Question

I am basically tring to upload image from android and upload it to php server but here i’m not getting any connection with this code or image upload
.
I’m getting this error .

Error in http connection java.net.UnknownHostException: host name

but as per my knowledge i given correct connection and php file also in correct domain.
Look at my code :
UploadImage.java

public class UploadImage extends Activity {
InputStream inputStream;
    @Override
public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);

        Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.icon);   
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream); //compress to which format you want.
        byte [] byte_arr = stream.toByteArray();
        String image_str = Base64.encodeBytes(byte_arr);
        ArrayList<NameValuePair> nameValuePairs = new  ArrayList<NameValuePair>();

        nameValuePairs.add(new BasicNameValuePair("image",image_str));

        try{
            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost("http://server.com/uploadimage/uploadimage.php");
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            HttpResponse response = httpclient.execute(httppost);
            String the_string_response = convertResponseToString(response);
            Toast.makeText(UploadImage.this, "Response " + the_string_response, Toast.LENGTH_LONG).show();
        }catch(Exception e){
              Toast.makeText(UploadImage.this, "ERROR " + e.getMessage(), Toast.LENGTH_LONG).show();
              System.out.println("Error in http connection "+e.toString());
        }
    }

    public String convertResponseToString(HttpResponse response) throws IllegalStateException, IOException{

         String res = "";
         StringBuffer buffer = new StringBuffer();
         inputStream = response.getEntity().getContent();
         int contentLength = (int) response.getEntity().getContentLength(); //getting content length…..
         Toast.makeText(UploadImage.this, "contentLength : " + contentLength, Toast.LENGTH_LONG).show();
         if (contentLength < 0){
         }
         else{
                byte[] data = new byte[512];
                int len = 0;
                try
                {
                    while (-1 != (len = inputStream.read(data)) )
                    {
                        buffer.append(new String(data, 0, len)); //converting to string and appending  to stringbuffer…..
                    }
                }
                catch (IOException e)
                {
                    e.printStackTrace();
                }
                try
                {
                    inputStream.close(); // closing the stream…..
                }
                catch (IOException e)
                {
                    e.printStackTrace();
                }
                res = buffer.toString();     // converting stringbuffer to string…..

                Toast.makeText(UploadImage.this, "Result : " + res, Toast.LENGTH_LONG).show();
                //System.out.println("Response => " +  EntityUtils.toString(response.getEntity()));
         }
         return res;
    }

}

Php Code :

<?php
$base=$_REQUEST['image'];
 $binary=base64_decode($base);
header('Content-Type: bitmap; charset=utf-8');
$file = fopen('uploaded_image.jpg', 'wb');
fwrite($file, $binary);
fclose($file);
echo 'Image upload complete!!, Please check your php file directory……';?>

Any one known this issue ? if any one know how to store in mysql database from php file and fetch viceversa please suggest me here…

Answer 1

The problem is very clear …

Error in http connection java.net.UnknownHostException: host name

means that the HttpPost cannot make a connection using the hostname you supplied – because the hostname you supplied isn’t known.

If you take the hostname from this line :

HttpPost httppost = new HttpPost("http://server.com/uploadimage/uploadimage.php");

and put it in a browser on the same device what happens … i suggest you will get an error saying unable to connect to host. If this works then i suggest you check the following line is in your manifest :

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

Also ensure that the PHP file contains the following header if your using a JPEG:

header('Content-Type: image/jpg');