NameValuePair，HttpParams，HttpConnection Params在登录app的服务器请求类上已弃用
第一次在这里问一个问题，并且是android编程的新手。 我正在按照在线youtube教程创建用户“Tonikami TV”的登录。 应用程序的一切都很好，除了它涉及到serverRequests类。 我得到了NameValuePair ， HttpParams等不推荐使用，我知道它已经过时HttpParams支持自API 22.我已经搜索了一些固定的或替代的但是不能真正理解它们以及如何将它们应用到我的代码中。 任何帮助将不胜感激。 谢谢 ：）
@Override protected Void doInBackground(Void... params) { ArrayList dataToSend = new ArrayList(); dataToSend.add(new BasicNameValuePair("firstname", user.FirstName)); dataToSend.add(new BasicNameValuePair("lastname", user.LastName)); dataToSend.add(new BasicNameValuePair("age", user.Age + "")); dataToSend.add(new BasicNameValuePair("emailaddress", user.EmailAddress)); dataToSend.add(new BasicNameValuePair("password", user.Password)); //possible alternative code found on stack overflow don't know exactly what to do from here. ContentValues values= new ContentValues(); values.put("firstname", user.FirstName); values.put("lastname", user.LastName); values.put("age", user.Age + ""); values.put("emailaddress",user.EmailAddress); values.put("password",user.Password); // HttpParams httpRequestParams = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpRequestParams, CONNECTION_TIMEOUT); HttpConnectionParams.setSoTimeout(httpRequestParams, CONNECTION_TIMEOUT); HttpClient client = new DefaultHttpClient(httpRequestParams); HttpClient post = new HttpPost(SERVER_ADDRESS + "Register.php"); try{ post.setEntity(new URLEncoderFormEntity(dataToSend)); client.execute(post); }catch (Exception e){ e.printStackTrace(); } return null; }
这是ServerRequests类中的完整代码。 道歉，如果它相当长。
public class ServerRequests { ProgressDialog progressDialog; public static final int CONNECTION_TIMEOUT = 1000 * 15; public static final String SERVER_ADDRESS = "http://lok8.hostingsiteforfree.com"; public ServerRequests(Context context){ progressDialog = new ProgressDialog(context); progressDialog.setCancelable(false); progressDialog.setTitle("Processing"); progressDialog.setMessage("Please Wait..."); } public void storeUserDataInBackground(User user, GetUserCallback userCallback){ progressDialog.show(); new StoreUserDataAsyncTask(user,userCallback).execute(); } public void fetchUserDataInBackground(User user, GetUserCallback callback) { progressDialog.show(); new fetchUserDataAsyncTask(user, callback).execute(); } public class StoreUserDataAsyncTask extends AsyncTask{ User user; GetUserCallback userCallback; public StoreUserDataAsyncTask(User user, GetUserCallback userCallback){ this.user = user; this.userCallback = userCallback; } @Override protected Void doInBackground(Void... params) { ArrayList dataToSend = new ArrayList(); dataToSend.add(new BasicNameValuePair("firstname", user.FirstName)); dataToSend.add(new BasicNameValuePair("lastname", user.LastName)); dataToSend.add(new BasicNameValuePair("age", user.Age + "")); dataToSend.add(new BasicNameValuePair("emailaddress", user.EmailAddress)); dataToSend.add(new BasicNameValuePair("password", user.Password)); //possible alternative code found on stack overflow don't know exactly what to do from here. ContentValues values= new ContentValues(); values.put("firstname", user.FirstName); values.put("lastname", user.LastName); values.put("age", user.Age + ""); values.put("emailaddress",user.EmailAddress); values.put("password",user.Password); // HttpParams httpRequestParams = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpRequestParams, CONNECTION_TIMEOUT); HttpConnectionParams.setSoTimeout(httpRequestParams, CONNECTION_TIMEOUT); HttpClient client = new DefaultHttpClient(httpRequestParams); HttpClient post = new HttpPost(SERVER_ADDRESS + "Register.php"); try{ post.setEntity(new URLEncoderFormEntity(dataToSend)); client.execute(post); }catch (Exception e){ e.printStackTrace(); } return null; } @Override protected void onPostExecute(Void aVoid) { progressDialog.dismiss(); userCallback.done(null); super.onPostExecute(aVoid); } } public class fetchUserDataAsyncTask extends AsyncTask { User user; GetUserCallback userCallback; public fetchUserDataAsyncTask(User user, GetUserCallback userCallback) { this.user = user; this.userCallback = userCallback; } @Override protected