如何在安卓手机上扫描二维码

Question

如何在安卓手机上扫描二维码

javaandroidqr-code

21

我在教程中找到了如何扫描条形码的方法。但是在我的应用程序中，我需要扫描QR码。如何在Android上扫描QR码？

- Sunil Kumar Sahoo

Zxing 也可以扫描 QR 码：请查看他们的主页这里。 - Rasman

有一个类似的问题：https://dev59.com/XnE95IYBdhLWcg3wCJXkZXing 在 QR 码上表现良好。 - Davidsun

感谢您的帮助。我错过了阅读Zxing文档的机会。 - Sunil Kumar Sahoo

1

你也可以使用NEO阅读器。 - Ishita Sinha

@IshitaSinha 我最近使用了zbar扫描器（http://zbar.sourceforge.net/）。它非常棒。 - Sunil Kumar Sahoo

请参考以下链接： https://dev59.com/eWQo5IYBdhLWcg3wZusc 我认为这会对你有所帮助。 - Sibaditya Maiti

8个回答

15

2016年更新

目前的推荐方案是使用Android条形码API，该API可以在设备上离线地实时检测到条形码，无需进行服务器往返：

条形码API可以任意方向上实时检测多个条形码。

它可以读取以下条形码格式：

一维条形码：EAN-13、EAN-8、UPC-A、UPC-E、Code-39、Code-93、Code-128、ITF、Codabar

二维条形码：QR Code、Data Matrix、PDF-417、AZTEC

对于以下支持的格式，它会自动解析QR码、Data Matrix、PDF-417和Aztec值：

URL

联系人信息（VCARD等）

日历事件

电子邮件

电话

短信

ISBN

WiFi

地理位置（纬度和经度）

AAMVA驾驶执照/ID

请查看本实验室 - 使用移动视觉API进行条形码检测。

- Dan Dascalescu

12

使用zxing可以轻松扫描QR码，在gradle中添加以下依赖即可：

compile 'com.journeyapps:zxing-android-embedded:3.1.0@aar'
compile 'com.google.zxing:core:3.2.0'

然后在您的Activity或Fragment中进行操作。

   IntentIntegrator scanIntegrator = new IntentIntegrator(context);
                scanIntegrator.setPrompt("Scan");
                scanIntegrator.setBeepEnabled(true);
                //The following line if you want QR code
                scanIntegrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE_TYPES);
                scanIntegrator.setCaptureActivity(CaptureActivityAnyOrientation.class);
                scanIntegrator.setOrientationLocked(true);
                scanIntegrator.setBarcodeImageEnabled(true);
                scanIntegrator.initiateScan();

然后在onActivityResult中捕获结果。

   @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        IntentResult scanningResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
        if (scanningResult != null) {
            if (scanningResult.getContents() != null) {
                scanContent = scanningResult.getContents().toString();
                scanFormat = scanningResult.getFormatName().toString();
            }

            Toast.makeText(this,scanContent+"   type:"+scanFormat,Toast.LENGTH_SHORT).show();

        }else{
            Toast.makeText(this,"Nothing scanned",Toast.LENGTH_SHORT).show();
        }
    }

看一下这个示例项目，希望它能对你有所帮助。

- Mithun Sarker Shuvro

什么是CaptureActivityAnyOrientation？ - roghayeh hosseini

7

一种方法是使用AppCompatActivity和ZXingScannerView.ResultHandler接口。

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.hardware.Camera;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraManager;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;;

import com.android.volley.VolleyError;
import com.example.team.merchant.functional.Request;
import com.example.team.merchant.functional.ResponseListener;
import com.google.zxing.Result;

import me.dm7.barcodescanner.zxing.ZXingScannerView;

/**
 * Created by Prakhar on 5/16/2016.
 */
public class MerchantScannerActivity extends AppCompatActivity implements ZXingScannerView.ResultHandler {
    private ZXingScannerView mScannerView;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        RelativeLayout relativeLayout = new RelativeLayout(this);

        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(60, 60);
        params.setMargins(0, 50, 50, 0);
        params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, RelativeLayout.TRUE);


        Button switchCamera = new Button(this); //declare a button in layout for camera change option
        switchCamera.setLayoutParams(params);
        switchCamera.setBackgroundResource(R.drawable.switch_camera);
        relativeLayout.addView(switchCamera);
        final int i = getFrontCameraId();
        if (i == -1) {
            switchCamera.setVisibility(View.GONE);
        }


        mScannerView = new ZXingScannerView(this);   // Programmatically initialize the scanner view
        relativeLayout.addView(mScannerView);

        setContentView(relativeLayout);
        final int[] id = {0};
        switchCamera.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mScannerView.stopCamera();
                if (id[0] % 2 == 0) {
                    mScannerView.startCamera(i);
                } else {
                    mScannerView.startCamera();
                }
                id[0]++;
            }
        });

        mScannerView.setResultHandler(this);// Register ourselves as a handler for scan results.

