Zbar Scanner QR Only

Question

I am using a ZBar QR scanner for my Android application. Everything works fine and has no problems with the library and settings. The problem is that I want to make ZBar to scan only QR codes and barcodes.

Is there any way to do this? How?

This is my scan action code:

import net.sourceforge.zbar.Config; import net.sourceforge.zbar.Image; import net.sourceforge.zbar.ImageScanner; import net.sourceforge.zbar.Symbol; import net.sourceforge.zbar.SymbolSet; import android.app.Activity; import android.content.Intent; import android.content.pm.ActivityInfo; import android.content.res.Resources; import android.graphics.Color; import android.hardware.Camera; import android.hardware.Camera.AutoFocusCallback; import android.hardware.Camera.PreviewCallback; import android.hardware.Camera.Size; import android.os.Bundle; import android.os.Handler; import android.util.Log; import android.util.TypedValue; import android.view.Gravity; import android.view.View; import android.view.ViewGroup.LayoutParams; import android.widget.Button; import android.widget.FrameLayout; import android.widget.TextView; public class QRScanActivity extends Activity { private Camera mCamera; private CameraPreview mPreview; private Handler autoFocusHandler; TextView scanText; Button scanButton; ImageScanner scanner; private boolean barcodeScanned = false; private boolean previewing = true; static { System.loadLibrary("iconv"); } public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_qrscan); setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); autoFocusHandler = new Handler(); mCamera = getCameraInstance(); // Instance barcode scanner scanner = new ImageScanner(); scanner.setConfig(0, Config.X_DENSITY, 3); scanner.setConfig(0, Config.Y_DENSITY, 3); mPreview = new CameraPreview(this, mCamera, previewCb, autoFocusCB); FrameLayout preview = (FrameLayout) findViewById(R.id.cameraPreview); preview.addView(mPreview); } public void onPause() { super.onPause(); releaseCamera(); } /** A safe way to get an instance of the Camera object. */ public static Camera getCameraInstance() { Camera c = null; try { c = Camera.open(); } catch (Exception e) { } return c; } private void releaseCamera() { if (mCamera != null) { previewing = false; mCamera.setPreviewCallback(null); mCamera.release(); mCamera = null; } } private Runnable doAutoFocus = new Runnable() { public void run() { if (previewing) mCamera.autoFocus(autoFocusCB); } }; PreviewCallback previewCb = new PreviewCallback() { public void onPreviewFrame(byte[] data, Camera camera) { Camera.Parameters parameters = camera.getParameters(); Size size = parameters.getPreviewSize(); Image barcode = new Image(size.width, size.height, "Y800"); barcode.setData(data); int result = scanner.scanImage(barcode); Log.d("ZbarScanner",result+""); if (result != 0) { previewing = false; mCamera.setPreviewCallback(null); mCamera.stopPreview(); SymbolSet syms = scanner.getResults(); for (Symbol sym : syms) { barcodeScanned = true; Intent returnIntent = new Intent(); returnIntent.putExtra("result",sym.getData()); setResult(RESULT_OK,returnIntent); finish(); } } } }; // Mimic continuous auto-focusing AutoFocusCallback autoFocusCB = new AutoFocusCallback() { public void onAutoFocus(boolean success, Camera camera) { autoFocusHandler.postDelayed(doAutoFocus, 1000); } }; public void backToMain(View v){ Intent returnIntent = new Intent(); setResult(RESULT_CANCELED, returnIntent); finish(); } } 

Answer 1

You can add these codes for ImageScanner.

 scanner.setConfig(0, Config.ENABLE, 0); //Disable all the Symbols scanner.setConfig(Symbol.QRCODE, Config.ENABLE, 1); //Only QRCODE is enable 

Alternatively, you can also use the intent action "org.magiclen.barcodescanner.SCAN" to use the zbar-based barcode scanner.

 final Intent intent = new Intent("org.magiclen.barcodescanner.SCAN"); final List<ResolveInfo> list = getPackageManager().queryIntentActivities(intent, PackageManager.GET_ACTIVITIES); if (list.size() > 0) { intent.putExtra("SCAN_MODE", "QR_CODE_MODE"); // Can also use PRODUCT_MODE, SCAN_MODE, QR_CODE_MODE startActivityForResult(intent, 0); } else { // You may ask your user to install Easy Barcode Scanner } 

To get the scan result, you must override the onActivityResult method:

 public void onActivityResult(final int requestCode, final int resultCode, final Intent data) { if (requestCode == 0) { if (resultCode == Activity.RESULT_OK) { final String result = data.getStringExtra("SCAN_RESULT"); // Get scanning result final String type = data.getStringExtra("code_type"); // Get code type } else { // Not scan any code yet } } }