Android 13.0 MTK Camera2 设置默认拍照尺寸功能实现

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需求：

默认相机拍照尺寸

需求原因
1）客户自身喜好
2）部分客户自己的摄像头不兼容，比如拍照尺寸太大会卡顿，拉丝等现象

参考资料

Android 13.0 MTK Camera2 设置默认拍照尺寸功能实现
Android 11.0 MTK Camera2 设置默认拍照尺寸功能实现

这两篇文章介绍的蛮好的，可以看看，对于类似需求同理也可以按照改一改？ 为什么有些会默认最高分辨率拍照，可能原因在于手机端产品为了最好的拍摄效果，尺寸会默认到最大。

对于Camera2 开发，遇到的困难点就是源码代码量太多，对于很多同事来说就是一脸懵逼，建议多积累一定的代码量，掌握基本的知识。

架构图了解

MTKCamera2相机架构
Camera2架构
Android Camera架构简析

Camera相关专栏

Camera Framework 专栏
小驰私房菜系列
小驰私房菜MTK系列
小驰Camera 开发系列
Camera 相机开发
展讯平台 Camera
官方文档：谷歌官方 API 描述

零散知识了解

MTK 相机UI介绍
Camera2 相机认知
Camera2学习笔记
camera2关于拍照预览方向旋转90度和拍照图片镜像功能实现
Camera2 预览集成、简单拍照：熟悉预览步骤流程比较有用
Camera镜像上下左右颠倒问题的解决办法
MTK相机成像质量差
Camera应用分析

部分相机源码参考，学习API使用，梳理流程，偏应用层

极客相机 Camera2 API
Camera2 API详解
极客相机源码
Camera2 相机Demo
Camera2 专业相机Demo
拍照、预览、录像Demo
使用Camera2 拍照

Camera2 系统相关

Camera2 Service 启动

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

修改内容：

PictureSize.java onValueInitialized 方法

在 onValueInitialized 方法中，默认valueInStore 中调用PictureSizeHelper 类中自定义的 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

自定义 getCustomDefault 方法，设置默认分辨率。 这里直接写死，或者 根据客需要求设置为最大、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";}

源码分析

设置拍照尺寸的核心类

\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

源码逐步分析

关联的照片大小搜索

grep -rn 照片大小

找到如下路径相关关键字：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

上面已经找到了两个关键字，这里先根据第一个关键字找一下源码：
路径：

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

R.string.pref_camera_picturesize_title

我们看类定义：

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

就是图片大小选择器
对应的是如下界面：

既然是这个界面，那就看一下点击选中方法和进入这个界面的设置方法

进入界面选中的逻辑

这里关联的有四个方法，对应的进入界面选中逻辑：

@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	设置支持的图片大小 分辨率
prepareValuesOnShown	准备显示的数据 在onCreate 方法里面调用的
setValue	设置默认选择的值
onCreate	通过setEntryValue 设置的集合，遍历创建PreferenceScreen ，对于传递进来的value 作为选中效果

点击选中图片大小逻辑

对于点击逻辑更为简单，回调 返回上一层，代码如下：

   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 上面已经找到了两个关键字，这里先根据第二个关键字找一下源码：
路径：

./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看源码发现和 PictureSizeSelector 代码基本一致 ，但是仔细看一个方法的说明如下：/*** Set the video quality supported.* @param entryValues The video quality supported.*/public void setEntryValues(List<String> entryValues) {mEntryValues.clear();mEntryValues.addAll(entryValues);}这些事设置Vieo 的  并不是设置picture 的。 所以我们需求设置图片质量的其实应该是上面找到的 PictureSizeSelector 

PictureSizeSettingView

路径：

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

找到这个类的方法有两种

• grep 查找关键字 “照片大小”
• 根据上面定位到的源码 PictureSizeSelector

就是进入到 PictureSizeSelector 界面之前的页面，如下：

准确的来说， PictureSizeSettingView 对应的其实是这个界面中 图片大小的这个item .
源码代码量不多，我们赋上来看看：

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

这里关注下这个 onItemClick 点击方法，我们看类声明如下：

PictureSizeSettingView implements ICameraSettingView,PictureSizeSelector.OnItemClickListener

所以 这个 onItemClick 方法其实是PictureSizeSelector 类的点击方法的回调。

onPreferenceClick

先看源码，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;}});

这个方法其实就做了三件事情：

• setValue 设置默认图片大小
• setEntryValues 设置支持的所有图片大小集合
• transaction.replace 操作，跳转到PictureSizeSelector 界面
  这里其实就和PictureSizeSelector 完全关联起来了。

接下来就要关注 两个事情：

• mListener.onValueChanged(value); 在哪里设置回调的
• setValue 这个类里面也有设置默认图片大小，到底在哪里设置的

PictureSize

源码路径：

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

如何关联到这个类？
上面已经分析到了 PictureSizeSettingView 的 onValueChanged，其实就是要找 PictureSizeSettingView 中 接口 OnValueChangeListener 是在哪里实现的，这样来找到具体的实现和调用地方。

先看类说明：
这里我们看下部分代码片段截图：

上面截图就可以基本确认了，它对应的界面才是 照片设置图，如下：

onValueInitialized

源代码如下：

 /*** 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);}

看方法注释就一目了然了，根据当前平台设置-初始化图片大小

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

对于 valueInStore 的具体设置内容和关联逻辑，这里暂不分析。

总结

• 实现了MTK Android13 平台下默认图片大小的逻辑
• 分析了解决问题的思路，源码分析流程
• 建议对Camera2 相关知识需要一定的了解最好
• 在查看源码的过程中，难免找不到关键字，不知道修改哪里。 可以借助IDE- AS VS 操作，方便定位源码位置。