Android video app camera device setup

Nigel January 13, 2016 3:13 am

The android video app camera device setup tutorial describes how to create and initialise the android camera2 api CameraDevice which is a representation of the actual device’s camera.

This is one of the steps that has to be done before a connection to the camera can be made.

Get Code

The code to start this tutorial is on github here

https://github.com/mobapptuts/android_camera2_api_video_app.git Tag camera2-video-cameradevice

or you can run this command

git clone https://github.com/mobapptuts/android_camera2_api_video_app.git –branch camera2-video-cameradevice

Steps

Create members for the CameraDevice & CameraDevice.StateCallback

private CameraDevice mCameraDevice;
    private CameraDevice.StateCallback mCameraDeviceStateCallback = new CameraDevice.StateCallback() {
        @Override
        public void onOpened(CameraDevice camera) {

        }

        @Override
        public void onDisconnected(CameraDevice camera) {

        }

        @Override
        public void onError(CameraDevice camera, int error) {

        }
    };

Initialise the mCameraDevice in the onOpened method and clean up the camera resources in the onDisconnected & onError methods

private CameraDevice.StateCallback mCameraDeviceStateCallback = new CameraDevice.StateCallback() {
       @Override
       public void onOpened(CameraDevice camera) {
           mCameraDevice = camera;
       }

       @Override
       public void onDisconnected(CameraDevice camera) {
           camera.close();
           mCameraDevice = null;
       }

       @Override
       public void onError(CameraDevice camera, int error) {
           camera.close();
           mCameraDevice = null;
       }
   };

Create a closeCamera method to clean up the CameraDevice resources

private void closeCamera() {
      if(mCameraDevice != null) {
          mCameraDevice.close();
          mCameraDevice = null;
      }
  }

Now call the closeCamera method from the activity’s onPause method

@Override
    protected void onPause() {
        closeCamera();

        super.onPause();
    }