Android camera lost data

Answer 1

Android camera callbacks refer to the data obtained by setting a previewing callback for the Camera instance. For example, set `camera. setPreviewCall back (newCamer. PreviewCall back () { @Override publicvoidonPreviewframe(Byte[] data, Camera camera) {...}})` The `data` in is the raw data of the callbacks. These raw data could not be directly saved as images. They needed to be converted into commonly used image code data. By default, most of the data supported by the camera is in the NRV21 format. You can use `YuvImage` to process the data that is in YMV code, such as `YuvImage image = new YuvImage(data, ImageForm.NRV21, width, height, zero);`, and then compress it into Jpeg-format with `ByteArrayOutpuStream`. After that, you can convert it into new data for various operations, such as saving it as an image, converting it into a Bitmap, and so on.

In addition, Android provides two kinds of camera callbacks: Camera. picturecallback and Camera. previewcallback. The interface 'PictureCallback' is used to process the data of the captured photos, and the interface 'PreviewCallback' is used to process the data of the previews. When you use the camera callbacks to process data, you need to create and implement the corresponding methods in the code. For example, you need to create an implementation class object of 'Camera. Picture callback', and implement the' onPicture Taken ()'method in the implementation class to process the photo data after shooting.

At the same time, before you start to use the camera function, you need to add the corresponding permission and feature declaration in the `AndroidManifest.xml` file, such as ``, to access the camera device.
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