如何在Android上使用相机读取条形码？

Question

我希望我的应用程序识别相机拍摄的条形码.可以使用Android SDK吗？

像这样: 条形码扫描仪

Answer 1

它没有内置到SDK中,但您可以使用Zxing库.它是免费的,开源的和Apache许可的.

2016年的建议是使用条形码API,它也可以脱机工作.

Answer 2

2016年更新

借助最新版本的Google Play Services v7.8,您可以访问新的Mobile Vision API.这可能是现在实现条形码扫描最方便的方式,也可以离线工作.

来自Android Barcode API:

条形码API可以在设备上以任何方向实时检测条形码.它还可以一次检测多个条形码.

它读取以下条形码格式:

• 1D条形码: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:

• 网址
• 联系信息(VCARD等)
• 日历活动
• 电子邮件
• 电话
• 短信
• 国际标准书号
• 无线上网
• 地理位置(经度和纬度)
• AAMVA驾驶执照/身份证

Answer 3

这是一个示例代码:我的应用程序使用ZXing条形码扫描仪.

1. 你需要这两个类: IntentIntegrator和 IntentResult

2. 调用扫描器(例如OnClickListener,OnMenuItemSelected ...),"PRODUCT_MODE" - 它扫描标准1D条形码(你可以添加更多):

   IntentIntegrator.initiateScan(this, 
              "Warning", 
              "ZXing Barcode Scanner is not installed, download?",
              "Yes", "No",
              "PRODUCT_MODE");
   

3. 获取条形码的结果:

   public void onActivityResult(int requestCode, int resultCode, Intent intent) {  
     switch (requestCode) {
     case IntentIntegrator.REQUEST_CODE:
        if (resultCode == Activity.RESULT_OK) {
   
           IntentResult intentResult = 
              IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
   
           if (intentResult != null) {
   
              String contents = intentResult.getContents();
              String format = intentResult.getFormatName();
   
              this.elemQuery.setText(contents);
              this.resume = false;
              Log.d("SEARCH_EAN", "OK, EAN: " + contents + ", FORMAT: " + format);
           } else {
              Log.e("SEARCH_EAN", "IntentResult je NULL!");
           }
        } else if (resultCode == Activity.RESULT_CANCELED) {
           Log.e("SEARCH_EAN", "CANCEL");
        }
     }
   }
   

内容包含条形码编号

Answer 4

以下是使用相机api的示例代码

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.util.SparseArray;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.io.IOException;
import com.google.android.gms.vision.CameraSource;
import com.google.android.gms.vision.Detector;
import com.google.android.gms.vision.Frame;
import com.google.android.gms.vision.barcode.Barcode;
import com.google.android.gms.vision.barcode.BarcodeDetector;

public class MainActivity extends AppCompatActivity {

TextView barcodeInfo;
SurfaceView cameraView;
CameraSource cameraSource;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    cameraView = (SurfaceView) findViewById(R.id.camera_view);
      barcodeInfo = (TextView) findViewById(R.id.txtContent);


    BarcodeDetector barcodeDetector =
            new BarcodeDetector.Builder(this)
                    .setBarcodeFormats(Barcode.CODE_128)//QR_CODE)
                    .build();

    cameraSource = new CameraSource
            .Builder(this, barcodeDetector)
            .setRequestedPreviewSize(640, 480)
            .build();

    cameraView.getHolder().addCallback(new SurfaceHolder.Callback() {
        @Override
        public void surfaceCreated(SurfaceHolder holder) {

            try {
                cameraSource.start(cameraView.getHolder());
            } catch (IOException ie) {
                Log.e("CAMERA SOURCE", ie.getMessage());
            }
        }

        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            cameraSource.stop();
        }
    });


    barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
        @Override
        public void release() {
        }

        @Override
        public void receiveDetections(Detector.Detections<Barcode> detections) {

            final SparseArray<Barcode> barcodes = detections.getDetectedItems();

            if (barcodes.size() != 0) {
                barcodeInfo.post(new Runnable() {    // Use the post method of the TextView
                    public void run() {
                        barcodeInfo.setText(    // Update the TextView
                                barcodes.valueAt(0).displayValue
                        );
                    }
                });
            }
        }
    });
}
}

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.gateway.cameraapibarcode.MainActivity">

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <SurfaceView
        android:layout_width="640px"
        android:layout_height="480px"
        android:layout_centerVertical="true"
        android:layout_alignParentLeft="true"
        android:id="@+id/camera_view"/>

    <TextView
        android:text=" code reader"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/txtContent"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Process"
        android:id="@+id/button"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true" />
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imgview"/>
</LinearLayout>
</RelativeLayout>

的build.gradle(模块:APP)

在依赖项中添加 编译'com.google.android.gms:play-services:7.8.+'

Answer 5

模块应用：

implementation 'com.google.zxing:core:3.2.1'

implementation 'com.journeyapps:zxing-android-embedded:3.2.0@aar'

AndroidManifest.xml

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

主活动.java

public class MainActivity extends AppCompatActivity {

    Button BarCode;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        BarCode = findViewById(R.id.button_barcode);
        final Activity activity = this;

        BarCode.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                IntentIntegrator intentIntegrator = new IntentIntegrator(activity);
                intentIntegrator.setDesiredBarcodeFormats(intentIntegrator.ALL_CODE_TYPES);
                intentIntegrator.setBeepEnabled(false);
                intentIntegrator.setCameraId(0);
                intentIntegrator.setPrompt("SCAN");
                intentIntegrator.setBarcodeImageEnabled(false);
                intentIntegrator.initiateScan();
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        IntentResult Result = IntentIntegrator.parseActivityResult(requestCode , resultCode ,data);
        if(Result != null){
            if(Result.getContents() == null){
                Log.d("MainActivity" , "cancelled scan");
                Toast.makeText(this, "cancelled", Toast.LENGTH_SHORT).show();
            }
            else {
                Log.d("MainActivity" , "Scanned");
                Toast.makeText(this,"Scanned -> " + Result.getContents(), Toast.LENGTH_SHORT).show();
            }
        }
        else {
            super.onActivityResult(requestCode , resultCode , data);
        }
    }
}