        mScannerView.startCamera();         // Start camera


    }

    @SuppressLint("NewApi")
    int getFrontCameraId() {
        if (Build.VERSION.SDK_INT < 22) {
            Camera.CameraInfo ci = new Camera.CameraInfo();
            for (int i = 0; i < Camera.getNumberOfCameras(); i++) {
                Camera.getCameraInfo(i, ci);
                if (ci.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) return i;
            }
        } else {
            try {
                CameraManager cManager = (CameraManager) getApplicationContext()
                        .getSystemService(Context.CAMERA_SERVICE);
                String[] cameraId = cManager.getCameraIdList();
                for (int j = 0; j < cameraId.length; j++) {
                    CameraCharacteristics characteristics = cManager.getCameraCharacteristics(cameraId[j]);
                    int cOrientation = characteristics.get(CameraCharacteristics.LENS_FACING);
                    if (cOrientation == CameraCharacteristics.LENS_FACING_FRONT)
                        return Integer.parseInt(cameraId[j]);
                }
            } catch (CameraAccessException e) {
                e.printStackTrace();
            }
        }
        return -1; // No front-facing camera found
    }

    @Override
    public void onPause() {
        super.onPause();
        mScannerView.stopCamera();           // Stop camera on pause
    }

    @Override
    public void handleResult(Result rawResult) {
       // rawResult.getText()
       // handle your result here
       // handle exceptions here
    }
}

相应地，可以在片段中使用Other。

import android.Manifest;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.google.zxing.ResultPoint;
import com.journeyapps.barcodescanner.BarcodeCallback;
import com.journeyapps.barcodescanner.BarcodeResult;
import com.journeyapps.barcodescanner.CompoundBarcodeView;


/**
 * Created by Prakhar on 3/8/2016.
 */
public class PayWithQrCodeScannerFragment extends Fragment {

    private static final int PERMISSION_REQUEST_CAMERA = 23;
    public static CompoundBarcodeView barcodeScannerView;
    public static BarcodeCallback callback;



    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.paywithqrcodescannerfragment, container, false);

        barcodeScannerView = (CompoundBarcodeView) view.findViewById(R.id.zxing_barcode_scanner);


        callback = new BarcodeCallback() {
            @Override
            public void barcodeResult(BarcodeResult result) {
                    // handle result and exceptions here
            }
        return view;
    }

    /**
     * Check if the device's camera has a Flashlight.
     *
     * @return true if there is Flashlight, otherwise false.
     */
    private boolean hasFlash() {
        return getActivity().getApplicationContext().getPackageManager()
                .hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
    }


    @Override
    public void onResume() {
        super.onResume();
        if (android.os.Build.VERSION.SDK_INT < 23) {
            barcodeScannerView.resume();
        }
    }


    @Override
    public void onPause() {
        super.onPause();
        if (android.os.Build.VERSION.SDK_INT < 23) {
            barcodeScannerView.pause();
        }
    }

}

使用以下代码在布局XML文件中占位扫描仪

<com.journeyapps.barcodescanner.CompoundBarcodeView
            android:id="@+id/zxing_barcode_scanner"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:zxing_preview_scaling_strategy="centerCrop"
            app:zxing_use_texture_view="false" />

Build.gradle

compile 'com.journeyapps:zxing-android-embedded:3.2.0@aar'
compile 'com.google.zxing:core:3.2.1'

- Prakhar Kulshreshtha

3

我的做法是使用 barcodescanner。我使用 zxing 来扫描条形码和二维码。这个库的版本 1.9 使用了 zxing v3.2.1。它是 zxing 的一个包装器，因此使用起来更加简单。

要实现这一点，您需要：

Add dependency to gradle

compile 'me.dm7.barcodescanner:zxing:1.9'

Add camera permission to manifest

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

Create activity, that will handle scanning

Manifest:

<activity
    android:name=".view.component.ScannerActivity"
    android:label="@string/app_name"
    android:screenOrientation="portrait"
    android:theme="@style/AppThemeTransparent"/>

styles.xml:

<style name="AppThemeTransparent" parent="@style/Theme.AppCompat.Light">
    <item name="windowNoTitle">true</item>
    <item name="windowActionBar">false</item>
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="android:windowFullscreen">true</item>
    <item name="android:windowContentOverlay">@null</item>
</style>

