Android Open Source - AsciiCamera A R Manager

• Back to Camera/save  ↑

From Project

Back to project page AsciiCamera.

License

The source code is released under:

Apache License

Java Source Code

// Copyright (C) 2014 Bruno Ramalhete
//from   w  w w .ja va 2s. com
package com.spectralsoftware.util;

import android.app.Activity;
import android.hardware.Camera;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

/**
 * This class handles initializing, starting, and stopping the camera. An Activity using this class must provide the 
 * SurfaceView that the camera preview will draw into, and a Camera.PreviewCallback to process the data for each 
 * preview frame. It also needs to call startCamera() and stopCamera() when needed, such as in onResume and onPause.
 */
public class ARManager implements SurfaceHolder.Callback {
    
    Activity activity;
    SurfaceView cameraView;
    Camera.PreviewCallback previewCallback;
    Runnable cameraOpenedCallback;
    
    Camera camera;
    boolean cameraViewReady = false;
    int cameraId = 0;

    int preferredPreviewWidth = 0, preferredPreviewHeight = 0;
    int numPreviewCallbackBuffers = 0;
    
    public ARManager(Activity _activity, SurfaceView _cameraView, Camera.PreviewCallback _previewCallback) {
        this.activity = _activity;
        this.cameraView = _cameraView;
        this.previewCallback = _previewCallback;
    }
    
    @SuppressWarnings("deprecation")
  public void setupCameraView() {
        cameraView.getHolder().addCallback(this);
        cameraView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }
    
    public static ARManager createAndSetupCameraView(Activity _activity, SurfaceView _cameraView, Camera.PreviewCallback _previewCallback) {
        ARManager manager = new ARManager(_activity, _cameraView, _previewCallback);
        manager.setupCameraView();
        return manager;
    }
    
    public void setPreferredPreviewSize(int width, int height) {
        this.preferredPreviewWidth = width;
        this.preferredPreviewHeight = height;
    }
    
    public void setNumberOfPreviewCallbackBuffers(int n) {
        this.numPreviewCallbackBuffers = n;
    }
    
    public void setCameraOpenedCallback(Runnable callback) {
        cameraOpenedCallback = callback;
    }
    
    public boolean startCamera() {
        if (camera==null) {
            try {
                camera = CameraUtils.openCamera(cameraId);
                if (cameraOpenedCallback!=null) {
                    cameraOpenedCallback.run();
                }
                camera.setPreviewDisplay(cameraView.getHolder());
                if (preferredPreviewWidth>0 && preferredPreviewHeight>0) {
                    CameraUtils.setNearestCameraPreviewSize(camera, preferredPreviewWidth, preferredPreviewHeight);
                }

                if (numPreviewCallbackBuffers > 0) {
                    CameraUtils.createPreviewCallbackBuffers(camera, this.numPreviewCallbackBuffers);
                    CameraUtils.setPreviewCallbackWithBuffer(camera, this.previewCallback);
                }
                else {
                    camera.setPreviewCallback(this.previewCallback);
                }
                camera.startPreview();
            }
            catch(Exception ex) {
                camera = null;
            }
        }
        return (camera!=null);
    }

    
    public void startCameraIfVisible() {
        if (cameraViewReady) {
            startCamera();
        }
    }
    
    public void stopCamera() {
        if (camera!=null) {
            camera.setPreviewCallback(null);
            camera.stopPreview();
            camera.release();
            camera = null;
        }
    }
    
    public void switchToCamera(int _cameraId) {
        if (camera!=null) {
            stopCamera();
        }
        this.cameraId = _cameraId;
        startCameraIfVisible();
    }

    public void switchToNextCamera() {
        switchToCamera((cameraId + 1) % CameraUtils.numberOfCameras());
    }
    
    public boolean isCameraFrontFacing() {
        return CameraUtils.cameraIsFrontFacing(cameraId);
    }
    
    // SurfaceHolder callbacks
    @Override 
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        this.cameraViewReady = true;
        startCameraIfVisible();
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        // all done in surfaceChanged
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        this.cameraViewReady = false;
        stopCamera();
    }

    
    public Camera getCamera() {
        return camera;
    }
    public int getCameraId() {
        return cameraId;
    }

}

Java Source Code List

• Back to Camera/save  ↑