HwCameraKit为开发者提供了一套兼容EMUI的相机能力开放接口,开发者能够经过HwCameraKit使本身的应用快速接入华为相机的私有能力,扩展应用的拍摄功能,为用户提供更好拍摄体验。java
人像模式为HwCameraKit开放的多种相机模式其中之一,它将容许您:android
在本次CodeLab中,您将使用HwCameraKit创建一款Android相机应用程序,使其能够得到华为相机的人像拍摄功能,实现人像的虚化、美肤等效果。
普通拍摄(左) VS 人像模式开启虚化(右)web
硬件要求编程
软件要求app
Duration: 0:05
1. 在工程的Manifest文件中添加相关权限:机器学习
<uses-permission android:name="android.permission.CAMERA"/> <uses-permission android:name="android.permission.RECORD_AUDIO"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
2. 动态申请相关权限:异步
private static final String [] PERMISSIONS_ARRAY = new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA, Manifest.permission.RECORD_AUDIO, Manifest.permission.ACCESS_FINE_LOCATION }; private static List<String> permissionsList = new ArrayList<>(PERMISSIONS_ARRAY.length); /** * 动态请求WRITE_EXTERNAL_STORAGE CAMERA RECORD_AUDIO权限 * * @param activity 应用activity */ public static void requestPermission (final Activity activity) { for (String permission : PERMISSIONS_ARRAY) { if (ContextCompat.checkSelfPermission(activity, permission) != PackageManager.PERMISSION_GRANTED) { permissionsList.add(permission); } } ActivityCompat.requestPermissions(activity, permissionsList.toArray(new String [permissionsList.size()]), REQUEST_CODE_ASK_PERMISSIONS); }
Duration: 0:60
经过IDE提供的功能卡片,能够快速获取示例代码并将其添加到工程中,以人像模式为例,找到人像能力卡片:可经过Tools->EMUI Kits->Kit Assistant->Camera->Portrait Mode 来找到该卡片。ide
提示:本次Codelabs提供了配套的app开发工程,请使用IDE工具导入,并根据以下步骤,实现提供的配套工程中带有/* TODO */注释的方法,从而快速集成人像模式。svg
private @Mode.Type int mCurrentModeType; private CameraKit mCameraKit; private ModeCharacteristics mModeCharacteristics; private void createMode() { mCameraKit = CameraKit.getInstance(getApplicationContext()); if (mCameraKit == null) { Log.e(TAG, "This device does not support CameraKit!"); } /** Query camera id list*/ String[] cameraLists = mCameraKit . getCameraIdList (); if ((cameraLists != null) && (cameraLists.length > 0)) { Log.i(TAG, "Try to use camera with id " + cameraLists[0]); /** Query supported modes of this device*/ int[] modes = mCameraKit . getSupportedModes (cameraLists[0]); if (!Arrays.stream(modes).anyMatch((i) -> i == mCurrentModeType)) { Log.w(TAG, "Current mode is not supported in this device!"); return; } mCameraKit.createMode(cameraLists[0], mCurrentModeType, mModeStateCallback, mCameraKitHandler); } }
从mModeStateCallback的onCreated回调后,可从入参可得到人像Mode实例工具
/** 在onCreated回调中获取mode对象,而后以行为的状态回调和数据回调及对应的线程为入参,初始化ModeConfig.Builder,配置预览的surface和拍照的大小,经过configure命令将配置项设置到mMode中,进行模式的激活*/ private void configMode() { Log.i(TAG, "configMode begin"); /** Query supported preview size*/ List<Size> previewSizes = mModeCharacteristics.getSupportedPreviewSizes(SurfaceTexture.class); /** Query supported capture size*/ List<Size> captureSizes = mModeCharacteristics.getSupportedCaptureSizes(ImageFormat.JPEG); Log.d(TAG, "configMode: captureSizes = " + captureSizes.size() + ";previewSizes=" + previewSizes.size()); /** Use the first one or default 4000x3000*/ mCaptureSize = captureSizes.stream().findFirst().orElse(new