private void restartPreviewAndDecode() {
if (state == State.SUCCESS) {
state = State.PREVIEW;
CameraManager.get().requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
activity.drawViewfinder();
}
}
/**
* Decode the data within the viewfinder rectangle, and time how long it took. For efficiency,
* reuse the same reader objects from one decode to the next.
*
* @param data The YUV preview frame.
* @param width The width of the preview frame.
* @param height The height of the preview frame.
*/
private void decode(byte[] data, int width, int height) {
long start = System.currentTimeMillis();
Result rawResult = null;
PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(data, width, height);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
try {
rawResult = multiFormatReader.decodeWithState(bitmap);
} catch (ReaderException re) {
// continue
} finally {
multiFormatReader.reset();
}
if (rawResult != null) {
long end = System.currentTimeMillis();
Log.d(TAG, "Found barcode (" + (end - start) + " ms):\n" + rawResult.toString());
Message message = Message.obtain(activity.getHandler(), R.id.decode_succeeded, rawResult);
Bundle bundle = new Bundle();
bundle.putParcelable(DecodeThread.BARCODE_BITMAP, source.renderCroppedGreyscaleBitmap());
message.setData(bundle);
// Log.d(TAG, "Sending decode succeeded message...");
message.sendToTarget();
} else {
Message message = Message.obtain(activity.getHandler(), R.id.decode_failed);
message.sendToTarget();
}
}
@Override
protected void onPause() {
super.onPause();
if (handler != null) {
handler.quitSynchronously();
handler = null;
}
CameraManager.get().closeDriver();
}
@Override
public void handleMessage(Message message) {
switch (message.what) {
case R.id.auto_focus:
// Log.d(TAG, "Got auto-focus message");
// When one auto focus pass finishes, start another. This is the closest thing to
// continuous AF. It does seem to hunt a bit, but I'm not sure what else to do.
if (state == State.PREVIEW) {
CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
}
break;
case R.id.restart_preview:
Log.d(TAG, "Got restart preview message");
restartPreviewAndDecode();
break;
case R.id.decode_succeeded:
Log.d(TAG, "Got decode succeeded message");
state = State.SUCCESS;
Bundle bundle = message.getData();
Bitmap barcode =
bundle == null ? null : (Bitmap) bundle.getParcelable(DecodeThread.BARCODE_BITMAP);
activity.handleDecode((Result) message.obj, barcode);
break;
case R.id.decode_failed:
// We're decoding as fast as possible, so when one decode fails, start another.
state = State.PREVIEW;
CameraManager.get().requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
break;
case R.id.return_scan_result:
Log.d(TAG, "Got return scan result message");
activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
activity.finish();
break;
case R.id.launch_product_query:
Log.d(TAG, "Got product query message");
String url = (String) message.obj;
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
activity.startActivity(intent);
break;
}
}
public void quitSynchronously() {
state = State.DONE;
CameraManager.get().stopPreview();
Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
quit.sendToTarget();
try {
decodeThread.join();
} catch (InterruptedException e) {
// continue
}
// Be absolutely sure we don't send any queued up messages
removeMessages(R.id.decode_succeeded);
removeMessages(R.id.decode_failed);
}
CaptureActivityHandler(
CaptureActivity activity, Collection<BarcodeFormat> decodeFormats, String characterSet) {
this.activity = activity;
decodeThread =
new DecodeThread(
activity,
decodeFormats,
characterSet,
new ViewfinderResultPointCallback(activity.getViewfinderView()));
decodeThread.start();
state = State.SUCCESS;
// Start ourselves capturing previews and decoding.
CameraManager.get().startPreview();
restartPreviewAndDecode();
}
private void initCamera(SurfaceHolder surfaceHolder) {
try {
CameraManager.get().openDriver(surfaceHolder);
// Creating the handler starts the preview, which can also throw a RuntimeException.
if (handler == null) {
handler = new CaptureActivityHandler(this, decodeFormats, characterSet);
}
} catch (IOException ioe) {
Log.w(TAG, ioe);
displayFrameworkBugMessageAndExit();
} catch (RuntimeException e) {
// Barcode Scanner has seen crashes in the wild of this variety:
// java.?lang.?RuntimeException: Fail to connect to camera service
Log.w(TAG, "Unexpected error initializating camera", e);
displayFrameworkBugMessageAndExit();
}
}
/**
* Decode the data within the viewfinder rectangle, and time how long it took. For efficiency,
* reuse the same reader objects from one decode to the next.
