Android Open Source - barcodescanner Barcode Scanner View

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Back to project page barcodescanner.
License

The source code is released under:
Apache License
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Java Source Code

package me.dm7.barcodescanner.core;
/* w w  w. j a  v a2 s  . c o m*/
import android.content.Context;
import android.graphics.Point;
import android.graphics.Rect;
import android.hardware.Camera;
import android.os.AsyncTask;
import android.util.AttributeSet;
import android.widget.FrameLayout;

public abstract class BarcodeScannerView extends FrameLayout implements Camera.PreviewCallback  {
    private Camera mCamera;
    private CameraPreview mPreview;
    private ViewFinderView mViewFinderView;
    private Rect mFramingRectInPreview;

    public BarcodeScannerView(Context context) {
        super(context);
        setupLayout();
    }

    public BarcodeScannerView(Context context, AttributeSet attributeSet) {
        super(context, attributeSet);
        setupLayout();
    }

    public void setupLayout() {
        mPreview = new CameraPreview(getContext());
        mViewFinderView = new ViewFinderView(getContext());
        addView(mPreview);
        addView(mViewFinderView);
    }

    public void startCamera() {
        mCamera = CameraUtils.getCameraInstance();
        if(mCamera != null) {
            mViewFinderView.setupViewFinder();
            mPreview.setCamera(mCamera, this);
            mPreview.initCameraPreview();
        }
    }

    public void stopCamera() {
        if(mCamera != null) {
            mPreview.stopCameraPreview();
            mPreview.setCamera(null, null);
            mCamera.release();
            mCamera = null;
        }
    }

    public synchronized Rect getFramingRectInPreview(int width, int height) {
        if (mFramingRectInPreview == null) {
            Rect framingRect = mViewFinderView.getFramingRect();
            if (framingRect == null) {
                return null;
            }
            Rect rect = new Rect(framingRect);
            Point screenResolution = DisplayUtils.getScreenResolution(getContext());
            Point cameraResolution = new Point(width, height);

            if (cameraResolution == null || screenResolution == null) {
                // Called early, before init even finished
                return null;
            }

            rect.left = rect.left * cameraResolution.x / screenResolution.x;
            rect.right = rect.right * cameraResolution.x / screenResolution.x;
            rect.top = rect.top * cameraResolution.y / screenResolution.y;
            rect.bottom = rect.bottom * cameraResolution.y / screenResolution.y;

            mFramingRectInPreview = rect;
        }
        return mFramingRectInPreview;
    }

    public void setFlash(boolean flag) {
        if(mCamera != null && CameraUtils.isFlashSupported(mCamera)) {
            Camera.Parameters parameters = mCamera.getParameters();
            if(flag) {
                if(parameters.getFlashMode().equals(Camera.Parameters.FLASH_MODE_TORCH)) {
                    return;
                }
                parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
            } else {
                if(parameters.getFlashMode().equals(Camera.Parameters.FLASH_MODE_OFF)) {
                    return;
                }
                parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
            }
            mCamera.setParameters(parameters);
        }
    }

    public boolean getFlash() {
        if(mCamera != null && CameraUtils.isFlashSupported(mCamera)) {
            Camera.Parameters parameters = mCamera.getParameters();
            if(parameters.getFlashMode().equals(Camera.Parameters.FLASH_MODE_TORCH)) {
                return true;
            } else {
                return false;
            }
        }
        return false;
    }

    public void toggleFlash() {
        if(mCamera != null && CameraUtils.isFlashSupported(mCamera)) {
            Camera.Parameters parameters = mCamera.getParameters();
            if(parameters.getFlashMode().equals(Camera.Parameters.FLASH_MODE_TORCH)) {
                parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
            } else {
                parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
            }
            mCamera.setParameters(parameters);
        }
    }

    public void setAutoFocus(boolean state) {
        if(mPreview != null) {
            mPreview.setAutoFocus(state);
        }
    }
}
Java Source Code List