Size(4000, 3000)); /** Use the same ratio with preview*/ mPreviewSize = previewSizes.stream().filter((size) -> Math.abs((1.0f * size.getHeight() / size.getWidth()) - (1.0f * mCaptureSize.getHeight() / mCaptureSize.getWidth())) < 0.01).findFirst().get(); Log.i(TAG, "configMode: mCaptureSize = " + mCaptureSize + ";mPreviewSize=" + mPreviewSize); /** Update view*/ runOnUiThread(() -> mTextureView.setAspectRatio(mPreviewSize.getHeight(), mPreviewSize.getWidth())); SurfaceTexture texture = mTextureView.getSurfaceTexture(); if (texture == null) { Log.e(TAG, "configMode: texture=null!"); return; } /** Set buffer size of view*/ texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight()); /** Get surface of texture*/ Surface surface = new Surface(texture); /** Add preview and capture parameters to config builder*/ modeConfigBuilder.addPreviewSurface(surface).addCaptureImage(mCaptureSize, ImageFormat.JPEG); /** Set callback for config builder*/ modeConfigBuilder.setDataCallback(actionDataCallback, mCameraKitHandler); modeConfigBuilder.setStateCallback(actionStateCallback, mCameraKitHandler); /** Configure mode*/ mMode.configure(); Log.i(TAG, "configMode end"); }
使用构造器ModeConfig.Builder配置模式的状态回调及数据回调及执行回调所在的Handler。从状态回调中,开发者能够获取如启动预览后状态变化、拍照结束状态、手动对焦结束、人脸检测结果返回等信息;从数据回调中,开发者可获取模式动做执行过程当中产生数据结果(如拍照图像数据等)。还可经过ModeConfig.Builder配置预览Surface及拍照分辨率。
/* 在接收到到onConfigured回调后,说明mode配置成功,模式进入开启状态,此时调用startPreview命令开启预览。*/ private void startPreview() { mMode.startPreview(); }
/* 用户能够经过ModeCharacteristics#getSupportedParameters查询当前模式下支持的参数(以人像模式为例:支持背景虚化,美肤等),经过ModeCharacteristics#getParameterRange查询参数支持的取值范围,经过Mode#setParameter设置对应效果。*/ /* 设置人像虚化 */ mMode.setParameter(RequestKey.HW_PORTRAIT_SPOTS_BOKEH, validValue); /* 设置美肤:皮肤光滑 */ int[] smoothLevels = modeCharacteristics.getSupportedBeauty(Metadata.BeautyType.HW_BEAUTY_SKIN_SMOOTH); if (smoothLevels != null && smoothLevels.length != 0) { mMode.setBeauty(Metadata.BeautyType.HW_BEAUTY_SKIN_SMOOTH,smoothLevels[smoothLevels.length - 1]); } /* 用户能够经过设计按钮等方式,调用takePicture进行拍照,异步经过onImageAvailable回调,返回照片Image数据。*/ mMode.takePicture();
/* 以数据回调为例,在拍照后从回调里获取图片 */ private final ActionDataCallback actionDataCallback = new ActionDataCallback() { @Override public void onImageAvailable(Mode mode, int id, Image image) { super.onImageAvailable(mode, id, image); Log.d(TAG, "onImageAvailable"); new ImageSaver(image, mFile, CameraKitActivity.this).run(); } };
提示:除了从ActionDataCallback获取拍照图片等数据之外,从ActionStateCallback中还可获取模式动做执行过程当中,执行状态结果的回调处理,如启动预览后状态变化、拍照结束状态、手动对焦结束、人脸检测结果返回等。
/* 应用切后台,须要将模式释放 */ @Override protected void onPause() { if (mBackgroundHandler != null) { mBackgroundHandler.post(new Runnable() { @Override public void run() { if (mMode != null) { mMode.release(); mMode = null; } } }); } super.onPause(); }
更多HwCameraKit相关信息请关注咱们的官网:
https://developer.huawei.com/consumer/cn/CameraKit
往期连接:Android | 教你如何快速集成机器学习能力
内容来源:https://developer.huawei.com/consumer/cn/forum/topicview?tid=0201234569803940158&fid=3467 原做者:艾罗门特