Android 中的 Soap 字符编码

Question

我可以通过我在下面共享的代码调用网络服务，这没问题，但是当我使用土耳其字符向参数发送值时，出现了编码问题。当我将编码字符集 utf-8 更改为 iso-8859-9 时，一些土耳其字符会正确显示（ç、ö、ü），但 3 个字母（ı、ğ、ş）不会改变。为什么会发生这种情况？

abcçdefg*?h?*ijklmnoöprs?tuüvyz 必须是：abcçdefg*ğ*h*ı*ijklmnoöprs*ş*tuüvyz

final DefaultHttpClient httpClient=new DefaultHttpClient(); HttpParams params = httpClient.getParams();
        HttpConnectionParams.setConnectionTimeout(params, 10000);
        HttpConnectionParams.setSoTimeout(params, 15000);
        // set parameter
        HttpProtocolParams.setUseExpectContinue(httpClient.getParams(), true);

        // POST the envelope
        HttpPost httppost = new HttpPost(parameters[0]);
        // add headers
        httppost.setHeader("soapaction", parameters[1]);
        httppost.setHeader("Content-Type", "text/xml; charset=iso-8859-9");

        String responseString="";
        try {

            HttpEntity entity = new StringEntity(parameters[2]); 
            httppost.setEntity(entity);

            // extended class from BasicResponseHandler
            ResponseHandler<String> rh=new ResponseHandlerTr();

            responseString=httpClient.execute(httppost, rh); 

        } 
        catch (Exception e) {
            Log.v("exception", e.toString());
        }

        // close the connection
        httpClient.getConnectionManager().shutdown();
        return responseString;