Android 13.0 MTK Camera2 設置默認拍照尺寸功能實現

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需求：

默認相機拍照尺寸

需求原因
1）客戶自身喜好
2）部分客戶自己的攝像頭不兼容，比如拍照尺寸太大會卡頓，拉絲等現象

參考資料

Android 13.0 MTK Camera2 設置默認拍照尺寸功能實現
Android 11.0 MTK Camera2 設置默認拍照尺寸功能實現

這兩篇文章介紹的蠻好的，可以看看，對于類似需求同理也可以按照改一改？ 為什么有些會默認最高分辨率拍照，可能原因在于手機端產品為了最好的拍攝效果，尺寸會默認到最大。

對于Camera2 開發，遇到的困難點就是源碼代碼量太多，對于很多同事來說就是一臉懵逼，建議多積累一定的代碼量，掌握基本的知識。

架構圖了解

MTKCamera2相機架構
Camera2架構
Android Camera架構簡析

Camera相關專欄

Camera Framework 專欄
小馳私房菜系列
小馳私房菜MTK系列
小馳Camera 開發系列
Camera 相機開發
展訊平臺 Camera
官方文檔：谷歌官方 API 描述

零散知識了解

MTK 相機UI介紹
Camera2 相機認知
Camera2學習筆記
camera2關于拍照預覽方向旋轉90度和拍照圖片鏡像功能實現
Camera2 預覽集成、簡單拍照：熟悉預覽步驟流程比較有用
Camera鏡像上下左右顛倒問題的解決辦法
MTK相機成像質量差
Camera應用分析

部分相機源碼參考，學習API使用，梳理流程，偏應用層

極客相機 Camera2 API
Camera2 API詳解
極客相機源碼
Camera2 相機Demo
Camera2 專業相機Demo
拍照、預覽、錄像Demo
使用Camera2 拍照

Camera2 系統相關

Camera2 Service 啟動

修改文件-修改方案

修改文件：

\vendor\mediatek\proprietary\packages\apps\Camera2\feature\setting\picturesize\src\com\mediatek\camera\feature\setting\picturesize\PictureSize.java\vendor\mediatek\proprietary\packages\apps\Camera2\feature\setting\picturesize\src\com\mediatek\camera\feature\setting\picturesize\PictureSizeHelper.java

修改內容：

PictureSize.java onValueInitialized 方法

在 onValueInitialized 方法中，默認valueInStore 中調用PictureSizeHelper 類中自定義的 getCustomDefault 方法

         if (valueInStore == null) {// Default picture size is the max full-ratio size.
-            List<String> entryValues = getEntryValues();
+                       LogHelper.d(TAG, "valueInStore == null  Default picture size is the max full-ratio size:");
+            /*List<String> entryValues = getEntryValues();for (String value : entryValues) {if (PictureSizeHelper.getStandardAspectRatio(value) == fullRatio) {valueInStore = value;
+                                       LogHelper.d(TAG, "valueInStore == null:valueInStore:"+valueInStore);break;}
-            }
+            }*/
+                        valueInStore =PictureSizeHelper.getCustomDefault(getEntryValues());
+                       }

PictureSizeHelper.java getCustomDefault 方法

自定義 getCustomDefault 方法，設置默認分辨率。 這里直接寫死，或者 根據客需要求設置為最大、最小 等。

    public static String getCustomDefault(List<String> supportedEntryValues){for (int i=0;i< supportedEntryValues.size();i++) {   /*Size size = valueToSize(supportedEntryValues.get(i));temp = size.width * size.height;        if (temp > maxSize) {maxSize = temp;maxIndex = i;}*/LogHelper.d(TAG,   "getCustomDefault:" +supportedEntryValues.get(i));}return  "1920x1088";}

源碼分析

設置拍照尺寸的核心類

\vendor\mediatek\proprietary\packages\apps\Camera2\feature\setting\picturesize\src\com\mediatek\camera\feature\setting\picturesize\PictureSize.java
\vendor\mediatek\proprietary\packages\apps\Camera2\feature\setting\picturesize\src\com\mediatek\camera\feature\setting\picturesize\PictureSizeHelper.java
\vendor\mediatek\proprietary\packages\apps\Camera2\feature\setting\picturesize\src\com\mediatek\camera\feature\setting\picturesize\PictureSizeSettingView.java

