android扫码功能实现

1.
 // 二维码扫描库
implementation('com.journeyapps:zxing-android-embedded:4.3.0') { transitive = false }
implementation 'com.google.zxing:core:3.3.0'

2.
<com.journeyapps.barcodescanner.DecoratedBarcodeView
        android:id="@+id/barcode_scanner"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintVertical_weight="1"
        app:zxing_scanner_layout="@layout/custom_barcode_scanner"
        app:layout_constraintTop_toTopOf="parent"
        />

3.
barcodeView = findViewById(R.id.barcode_scanner);
Collection<BarcodeFormat> formats = Arrays.asList(BarcodeFormat.QR_CODE, BarcodeFormat.CODE_39);
barcodeView.getBarcodeView().setDecoderFactory(new DefaultDecoderFactory(formats));
barcodeView.initializeFromIntent(getIntent());
CameraSettings cameraSettings = barcodeView.getCameraSettings();
cameraSettings.setRequestedCameraId(0);
barcodeView.setCameraSettings(cameraSettings);
barcodeView.decodeContinuous(callback);

4.
// 扫描结果回调
    private BarcodeCallback callback = new BarcodeCallback() {
        @Override
        public void barcodeResult(BarcodeResult result) {
            if(result.getText() == null || result.getText().equals(lastText)) {
                // Prevent duplicate scans
                return;
            }

            lastText = result.getText();
//            barcodeView.setStatusText(result.getText());
            Log.d(TAG, "scan content=" + result.getText());

            beepManager.playBeepSoundAndVibrate();
            //Added preview of scanned barcode
//            ImageView imageView = findViewById(R.id.barcodePreview);
//            imageView.setImageBitmap(result.getBitmapWithResultPoints(Color.YELLOW));
            handleScanResult(result);
        }

        @Override
        public void possibleResultPoints(List<ResultPoint> resultPoints) {
        }
    };

5.
  @Override
    protected void onResume() {
        super.onResume();
        barcodeView.resume();
    }

    @Override
    protected void onPause() {
        super.onPause();

        barcodeView.pause();
    }

    public void pause(View view) {
        barcodeView.pause();
    }

    public void resume(View view) {
        barcodeView.resume();
    }

    public void triggerScan(View view) {
        barcodeView.decodeSingle(callback);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        return barcodeView.onKeyDown(keyCode, event) || super.onKeyDown(keyCode, event);
    }