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我在android studio（toni kami教程）上登錄/註冊了一個教程，我完成了他所做的一切，但httpclient/httpparams方法不再適用於android studio，即時通訊新的應用程序編程，所以我搜索互聯網的方式來解決這個問題，我發現了一個url連接代碼，我複製它，但它不工作。網絡主機上的外部數據庫連接不工作
******這是所有的java類****** ****** ------幫我糾正這個問題或給我一個新的想法來解決它------ 當我運行應用程序，我得到這樣的：
package com.thenewboston.loginr;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.util.Log;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
/**
* Created by sleeman on 1/1/16.
*/
public class ServerRequests {
ProgressDialog progressDialog;
public static final int CONNECTION_TIMEOUT = 1000 * 15;
public static final String SERVER_ADDRESS = "http://sleemanb94.tk/";
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<Void, Void, Void>{
User user;
getUserCallBack userCallback;
public StoreUserDataAsyncTask(User user, getUserCallBack userCallback){
this.user = user;
this.userCallback = userCallback;
}
@Override
protected Void doInBackground(Void... params) {
Map<String,String> dataToSend = new HashMap<>();
dataToSend.put("fname", user.fname);
dataToSend.put("lname", user.lname);
dataToSend.put("email", user.email);
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();
}
}
}
return null;
}
private String getEncodedData(Map<String,String> 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();
}
@Override
protected void onPostExecute(Void aVoid) {
progressDialog.dismiss();
userCallback.done(null);
super.onPostExecute(aVoid);
}
}
public class fetchUserDataAsyncTask extends AsyncTask<Void, Void, User> {
User user;
getUserCallBack userCallback;
public fetchUserDataAsyncTask(User user, getUserCallBack userCallback) {
this.user = user;
this.userCallback = userCallback;
}
@Override
protected User doInBackground(Void... params) {
//Use HashMap, it works similar to NameValuePair
Map<String, String> dataToSend = new HashMap<>();
dataToSend.put("email", user.email);
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
User returnedUser = null;
try {
//Converting address String to URL
URL url = new URL(SERVER_ADDRESS + "FetchUserData.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);
returnedUser = new User(user.fname, user.lname);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close(); //Closing the
} catch (IOException e) {
e.printStackTrace();
}
}
}
return returnedUser;
}
@Override
protected void onPostExecute(User returnedUser) {
progressDialog.dismiss();
userCallback.done(returnedUser);
super.onPostExecute(returnedUser);
}
private String getEncodedData(Map<String, String> 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();
}
}
}
任何有錯誤或什麼？讓我們看看關於你試用的更多信息 –
即時消息應用程序編程，我從youtube上的教程複製代碼，但與Web主機（有數據庫）的連接方法（httpclient）不再工作，谷歌和Android決定阻止該方法，所以我複製了一個url連接代碼，但它不工作，我在這裏發佈了所有的代碼，我希望你看看它，並診斷問題，也許是它的一個小問題。 –
也許這個教程可以幫助你http://www.vogella.com/tutorials/AndroidJSON/article.html#json_android –