如何在安卓系统中扫描QRCode

Question

我找到了如何扫描条形码的a tutorial。但在我的应用程序中，我必须扫描二维码。如何在Android中扫描二维码？

Answer 1

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);
}

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
        }
    }
}

Answer 2

2016年更新

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

Barcode API可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：

• 一维条码: EAN-13、EAN-8、UPC-A、UPC-E、Code-39、Code-93、Code-128、ITF、Codabar
• 2D条码:二维码、数据矩阵、PDF-417、AZTEC

它自动解析以下支持格式的二维码、数据矩阵、PDF-417和Aztec值：

• URL
• Contact信息(VCARD、etc.)
• Calendar event
• Email
• Phone
• SMS
• ISBN
• WiFi
• Geo-location (latitude和longitude)
• AAMVA驾驶执照/ID

查看codelab - Barcode Detection with the Mobile Vision API。

Answer 3

您可以使用zxing轻松扫描二维码，并在gradle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'

然后在你的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，希望它能帮到你。