如何将图像上传到Php服务器并存储在phpmyadmin中

我基本上是从Android上传图像并上传到PHP服务器,但在这里我没有得到任何与此代码或图像上传的连接.
我收到了这个错误.

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

但据我所知,我给了正确的连接和PHP文件也在正确的域.
看看我的代码：
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

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

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

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