HarmonyOS 鸿蒙Next Camera相机开发，能否设置预览流分辨率？

要全屏还要不变形，需要获取手机的宽高比，用手机的屏幕的height /width去和支持的预览尺寸的 width/ height 去取最贴近的值，并使得surface和XComponent的宽高相同

使用下列代码获取设备支持的宽和高，然后根据手机屏幕的宽高设置最合适的预览流分辨率，并且使得surface和XComponent的宽高相同。

//预览流与录像输出流的分辨率的宽高比要保持一致
let previewProfilesArray: Array<camera.Profile> = cameraOutputCap.previewProfiles;

let position: number = 0;
if (previewProfilesArray != null) {
 previewProfilesArray.forEach((value: camera.Profile, index: number) => {
   // 查看支持的预览尺寸
   console.info(TAG, `支持的预览尺寸: [${value.size.width},${value.size.height},${value.size.width / value.size.height }]`);
   if (value.size.width === 2592 && value.size.height === 1200) {
     position = index;
   }
 })
} else {
 console.error(TAG, "createOutput photoProfilesArray == null || undefined");
}

let photoProfilesArray: Array<camera.Profile> = cameraOutputCap.photoProfiles;
if (!photoProfilesArray) {
 console.error(TAG, "createOutput photoProfilesArray == null || undefined");
}

this.xComponentWidth = previewProfilesArray[position].size.width;
this.xComponentHeight = previewProfilesArray[position].size.height;

this.mXComponentController.setXComponentSurfaceSize({
 surfaceWidth: this.xComponentWidth,
 surfaceHeight: this.xComponentHeight
});
// 创建预览输出流,其中参数 surfaceId 参考上文 XComponent 组件，预览流为XComponent组件提供的surface
try {
 previewOutput = cameraManager.createPreviewOutput(previewProfilesArray[position], surfaceId);
} catch (error) {
 let err = error as BusinessError;
 console.error(TAG, `Failed to create the PreviewOutput instance. error code: ${err.code}`);
}
if (previewOutput === undefined) {
 return;
}

// 监听预览输出错误信息
previewOutput.on('error', (error: BusinessError) => {
 console.error(TAG, `Preview output error code: ${error.code}`);
});

// 创建ImageReceiver对象，并设置照片参数：分辨率大小是根据前面 photoProfilesArray 获取的当前设备所支持的拍照分辨率大小去设置
let imageReceiver: image.ImageReceiver = image.createImageReceiver(2592, 1200, 4, 8);