源碼逐步分析

關聯的照片大小搜索

grep -rn 照片大小

找到如下路徑相關關鍵字：照片大小

feature/mode/vsdof/res/values-zh-rCN/strings.xml
<string name="sdof_picture_size_title">"照片大小"</string>feature/setting/picturesize/res/values-zh-rCN/strings.xml<string name="pref_camera_picturesize_title">"照片大小"</string>

PictureSizeSelector

上面已經找到了兩個關鍵字，這里先根據第一個關鍵字找一下源碼：
路徑：

/vendor/mediatek/proprietary/packages/apps/Camera2/feature/setting/picturesize/src/com/mediatek/camera/feature/setting/picturesize/PictureSizeSelector.java

R.string.pref_camera_picturesize_title

我們看類定義：

/*** Picture size selector.*/public class PictureSizeSelector extends PreferenceFragment {

就是圖片大小選擇器
對應的是如下界面：

既然是這個界面，那就看一下點擊選中方法和進入這個界面的設置方法

進入界面選中的邏輯

這里關聯的有四個方法，對應的進入界面選中邏輯：

@Overridepublic void onCreate(Bundle savedInstanceState) {LogHelper.d(TAG, "[onCreate]");super.onCreate(savedInstanceState);prepareValuesOnShown();Toolbar toolbar = (Toolbar) getActivity().findViewById(R.id.toolbar);if (toolbar != null) {toolbar.setTitle(getActivity().getResources().getString(R.string.pref_camera_picturesize_title));}addPreferencesFromResource(R.xml.picturesize_selector_preference);PreferenceScreen screen = getPreferenceScreen();for (int i = 0 ; i < mEntryValues.size(); i++) {RadioPreference preference = new RadioPreference(getActivity());if (mEntryValues.get(i).equals(mSelectedValue)) {preference.setChecked(true);}LogHelper.d(TAG," onCreate  ->mEntryValues.get(i):"+mEntryValues.get(i));preference.setTitle(mTitleList.get(i));preference.setSummary(mSummaryList.get(i));preference.setOnPreferenceClickListener(mOnPreferenceClickListener);screen.addPreference(preference);}}/*** Set the default selected value.** @param value The default selected value.*/public void setValue(String value) {LogHelper.d(TAG,"  setValue: value->"+value);mSelectedValue = value;}/*** Set the picture sizes supported.** @param entryValues The picture sizes supported.*/public void setEntryValues(List<String> entryValues) {mEntryValues.clear();mEntryValues.addAll(entryValues);}private void prepareValuesOnShown() {List<String> tempValues = new ArrayList<>(mEntryValues);mEntryValues.clear();mTitleList.clear();mSummaryList.clear();for (int i = 0; i < tempValues.size(); i++) {String value = tempValues.get(i);String title = PictureSizeHelper.getPixelsAndRatio(value);LogHelper.d(TAG,"  prepareValuesOnShown: value->"+value+"     title:"+title);if (title != null) {mTitleList.add(title);mEntryValues.add(value);mSummaryList.add(value);}else{LogHelper.d(TAG, "[prepareValuesOnShown] value :"+value+" will not shown.");}}}

方法	作用
setEntryValues	設置支持的圖片大小 分辨率
prepareValuesOnShown	準備顯示的數據 在onCreate 方法里面調用的
setValue	設置默認選擇的值
onCreate	通過setEntryValue 設置的集合，遍歷創建PreferenceScreen ，對于傳遞進來的value 作為選中效果

點擊選中圖片大小邏輯

對于點擊邏輯更為簡單，回調 返回上一層，代碼如下：

   private class MyOnPreferenceClickListener implements Preference.OnPreferenceClickListener {@Overridepublic boolean onPreferenceClick(Preference preference) {String summary = (String) preference.getSummary();int index = mSummaryList.indexOf(summary);String value = mEntryValues.get(index);mListener.onItemClick(value);LogHelper.d(TAG,"  MyOnPreferenceClickListener: onPreferenceClick  value->"+value);mSelectedValue = value;getActivity().getFragmentManager().popBackStack();return true;}}