User doInBackground(Void... params) { ArrayList dataToSend = new ArrayList(); dataToSend.add(new BasicNameValuePair("emailaddress", user.EmailAddress)); dataToSend.add(new BasicNameValuePair("password", user.Password)); HttpParams httpRequestParams = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpRequestParams, CONNECTION_TIMEOUT); HttpConnectionParams.setSoTimeout(httpRequestParams, CONNECTION_TIMEOUT); HttpClient client = new DefaultHttpClient(httpRequestParams); HttpClient post = new HttpPost(SERVER_ADDRESS + "FetchUserData.php"); User returnedUser = null; try{ post.setEntity(new URLEncoderFormEntity(dataToSend)); HttpResponse httpResponse = client.execute(post); HttpEntity entity = httpResponse.getEntity(); String result = EntityUtils.toString(entity); JSONObject jObject = new JSONObject(result); if(jObject.length()== 0){ returnedUser = null; } else { String firstname = jObject.getString("firstname"); String lastname = jObject.getString("lastname"); int age = jObject.getInt("age"); returnedUser = new User(firstname, lastname, age, user.FirstName, user.LastName, user.Age); } }catch (Exception e){ e.printStackTrace(); } return returnedUser; } @Override protected void onPostExecute(User returnedUser) { progressDialog.dismiss(); userCallback.done(returnedUser); super.onPostExecute(returnedUser); } } }
您可以使用以下使用标准java和android方法的代码
@Override protected Void doInBackground(Void... params) { //Use HashMap, it works similar to NameValuePair Map dataToSend = new HashMap<>(); dataToSend.put("firstname", user.FirstName); dataToSend.put("lastname", user.LastName); dataToSend.put("age", user.Age + ""); dataToSend.put("emailaddress", user.EmailAddress); dataToSend.put("password", user.Password); //Server Communication part - it's relatively long but uses standard methods //Encoded String - we will have to encode string by our custom method (Very easy) String encodedStr = getEncodedData(dataToSend); //Will be used if we want to read some data from server BufferedReader reader = null; //Connection Handling try { //Converting address String to URL URL url = new URL(SERVER_ADDRESS + "Register.php"); //Opening the connection (Not setting or using CONNECTION_TIMEOUT) HttpURLConnection con = (HttpURLConnection) url.openConnection(); //Post Method con.setRequestMethod("POST"); //To enable inputting values using POST method //(Basically, after this we can write the dataToSend to the body of POST method) con.setDoOutput(true); OutputStreamWriter writer = new OutputStreamWriter(con.getOutputStream()); //Writing dataToSend to outputstreamwriter writer.write(encodedStr); //Sending the data to the server - This much is enough to send data to server //But to read the response of the server, you will have to implement the procedure below writer.flush(); //Data Read Procedure - Basically reading the data comming line by line StringBuilder sb = new StringBuilder(); reader = new BufferedReader(new InputStreamReader(con.getInputStream())); String line; while((line = reader.readLine()) != null) { //Read till there is something available sb.append(line + "\n"); //Reading and saving line by line - not all at once } line = sb.toString(); //Saving complete data received in string, you can do it differently //Just check to the values received in Logcat Log.i("custom_check","The values received in the store part are as follows:"); Log.i("custom_check",line); } catch (Exception e) { e.printStackTrace(); } finally { if(reader != null) { try { reader.close(); //Closing the } catch (IOException e) { e.printStackTrace(); } } } //Same return null, but if you want to return the read string (stored in line) //then change the parameters of AsyncTask and return that type, by converting //the string - to say JSON or user in your case return null; }
getEncodedData方法（简单易懂）
private String getEncodedData(Map data) { StringBuilder sb = new StringBuilder(); for(String key : data.keySet()) { String value = null; try { value = URLEncoder.encode(data.get(key),"UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } if(sb.length()>0) sb.append("&"); sb.append(key + "=" + value); } return sb.toString(); }