android-camera

问题 I've worked on this for days now. I have an OpenCV/JavaCameraView-based project I am trying to integrate with an Android android.hardware.camera2.CaptureRequest object I use to control the camera's sensitivity to light. The CameraBridgeViewBase.CvCameraViewListener2/JavaCameraView project works (I can see an image on the screen), and the CaptureRequest project works (see this, too), but combining the two technologies in a single project has proved a big problem. Has anyone gotten these two

问题 I've worked on this for days now. I have an OpenCV/JavaCameraView-based project I am trying to integrate with an Android android.hardware.camera2.CaptureRequest object I use to control the camera's sensitivity to light. The CameraBridgeViewBase.CvCameraViewListener2/JavaCameraView project works (I can see an image on the screen), and the CaptureRequest project works (see this, too), but combining the two technologies in a single project has proved a big problem. Has anyone gotten these two

问题 I can't figure out how to access the led light on my android with python or kivy, I have tried installing python-for-android to be able to import the android module into my code but it's not the module can't be found. I cloned python-for-android as instructed here. I didn't install the ndk or sdk as per that page as I thought since kivy already uses them they were already installed. Can someone please point me in the right direction? 回答1: Yes, you can write this app in Kivy from the desktop,

问题 I can't figure out how to access the led light on my android with python or kivy, I have tried installing python-for-android to be able to import the android module into my code but it's not the module can't be found. I cloned python-for-android as instructed here. I didn't install the ndk or sdk as per that page as I thought since kivy already uses them they were already installed. Can someone please point me in the right direction? 回答1: Yes, you can write this app in Kivy from the desktop,

问题 I want to encrypt video on the fly that android camera captures. So I need to tell android MediaRecorder to write it video stream to my CipherOutputStream . The problem is MediaRecorder.setOutputFile() method accepts only FileDescriptor and there is no way to get encrypting file descriptor from CipherOutputStream. So my question is how can I either emulate FileDescriptor to receive data writes and do encryption manually or somehow convince MediaRecorder to stream video into CipherOutputStream

问题 I use the following code to take picture from the android camera, after taking the pic onActivityResult is called with data parameter equals NULL. Code - public void getpic(View v){ Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); // Ensure that there's a camera activity to handle the intent if (takePictureIntent.resolveActivity(getPackageManager()) != null) { // Create the File where the photo should go File photoFile = null; try { photoFile = createImageFile(); }

问题 I am working on developing an Android applications that uses camera. To display the camera preview, I observed a lot of examples using surface view or texture view. Why are these preferred over using ImageView to display the camera preview? I have used Imageview to display the preview and it works fine. Thanks. 回答1: Please do not use ImageView for this. It is extremely inefficient, and I'd be surprised if you are able to produce high-resolution preview (1080p) with this approach. SurfaceView

问题 I am working on developing an Android applications that uses camera. To display the camera preview, I observed a lot of examples using surface view or texture view. Why are these preferred over using ImageView to display the camera preview? I have used Imageview to display the preview and it works fine. Thanks. 回答1: Please do not use ImageView for this. It is extremely inefficient, and I'd be surprised if you are able to produce high-resolution preview (1080p) with this approach. SurfaceView

问题 I am working on developing an Android applications that uses camera. To display the camera preview, I observed a lot of examples using surface view or texture view. Why are these preferred over using ImageView to display the camera preview? I have used Imageview to display the preview and it works fine. Thanks. 回答1: Please do not use ImageView for this. It is extremely inefficient, and I'd be surprised if you are able to produce high-resolution preview (1080p) with this approach. SurfaceView

问题 I am developing a custom camera application using the Android Camera2 API where you can switch between the different camera and video resolutions available in the phone. It also offers the possibility to take squared 1:1 pictures. To take the square pictures, I take a normal 4:3 picture and then crop it to maintain the 1:1. (So 4032x3024 would be 3024x3024). I noticed a problem when taking a 1:1 picture on certain resolutions, the output is slightly cropped (zoomed). This is the result of the