PictureSizeSelectorPreference

同 PictureSizeSelector 上面已經找到了兩個關鍵字，這里先根據第二個關鍵字找一下源碼：
路徑：

./vendor/mediatek/proprietary/packages/apps/Camera2/feature/mode/aicombo/src/com/mediatek/camera/feature/mode/aicombo/photo/view/PictureSizeSelectorPreference.java
./vendor/mediatek/proprietary/packages/apps/Camera2/feature/mode/vsdof/src/com/mediatek/camera/feature/mode/vsdof/photo/view/PictureSizeSelectorPreference.java看源碼發現和 PictureSizeSelector 代碼基本一致 ，但是仔細看一個方法的說明如下：/*** Set the video quality supported.* @param entryValues The video quality supported.*/public void setEntryValues(List<String> entryValues) {mEntryValues.clear();mEntryValues.addAll(entryValues);}這些事設置Vieo 的  并不是設置picture 的。 所以我們需求設置圖片質量的其實應該是上面找到的 PictureSizeSelector 

PictureSizeSettingView

路徑：

/vendor/mediatek/proprietary/packages/apps/Camera2/feature/setting/picturesize/src/com/mediatek/camera/feature/setting/picturesize/PictureSizeSettingView.java

找到這個類的方法有兩種

• grep 查找關鍵字 “照片大小”
• 根據上面定位到的源碼 PictureSizeSelector

就是進入到 PictureSizeSelector 界面之前的頁面，如下：

準確的來說， PictureSizeSettingView 對應的其實是這個界面中 圖片大小的這個item .
源碼代碼量不多，我們賦上來看看：

package com.mediatek.camera.feature.setting.picturesize;import android.app.Activity;
import android.app.FragmentTransaction;
import android.preference.PreferenceFragment;import com.mediatek.camera.R;
import com.mediatek.camera.common.debug.LogHelper;
import com.mediatek.camera.common.debug.LogUtil;
import com.mediatek.camera.common.preference.Preference;
import com.mediatek.camera.common.setting.ICameraSettingView;import java.util.ArrayList;
import java.util.List;/*** Picture size setting view.*/
public class PictureSizeSettingView implements ICameraSettingView,PictureSizeSelector.OnItemClickListener {private static final LogUtil.Tag TAG =new LogUtil.Tag(PictureSizeSettingView.class.getSimpleName());private Activity mActivity;private Preference mPref;private OnValueChangeListener mListener;private String mKey;private String mSelectedValue;private List<String> mEntryValues = new ArrayList<>();private String mSummary;private PictureSizeSelector mSizeSelector;private boolean mEnabled;/*** Listener to listen picture size value changed.*/public interface OnValueChangeListener {/*** Callback when picture size value changed.** @param value The changed picture size, such as "1920x1080".*/void onValueChanged(String value);}/*** Picture size setting view constructor.** @param key The key of picture size.*/public PictureSizeSettingView(String key) {mKey = key;}@Overridepublic void loadView(PreferenceFragment fragment) {LogHelper.d(TAG, "[loadView]");mActivity = fragment.getActivity();if (mSizeSelector == null) {mSizeSelector = new PictureSizeSelector();mSizeSelector.setOnItemClickListener(this);}fragment.addPreferencesFromResource(R.xml.picturesize_preference);mPref = (Preference) fragment.findPreference(mKey);mPref.setRootPreference(fragment.getPreferenceScreen());mPref.setId(R.id.picture_size_setting);mPref.setContentDescription(mActivity.getResources().getString(R.string.picture_size_content_description));mPref.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {@Overridepublic boolean onPreferenceClick(android.preference.Preference preference) {mSizeSelector.setValue(mSelectedValue);mSizeSelector.setEntryValues(mEntryValues);FragmentTransaction transaction = mActivity.getFragmentManager().beginTransaction();transaction.addToBackStack(null);transaction.replace(R.id.setting_container,mSizeSelector, "picture_size_selector").commit();return true;}});mPref.setEnabled(mEnabled);if (mSelectedValue != null) {mSummary = PictureSizeHelper.getPixelsAndRatio(mSelectedValue);}}@Overridepublic void refreshView() {if (mPref != null) {LogHelper.d(TAG, "[refreshView]");mPref.setSummary(mSummary);mPref.setEnabled(mEnabled);}}@Overridepublic void unloadView() {LogHelper.d(TAG, "[unloadView]");}@Overridepublic void setEnabled(boolean enabled) {mEnabled = enabled;}@Overridepublic boolean isEnabled() {return mEnabled;}/*** Set listener to listen the changed picture size value.** @param listener The instance of {@link OnValueChangeListener}.*/public void setOnValueChangeListener(OnValueChangeListener listener) {mListener = listener;}/*** Set the default selected value.** @param value The default selected value.*/public void setValue(String value) {mSelectedValue = value;}/*** Set the picture sizes supported.** @param entryValues The picture sizes supported.*/public void setEntryValues(List<String> entryValues) {mEntryValues = entryValues;}@Overridepublic void onItemClick(String value) {mSelectedValue = value;mSummary = PictureSizeHelper.getPixelsAndRatio(value);if (mListener != null) {mListener.onValueChanged(value);}}
}

