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，并使surface和XComponent的宽高一致。
//The aspect ratio of the preview stream and the video output stream resolution should be consistent
let previewProfilesArray: Array<camera.Profile> = cameraOutputCap.previewProfiles;
let position: number = 0;
if (previewProfilesArray != null) {
previewProfilesArray.forEach((value: camera.Profile,index: number) => {
// View supported preview sizes
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
});
// Create a preview output stream, where the parameter surfaceId refers to the XComponent component mentioned earlier,
// and the preview stream is the surface provided by the XComponent component
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;
}
// Monitor preview output error message
previewOutput.on('error',(error: BusinessError) => {
console.error(TAG,`Preview output error code: ${error.code}`);
});
// Create an ImageReceiver object and set photo parameters:
// The resolution size is set based on the current device's supported photo resolution size obtained from the previous photoProfilesArray
let size: image.Size = {
height: 1200,
width: 2592
}
let imageReceiver: image.ImageReceiver = image.createImageReceiver(size,4,8);