Android studio 条码读取

Question

I'm building an app in android studio to read barcodes and store them into SQL Database. But I want the device to read only certain barcodes and return a false Toast message if the wrong barcode is read. The device I'm using is Symbol TC70. Basically the barcodes that I want the app to read are the SSCC barcodes and if they start with "K02" that would be the wrong barcode, the one that needs to be read starts with "K00" and has 18 digits. I've tried multiple code lines with no success. This is the main code that i started with.

private String getSerialnumber() {
    String serialNumber;
    serialNumber = "";
    if (Build.VERSION.SDK_INT >= 26) {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) {
           
            serialNumber = android.os.Build.getSerial();
        } else {
            serialNumber = "Unknown barcode!";
        }
    } else {
        serialNumber = android.os.Build.SERIAL;
    }
    return serialNumber;
}

Answer 1

did you try check the return serial number as string like these?

private String getSerialnumber() {
String serialNumber;
serialNumber = "";
if (Build.VERSION.SDK_INT >= 26) {
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) {
       
        serialNumber = android.os.Build.getSerial();
        if(!serialNumber.substring(0,4).quals('SSCC'))
            serialNumber = "wrong barcode";
    } else {
        serialNumber = "Unknown barcode!";
    }
} else {
    serialNumber = android.os.Build.SERIAL;
}
return serialNumber;
}