android 扫描二维码_fdroid

1.在你的build.gradle文件中添加Mobile Vision库的依赖：

dependencies {
    implementation 'com.google.android.gms:play-services-vision:20.1.0'
}

2.创建一个新的Activity来处理扫描过程。

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.appcompat.app.AppCompatActivity;
import com.google.android.gms.vision.barcode.BarcodeReader;
import com.google.android.gms.vision.CameraSource;
import com.google.android.gms.vision.barcode.Barcode;
import android.util.SparseArray;
import com.google.android.gms.vision.Detector;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
 
public class QRCodeScannerActivity extends AppCompatActivity {
 
    private SurfaceView cameraPreview;
    private CameraSource cameraSource;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_qrcode_scanner);
 
        cameraPreview = findViewById(R.id.camera_preview);
 
        BarcodeReader barcodeReader = new BarcodeReader.Builder(this).build();
        cameraSource = new CameraSource.Builder(this, barcodeReader)
                .setFacing(CameraSource.CAMERA_FACING_BACK)
                .setRequestedPreviewSize(1600, 1024)
                .setAutoFocusEnabled(true)
                .build();
        cameraPreview.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                if (ContextCompat.checkSelfPermission(QRCodeScannerActivity.this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
                    try {
                        cameraSource.start(cameraPreview.getHolder());
                    } 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();
            }
        });
 
        barcodeReader.setProcessor(new Detector.Processor<Barcode>() {
            @Override
            public void release() {
            }
 
            @Override
            public void receiveDetections(Detector.Detections<Barcode> detections) {
                final SparseArray<Barcode> qrCodes = detections.getDetectedItems();
                if (qrCodes.size() != 0) {
                    Barcode barcode = qrCodes.valueAt(0);
                    String scannedQRCode = barcode.displayValue;
                    // Handle the scanned code as needed
                }
            }
        });
    }
 
    @Override
    protected void onDestroy() {
        super.onDestroy();
        cameraSource.release();
    }
}

3.确保你的AndroidManifest.xml文件中添加了相应的权限

<uses-permission android:name="android.permission.CAMERA" />