是否有一种方法可以将MySQL服务器数据库中的数据显示在android的列表视图中，具体取决于登录应用程序的用户的会话。数据将根据用户的user_id进行排序。
这可能是Login.java
public class Displayloginpage extends Activity {
Button loginbutton;
EditText usernameedittext,passwordedittext;
TextView tv, forgot;
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
List<NameValuePair> nameValuePairs;
ProgressDialog dialog = null;
// Session Manager Class
SessionManager session;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.displaylogin);
// Session Manager
session = new SessionManager(getApplicationContext());
loginbutton = (Button)findViewById(R.id.loginbtn);
usernameedittext = (EditText)findViewById(R.id.usernameet);
passwordedittext= (EditText)findViewById(R.id.passwordet);
tv = (TextView)findViewById(R.id.tv);
forgot = (TextView) findViewById(R.id.forgottext);
forgot.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
alert();
}
});
loginbutton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
dialog = ProgressDialog.show(Displayloginpage.this, "",
"Validating user...", true);
new Thread(new Runnable() {
public void run() {
login();
}
}).start();
}
});
}
@SuppressWarnings("deprecation")
public void alert() {
AlertDialog alertDialog = new AlertDialog.Builder(
Displayloginpage.this).create();
// Setting Dialog Title
alertDialog.setTitle("Forget Username/Password");
// Setting Dialog Message
alertDialog.setMessage("Please Contact Your School Administrator");
// Setting Icon to Dialog
alertDialog.setIcon(R.drawable.fail);
// Setting OK Button
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
}
});
// Showing Alert Message
alertDialog.show();
}
void login(){
try{
httpclient=new DefaultHttpClient();
httppost= new HttpPost("http://192.168.1.100:80/ihatid/android/Attender/login_user.php");
//add your data
nameValuePairs = new ArrayList<NameValuePair>();
// Always use the same variable name for posting i.e the android side variable name and php side variable name should be similar,
nameValuePairs.add(new BasicNameValuePair("username",usernameedittext.getText().toString().trim()));
nameValuePairs.add(new BasicNameValuePair("password",passwordedittext.getText().toString().trim()));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
//Execute HTTP Post Request
response=httpclient.execute(httppost);
ResponseHandler<String> responseHandler = new BasicResponseHandler();
final String response = httpclient.execute(httppost, responseHandler);
System.out.println("Response : " + response);
runOnUiThread(new Runnable() {
public void run() {
tv.setText("Response from PHP : " + response);
dialog.dismiss();
}
});
if(response.equalsIgnoreCase("User Found")){
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(Displayloginpage.this,"Login Success", Toast.LENGTH_SHORT).show();
String username = usernameedittext.getText().toString();
String password = passwordedittext.getText().toString();
session.createLoginSession(username, password);
}
});
Displayloginpage.this.finish();
Intent loginintent = new Intent(getApplicationContext(), DrawerMainActivity.class);
startActivity(loginintent);
}else{
showAlert();
}
}catch(Exception e){
dialog.dismiss();
System.out.println("Exception : " + e.getMessage());
}
}
public void showAlert(){
Displayloginpage.this.runOnUiThread(new Runnable() {
public void run() {
AlertDialog.Builder builder = new AlertDialog.Builder(Displayloginpage.this);
builder.setTitle("Login Error.");
builder.setMessage("User not Found.")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
AlertDialog alert = builder.create();
alert.show();
}
});
}
}
这可能是main.java
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1) @SuppressLint("NewApi") public class Main extends Fragment {
public Main(){
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.main, container, false);
new GetUser().execute();
return rootView;
}
class GetUser extends AsyncTask<String, String, String> {
//private ProgressDialog pDialog;
//String row_id = "1";
String result=null;
InputStream is=null;
String line=null;
String user = "user";
/**
* Before starting background thread Show Progress Dialog
* */
/*
@Override
protected void onPreExecute() {
super.onPreExecute();
Fragment myProfileFragment = null;
pDialog = new ProgressDialog(this);
pDialog.setMessage("Loading recipe profile. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* After completing background task Dismiss the progress dialog
* **/
/*
protected void onPostExecute(String file_url) {
// dismiss the dialog once got all details
pDialog.dismiss();
}
*/
/**
* Getting product details in background thread
* */
@Override
public String doInBackground(String... arg0) {
// updating UI from Background Thread
//String returnName, returnIngr, returnProc;
runOnUiThread(new Runnable() {
public void run() {
// Check for success tag
//int success;
String id = "1";
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("username",id));
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://192.168.1.100:80/ihatid/android/Attender/getattenderuser.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
Log.e("pass 1", " connection success ");
}
