如何在android中扫描QRCode

时间：2012-01-12 05:43:09

标签： java android qr-code

我找到了关于如何扫描条形码的a tutorial。但在我的应用程序中，我必须扫描QR码。如何在Android中扫描QR码？

7 个答案:

答案 0 :(得分：14)

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);
}

并在onActivityResult(): 

@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
        }
    }
}

答案 1 :(得分：11)

2016年更新

目前的建议是使用Android Barcode API，locally（离线），without需要服务器往返：

  

条形码API可以在设备上以任何方向实时检测条形码。它还可以同时检测多个条形码。

     

它读取以下条形码格式：

     
      
  • 1D条码：EAN-13，EAN-8，UPC-A，UPC-E，Code-39，Code-93，Code-128，ITF，Codabar
    •   
  • 二维条码：二维码，数据矩阵，PDF-417，AZTEC
    •   
     

它会自动解析QR码，数据矩阵，PDF-417和Aztec值，以支持以下格式：

     
      
  • URL
    •   
  • 联系信息（VCARD等）
    •   
  • 日历活动
    •   
  • 电子邮件
    •   
  • 电话
    •   
  • SMS
    •   
  • ISBN
    •   
  • 无线网络
    •   
  • 地理位置（经度和纬度）
    •   
  • AAMVA驾驶执照/ ID
    •   

查看codelab。

答案 2 :(得分：8)

您可以使用zxing轻松扫描QR码，并在您的游戏中添加以下依赖项

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

然后在Activity或Fragment

上 
   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();
        }
    }

看看这个sample project，希望它可以帮到你。

答案 3 :(得分：4)

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
    }
}

其他可以相应地用于碎片。

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();
        }
    }

}

使用下面的布局XML文件写入占位符扫描程序

<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" />

的build.gradle 

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

答案 4 :(得分：2)

我的方法是使用barcodescanner。我使用zxing来扫描条形码和QR码。该库的1.9版本使用zxing v3.2.1。它是zxing的包装器，因此用法更简单。

为了做到这一点：

  1. 向gradle添加依赖

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

  2. 为清单添加相机权限

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

  3. 创建将处理扫描的活动

    <强>清单： 

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

    <强> 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>

    创建扫描程序活动： 

    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;
    }
}

    请确保，在API 23+设备上，为应用程序授予了相机使用权限。

    打开Activity，就像正常的结果期望一样：

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

答案 5 :(得分：2)

以下是扫描QR码的function。

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();
    }
}

在上面的代码段中，我调用了来自showDialog()块的catch方法，该方法将显示AlertDialog，要求安装＆＃34;条码扫描器＆＃34;来自Google Play的应用。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点击事件中使用过此功能。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：使用此功能的先决条件是您必须预先安装＆＃34;条码扫描器＆＃34;您设备中的应用。

希望它有所帮助。

谢谢：）

答案 6 :(得分：1)

在eclipse中逐步设置zxing 3.2.1

  1. 从＆＃34; https://github.com/zxing/zxing＆＃34;
    2. 下载zxing-master.zip
  2. 解压缩zxing-master.zip，使用eclipse导入＆＃34; android＆＃34; zxing-master项目
  3. 从＆＃34; http://repo1.maven.org/maven2/com/google/zxing/core/3.2.1/＆＃34;
    4. 下载core-3.2.1.jar
  4. 创建＆＃34; libs＆＃34; ＆＃34; android＆＃34;中的文件夹将cor-3.2.1.jar项目并粘贴到libs文件夹中
  5. 点击项目：选择＆＃34;属性＆＃34; - ＆GT; ＆＃34; Java编译器＆＃34;将级别更改为1.7。然后点击＆＃34; Android＆＃34;改变＆＃34;项目构建目标＆＃34;到android 4.4.2+，因为使用1.7需要使用Android 4.4进行编译
  6. 如果＆＃34; CameraConfigurationUtils.java＆＃34;不存在于＆＃34; zxing-master / android / app / src / main / java / com / google / zxing / client / android / camera /＆＃34;。您可以从＆＃34; zxing-master / android-core / src / main / java / com / google / zxing / client / android / camera /＆＃34;复制它。并粘贴到您的项目中。
  7. 清理并构建项目。如果您的项目显示有关＆＃34; switch - case＆＃34;的错误，则应将其更改为＆＃34; if - else＆＃34;。
  8. 已完成。清理并构建项目 参考链接：How to use Zxing in android
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