问从基于android的移动条码扫描器检测条码扫描事件

EN

   @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        if (event.getCharacters() != null && !event.getCharacters().isEmpty())
        //Add more code...
        return super.dispatchKeyEvent(event);

    }

const val QR_ACTION: String = "android.intent.ACTION_DECODE_DATA"
const val QR_EXTRA: String = "barcode_string"

private val receiver = object : BroadcastReceiver() {
        override fun onReceive(context: Context, intent: Intent) {
            try {
                Timber.d("Get intent ${intent.action}")
                if (QR_ACTION == intent.action) {
                    if (intent.hasExtra(QR_EXTRA)) {
                       val code = intent.getStringExtra(QR_EXTRA)
                       Timber.d("New QR code $code")
                       // now you have qr code here 
                    }
                }                    }
            } catch (t: Throwable) {
                // handle errors
            }
        }
    }