catch(Exception e) {
Log.e("Fail 1", e.toString());
}
try {
BufferedReader reader = new BufferedReader
(new InputStreamReader(is,"iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
while((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
is.close();
result=sb.toString();
//Toast shit = Toast.makeText(MyProfileFragment.this, result, Toast.LENGTH_LONG);
//shit.show();
Log.e("pass 2", " connection success ");
}
catch(Exception e){
Log.e("Fail 2", e.toString());
}
try {
JSONObject json_data = new JSONObject(result);
Log.d("User details",json_data.toString());
int code;
code=1;
JSONArray userObj = json_data.getJSONArray("user");
if(code==1) {
String up_name = "schoolname";
String up_add = "name";
String up_eadd = "licenseno";
for (int i = 0; i < userObj.length(); i++) {
JSONObject getrecipe = userObj.getJSONObject(i);
TextView txtName = (TextView) getView().findViewById(R.id.register);
TextView txtAdd = (TextView) getView().findViewById(R.id.name);
TextView txtEAdd = (TextView) getView().findViewById(R.id.license);
txtName.setText(getrecipe.getString(up_name));
txtAdd.setText(getrecipe.getString(up_add));
txtEAdd.setText(getrecipe.getString(up_eadd));
}
}
else if(code==0){
//Toast toast = Toast.makeText(MyProfileFragment.this, "Error: code is equal to 0", Toast.LENGTH_LONG);
//toast.show();
}
}catch(Exception e) {
Log.e("Fail 3", e.toString());
//e.printStackTrace();
}
}
});
return null;
}
private void runOnUiThread(Runnable runnable) {
// TODO Auto-generated method stub
}
}
}
这是我的会议。
public class SessionManager {
// Shared Preferences
SharedPreferences pref;
// Editor for Shared preferences
Editor editor;
// Context
Context _context;
// Shared pref mode
int PRIVATE_MODE = 0;
// Sharedpref file name
private static final String PREF_NAME = "AndroidHivePref";
// All Shared Preferences Keys
private static final String IS_LOGIN = "IsLoggedIn";
// User name (make variable public to access from outside)
public static final String KEY_EMAIL = "username";
// Email address (make variable public to access from outside)
public static final String KEY_PASSWORD = "password";
// Constructor
@SuppressLint("CommitPrefEdits")
public SessionManager(Context context){
this._context = context;
pref = _context.getSharedPreferences(PREF_NAME, PRIVATE_MODE);
editor = pref.edit();
}
/**
* Create login session
* */
public void createLoginSession(String username, String password){
// Storing login value as TRUE
editor.putBoolean(IS_LOGIN, true);
// Storing name in pref
editor.putString(KEY_EMAIL, username);
// Storing email in pref
editor.putString(KEY_PASSWORD, password);
// commit changes
editor.commit();
}
/**
* Check login method wil check user login status
* If false it will redirect user to login page
* Else won't do anything
* */
public void checkLogin(){
// Check login status
if(!this.isLoggedIn()){
// user is not logged in redirect him to Login Activity
Intent i = new Intent(_context, Displayloginpage.class);
// Closing all the Activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// Add new Flag to start new Activity
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// Staring Login Activity
_context.startActivity(i);
}
}
/**
* Get stored session data
* */
public HashMap<String, String> getUserDetails(){
HashMap<String, String> user = new HashMap<String, String>();
// user name
user.put(KEY_EMAIL, pref.getString(KEY_EMAIL, null));
// user email id
user.put(KEY_PASSWORD, pref.getString(KEY_PASSWORD, null));
// return user
return user;
}
/**
* Clear session details
* */
public void logoutUser(){
// Clearing all data from Shared Preferences
editor.clear();
editor.commit();
// After logout redirect user to Loing Activity
Intent i = new Intent(_context, Displayloginpage.class);
// Closing all the Activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// Add new Flag to start new Activity
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// Staring Login Activity
_context.startActivity(i);
}
/**
* Quick check for login
* **/
// Get Login State
public boolean isLoggedIn(){
return pref.getBoolean(IS_LOGIN, false);
}
}
my liistvier.java
public class Listattendance extends ListActivity {
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> studentList;
SessionManager session;
// url to get all products list
private static String url_all_student = "http://192.168.1.101:80/ihatid/android/attender/allstudent.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_STUDENT = "student";
private static final String TAG_SNO = "studentno";
private static final String TAG_NAME = "name";
private static final String TAG_LAT = "latitude";
private static final String TAG_LONG = "longitude";
// products JSONArray
JSONArray students = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listattendance);
session = new SessionManager(getApplicationContext());
session.checkLogin();
// Hashmap for ListView
studentList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
// Get listview
//ListView lv = getListView();
//lv.setOnItemClickListener(new OnItemClickListener() {
//@Override
