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" />