在我的 Android 应用程序中,通过单击一个按钮,我打开了一个自定义 AlertDialog
,用户应该能够在其中扫描条形码,AlertDialog
中有一个SurfaceView
,其中我使用 BarcodeDetector
启动 CameraSource
。
问题是,用户并不清楚他应该在打开相机的那个窗口上做什么,所以我想知道是否可以添加一个跟踪器,在用户尝试扫描的条形码周围画一个框,或者像这样。
这是我在构建 AlertDialog 时调用的方法:
private void initialiseDetectorsAndSources(SurfaceView surfaceView) {
BarcodeDetector barcodeDetector = new BarcodeDetector.Builder(this)
.setBarcodeFormats(Barcode.ALL_FORMATS)
.build();
CameraSource cameraSource = new CameraSource.Builder(this, barcodeDetector)
.setRequestedPreviewSize(1600, 1024)
.setAutoFocusEnabled(true) //you should add this feature
.build();
surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
if (ActivityCompat.checkSelfPermission(pterm.this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
cameraSource.start(surfaceView.getHolder());
} else {
ActivityCompat.requestPermissions(pterm.this, new
String[]{Manifest.permission.CAMERA}, 201);
}
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
cameraSource.stop();
}
});
barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
@Override
public void release() {
// Toast.makeText(getApplicationContext(), "To prevent memory leaks barcode scanner has been stopped", Toast.LENGTH_SHORT).show();
}
@Override
public void receiveDetections(Detector.Detections<Barcode> detections) {
final SparseArray<Barcode> barcodes = detections.getDetectedItems();
if (barcodes.size() != 0) {
alertFidelityTxt.post(new Runnable() {
@Override
public void run() {
if (barcodes.valueAt(0).email != null) {
alertFidelityTxt.removeCallbacks(null);
codFidelity = barcodes.valueAt(0).email.address;
alertFidelityTxt.setText(codFidelity);
toneGen1.startTone(ToneGenerator.TONE_CDMA_PIP, 150);
fidelity.setText(codFidelity);
linearFidelity.setBackgroundColor(Color.parseColor("#00796B"));
alertFidelity.dismiss();
} else {
codFidelity = barcodes.valueAt(0).displayValue;
alertFidelityTxt.setText(codFidelity);
toneGen1.startTone(ToneGenerator.TONE_CDMA_PIP, 150);
fidelity.setText(codFidelity);
linearFidelity.setBackgroundColor(Color.parseColor("#00796B"));
alertFidelity.dismiss();
}
}
});
}
}
});
}
最佳答案
这可以通过第三方库实现。我正在提供一堆有用的代码。此库的简要说明在 GitHub. 上
在 gradle 文件中请实现下面给出的
//for qr code scanner
implementation 'me.dm7.barcodescanner:zxing:1.9.13'
SimpleScannerActivity.java
public class SimpleScannerActivity extends Activity implements ZXingScannerView.ResultHandler {
private ZXingScannerView mScannerView;
@Override
public void onCreate(Bundle state) {
super.onCreate(state);
mScannerView = new ZXingScannerView(this); // Programmatically initialize the scanner view
setContentView(mScannerView); // Set the scanner view as the content view
}
@Override
public void onResume() {
super.onResume();
mScannerView.setResultHandler(this); // Register ourselves as a handler for scan results.
mScannerView.startCamera(); // Start camera on resume
}
@Override
public void onPause() {
super.onPause();
mScannerView.stopCamera(); // Stop camera on pause
}
@Override
public void handleResult(Result rawResult) {
// Do something with the result here
Log.v(TAG, rawResult.getText()); // Prints scan results
Log.v(TAG, rawResult.getBarcodeFormat().toString()); // Prints the scan format (qrcode, pdf417 etc.)
// If you would like to resume scanning, call this method below:
mScannerView.resumeCameraPreview(this);
}
}
并且不要忘记将 CAMERA PERMISSION 放入您的 list 文件中
<uses-feature android:name="android.hardware.camera" android:required="true" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera.autofocus" />
关于android - 如何使用视觉将盒子添加到条码扫描仪?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/64677956/