简易QR码库

Question

在我的应用程序中，我需要阅读Qr代码。我在网上搜索并找到了Zing代码但是很多开发人员使用它时遇到了问题，而且它似乎有问题！

如果我假设我的客户在他们的设备上安装了qr阅读器，我如何使用这些应用程序并通过隐式意图调用它们？

如果用户没有任何qr阅读器，应用程序会发生什么？如果它崩溃，我可以要求用户下载例如QrDroid，然后使用它吗？

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);

}

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_CANCELED){
            //handle cancel
        }
    }
}

Answer 2

如果用户没有任何qr阅读器，应用程序会发生什么？如果它崩溃，我可以要求用户下载例如QrDroid，然后使用它吗？

有趣的是，Google现在推出了Mobile Vision APIs，它们集成在游戏服务中。

在您的Gradle文件中添加：

compile 'com.google.android.gms:play-services-vision:11.4.0'

取自QR code tutorial。

Answer 3

Zxing是一个很好的库来执行Qr代码扫描和生成。以下实现使用Zxing库扫描QR码图像不要忘记在build.gradle中添加以下依赖项

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

代码扫描程序活动：

public class QrCodeScanner extends AppCompatActivity implements ZXingScannerView.ResultHandler {
    private ZXingScannerView mScannerView;

    @Override
    public void onCreate(Bundle state) {
        super.onCreate(state);
        // Programmatically initialize the scanner view
        mScannerView = new ZXingScannerView(this);
        // Set the scanner view as the content view
        setContentView(mScannerView);
    }

    @Override
    public void onResume() {
        super.onResume();
        // Register ourselves as a handler for scan results.
        mScannerView.setResultHandler(this);
        // Start camera on resume
        mScannerView.startCamera();
    }

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

    @Override
    public void handleResult(Result rawResult) {
        // Do something with the result here
        // Prints scan results
        Logger.verbose("result", rawResult.getText());
        // Prints the scan format (qrcode, pdf417 etc.)
        Logger.verbose("result", rawResult.getBarcodeFormat().toString());
        //If you would like to resume scanning, call this method below:
        //mScannerView.resumeCameraPreview(this);
        Intent intent = new Intent();
        intent.putExtra(AppConstants.KEY_QR_CODE, rawResult.getText());
        setResult(RESULT_OK, intent);
        finish();
    }
}

Answer 4

我创建了一个简单的示例教程。您可以阅读此内容并在您的应用程序中使用。

http://ribinsandroidhelper.blogspot.in/2013/03/qr-code-reading-on-your-application.html

通过此链接，您可以下载qrcode库项目并导入工作区并将库添加到项目中

并将此代码复制到您的活动

 Intent intent = new Intent("com.google.zxing.client.android.SCAN");
 startActivityForResult(intent, 0);

 public void onActivityResult(int requestCode, int resultCode, Intent intent) {
     if (requestCode == 0) {
         if (resultCode == RESULT_OK) {
             String contents = intent.getStringExtra("SCAN_RESULT");
             String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
             Toast.makeText(this, contents,Toast.LENGTH_LONG).show();
             // Handle successful scan
         } else if (resultCode == RESULT_CANCELED) {
             //Handle cancel
         }
     }
}

Answer 5

在android studio中，你可以使用下面的流程创建＆amp;阅读二维码＆amp;图像看起来像钟声

创建一个android studio空项目

在app.gradle中添加库

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

在activity.main xml中使用bellow ..

