Implement OnReceiverListener for the activity:

In the class that will be a delegate of SecureMag, implement OnReceiverListener. Add the implemented methods to eliminate any error messages.

public class MainActivity extends Activity implements  OnReceiverListener {

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

    @Override
    public void ICCNotifyInfo(byte[] arg0, String arg1) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void LoadXMLConfigFailureInfo(int arg0, String arg1) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void autoConfigCompleted(StructConfigParameters arg0) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void autoConfigProgress(int arg0) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void deviceConnected() {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void deviceDisconnected() {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void emvTransactionData(IDTEMVData arg0) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void lcdDisplay(int arg0, String[] arg1, int arg2) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void msgAudioVolumeAjustFailed() {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void msgRKICompleted(String arg0) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void msgToConnectDevice() {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void swipeMSRData(IDTMSRData arg0) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void timeout(int arg0) {
        // TODO Auto-generated method stub
        
    }
}