*
* @param data The YUV preview frame.
* @param width The width of the preview frame.
* @param height The height of the preview frame.
*/
private void decode(byte[] data, int width, int height) {
long start = System.currentTimeMillis();
Result rawResult = null;
// XXX modify here
byte[] rotatedData = new byte[data.length];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++)
rotatedData[x * height + height - y - 1] = data[x + y * width];
}
int tmp = width; // Here we are swapping, that's the difference to #11
width = height;
height = tmp;
PlanarYUVLuminanceSource source =
CameraManager.get().buildLuminanceSource(rotatedData, width, height);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
try {
rawResult = multiFormatReader.decodeWithState(bitmap);
} catch (ReaderException re) {
// continue
} finally {
multiFormatReader.reset();
}
if (rawResult != null) {
long end = System.currentTimeMillis();
Log.d(TAG, "Found barcode (" + (end - start) + " ms):\n" + rawResult.toString());
Message message =
Message.obtain(activity.getHandler(), R.id.zandroid_zxing_decode_succeeded, rawResult);
Bundle bundle = new Bundle();
bundle.putParcelable(DecodeThread.BARCODE_BITMAP, source.renderCroppedGreyscaleBitmap());
message.setData(bundle);
// Log.d(TAG, "Sending decode succeeded message...");
message.sendToTarget();
} else {
Message message = Message.obtain(activity.getHandler(), R.id.zandroid_zxing_decode_failed);
message.sendToTarget();
}
}
@Override
public void onDraw(Canvas canvas) {
Rect frame = CameraManager.get().getFramingRect();
if (frame == null) {
return;
}
int width = canvas.getWidth();
int height = canvas.getHeight();
// these are modifications to force the
// view frame to be centered vertically
frame = new Rect(frame);
int frameHeight = frame.height();
frame.top = (height - frame.height()) / 2;
frame.bottom = frame.top + frameHeight;
// Draw the exterior (i.e. outside the framing rect) darkened
paint.setColor(resultBitmap != null ? resultColor : maskColor);
canvas.drawRect(0, 0, width, frame.top, paint);
canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, paint);
canvas.drawRect(0, frame.bottom + 1, width, height, paint);
if (resultBitmap != null) {
// Draw the opaque result bitmap over the scanning rectangle
paint.setAlpha(OPAQUE);
canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
} else {
// Draw a two pixel solid black border inside the framing rect
paint.setColor(frameColor);
canvas.drawRect(frame.left, frame.top, frame.right + 1, frame.top + 2, paint);
canvas.drawRect(frame.left, frame.top + 2, frame.left + 2, frame.bottom - 1, paint);
canvas.drawRect(frame.right - 1, frame.top, frame.right + 1, frame.bottom - 1, paint);
canvas.drawRect(frame.left, frame.bottom - 1, frame.right + 1, frame.bottom + 1, paint);
// Draw a red "laser scanner" line through the middle to show decoding is active
paint.setColor(laserColor);
paint.setAlpha(SCANNER_ALPHA[scannerAlpha]);
scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length;
int middle = frame.height() / 2 + frame.top;
canvas.drawRect(frame.left + 2, middle - 1, frame.right - 1, middle + 2, paint);
Collection<ResultPoint> currentPossible = possibleResultPoints;
Collection<ResultPoint> currentLast = lastPossibleResultPoints;
if (currentPossible.isEmpty()) {
lastPossibleResultPoints = null;
} else {
possibleResultPoints = new HashSet<ResultPoint>(5);
lastPossibleResultPoints = currentPossible;
paint.setAlpha(OPAQUE);
paint.setColor(resultPointColor);
for (ResultPoint point : currentPossible) {
canvas.drawCircle(frame.left + point.getX(), frame.top + point.getY(), 6.0f, paint);
}
}
if (currentLast != null) {
paint.setAlpha(OPAQUE / 2);
paint.setColor(resultPointColor);
for (ResultPoint point : currentLast) {
canvas.drawCircle(frame.left + point.getX(), frame.top + point.getY(), 3.0f, paint);
}
}
// Request another update at the animation interval, but only repaint the laser line,
// not the entire viewfinder mask.
postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top, frame.right, frame.bottom);
}
}
