1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.camera.settings; 18 19 import android.content.Context; 20 import android.content.SharedPreferences; 21 import android.hardware.Camera; 22 import android.os.Build; 23 import android.preference.PreferenceManager; 24 25 import com.android.ex.camera2.portability.Size; 26 27 import java.util.List; 28 29 /** 30 * Facilitates caching of camera supported picture sizes, which is slow 31 * to query. Will update cache if Build ID changes. 32 */ 33 public class CameraPictureSizesCacher { 34 public static final String PICTURE_SIZES_BUILD_KEY = "CachedSupportedPictureSizes_Build_Camera"; 35 public static final String PICTURE_SIZES_SIZES_KEY = "CachedSupportedPictureSizes_Sizes_Camera"; 36 37 /** 38 * Opportunistically update the picture sizes cache, if needed. 39 * 40 * @param cameraId cameraID we have sizes for. 41 * @param sizes List of valid sizes. 42 */ 43 public static void updateSizesForCamera(Context context, int cameraId, List<Size> sizes) { 44 String key_build = PICTURE_SIZES_BUILD_KEY + cameraId; 45 SharedPreferences defaultPrefs = PreferenceManager.getDefaultSharedPreferences(context); 46 String thisCameraCachedBuild = defaultPrefs.getString(key_build, null); 47 // Write to cache. 48 if (thisCameraCachedBuild == null) { 49 String key_sizes = PICTURE_SIZES_SIZES_KEY + cameraId; 50 SharedPreferences.Editor editor = defaultPrefs.edit(); 51 editor.putString(key_build, Build.DISPLAY); 52 editor.putString(key_sizes, Size.listToString(sizes)); 53 editor.apply(); 54 } 55 } 56 57 /** 58 * Return list of Sizes for provided cameraId. Check first to see if we 59 * have it in the cache for the current android.os.Build. 60 * Note: This method calls Camera.open(), so the camera must be closed 61 * before calling or null will be returned if sizes were not previously 62 * cached. 63 * 64 * @param cameraId cameraID we would like sizes for. 65 * @return List of valid sizes, or null if the Camera can not be opened. 66 */ 67 public static List<Size> getSizesForCamera(int cameraId, Context context) { 68 String key_build = PICTURE_SIZES_BUILD_KEY + cameraId; 69 String key_sizes = PICTURE_SIZES_SIZES_KEY + cameraId; 70 SharedPreferences defaultPrefs = PreferenceManager.getDefaultSharedPreferences(context); 71 // Return cached value for cameraId and current build, if available. 72 String thisCameraCachedBuild = defaultPrefs.getString(key_build, null); 73 if (thisCameraCachedBuild != null && thisCameraCachedBuild.equals(Build.DISPLAY)) { 74 String thisCameraCachedSizeList = defaultPrefs.getString(key_sizes, null); 75 if (thisCameraCachedSizeList != null) { 76 return Size.stringToList(thisCameraCachedSizeList); 77 } 78 } 79 // No cached value, so need to query Camera API. 80 Camera thisCamera; 81 try { 82 thisCamera = Camera.open(cameraId); 83 } catch (RuntimeException e) { 84 // Camera open will fail if already open. 85 return null; 86 } 87 if (thisCamera != null) { 88 List<Size> sizes = Size.buildListFromCameraSizes(thisCamera.getParameters() 89 .getSupportedPictureSizes()); 90 thisCamera.release(); 91 SharedPreferences.Editor editor = defaultPrefs.edit(); 92 editor.putString(key_build, Build.DISPLAY); 93 editor.putString(key_sizes, Size.listToString(sizes)); 94 editor.apply(); 95 return sizes; 96 } 97 return null; 98 } 99 } 100
