Android Open Source - CamTimer A R Manager

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License

The source code is released under:
GNU General Public License
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Java Source Code

package com.dozingcatsoftware.util;
/* w  w  w.j av a  2s  .  c  o  m*/
import android.app.Activity;
import android.hardware.Camera;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class ARManager implements SurfaceHolder.Callback {
  
  Activity activity;
  SurfaceView cameraView;
  Camera.PreviewCallback previewCallback;
  Runnable cameraOpenedCallback;
  Runnable cameraStartedCallback;
  boolean cameraInitialized = false;
  
  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;
  }
  
  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 void setCameraStartedCallback(Runnable callback) {
    cameraStartedCallback = callback;
  }
  
  public boolean startCamera() {
    if (camera==null) {
      try {
              camera = CameraUtils.openCamera(cameraId);
              if (!cameraInitialized && 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();
              if (!cameraInitialized && cameraStartedCallback!=null) {
                cameraStartedCallback.run();
              }
              cameraInitialized = true;
      }
      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;
      this.cameraInitialized = false;
      startCameraIfVisible();
    }

    public void switchToNextCamera() {
      switchToCamera((cameraId + 1) % CameraUtils.numberOfCameras());
    }
  
    // 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
