Android -无法使用zxing库检测二维码

implementation 'com.google.zxing:core:3.3.3'
implementation 'com.journeyapps:zxing-android-embedded:3.6.0'

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

IntentIntegrator integrator = new IntentIntegrator(this);
integrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE);
integrator.setPrompt("Scan a QR Code");
integrator.setCameraId(0);  // 使用后置摄像头
integrator.setBeepEnabled(false);  // 关闭扫描成功的声音
integrator.setBarcodeImageEnabled(true);  // 保存扫描的二维码图片
integrator.initiateScan();