Question

我试图在片段中获取QR扫描器，因此在扫描时会显示一个框，以便用户访问或取消链接。到目前为止，页面已加载，但其空白白色未显示任何QR阅读器/扫描器

我尝试了ZXingScannerView和多个更改以及不同的网站，但都没有成功，但是我一直想念一些东西，我在android中很安静，所以我不太确定。

public class QRScannerFragment extends Fragment implements ZXingScannerView.ResultHandler {
    private ZXingScannerView mScannerView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_qr_scanner, container, false);
        mScannerView = new ZXingScannerView(getActivity());
        mScannerView.setResultHandler(QRScannerFragment.this); // Register ourselves as a
        mScannerView.startCamera();
        return mScannerView;

    }

    @Override
    public void onResume() {
        super.onResume();
        mScannerView.setResultHandler(this);
        mScannerView.startCamera();
    }

    @Override
    public void handleResult(Result rawResult) {
        Toast.makeText(getActivity(), "Contents = " + rawResult.getText() +
                ", Format = " + rawResult.getBarcodeFormat().toString(), Toast.LENGTH_SHORT).show();
        // Note:
        // * Wait 2 seconds to resume the preview.
        // * On older devices continuously stopping and resuming camera preview can result in freezing the app.
        // * I don't know why this is the case but I don't have the time to figure out.
        Handler handler = new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                mScannerView.resumeCameraPreview(QRScannerFragment.this);
            }
        }, 2000);
    }

    @Override
    public void onPause() {
        super.onPause();
        mScannerView.stopCamera();
    }
}

XML文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">



</LinearLayout>

Answer 1

对于您的扫描仪片段来说有点晚了

 @Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    if (LOG_DEBUG) Log.w(TAG, "onCreateView: ");
    initScannerView();
    return mScannerView;
}

@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    Log.e(TAG, "onViewCreated: ");

    mScannerView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.w(TAG, "onClick: DO NOTHING");
        }
    });
    mScannerView.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
            Log.w(TAG, "onLongCLick: DO NOTHING");
            return true;
        }
    });

}

@Override
public void handleResult(Result rawResult) {
    Log.d(TAG, "handleResult: ");
    handleScanResult(rawResult);
}

@Override
public void onStart() {
    super.onStart();
    initScannerView();
}

@Override
public void onResume() {
    super.onResume();
    Log.e(TAG, "onResume: ");
    if (mScannerView != null) {
        mScannerView.setResultHandler(this);
        mScannerView.startCamera();
    }
}

@Override
public void onStop() {
    super.onStop();
    if (mScannerView != null) {
        mScannerView.setResultHandler(null);
        mScannerView.stopCamera();
    }
}



private void initScannerView() {
    if (mScannerView == null) {
        mScannerView = new ZXingScannerView(this.getContext());
    }
}

private void handleScanResult(Result rawResult) {
    if (rawResult != null) {
        mScanStringResult = rawResult.toString();
        Log.d(TAG, "handleResult - string result : " + mScanStringResult);
        Log.d(TAG, "handleResult - CODE FORMAT : " + rawResult.getBarcodeFormat().toString());
    }
}

您需要授予相机权限，在执行Scan片段的事务之前，请使用initRequest（）方法。

   @Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                       @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (LOG_DEBUG) Log.e(TAG, " onRequestPermissionsResult");

    if (requestCode == CommonConstants.PERMISSION_CODE_REQUEST_ACCESS_CAMERA) {
        if (shouldShowRequestPermissionRationale(Manifest.permission.CAMERA)) {
            // rationale
            if (LOG_DEBUG) Log.w(TAG, "denied nope");
            dialogRational();
        } else {
            if (checkSelfPermission()) {
                //allowed
                if (LOG_DEBUG) Log.v(TAG, "onGranted: Permission");

                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {

                        if (getFragmentManager() != null) {


                            //GO to your scan fragment
                        }
                    }
                }, 200);

            } else {
                //set to never ask again
                if (LOG_DEBUG) Log.w(TAG, "set to never ask again never");

                //TODO DIALOG TO GO TO SETTINGS
                UtilDialog.settingDialog(mInflatedView.getContext());
            }
        }
    }
}

private void dialogRational() {
    if (LOG_DEBUG) Log.d(TAG, "dialogRational: ");
    new AlertDialog.Builder(mInflatedView.getContext())
            .setCancelable(false).setTitle("Warning")
            .setMessage("You must grant the permission, " +
                    "if denied, then go to Setting to activate manually ")
            .setPositiveButton("GRANT ", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    dialogInterface.dismiss();
                    requestPermission();
                }
            })
            .setNeutralButton("DISMISS", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    dialogInterface.dismiss();
                }
            }).show();
}

//init
public void initPermission() {
    if (LOG_DEBUG) Log.d(TAG, "initPermission: ");
    requestPermission();

}

//request
private void requestPermission() {
    if (LOG_DEBUG) Log.d(TAG, " requestPermission");
    requestPermissions(new String[]{Manifest.permission.CAMERA}
            , CommonConstants.PERMISSION_CODE_REQUEST_ACCESS_CAMERA);
}

// this one : never ask again
private boolean checkSelfPermission() {
    if (LOG_DEBUG) Log.d(TAG, " checkSelfPermission");
    return ContextCompat.checkSelfPermission(mInflatedView.getContext(), Manifest.permission.CAMERA)
            == PackageManager.PERMISSION_GRANTED;

}

并在清单

中使用它们

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

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />

片段中的ZXingScanner的实现以使用QR扫描仪

1 个答案: