【发布时间】：2019-12-21 12:27:57
【问题描述】：
我正在尝试使用 ML Kit 在 android studio 中构建条形码扫描仪。我有一个工作正常的代码，它只检测二维码。我想让条形码扫描仪读取所有类型的条形码，主要是食品条形码。我正在尝试获取条形码的原始值，以便在数据库中进行搜索并将相关信息显示到屏幕上。
以下是我用来检测二维码的代码。
public class MainActivity extends AppCompatActivity {
CameraView camera_view;
boolean isDetected = false;
private Button btn_start_again;
FirebaseVisionBarcodeDetectorOptions options;
FirebaseVisionBarcodeDetector detector;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Dexter.withActivity(this)
.withPermissions(new String [] {Manifest.permission.CAMERA,Manifest.permission.RECORD_AUDIO})
.withListener(new MultiplePermissionsListener() {
@Override
public void onPermissionsChecked(MultiplePermissionsReport report) {
setUpCamera();
}
@Override
public void onPermissionRationaleShouldBeShown(List<PermissionRequest> permissions, PermissionToken token) {
Toast.makeText(getApplicationContext(),"You must accept the permissions",Toast.LENGTH_LONG).show();
}
}).check();
}
private void setUpCamera() {
btn_start_again =(Button)findViewById(R.id.btn_again);
btn_start_again.setEnabled(false);
btn_start_again.setOnClickListener((View v) -> isDetected = !isDetected);
camera_view = (CameraView) findViewById(R.id.cameraview);
camera_view.setLifecycleOwner(this);
camera_view.addFrameProcessor(new FrameProcessor() {
@Override
public void process(@NonNull Frame frame) {
processImage(getVisionImageFromFrame(frame));
}
});
FirebaseVisionBarcodeDetectorOptions options =
new FirebaseVisionBarcodeDetectorOptions.Builder()
.setBarcodeFormats(
FirebaseVisionBarcode.FORMAT_QR_CODE,
FirebaseVisionBarcode.FORMAT_AZTEC)
.build();
detector = FirebaseVision.getInstance().getVisionBarcodeDetector(options);
}
private void processImage(FirebaseVisionImage image) {
if(!isDetected){
detector.detectInImage(image)
.addOnSuccessListener(new OnSuccessListener<List<FirebaseVisionBarcode>>() {
@Override
public void onSuccess(List<FirebaseVisionBarcode> firebaseVisionBarcodes) {
processResult(firebaseVisionBarcodes);
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Toast.makeText(getApplicationContext(),"e.getMessage()",Toast.LENGTH_LONG).show();
}
});
}
}
private void processResult(List<FirebaseVisionBarcode> firebaseVisionBarcodes) {
if(firebaseVisionBarcodes.size() > 0 ){
isDetected = true;
btn_start_again.setEnabled(isDetected);
for (FirebaseVisionBarcode item:firebaseVisionBarcodes){
Rect bounds = item.getBoundingBox();
Point[] corners = item.getCornerPoints();
String rawValue = item.getRawValue();
int value_type = item.getValueType();
switch (value_type){
case FirebaseVisionBarcode.TYPE_TEXT:
{
createDialog(item.getRawValue());
}
break;
case FirebaseVisionBarcode.TYPE_URL:
{
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(item.getRawValue()));
startActivity(intent);
}
case FirebaseVisionBarcode.TYPE_CONTACT_INFO:
{
String info = new StringBuilder("Name:")
/*.append(item.getContactInfo().getName().getFormattedName())
.append("\n")*/
.append("Address")
.append(item.getContactInfo().getAddresses().get(0).getAddressLines())
.append("\n")
.append("Email:")
.append(item.getContactInfo().getEmails().get(0).getAddress())
.toString();
createDialog(info);
}
break;
default:
{
createDialog(rawValue);
}
break;
}
}
}
}
private void createDialog(String text) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(text);
builder.setPositiveButton("OK", ((DialogInterface dialog, int i) -> dialog.dismiss()));
AlertDialog dialog = builder.create();
dialog.show();
}
private FirebaseVisionImage getVisionImageFromFrame(Frame frame) {
byte[] data = frame.getData();
FirebaseVisionImageMetadata metadata = new FirebaseVisionImageMetadata.Builder()
.setFormat(FirebaseVisionImageMetadata.IMAGE_FORMAT_NV21)
.setHeight(frame.getSize().getHeight())
.setWidth(frame.getSize().getWidth())
.build();
//.setRotation(frame.getRotation())
return FirebaseVisionImage.fromByteArray(data,metadata);
}
}
【问题讨论】：
-
您的应用只读取二维码，因为您尚未添加条形码类型
-
.setBarcodeFormats( FirebaseVisionBarcode.FORMAT_QR_CODE, FirebaseVisionBarcode.FORMAT_AZTEC)在此处添加更多类型 -
我已经添加了几种格式和类型，仍然没有结果。
标签： java android barcode-scanner firebase-mlkit