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1 /*
2  * Copyright (C) 2015 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 com.android.camera.app.AppController;
20 import com.android.camera.CameraActivity;
21 import com.android.camera.one.OneCamera;
22 import com.android.camera2.R;
23 
24 import android.content.res.Resources;
25 
26 /**
27  * Handles the camera facing setting for a particular scope stored in
28  * SharedPreferences keyed by Keys.KEY_CAMERA_ID.
29  */
30 public class CameraFacingSetting {
31     private final SettingsManager mSettingsManager;
32 
33     private final String mSettingScope;
34 
35     private final String mCameraFacingSettingKey;
36 
37     private final int mCameraFacingBackValue;
38     private final int mCameraFacingFrontValue;
39     private final int mCameraFacingDefaultValue;
40 
CameraFacingSetting( Resources resources, SettingsManager settingsManager, String moduleSettingScope, AppController appController)41     public CameraFacingSetting(
42             Resources resources,
43             SettingsManager settingsManager,
44             String moduleSettingScope,
45             AppController appController) {
46         mSettingsManager = settingsManager;
47 
48         mSettingScope = SettingsManager.getModuleSettingScope(moduleSettingScope);
49 
50         mCameraFacingSettingKey = Keys.KEY_CAMERA_ID;
51         mCameraFacingDefaultValue =
52                 Integer.parseInt(resources.getString(R.string.pref_camera_id_default));
53 
54         if (appController.getCameraProvider().getCharacteristics(mCameraFacingDefaultValue).
55                 isFacingFront()) {
56             mCameraFacingFrontValue = 0;
57             mCameraFacingBackValue = 1;
58         } else {
59             mCameraFacingBackValue = 0;
60             mCameraFacingFrontValue = 1;
61         }
62     }
63 
64     @Override
toString()65     public String toString() {
66         return isFacingBack() ? "Back Camera" : "Front Camera";
67     }
68 
69     /**
70      * Sets the default value for the camera facing setting.
71      */
setDefault()72     public void setDefault() {
73         mSettingsManager.setDefaults(
74                 Keys.KEY_CAMERA_ID,
75                 mCameraFacingDefaultValue,
76                 new int[]{mCameraFacingBackValue, mCameraFacingFrontValue});
77     }
78 
79     /**
80      * Whether the back camera should be opened.
81      *
82      * @return Whether the back camera should be opened.
83      */
isFacingBack()84     public boolean isFacingBack() {
85         return getCameraFacing() == OneCamera.Facing.BACK;
86     }
87 
88     /**
89      * Whether the front camera should be opened.
90      *
91      * @return Whether the front camera should be opened.
92      */
isFacingFront()93     public boolean isFacingFront() {
94         return getCameraFacing() == OneCamera.Facing.FRONT;
95     }
96 
97     /**
98      * Gets the current camera facing in the setting.
99      *
100      * @return The current camera facing in the setting.
101      */
getCameraFacing()102     public OneCamera.Facing getCameraFacing() {
103         final int cameraId = mSettingsManager.getInteger(mSettingScope, mCameraFacingSettingKey);
104         if (cameraId == mCameraFacingBackValue) {
105             return OneCamera.Facing.BACK;
106         } else if (cameraId == mCameraFacingFrontValue) {
107             return OneCamera.Facing.FRONT;
108         } else {
109             return getDefaultCameraFacing();
110         }
111     }
112 
113     /**
114      * Sets the camera facing setting.
115      *
116      * @param cameraFacing The new camera facing.
117      */
setCameraFacing(OneCamera.Facing cameraFacing)118     public void setCameraFacing(OneCamera.Facing cameraFacing) {
119         final int cameraId = (cameraFacing == OneCamera.Facing.BACK) ?
120                 mCameraFacingBackValue : mCameraFacingFrontValue;
121         mSettingsManager.set(mSettingScope, mCameraFacingSettingKey, cameraId);
122     }
123 
124     /**
125      * Changes the camera facing setting to the other side.
126      *
127      * @return The new camera facing.
128      */
switchCameraFacing()129     public OneCamera.Facing switchCameraFacing() {
130         final OneCamera.Facing originalFacing = getCameraFacing();
131         final OneCamera.Facing newFacing = (originalFacing == OneCamera.Facing.BACK) ?
132                 OneCamera.Facing.FRONT : OneCamera.Facing.BACK;
133         setCameraFacing(newFacing);
134         return newFacing;
135     }
136 
getDefaultCameraFacing()137     private OneCamera.Facing getDefaultCameraFacing() {
138         if (mCameraFacingDefaultValue == mCameraFacingBackValue) {
139             return OneCamera.Facing.BACK;
140         } else {
141             return OneCamera.Facing.FRONT;
142         }
143     }
144 }
145