onItemClick

這里關注下這個 onItemClick 點擊方法，我們看類聲明如下：

PictureSizeSettingView implements ICameraSettingView,PictureSizeSelector.OnItemClickListener

所以 這個 onItemClick 方法其實是PictureSizeSelector 類的點擊方法的回調。

onPreferenceClick

先看源碼，如下：

  mPref.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {@Overridepublic boolean onPreferenceClick(android.preference.Preference preference) {mSizeSelector.setValue(mSelectedValue);mSizeSelector.setEntryValues(mEntryValues);FragmentTransaction transaction = mActivity.getFragmentManager().beginTransaction();transaction.addToBackStack(null);transaction.replace(R.id.setting_container,mSizeSelector, "picture_size_selector").commit();return true;}});

這個方法其實就做了三件事情：

• setValue 設置默認圖片大小
• setEntryValues 設置支持的所有圖片大小集合
• transaction.replace 操作，跳轉到PictureSizeSelector 界面
  這里其實就和PictureSizeSelector 完全關聯起來了。

接下來就要關注 兩個事情：

• mListener.onValueChanged(value); 在哪里設置回調的
• setValue 這個類里面也有設置默認圖片大小，到底在哪里設置的

PictureSize

源碼路徑：

/vendor/mediatek/proprietary/packages/apps/Camera2/feature/setting/picturesize/src/com/mediatek/camera/feature/setting/picturesize/PictureSize.java

如何關聯到這個類？
上面已經分析到了 PictureSizeSettingView 的 onValueChanged，其實就是要找 PictureSizeSettingView 中 接口 OnValueChangeListener 是在哪里實現的，這樣來找到具體的實現和調用地方。

