CODEWITHSUNDEEP
androidkotlincamerazxing
Dante Gulapa
Dante Gulapa

Reputation: 111

Android not opening camera using zxing

I'm trying to make the basic ZXing functionality to scan qr codes using their basic instructions, but my camera does not open it just goes to the blank ScanActivity.

I've already added the "implementation" on module app dependency

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

and permission on AndroidManifest.xml

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

I've also manually allowed its permission on the settings of the android phone i'm testing it on

My main activity

class MainActivity : AppCompatActivity() {


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        tvResult = tvresult

        btn.setOnClickListener {
            val intent = Intent(this@MainActivity, ScanActivity::class.java)
            startActivity(intent)
        }
    }

    companion object {

        var tvResult: TextView? = null
    }
}

ScanActivity Class

class ScanActivity : AppCompatActivity(), ZXingScannerView.ResultHandler {

    private var mScannerView: ZXingScannerView? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        mScannerView = ZXingScannerView(this)
        setContentView(R.layout.activity_scan)

        mScannerView!!.setResultHandler(this) // Register ourselves as a handler for scan results.
    }

    public override fun onResume() {
        super.onResume()
        mScannerView!!.setResultHandler(this) // Register ourselves as a handler for scan results.
        mScannerView!!.startCamera()          // Start camera on resume

    }

    public override fun onPause() {
        super.onPause()
        mScannerView!!.stopCamera()           // Stop camera on pause
    }

    override fun handleResult(rawResult: Result) {
        // Do something with the result here
        // Log.v("tag", rawResult.getText()); // Prints scan results
        // Log.v("tag", rawResult.getBarcodeFormat().toString()); // Prints the scan format (qrcode, pdf417 etc.)

        MainActivity.tvResult!!.setText(rawResult.text)
        onBackPressed()

        // If you would like to resume scanning, call this method below:
        //mScannerView.resumeCameraPreview(this);
    }}

Main Activity enter image description here

after i click on the Scan barcode button it just goes to this (im expecting the camera will open because of the startCamera()

Upvotes: 0

Views: 2089

Answers (2)

Carlos Eduardo Ki Lee
Carlos Eduardo Ki Lee

Reputation: 245

Late answer, by the way if someone else has this problem, you forgot to add mScannerView in your Layout

Upvotes: 0

Grant Pullen
Grant Pullen

Reputation: 41

I had a similar issue, it was permission related. Try adding the following within the onCreate(..)

if (ContextCompat.checkSelfPermission(this@MainActivity, Manifest.permission.CAMERA) == PackageManager.PERMISSION_DENIED) {
   ActivityCompat.requestPermissions(this@MainActivity, arrayOf(Manifest.permission.CAMERA), 123)
}

Upvotes: 4

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