Create scanner activity:

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.WindowManager;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import me.dm7.barcodescanner.zxing.ZXingScannerView;

public class ScannerActivity extends Activity implements ZXingScannerView.ResultHandler {

    public static final String EXCLUDED_FORMAT = "ExcludedFormat";
    private static final String TAG = ScannerActivity.class.getSimpleName();
    private ZXingScannerView mScannerView;

    @Override
    public void onCreate(Bundle state) {
        setStatusBarTranslucent(true);
        super.onCreate(state);
        mScannerView = new ZXingScannerView(this);
        setContentView(mScannerView);
    }

    protected void setStatusBarTranslucent(boolean makeTranslucent) {
        if (makeTranslucent) {
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        } else {
            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }
    }

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

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

    @Override
    public void handleResult(Result rawResult) {
        String result = rawResult.getText();
        BarcodeFormat format = rawResult.getBarcodeFormat();

        Log.v(TAG, "Scanned code: " + rawResult.getText());
        Log.v(TAG, "Scanend code type: " + rawResult.getBarcodeFormat().toString());

        //Return error
        if (result == null) {
            setResult(RESULT_CANCELED, returnErrorCode(result, format));
            finish();
        }

        if (result.isEmpty()) {
            setResult(RESULT_CANCELED, returnErrorCode(result, format));
            finish();
        }

        //Return correct code
        setResult(RESULT_OK, returnCorrectCode(result, format));
        finish();
    }

    private Intent returnErrorCode(String result, BarcodeFormat format) {
        Intent returnIntent = new Intent();
        returnIntent.putExtra(ScannerConstants.ERROR_INFO, getResources().getString(R.string.scanner_error_message));
        return returnIntent;
    }

    private Intent returnCorrectCode(String result, BarcodeFormat format) {
        Intent returnIntent = new Intent();
        returnIntent.putExtra(ScannerConstants.SCAN_RESULT, result);

        if (format.equals(BarcodeFormat.QR_CODE)) {
            returnIntent.putExtra(ScannerConstants.SCAN_RESULT_TYPE, ScannerConstants.QR_SCAN);
        } else {
            returnIntent.putExtra(ScannerConstants.SCAN_RESULT_TYPE, ScannerConstants.BAR_SCAN);
        }

        return returnIntent;
    }

    public void excludeFormats(BarcodeFormat item) {
        Collection<BarcodeFormat> defaultFormats = mScannerView.getFormats();
        List<BarcodeFormat> formats = new ArrayList<>();
        for (BarcodeFormat format : defaultFormats) {
            if (!format.equals(item)) {
                formats.add(format);
            }
        }
        mScannerView.setFormats(formats);
    }

    public interface ScannerConstants {
        public static final String SCAN_MODES = "SCAN_MODES";
        public static final String SCAN_RESULT = "SCAN_RESULT";
        public static final String SCAN_RESULT_TYPE = "SCAN_RESULT_TYPE";
        public static final String ERROR_INFO = "ERROR_INFO";
        public static final int BAR_SCAN = 0;
        public static final int QR_SCAN = 1;
    }
}

Just be sure, that on API 23+ devices a permission for camera usage is granted for the application.

Open the Activity just like the normal one with result expectation:

Intent intent = new Intent(AddEquipmentActivity.this, ScannerActivity.class);
startActivityForResult(intent, SCAN_SERIAL_REQUEST);

- R. Zagórski

2

这里是扫描二维码的函数。

public void scanQR(View v)
{
    try
    {
        Intent intent = new Intent(ACTION_SCAN);
        intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
        startActivityForResult(intent, 0);
    }
    catch (ActivityNotFoundException anfe)
    {
        showDialog(ActivityUserDetails.this, "No Scanner Found",
                "Download a scanner code activity?", "Yes", "No").show();
    }
}

在上面的代码片段中，我从catch块中调用了showDialog()方法，这将显示一个AlertDialog，询问是否要从Google Play安装“条形码扫描仪”应用程序。以下是showDialog方法的代码。

private static AlertDialog showDialog(final Activity act,
                                      CharSequence title, CharSequence message, CharSequence buttonYes,
                                      CharSequence buttonNo)
{
    AlertDialog.Builder downloadDialog = new AlertDialog.Builder(act);
    downloadDialog.setTitle(title);
    downloadDialog.setMessage(message);
    downloadDialog.setPositiveButton(buttonYes,
            new DialogInterface.OnClickListener()
            {
                public void onClick(DialogInterface dialogInterface, int i)
                {
                    Uri uri = Uri.parse("market://search?q=pname:"
                            + "com.google.zxing.client.android");
                    Intent intent = new Intent(Intent.ACTION_VIEW, uri);
                    try
                    {
                        act.startActivity(intent);
                    }
                    catch (ActivityNotFoundException anfe)
                    {

