Size> sizes = Size.buildListFromCameraSizes(thisCamera.getParameters()
.getSupportedPictureSizes());
thisCamera.release();
SharedPreferences.Editor editor = defaultPrefs.edit();
editor.putString(key_build, Build.DISPLAY);
editor.putString(key_sizes, Size.listToString(sizes));
editor.apply();
return sizes;
}
return null;
}
/**
* Returns the cached sizes for the current camera. See
* {@link #getSizesForCamera} for details.
*
* @param cameraId cameraID we would like sizes for.
* @param context valid android application context.
* @return Optional ist of valid sizes. Not present if the sizes for the
* given camera were not cached.
*/
public static Optional<List<Size>> getCachedSizesForCamera(int cameraId, Context context) {
String key_build = PICTURE_SIZES_BUILD_KEY + cameraId;
String key_sizes = PICTURE_SIZES_SIZES_KEY + cameraId;
SharedPreferences defaultPrefs = PreferenceManager.getDefaultSharedPreferences(context);
// Return cached value for cameraId and current build, if available.
String thisCameraCachedBuild = defaultPrefs.getString(key_build, null);
if (thisCameraCachedBuild != null && thisCameraCachedBuild.equals(Build.DISPLAY)) {
String thisCameraCachedSizeList = defaultPrefs.getString(key_sizes, null);
if (thisCameraCachedSizeList != null) {
return Optional.of(Size.stringToList(thisCameraCachedSizeList));
}
}
return Optional.absent();
}
}
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