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context="com.example.enamul.qrcode.MainActivity">

<LinearLayout
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:layout_margin="20dp"
  android:orientation="vertical">


<EditText
    android:id="@+id/editText"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:hint="Enter Text Here" />

<Button
    android:id="@+id/button"
    android:layout_width="fill_parent"
    android:layout_height="50dp"
    android:layout_below="@+id/editText"
    android:text="Click Here TO generate qr code"
    android:textAllCaps="false"
    android:textSize="16sp" />


<Button
    android:id="@+id/btnScan"
    android:layout_width="fill_parent"
    android:layout_height="50dp"
    android:layout_below="@+id/editText"
    android:text="Scan Your QR Code"
    android:textAllCaps="false"
    android:textSize="16sp" />

<TextView
    android:id="@+id/tv_qr_readTxt"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />


<ImageView
    android:id="@+id/imageView"
    android:layout_width="match_parent"
    android:layout_height="200dp"
    android:layout_below="@+id/button"
    android:src="@android:drawable/ic_dialog_email" />


</LinearLayout>

</LinearLayout>

在MainActivity中，您可以使用以下代码

public class MainActivity extends AppCompatActivity {
  ImageView imageView;
  Button button;
  Button btnScan;
  EditText editText;
  String EditTextValue ;
  Thread thread ;
  public final static int QRcodeWidth = 350 ;
  Bitmap bitmap ;

  TextView tv_qr_readTxt;

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

    imageView = (ImageView)findViewById(R.id.imageView);
    editText = (EditText)findViewById(R.id.editText);
    button = (Button)findViewById(R.id.button);
    btnScan = (Button)findViewById(R.id.btnScan);
     tv_qr_readTxt = (TextView) findViewById(R.id.tv_qr_readTxt);

button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {



        if(!editText.getText().toString().isEmpty()){
            EditTextValue = editText.getText().toString();

            try {
                bitmap = TextToImageEncode(EditTextValue);

                imageView.setImageBitmap(bitmap);

            } catch (WriterException e) {
                e.printStackTrace();
            }
        }
        else{
            editText.requestFocus();
            Toast.makeText(MainActivity.this, "Please Enter Your Scanned Test" , Toast.LENGTH_LONG).show();
        }

      }
  });


btnScan.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {

        IntentIntegrator integrator = new IntentIntegrator(MainActivity.this);
        integrator.setDesiredBarcodeFormats(IntentIntegrator.ALL_CODE_TYPES);
        integrator.setPrompt("Scan");
        integrator.setCameraId(0);
        integrator.setBeepEnabled(false);
        integrator.setBarcodeImageEnabled(false);
        integrator.initiateScan();

     }
   });
    }


 Bitmap TextToImageEncode(String Value) throws WriterException {
   BitMatrix bitMatrix;
    try {
    bitMatrix = new MultiFormatWriter().encode(
            Value,
            BarcodeFormat.DATA_MATRIX.QR_CODE,
            QRcodeWidth, QRcodeWidth, null
    );

    } catch (IllegalArgumentException Illegalargumentexception) {

     return null;
   }
  int bitMatrixWidth = bitMatrix.getWidth();

  int bitMatrixHeight = bitMatrix.getHeight();

  int[] pixels = new int[bitMatrixWidth * bitMatrixHeight];

  for (int y = 0; y < bitMatrixHeight; y++) {
      int offset = y * bitMatrixWidth;

     for (int x = 0; x < bitMatrixWidth; x++) {

         pixels[offset + x] = bitMatrix.get(x, y) ?
                getResources().getColor(R.color.QRCodeBlackColor):getResources().getColor(R.color.QRCodeWhiteColor);
      }
    }
    Bitmap bitmap = Bitmap.createBitmap(bitMatrixWidth, bitMatrixHeight, Bitmap.Config.ARGB_4444);

   bitmap.setPixels(pixels, 0, 350, 0, 0, bitMatrixWidth, bitMatrixHeight);
   return bitmap;
}




  @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.e("Scan*******", "Cancelled scan");

     } else {
        Log.e("Scan", "Scanned");

        tv_qr_readTxt.setText(result.getContents());
        Toast.makeText(this, "Scanned: " + result.getContents(), Toast.LENGTH_LONG).show();
     }
  } else {
      // This is important, otherwise the result will not be passed to the fragment
    super.onActivityResult(requestCode, resultCode, data);
     }
   }
 }

