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Decode QR code in a background thread
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@saguinav
saguinav committed Jul 25, 2016
1 parent 5640e14 commit 590265f
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Showing 3 changed files with 184 additions and 150 deletions.
291 changes: 161 additions & 130 deletions qrcodereaderview/src/main/java/com/dlazaro66/qrcodereaderview/QRCodeReaderView.java
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@
import android.content.pm.PackageManager;
import android.graphics.PointF;
import android.hardware.Camera;
import android.os.AsyncTask;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Surface;
Expand All @@ -36,6 +37,7 @@
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeReader;
import java.io.IOException;
import java.lang.ref.WeakReference;

/**
* QRCodeReaderView - Class which uses ZXING lib and let you easily integrate a QR decoder view.
Expand All @@ -48,11 +50,7 @@ public class QRCodeReaderView extends SurfaceView

public interface OnQRCodeReadListener {

public void onQRCodeRead(String text, PointF[] points);

public void cameraNotFound();

public void QRCodeNotFoundOnCamImage();
void onQRCodeRead(String text, PointF[] points);
}

private OnQRCodeReadListener mOnQRCodeReadListener;
Expand All @@ -62,40 +60,44 @@ public interface OnQRCodeReadListener {
private QRCodeReader mQRCodeReader;
private int mPreviewWidth;
private int mPreviewHeight;
private SurfaceHolder mHolder;
private CameraManager mCameraManager;
private DecodeFrameTask decodeFrameTask;

public QRCodeReaderView(Context context) {
super(context);
init();
this(context, null);
}

public QRCodeReaderView(Context context, AttributeSet attrs) {
super(context, attrs);
init();

if (checkCameraHardware()) {
mCameraManager = new CameraManager(getContext());
mCameraManager.setPreviewCallback(this);

getHolder().addCallback(this);
} else {
throw new RuntimeException("Error: Camera not found");
}
}

public void setOnQRCodeReadListener(OnQRCodeReadListener onQRCodeReadListener) {
mOnQRCodeReadListener = onQRCodeReadListener;
}

public CameraManager getCameraManager() {
return mCameraManager;
public void startCamera() {
mCameraManager.startPreview();
}

@SuppressWarnings("deprecation") private void init() {
if (checkCameraHardware(getContext())) {
mCameraManager = new CameraManager(getContext());
public void stopCamera() {
mCameraManager.stopPreview();
}

mHolder = this.getHolder();
mHolder.addCallback(this);
mHolder.setType(
SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); // Need to set this flag despite it's deprecated
} else {
Log.e(TAG, "Error: Camera not found");
if (mOnQRCodeReadListener != null) {
mOnQRCodeReadListener.cameraNotFound();
}
@Override public void onDetachedFromWindow() {
super.onDetachedFromWindow();

if (decodeFrameTask != null) {
decodeFrameTask.cancel(true);
decodeFrameTask = null;
}
}

Expand All @@ -121,110 +123,58 @@ public CameraManager getCameraManager() {
}
}

@Override public void surfaceDestroyed(SurfaceHolder holder) {
Log.d(TAG, "surfaceDestroyed");
mCameraManager.getCamera().setPreviewCallback(null);
mCameraManager.getCamera().stopPreview();
mCameraManager.getCamera().release();
mCameraManager.closeDriver();
}

// Called when camera take a frame
@Override public void onPreviewFrame(byte[] data, Camera camera) {

PlanarYUVLuminanceSource source =
mCameraManager.buildLuminanceSource(data, mPreviewWidth, mPreviewHeight);

HybridBinarizer hybBin = new HybridBinarizer(source);
BinaryBitmap bitmap = new BinaryBitmap(hybBin);

try {
Result result = mQRCodeReader.decode(bitmap);

