Android 吐司没有显示出来

调用服务时，我正在获取结果。如果结果字符串get等于20，则我希望显示toast…我正在获取结果，但无法显示toast消息。。。 请查找下面的代码。。 能够显示System.out.println（“检查值”）；但不是烤面包

    private String serviceCalling() {

    // TODO Auto-generated method stub
    int responseCode = 0;
    JSONObject jObjet = null;

    String result = "";
    InputStream is = null;

    try {
        HttpClient httpclient = new DefaultHttpClient();
        // HttpPost httppost = new
        // HttpPost("");

        HttpPost httppost = new HttpPost("webservice url");

        HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();
        is = entity.getContent();

        responseCode = response.getStatusLine().getStatusCode();

        System.out.println("responseCode::" + responseCode);

    } catch (Exception e) {
        Log.e("NO CONNECTION", "Error in http connection " + e.toString());
    }

    // convert response to string
    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();

        result = sb.toString();


        int valueLength = result.length();

        if (valueLength == 20){

            Toast.makeText(LoginScreen.this, "Detilas Check", Toast.LENGTH_SHORT).show();


        }

        System.out.println("response" + result);
    } catch (Exception e) {
        Log.e("CANT CONVERT DATA",
                "Error converting result " + e.toString());
    }

    try {


            jObjet = new JSONObject(result);
            JSONArray jArray = jObjet.getJSONArray("login");
            JSONObject jsonObject = jArray.getJSONObject(0);
            String id = jsonObject.getString("id");
            String count = jsonObject.getString("my_ads_list_start_count");
            Intent intent = new Intent(LoginScreen.this, HomeScreen.class);
            intent.putExtra("ID", id);
            intent.putExtra("ADDCOUNT", count);


            startActivity(intent);
            finish();
//              System.out.println("id:::::::::" + id);
//              System.out.println("count:::::::::" + count);


    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return result;
}

---

无法在后台线程上更新UI。在后台线程上调用新线程中的WebService调用。因此，您必须在UI线程上更新UI

检查此代码：-

    runOnUiThread(new Runnable() {

        @Override
        public void run() {
            Toast.makeText(LoginScreen.this, "Details Check", Toast.LENGTH_SHORT).show();
        }
    });

---

无法在后台线程上更新UI。在后台线程上调用新线程中的WebService调用。因此，您必须在UI线程上更新UI

检查此代码：-

    runOnUiThread(new Runnable() {

        @Override
        public void run() {
            Toast.makeText(LoginScreen.this, "Details Check", Toast.LENGTH_SHORT).show();
        }
    });

所以

而不是

if (valueLength == 20){

所以

而不是

if (valueLength == 20){

---

您是否使用异步任务调用服务..？您的代码检查字符串的长度，您正在查找值“20”，对吗？请检查我的回答您是否使用异步任务调用服务..？您的代码检查字符串的长度，您正在查找值“20”，对吗？请检查我的答案，我想必须添加用户1632209的答案。你应该在ui中调用它，我想你必须添加user1632209的答案。您应该在ui线程中调用它