您可以从GitHub下载完整的源代码。 GitHub链接是：https://github.com/enamul95/QRCode

Answer 6

使用像ZXing这样的QR库...我有很好的使用经验，QrDroid很麻烦。如果您必须依赖外部阅读器，请依靠像Google Goggles这样的标准阅读器！

Answer 7

简易QR码库

一个简单的Android Easy QR代码库。这很容易使用，按照以下步骤使用该库。

对于Gradle：

步骤1。将其添加到存储库末尾的root build.gradle中：

allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

第2步。添加依赖项：

dependencies {
        compile 'com.github.mrasif:easyqrlibrary:v1.0.0'
}

对于Maven：

步骤1.将JitPack存储库添加到您的构建文件中：

<repositories>
    <repository>
        <id>jitpack.io</id>
        <url>https://jitpack.io</url>
    </repository>
</repositories>

第2步。添加依赖项：

<dependency>
    <groupId>com.github.mrasif</groupId>
    <artifactId>easyqrlibrary</artifactId>
    <version>v1.0.0</version>
</dependency>

对于SBT：

步骤1.将JitPack存储库添加到您的build.sbt文件中：

resolvers += "jitpack" at "https://jitpack.io"

第2步。添加依赖项：

libraryDependencies += "com.github.mrasif" % "easyqrlibrary" % "v1.0.0"

对于雷宁根：

第1步。将其添加到存储库末尾的project.clj中：

:repositories [["jitpack" "https://jitpack.io"]]

第2步。添加依赖项：

:dependencies [[com.github.mrasif/easyqrlibrary "v1.0.0"]]

将此添加到您的布局xml文件中：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="20dp"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tvData"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="No QR Data"/>
    <Button
        android:id="@+id/btnQRScan"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="QR Scan"/>

</LinearLayout>

将此添加到您的活动Java文件中：

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    TextView tvData;
    Button btnQRScan;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tvData=findViewById(R.id.tvData);
        btnQRScan=findViewById(R.id.btnQRScan);

        btnQRScan.setOnClickListener(this);
    }

    @Override
    public void onClick(View view){
        switch (view.getId()){
            case R.id.btnQRScan: {
                Intent intent=new Intent(MainActivity.this, QRScanner.class);
                startActivityForResult(intent, EasyQR.QR_SCANNER_REQUEST);
            } break;
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode){
            case EasyQR.QR_SCANNER_REQUEST: {
                if (resultCode==RESULT_OK){
                    tvData.setText(data.getStringExtra(EasyQR.DATA));
                }
            } break;
        }
    }
}

对于自定义扫描仪屏幕，只需在启动扫描仪活动时添加这些行。

Intent intent=new Intent(MainActivity.this, QRScanner.class);
intent.putExtra(EasyQR.IS_TOOLBAR_SHOW,true);
intent.putExtra(EasyQR.TOOLBAR_DRAWABLE_ID,R.drawable.ic_audiotrack_dark);
intent.putExtra(EasyQR.TOOLBAR_TEXT,"My QR");
intent.putExtra(EasyQR.TOOLBAR_BACKGROUND_COLOR,"#0588EE");
intent.putExtra(EasyQR.TOOLBAR_TEXT_COLOR,"#FFFFFF");
intent.putExtra(EasyQR.BACKGROUND_COLOR,"#000000");
intent.putExtra(EasyQR.CAMERA_MARGIN_LEFT,50);
intent.putExtra(EasyQR.CAMERA_MARGIN_TOP,50);
intent.putExtra(EasyQR.CAMERA_MARGIN_RIGHT,50);
intent.putExtra(EasyQR.CAMERA_MARGIN_BOTTOM,50);
startActivityForResult(intent, EasyQR.QR_SCANNER_REQUEST);

您完成了。参考链接：https://mrasif.github.io/easyqrlibrary

Android，如何在我的应用程序中阅读QR码？

7 个答案:

简易QR码库

对于Gradle：

对于Maven：

对于SBT：

对于雷宁根：

将此添加到您的布局xml文件中：

将此添加到您的活动Java文件中：