Android Open Source - NfcSettings Esp User Data

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License

The source code is released under:

Apache License

Java Source Code

package se.sweetpeas.android.nfcsettings;
//ww  w.ja  v  a  2 s .c o  m
import android.app.Activity;
import android.util.Log;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;

import java.util.Arrays;

/**
 * This class handles the target application user data
 */
public class EspUserData {

    private final String TAG ="NfcDemo.EspUserData";

    private int wptr = 0;
    private byte[] streamArray = new byte[2048];    // Max 2048 bytes in one stream
    private String[] supportedDevices = {
            "Unknown",
            "UnoNet+",
            "LeoFi+",
            "Uno+",
    };

    public byte[] getDevice(String system) {
        byte[] device = new byte[1];

        for(int i=0;i<supportedDevices.length;i++) {
            if (supportedDevices[i].equals(system)) {
                device[0] = (byte)i;
                return device;
            }
        }
        device[0] = 0;
        return device;
    }

    public String getDeviceString(byte device) {
        return new String(supportedDevices[device]);
    }

    public byte[] getInitialPayload() {
        return new byte[] {
                1,                                  // Sweetpeas product type number
                0,                                  // DHCP enabled or not
                (byte)192,(byte)168,0,10,           // Default IP address
                (byte)255,(byte)255,(byte)255,0,    // Default Netmask
                (byte)192,(byte)168,0,1,            // Default gateway
                80,0                                // Webserver port
        };
    }

    public void streamCreate() {
        wptr = 0;
    }

    public void streamData(byte[] data) {
        if (data.length == 0) {
            return;
        }

        // Copy data to stream buffer
        for (int i=0;i<data.length;i++) {
            streamArray[wptr++] = data[i];
        }
    }

    public byte[] getStreamArray() {
        byte[] array = new byte[wptr];
        array = Arrays.copyOfRange(streamArray, 0, wptr);
        return array;
    }

    /*
     * Support function to convert an ascii string to IP numbers
     */
    private byte[] ipToArray(String ipstring) throws ArithmeticException {
        byte[] ip = new byte[4];
        String[] parts = ipstring.split("\\.");

        if (parts.length != 4) {
            throw new ArithmeticException("Not exactly 4 parameters in ip address");
        }

        for (int i = 0; i < 4; i++) {
            ip[i] = (byte)Integer.parseInt(parts[i]);
        }

        return ip;
    }

    /*
     * Convert a byte (signed char) to an unsigned int
     * The target specific data is stored in memory as a byte array and these need to be
     * converted to the proper format before being used.
     */
    private int getUnsignedByte(byte data) {
        if (data < 0) {
            return 256 - Math.abs(data);
        }
        return data;
    }

    /**
     * Build the payload that should be written to the NFC tag memory
     */
    public void buildPayload(final Activity activity) {

        EditText et;
        CheckBox cb;

        byte[] device;
        byte[] dhcpEnabled = new byte[1];
        byte[] ip;
        byte[] netmask;
        byte[] gateway;
        int imPort;     // Intermediate variable
        byte[] port = new byte[2];

        // Read out values from gui, starting with the system name
        et = (EditText)activity.findViewById(R.id.espSystemName);
        device = getDevice(et.getText().toString());

        // DHCP enabled
        cb = (CheckBox)activity.findViewById(R.id.espEnableDhcp);
        if (cb.isChecked() == true) {
            dhcpEnabled[0] = 1;
        } else {
            dhcpEnabled[0] = 0;
        }

        // IP Address
        et = (EditText)activity.findViewById(R.id.espIpAddress);
        try {
            ip = ipToArray(et.getText().toString());
        } catch (ArithmeticException e) {
            Log.d(TAG, "Error in IP address, setting it to 0.0.0.0" + e);
            ip = new byte[4];
            ip[0] = ip[1] = ip[2] = ip[3] = 0;
        }

        // Netmask
        et = (EditText)activity.findViewById(R.id.espNetmask);
        try {
            netmask = ipToArray(et.getText().toString());
        } catch (ArithmeticException e) {
            Log.d(TAG, "Error in Netmask address, setting it to 0.0.0.0" + e);
            netmask = new byte[4];
            netmask[0] = netmask[1] = netmask[2] = netmask[3] = 0;
        }

        // Default gateway
        et = (EditText)activity.findViewById(R.id.espGateway);
        try {
            gateway = ipToArray(et.getText().toString());
        } catch (ArithmeticException e) {
            Log.d(TAG, "Error in Default gateway address, setting it to 0.0.0.0" + e);
            gateway = new byte[4];
            gateway[0] = gateway[1] = gateway[2] = gateway[3] = 0;
        }

