Last Updated:
Camera Engine为开发者提供了一套兼容EMUI的相机能力开放接口,开发者可以通过Camera Engine使自己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。
人像模式为Camera Engine开放的多种相机模式其中之一,它将允许您:
在本次CodeLab中,您将使用Camera Engine建立一款Android相机应用程序,使其可以获得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)
硬件要求
软件要求
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
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);
}
通过IDE提供的功能卡片,可以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:可通过EMUI->Kit Assistant->Media->Camera Engine->Portrait Mode 来找到该卡片
找到Camera Engine相关卡片
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,可从入参可获得人像Mode实例
/** 在onCreated回调中获取mode对象,然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,通过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,开发者可以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作执行过程中产生数据结果(如拍照图像数据等)。还可通过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();
}
/* 用户可以通过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),通过ModeCharacteristics#getParameterRange查询参数支持的取值范围,通过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]);
}
/* 用户可以通过设计按钮等方式,调用takePicture进行拍照,异步通过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();
}
};
/* 应用切后台,需要将模式释放 */
@Override
protected void onPause() {
if (mBackgroundHandler != null) {
mBackgroundHandler.post(new Runnable() {
@Override
public void run() {
if (mMode != null) {
mMode.release();
mMode = null;
}
}
});
}
super.onPause();
}
干得好,你已经成功完成了开发并学到了:
更多Camera Engine相关信息请关注我们的官网: