RFID Enabled Fish Tracking

Documentation of the HI-Tag Android Application

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Android HTTP Client

Declare the necessary permissions in your AndroidManifest.xml:

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

Import the relevant packages:

import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

Example GET Client:

public class HttpClient {
    private String url;
    private HttpURLConnection con;
    private InputStream is;
    private OutputStream os;
   
    public void connect(String url) {
        this.url = url;
        try {
            con = (HttpURLConnection) new URL(url).openConnection();
            con.setRequestMethod("GET");
            con.setDoInput(true);
            con.connect();
   
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
   
    public String getResponse() throws Exception {
        is = con.getInputStream();
        byte[] b1 = new byte[1024];
        StringBuffer buffer = new StringBuffer();
   
        while (is.read(b1) != -1)
            buffer.append(new String(b1));
   
        con.disconnect();
   
        return buffer.toString();
    }
}

Example POST Client with Multipart Form Data:

public class HttpClient {
    private String url;
    private HttpURLConnection con;
    private InputStream is;
    private OutputStream os;
    private final String boundary = "|";
    private final String delimiter = "--";

    public void connect(String url) {
        this.url = url;
        try {
            con = (HttpURLConnection) (new URL(url)).openConnection();
            con.setRequestMethod("POST");
            con.setDoInput(true);
            con.setDoOutput(true);
            con.setRequestProperty("Connection", "Keep-Alive");
            con.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
            con.connect();
            os = con.getOutputStream();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    public void addFormPart(String paramName, String value) throws Exception {
        writeParamData(paramName, value);
    }

    public void addFilePart(String paramName, String fileName, byte[] data) throws Exception {
        os.write((delimiter + boundary + "\r\n").getBytes());
        os.write(("Content-Disposition: form-data; name=\"" + paramName + "\"; filename=\"" + fileName + "\"\r\n").getBytes());
        os.write(("Content-Type: application/octet-stream\r\n").getBytes());
        os.write(("Content-Transfer-Encoding: binary\r\n").getBytes());
        os.write("\r\n".getBytes());

        os.write(data);

        os.write("\r\n".getBytes());
    }

    public void finishMultipart() throws Exception {
        os.write((delimiter + boundary + delimiter + "\r\n").getBytes());
    }


    public String getResponse() throws Exception {
        is = con.getInputStream();
        byte[] b1 = new byte[1024];
        StringBuffer buffer = new StringBuffer();

        while (is.read(b1) != -1)
            buffer.append(new String(b1));

        con.disconnect();

        return buffer.toString();
    }

    private void writeParamData(String paramName, String value) throws Exception {
        os.write((delimiter + boundary + "\r\n").getBytes());
        os.write("Content-Type: text/plain\r\n".getBytes());
        os.write(("Content-Disposition: form-data; name=\"" + paramName + "\"\r\n").getBytes());
        os.write(("\r\n" + value + "\r\n").getBytes());
    }
}