                    }
                }
            });
            downloadDialog.setNegativeButton(buttonNo,
            new DialogInterface.OnClickListener()
            {
                public void onClick(DialogInterface dialogInterface, int i)
                {
                }
            });
            return downloadDialog.show();
}

我在Button点击事件上使用了这个函数。因此，Button的代码如下（xml文件）。

                    <Button
                    android:id="@+id/button_wr_scan"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_margin="5dp"
                    android:background="@drawable/button_shadow"
                    android:onClick="scanQR"
                    android:paddingRight="4dp"
                    android:paddingTop="4dp"
                    android:text="ScanQR" />

注意：使用此功能的前提是你必须在设备中预先安装了“条形码扫描器”应用程序。

希望能对你有所帮助。

谢谢:)

- Swanand

1

逐步设置Eclipse中的zxing 3.2.1

从 "https://github.com/zxing/zxing" 下载 zxing-master.zip
解压 zxing-master.zip，使用 Eclipse 导入 zxing-master 中的 "android" 项目
从 "http://repo1.maven.org/maven2/com/google/zxing/core/3.2.1/" 下载 core-3.2.1.jar
在 "android" 项目中创建 "libs" 文件夹，并将 cor-3.2.1.jar 粘贴到 libs 文件夹中
点击项目：选择 "属性" -> "Java 编译器" 将级别更改为 1.7。然后单击 "Android" 更改 "项目构建目标" 为 Android 4.4.2+，因为使用 1.7 需要与 Android 4.4 编译
如果 "zxing-master/android/app/src/main/java/com/google/zxing/client/android/camera/" 中不存在 "CameraConfigurationUtils.java"。您可以从 "zxing-master/android-core/src/main/java/com/google/zxing/client/android/camera/" 复制它并粘贴到您的项目中。
清理和构建项目。如果您的项目显示关于 "switch-case" 的错误，则应将它们更改为 "if-else"。
完成。清理和构建项目参考链接：如何在 Android 中使用 Zxing

- Anh Duy

0

Gradle模块

dependencies {
    implementation 'com.journeyapps:zxing-android-embedded:4.1.0'
}

activity.kt

package com.example.qrcode

import android.content.Intent
import android.os.Bundle
import android.widget.Button
import android.widget.ImageButton
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.app.AppCompatDelegate
import com.google.android.material.internal.ContextUtils.getActivity
import com.google.zxing.integration.android.IntentIntegrator
import com.google.zxing.integration.android.IntentResult

class LicenseCheck : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)
        setContentView(R.layout.licensecheck)
        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);

        fun checklicense(license: String){
            Toast.makeText(this, license, Toast.LENGTH_SHORT).show()
        }
        val scanbtn = findViewById(R.id.qrscanner) as ImageButton
        scanbtn.setOnClickListener {
            val integrator = IntentIntegrator(this)
            integrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE)
            integrator.setPrompt("Focus QRCode from App...")
            integrator.setCameraId(0)
            integrator.setBeepEnabled(true)
            integrator.setBarcodeImageEnabled(false)
            integrator.initiateScan()
        }
        @Override
        fun onActivityResult(requestCode:Int, resultCode:Int, data: Intent) {
            var result: IntentResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
            if (result.getContents() == null) {
                Toast.makeText(this, "Scanning failed!", Toast.LENGTH_LONG).show();
            } else {
                checklicense(result.getContents());
            }
        }
    }
}

- Wasim A.

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Seshu Vinay · Accepted Answer

try {
    Intent intent = new Intent("com.google.zxing.client.android.SCAN");
    intent.putExtra("SCAN_MODE", "QR_CODE_MODE"); // "PRODUCT_MODE for bar codes

    startActivityForResult(intent, 0);
} catch (Exception e) {    
    Uri marketUri = Uri.parse("market://details?id=com.google.zxing.client.android");
    Intent marketIntent = new Intent(Intent.ACTION_VIEW,marketUri);
    startActivity(marketIntent);
}

并且在 onActivityResult(): 中：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == 0) {
        if (resultCode == RESULT_OK) {
            String contents = data.getStringExtra("SCAN_RESULT");
        }
        if(resultCode == RESULT_CANCELLED){
            //handle cancel
        }
    }
}