        // Webserver port
        et = (EditText)activity.findViewById(R.id.espWebServerport);
        imPort = Integer.parseInt(et.getText().toString());
        port[0] = (byte)(imPort & 255);
        port[1] = (byte)((imPort / 256) & 255);

        // Create a new payload stream
        streamCreate();
        // Write objects to the stream
        streamData(device);
        streamData(dhcpEnabled);
        streamData(ip);
        streamData(netmask);
        streamData(gateway);
        streamData(port);
    }

    public void enableDisableAddresses(Activity activity, boolean checked) {

        Log.d(TAG, "Setting setEnabled to " + checked);
        // Enable or disable text fields accordingly.
        EditText edAddress = (EditText) activity.findViewById(R.id.espIpAddress);
        edAddress.setEnabled(checked);

        edAddress = (EditText) activity.findViewById(R.id.espNetmask);
        edAddress.setEnabled(checked);

        edAddress = (EditText) activity.findViewById(R.id.espGateway);
        edAddress.setEnabled(checked);
    }

    /*
     * It is always our responsibility to handle what happens on the screen, so all onClick events
     * from the main activity gets routed here.
     */
    public void onClickEvent(Activity activity, View view) {

        switch (view.getId()) {
            case R.id.espEnableDhcp:
                boolean checked = !((CheckBox) view).isChecked();
                enableDisableAddresses(activity, checked);
                break;

            default:
                Log.d(TAG, "Unhandled view element detected !");
        }
    }

    public void setPayload(Activity activity, byte[] payload) {
        EditText et;

        // system name
        et = (EditText)activity.findViewById(R.id.espSystemName);
        et.setText(this.getDeviceString(payload[0]));

        // DHCP Switch
        CheckBox cb = (CheckBox)activity.findViewById(R.id.espEnableDhcp);
        if (payload[1] != 0) {
            cb.setChecked(true);
            enableDisableAddresses(activity, false);
        } else {
            cb.setChecked(false);
            enableDisableAddresses(activity, true);
        }

        // Ip Address
        String ip = new String();
        ip += Integer.toString(getUnsignedByte(payload[2]));
        ip += ".";
        ip += Integer.toString(getUnsignedByte(payload[3]));
        ip += ".";
        ip += Integer.toString(getUnsignedByte(payload[4]));
        ip += ".";
        ip += Integer.toString(getUnsignedByte(payload[5]));
        et = (EditText)activity.findViewById(R.id.espIpAddress);
        et.setText(ip);

        // Netmask Address
        String nm = new String();
        nm += Integer.toString(getUnsignedByte(payload[6]));
        nm += ".";
        nm += Integer.toString(getUnsignedByte(payload[7]));
        nm += ".";
        nm += Integer.toString(getUnsignedByte(payload[8]));
        nm += ".";
        nm += Integer.toString(getUnsignedByte(payload[9]));
        et = (EditText)activity.findViewById(R.id.espNetmask);
        et.setText(nm);

        // Default gateway
        String gw = new String();
        gw += Integer.toString(getUnsignedByte(payload[10]));
        gw += ".";
        gw += Integer.toString(getUnsignedByte(payload[11]));
        gw += ".";
        gw += Integer.toString(getUnsignedByte(payload[12]));
        gw += ".";
        gw += Integer.toString(getUnsignedByte(payload[13]));
        et = (EditText)activity.findViewById(R.id.espGateway);
        et.setText(gw);

        //  Webserver port
        int port = getUnsignedByte(payload[14]) |
                getUnsignedByte(payload[15]) * 256;
        et = (EditText)activity.findViewById(R.id.espWebServerport);
        et.setText(Integer.toString(port));
    }

    public void screenInit(Activity activity) {
        // Connect our new key listener to the address field.
        EditText edAddress = (EditText) activity.findViewById(R.id.espIpAddress);
        edAddress.setKeyListener(IPAddressKeyListener.getInstance());

        edAddress = (EditText) activity.findViewById(R.id.espNetmask);
        edAddress.setKeyListener(IPAddressKeyListener.getInstance());

        edAddress = (EditText) activity.findViewById(R.id.espGateway);
        edAddress.setKeyListener(IPAddressKeyListener.getInstance());

        edAddress = (EditText) activity.findViewById(R.id.espWebServerport);
        edAddress.setKeyListener(IPAddressKeyListener.getInstance());

    }
}

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