Android Open Source - zbar-android-sdk Camera Surface View

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License

The source code is released under:

MIT License

Java Source Code

package net.sourceforge.zbar.android.widget;
//w w w  .j a  v a  2s  .c  o  m
import net.sourceforge.zbar.android.CameraSupport;
import android.content.Context;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.PreviewCallback;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;

public class CameraSurfaceView extends SurfaceView implements
    SurfaceHolder.Callback {

  private CameraSupport mCameraSupport;
  private PreviewCallback mPreviewCallback;
  private AutoFocusCallback mAutoFocusCallback;
  private SurfaceHolder mHolder;

  public CameraSurfaceView(Context context) {
    super(context);
    mHolder = getHolder();
    mHolder.addCallback(this);
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    setCameraSupport(new CameraSupport());
    setVisibility(View.GONE);
  }

  public void setCameraSupport(CameraSupport camera) {
    if (camera.isOpen()) {
      throw new UnsupportedOperationException(
          "CameraSurfaceView cannot handle opened camera");
    }
    mCameraSupport = camera;
  }

  public void open(PreviewCallback previewCallback,
      AutoFocusCallback autoFocusCallback) {
    setCameraSupport(new CameraSupport());
    setVisibility(View.GONE);
    mPreviewCallback = previewCallback;
    mCameraSupport.open(previewCallback, autoFocusCallback);
    setVisibility(View.VISIBLE);
  }

  @Override
  public void surfaceChanged(SurfaceHolder holder, int format, int width,
      int height) {
    /*
     * If your preview can change or rotate, take care of those events here.
     * Make sure to stop the preview before resizing or reformatting it.
     */
    if (mHolder.getSurface() == null || !mCameraSupport.isOpen()) {
      // preview surface does not exist
      return;
    }

    mCameraSupport.stopPreview();

    try {
      // Hard code camera surface rotation 90 degs to match Activity view
      // in portrait
      mCameraSupport.setDisplayOrientation(90);
      mCameraSupport.setPreviewDisplay(mHolder);
      mCameraSupport.setPreviewCallback(mPreviewCallback);
      mCameraSupport.startPreview();
      mCameraSupport.setContinuousAutoFocus(true);
    } catch (Exception e) {
      Log.d("DBG", "Error starting camera preview: " + e.getMessage());
    }
  }

  @Override
  public void surfaceCreated(SurfaceHolder holder) {

  }

  @Override
  public void surfaceDestroyed(SurfaceHolder holder) {

  }

  public void release() {
    mCameraSupport.release();
  }

  public CameraSupport getCameraSupport() {
    return mCameraSupport;
  }

}

Java Source Code List

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