// Notify we found a QRCode
if (mOnQRCodeReadListener != null) {
// Transform resultPoints to View coordinates
PointF[] transformedPoints = transformToViewCoordinates(result.getResultPoints());
mOnQRCodeReadListener.onQRCodeRead(result.getText(), transformedPoints);
}
} catch (ChecksumException e) {
Log.d(TAG, "ChecksumException");
e.printStackTrace();
} catch (NotFoundException e) {
// Notify QR not found
if (mOnQRCodeReadListener != null) {
mOnQRCodeReadListener.QRCodeNotFoundOnCamImage();
}
} catch (FormatException e) {
Log.d(TAG, "FormatException");
e.printStackTrace();
} finally {
mQRCodeReader.reset();
}
}

@Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
Log.d(TAG, "surfaceChanged");

if (mHolder.getSurface() == null) {
if (holder.getSurface() == null) {
Log.e(TAG, "Error: preview surface does not exist");
return;
}

//preview_width = width;
//preview_height = height;
if (mCameraManager.getPreviewSize() == null) {
Log.e(TAG, "Error: preview size does not exist");
return;
}

mPreviewWidth = mCameraManager.getPreviewSize().x;
mPreviewHeight = mCameraManager.getPreviewSize().y;

mCameraManager.stopPreview();
mCameraManager.getCamera().setPreviewCallback(this);
mCameraManager.getCamera().setDisplayOrientation(90); // Portrait mode

// Fix the camera sensor rotation
setCameraDisplayOrientation(this.getContext(), mCameraManager.getCamera());
mCameraManager.setDisplayOrientation(getCameraDisplayOrientation());

mCameraManager.startPreview();
}

/**
* Transform result to surfaceView coordinates
*
* This method is needed because coordinates are given in landscape camera coordinates.
* Now is working but transform operations aren't very explained
*
* TODO re-write this method explaining each single value
*
* @return a new PointF array with transformed points
*/
private PointF[] transformToViewCoordinates(ResultPoint[] resultPoints) {

PointF[] transformedPoints = new PointF[resultPoints.length];
int index = 0;
if (resultPoints != null) {
float previewX = mCameraManager.getPreviewSize().x;
float previewY = mCameraManager.getPreviewSize().y;
float scaleX = this.getWidth() / previewY;
float scaleY = this.getHeight() / previewX;
@Override public void surfaceDestroyed(SurfaceHolder holder) {
Log.d(TAG, "surfaceDestroyed");
mCameraManager.setPreviewCallback(null);
mCameraManager.stopPreview();
mCameraManager.closeDriver();
}

for (ResultPoint point : resultPoints) {
PointF tmppoint = new PointF((previewY - point.getY()) * scaleX, point.getX() * scaleY);
transformedPoints[index] = tmppoint;
index++;
}
// Called when camera take a frame
@Override public void onPreviewFrame(byte[] data, Camera camera) {
if (decodeFrameTask != null && decodeFrameTask.getStatus() == AsyncTask.Status.RUNNING) {
return;
}
return transformedPoints;

decodeFrameTask = new DecodeFrameTask(this);
decodeFrameTask.execute(data);
}

/** Check if this device has a camera */
private boolean checkCameraHardware(Context context) {
if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
private boolean checkCameraHardware() {
if (getContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
// this device has a camera
return true;
} else if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FRONT)) {
} else if (getContext().getPackageManager()
.hasSystemFeature(PackageManager.FEATURE_CAMERA_FRONT)) {
// this device has a front camera
return true;
} else if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_ANY)) {
} else if (getContext().getPackageManager()
.hasSystemFeature(PackageManager.FEATURE_CAMERA_ANY)) {
// this device has any camera
return true;
} else {
Expand All @@ -234,41 +184,122 @@ private boolean checkCameraHardware(Context context) {
}