先看類說明：
這里我們看下部分代碼片段截圖：

上面截圖就可以基本確認了，它對應的界面才是 照片設置圖，如下：

onValueInitialized

源代碼如下：

 /*** Invoked after setting's all values are initialized.** @param supportedPictureSize Picture sizes which is supported in current platform.*/public void onValueInitialized(List<String> supportedPictureSize) {LogHelper.d(TAG, "[onValueInitialized], supportedPictureSize:" + supportedPictureSize);double fullRatio = PictureSizeHelper.findFullScreenRatio(mActivity);List<Double> desiredAspectRatios = new ArrayList<>();desiredAspectRatios.add(fullRatio);desiredAspectRatios.add(PictureSizeHelper.RATIO_4_3);PictureSizeHelper.setDesiredAspectRatios(desiredAspectRatios);PictureSizeHelper.setFilterParameters(DEGRESSIVE_RATIO, MAX_COUNT);if (sFilterPictureSize) {supportedPictureSize = PictureSizeHelper.filterSizes(supportedPictureSize);LogHelper.d(TAG, "[onValueInitialized], after filter, supportedPictureSize = "+ supportedPictureSize);}if (FILTER_MODE.equals(mModeKey)|| VFB_MODE.equals(mModeKey)|| FB_MODE.equals(mModeKey)) {//for low romif ((VFB_MODE.equals(mModeKey)||FILTER_MODE.equals(mModeKey))&& isLowRam()) {List<String> supportedPictureSizeAfterCheck = new ArrayList<String>();for (String pictureSize : supportedPictureSize) {String[] size = pictureSize.split("x");int width = Integer.parseInt(size[0]);int height = Integer.parseInt(size[1]);if (width < PICTURE_SIZE_9M_WIDTH&& height < PICTURE_SIZE_9M_HEIGHT) {supportedPictureSizeAfterCheck.add(pictureSize);}}supportedPictureSize = supportedPictureSizeAfterCheck;LogHelper.d(TAG, "[onValueInitialized], low ram, after check, " +"supportedPictureSize:"+ supportedPictureSize);} else {List<String> supportedPictureSizeAfterCheck = new ArrayList<String>();for (String pictureSize : supportedPictureSize) {String[] size = pictureSize.split("x");int width = Integer.parseInt(size[0]);int height = Integer.parseInt(size[1]);if (width <= PictureSizeHelper.getMaxTexureSize()&& height <= PictureSizeHelper.getMaxTexureSize()) {supportedPictureSizeAfterCheck.add(pictureSize);}}supportedPictureSize = supportedPictureSizeAfterCheck;LogHelper.d(TAG, "[onValueInitialized], GPU Mode, after check, " +"supportedPictureSize:"+ supportedPictureSize);}}if (HDR_MODE.equals(mModeKey)) {List<String> supportedPictureSizeAfterCheck = new ArrayList<String>();for (String pictureSize : supportedPictureSize) {for (String yuvSize:mYUVsupportedSize){if(pictureSize.equals(yuvSize)){supportedPictureSizeAfterCheck.add(pictureSize);}}}supportedPictureSize=supportedPictureSizeAfterCheck;LogHelper.d(TAG, "[onValueInitialized], PostAlgo Mode, after check, supportedPictureSize:"+ supportedPictureSize);}if (AIBEAUTYPHOTO_MODE.equals(mModeKey)|| AIBOKEHPHOTO_MODE.equals(mModeKey)|| AICOLORPHOTO_MODE.equals(mModeKey)|| AILEGGYPHOTO_MODE.equals(mModeKey)|| AISLIMMINGPHOTO_MODE.equals(mModeKey)) {List<String> supportedPictureSizeAfterCheck = new ArrayList<String>();for (String pictureSize : supportedPictureSize) {String[] size = pictureSize.split("x");int width = Integer.parseInt(size[0]);int height = Integer.parseInt(size[1]);if (width <= PictureSizeHelper.getMaxTexureSize()&& height <= PictureSizeHelper.getMaxTexureSize()) {supportedPictureSizeAfterCheck.add(pictureSize);}}supportedPictureSize = supportedPictureSizeAfterCheck;LogHelper.d(TAG, "[onValueInitialized], mModeKey:" + mModeKey + ",after check, supportedPictureSize:"+ supportedPictureSize);}setSupportedPlatformValues(supportedPictureSize);setSupportedEntryValues(supportedPictureSize);setEntryValues(supportedPictureSize);refreshViewEntry();String valueInStore = mDataStore.getValue(getKey(), null, getStoreScope());if (valueInStore != null&& !supportedPictureSize.contains(valueInStore)) {LogHelper.d(TAG, "[onValueInitialized], value:" + valueInStore+ " isn't supported in current platform");valueInStore = null;mDataStore.setValue(getKey(), null, getStoreScope(), false);}if (valueInStore == null) {// Default picture size is the max full-ratio size.LogHelper.d(TAG, "valueInStore == null  Default picture size is the max full-ratio size:");/*List<String> entryValues = getEntryValues();for (String value : entryValues) {if (PictureSizeHelper.getStandardAspectRatio(value) == fullRatio) {valueInStore = value;LogHelper.d(TAG, "valueInStore == null:valueInStore:"+valueInStore);break;}}*/valueInStore =PictureSizeHelper.getCustomDefault(getEntryValues());}// If there is no full screen ratio picture size, use the first value in// entry values as the default value.if (valueInStore == null) {valueInStore = getEntryValues().get(0);LogHelper.d(TAG, "valueInStore:valueInStore:"+valueInStore);}setValue(valueInStore);}

看方法注釋就一目了然了，根據當前平臺設置-初始化圖片大小

 /*** Invoked after setting's all values are initialized.** @param supportedPictureSize Picture sizes which is supported in current platform.*/

對于 valueInStore 的具體設置內容和關聯邏輯，這里暫不分析。

總結

• 實現了MTK Android13 平臺下默認圖片大小的邏輯
• 分析了解決問題的思路，源碼分析流程
• 建議對Camera2 相關知識需要一定的了解最好
• 在查看源碼的過程中，難免找不到關鍵字，不知道修改哪里。 可以借助IDE- AS VS 操作，方便定位源碼位置。