Download image on Android

Question

Hi, I am new to android devlopment I want to know how to upload an image to android I haven’t found a useful tutorial for this, you can give me some instruction, pls help me.

Answer 1

I built these lil methods for you:

private boolean handlePicture(String filePath, String mimeType) {       
    HttpURLConnection connection = null;
    DataOutputStream outStream = null;
    DataInputStream inStream = null;

    String lineEnd = "\r\n";
    String twoHyphens = "--";
    String boundary = "*****";

    int bytesRead, bytesAvailable, bufferSize;

    byte[] buffer;

    int maxBufferSize = 1*1024*1024;

    String urlString = "http://www.yourwebserver.com/youruploadscript.php";

    try {
        FileInputStream fileInputStream = null;
        try {
            fileInputStream = new FileInputStream(new File(filePath));
        } catch(FileNotFoundException e) { }
        URL url = new URL(urlString);
        connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setUseCaches(false);

        connection.setRequestMethod("POST");
        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);            

        outStream = new DataOutputStream(connection.getOutputStream());

        outStream.writeBytes(addParam("someparam", "content of some param", twoHyphens, boundary, lineEnd));                

        outStream.writeBytes(twoHyphens + boundary + lineEnd);
        outStream.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\"; filename=\"" + filePath +"\"" + lineEnd + "Content-Type: " + mimeType + lineEnd + "Content-Transfer-Encoding: binary" + lineEnd);          
        outStream.writeBytes(lineEnd);

        bytesAvailable = fileInputStream.available();
        bufferSize = Math.min(bytesAvailable, maxBufferSize);
        buffer = new byte[bufferSize];

        bytesRead = fileInputStream.read(buffer, 0, bufferSize);

          while (bytesRead > 0) {
              outStream.write(buffer, 0, bufferSize);
            bytesAvailable = fileInputStream.available();
            bufferSize = Math.min(bytesAvailable, maxBufferSize);
            bytesRead = fileInputStream.read(buffer, 0, bufferSize);
        }

          outStream.writeBytes(lineEnd);
          outStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

        fileInputStream.close();
        outStream.flush();
        outStream.close();  
    } catch (MalformedURLException e) {
        Log.e("DEBUG", "[MalformedURLException while sending a picture]");
    } catch (IOException e) {
        Log.e("DEBUG", "[IOException while sending a picture]"); 
    }

    try {
           inStream = new DataInputStream( connection.getInputStream() );
           String str;

           while (( str = inStream.readLine()) != null) {
               if(str=="1") {
                   return true;
               } else {
                   return false;
               }
           }
           inStream.close();
      } catch (IOException e){
          Log.e("DEBUG", "[IOException while sending a picture and receiving the response]");
      }
    return false;
}

private String addParam(String key, String value, String twoHyphens, String boundary, String lineEnd) {
        return twoHyphens + boundary + lineEnd + "Content-Disposition: form-data; name=\"" + key + "\"" + lineEnd + lineEnd + value + lineEnd;
}

Should work so far. On your web server, you will need a PHP script that returns “1” for a successful download and something else for the error. I also suggest doing this in ASyncTask to prevent the user from being locked out at boot time. On the server side, you have a file named "uploadedfile". Hope this helps!

Answer 2

. : np.

POST/HTTP/1.1
: jmaster
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; pl; rv: 1.9.2.10). Gecko/20100914 Firefox/3.6.10
Accept: text/html, application/xhtml + xml, application/xml; q = 0.9,/; q = 0.8
Accept-: pl, en-us; q = 0,7, en; q = 0,3
Accept-Encoding: gzip, deflate
Accept-Charset: ISO-8859-2, utf-8; q = 0.7, *; q = 0.7
Referer: http://shop/index.php/index/register/b/
Content-Type: multipart/form-data; = --------------------------- 19187836022413
X-Forwarded-For: 127.0.0.1
X-Forwarded-Host: jmaster
X-Forwarded-Server: jmaster
: Keep-Alive
-: 38682
----------------------------- 19187836022413
Content-Disposition: form-data; name= "file2"; = "Clipboard02.png" Content-Type: image/png
‰ PNG
?
... .
----------------------------- 19187836022413
.
---------------------------- 19187836022413

, .