/**
* Fix for the camera Sensor no some devices (ex.: Nexus 5x)
* Fix for the camera Sensor on some devices (ex.: Nexus 5x)
* http://developer.android.com/intl/pt-br/reference/android/hardware/Camera.html#setDisplayOrientation(int)
*/
@SuppressWarnings("deprecation") public static void setCameraDisplayOrientation(Context context,
android.hardware.Camera camera) {
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.GINGERBREAD) {
Camera.CameraInfo info = new Camera.CameraInfo();
android.hardware.Camera.getCameraInfo(0, info);
WindowManager windowManager =
(WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
int rotation = windowManager.getDefaultDisplay().getRotation();
int degrees = 0;
switch (rotation) {
case Surface.ROTATION_0:
degrees = 0;
break;
case Surface.ROTATION_90:
degrees = 90;
break;
case Surface.ROTATION_180:
degrees = 180;
break;
case Surface.ROTATION_270:
degrees = 270;
break;
@SuppressWarnings("deprecation") private int getCameraDisplayOrientation() {
if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.GINGERBREAD) {
return 90;
}

Camera.CameraInfo info = new Camera.CameraInfo();
android.hardware.Camera.getCameraInfo(0, info);
WindowManager windowManager =
(WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
int rotation = windowManager.getDefaultDisplay().getRotation();
int degrees = 0;
switch (rotation) {
case Surface.ROTATION_0:
degrees = 0;
break;
case Surface.ROTATION_90:
degrees = 90;
break;
case Surface.ROTATION_180:
degrees = 180;
break;
case Surface.ROTATION_270:
degrees = 270;
break;
}

int result;
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
result = (info.orientation + degrees) % 360;
result = (360 - result) % 360; // compensate the mirror
} else { // back-facing
result = (info.orientation - degrees + 360) % 360;
}
return result;
}

private static class DecodeFrameTask extends AsyncTask<byte[], Void, Result> {

private final WeakReference<QRCodeReaderView> viewRef;

public DecodeFrameTask(QRCodeReaderView view) {
viewRef = new WeakReference<>(view);
}

@Override protected Result doInBackground(byte[]... params) {
final QRCodeReaderView view = viewRef.get();
if (view == null) {
return null;
}

int result;
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
result = (info.orientation + degrees) % 360;
result = (360 - result) % 360; // compensate the mirror
} else { // back-facing
result = (info.orientation - degrees + 360) % 360;
final PlanarYUVLuminanceSource source =
view.mCameraManager.buildLuminanceSource(params[0], view.mPreviewWidth,
view.mPreviewHeight);

final HybridBinarizer hybBin = new HybridBinarizer(source);
final BinaryBitmap bitmap = new BinaryBitmap(hybBin);

try {
return view.mQRCodeReader.decode(bitmap);
} catch (ChecksumException e) {
Log.e(TAG, "ChecksumException", e);
} catch (NotFoundException e) {
Log.d(TAG, "No QR Code found");
} catch (FormatException e) {
Log.e(TAG, "FormatException", e);
} finally {
view.mQRCodeReader.reset();
}
camera.setDisplayOrientation(result);

return null;
}

@Override protected void onPostExecute(Result result) {
super.onPostExecute(result);

final QRCodeReaderView view = viewRef.get();

// Notify we found a QRCode
if (view != null && result != null && view.mOnQRCodeReadListener != null) {
// Transform resultPoints to View coordinates
final PointF[] transformedPoints =
transformToViewCoordinates(view, result.getResultPoints());
view.mOnQRCodeReadListener.onQRCodeRead(result.getText(), transformedPoints);
}
}

/**
* Transform result to surfaceView coordinates
*
* This method is needed because coordinates are given in landscape camera coordinates.
* Now is working but transform operations aren't very explained
*
* TODO re-write this method explaining each single value
*
* @return a new PointF array with transformed points
*/
private static PointF[] transformToViewCoordinates(QRCodeReaderView view,
ResultPoint[] resultPoints) {
PointF[] transformedPoints = new PointF[resultPoints.length];

int index = 0;
float previewX = view.mCameraManager.getPreviewSize().x;
float previewY = view.mCameraManager.getPreviewSize().y;
float scaleX = view.getWidth() / previewY;
float scaleY = view.getHeight() / previewX;

for (ResultPoint point : resultPoints) {
PointF tmpPoint = new PointF((previewY - point.getY()) * scaleX, point.getX() * scaleY);
transformedPoints[index] = tmpPoint;
index++;
}

return transformedPoints;
}
}
}
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