//public void onItemClick(AdapterView<?> parent, View view,
// int position, long id) {
// getting values from selected ListItem
//String sno = ((TextView) view.findViewById(R.id.studentno)).getText().toString();
//String names = ((TextView) view.findViewById(R.id.name)).getText().toString();
// Starting new intent
//Intent in = new Intent(getApplicationContext(), .class);
// sending pid to next activity
//in.putExtra(TAG_SNO, sno);
//in.putExtra(TAG_NAME, names);
// starting new activity and expecting some response back
//startActivity(in);
// }
//});
new LoadAllstudents().execute();
}
// Response from Edit Product Activity
//@Override
//protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// super.onActivityResult(requestCode, resultCode, data);
// if result code 100
// if (resultCode == 100) {
// if result code 100 is received
// means user edited/deleted product
// reload this screen again
// Intent intent = getIntent();
// finish();
// startActivity(intent);
// }
//}
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadAllstudents extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Listattendance.this);
pDialog.setMessage("Loading Students. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_student, "GET", params);
// Check your log cat for JSON reponse
Log.d("All Student: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
students = json.getJSONArray(TAG_STUDENT);
// looping through All Products
for (int i = 0; i < students.length(); i++) {
JSONObject c = students.getJSONObject(i);
// Storing each json item in variable
//String studentid = c.getString(TAG_SNO);
String name = c.getString(TAG_NAME);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
//map.put(TAG_SNO, studentid);
map.put(TAG_NAME, name);
// adding HashList to ArrayList
studentList.add(map);
}
} else {
Toast.makeText(Listattendance.this, "No student found", Toast.LENGTH_LONG).show();
// no products found
// Launch Add New product Activity
//Intent i = new Intent(getApplicationContext(),
// NewProductActivity.class);
// Closing all previous activities
// i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// startActivity(i);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
Listattendance.this, studentList,
R.layout.listview_item, new String[] {
TAG_NAME },
new int[] { R.id.name });
// updating listview
setListAdapter(adapter);
}
});
}
}
}
用户登录后。我想要的是在main.java上显示用户信息。顺便说一句，我在我的Android应用程序中使用抽屉导航。然后，当我单击listActivity按钮时，这将指向xml，它将从数据库中显示listview中的数据。
我的问题是我不知道如何显示用户信息并根据用户的会话显示数据。请求请求...提前感谢...我只是一个初学者...
我的php文件...这是用于获取用户数据
$response = array();
require_once $_SERVER['DOCUMENT_ROOT'] .'/ihatid/android/Connection/connection.php';
$db = new DB_CONNECT();
$username = $_POST['username'];
$password = $_POST['password'];
// get all products from products table
$result = mysql_query("select a.ATTENDER_NO AS ATTENDERNO,CONCAT(a.FIRSTNAME ',' a.MIDDLENAME ',
' a.LASTNAME) AS NAME, a.LICENSE_NO, s.SCHOOLNAME, a.LICENSE_NO,
s.SCHOOLNAME AS SCHOOLNAME, s.SCHOOL_ID from
attender a, school_admin s, vehicle v, vehicle_sched b
where a.ATTENDER_NO = b.ATTENDER_NO
AND v.PLATE_NO = b.PLATE_NO
AND s.SCHOOL_ID = v.SCHOOL_ID
AND a.USERNAME = '$username'
AND a.PASSWORD = '$password'") or die(mysql_error());
// check for empty result
if (mysql_num_rows($result) > 0) {
// looping through all results
// products node
$response["attender"] = array();
while ($row = mysql_fetch_array($result)) {
// temp user array
$attender = array();
$attender["schoolname"]= $row["SCHOOLNAME"];
$attender["attenderno"]= $row["ATTENDERNO"];
$attender["name"] = $row["NAME"];
$attender["licenseno"] = $row["LICENSE_NO"];
// push single product into final response array
array_push($response["attender"], $attender);
}
// success
$response["success"] = 1;
// echoing JSON response
echo json_encode($response);
} else {
// no products found
$response["success"] = 0;
$response["message"] = "No attender/s found";
// echo no users JSON
echo json_encode($response);
}
?>
这是用于登录的php
<?php
//Login code details
$reponse = array();
require_once $_SERVER['DOCUMENT_ROOT'] .'/ihatid/android/Connection/connection.php';
$db = new DB_CONNECT();
$username = $_POST['username'];
$password = $_POST['password'];
// get user name from users table
$result = mysql_query("SELECT ATTENDER_NO FROM attender where USERNAME = '$username' && PASSWORD = '$password'") or die(mysql_error());
// check for empty result
if (mysql_num_rows($result) > 0) {
echo "User Found";
} else {
// user name and or password is incorrect
// invalid login
echo "User not Found";
}
?>
这是用于在列表视图中显示数据
<?php
$response = array();
require_once $_SERVER['DOCUMENT_ROOT'] .'/ihatid/android/Connection/connection.php';
$db = new DB_CONNECT();
$username = $_GET["name"];
$password = $_GET["email"];
// get all products from products table
$result = mysql_query("SELECT student.STUDENT_NO, student.FIRSTNAME,
vehicle.PLATE_NO, CONCAT(attender.FIRSTNAME , attender.MIDDLENAME, attender.LASTNAME) AS NAME,
parent.FIRSTNAME, parent.LATITUDE AS LATITUDE, parent.LONGITUDE AS LONGITUDE
FROM student, vehicle, vehicle_sched, attender, student_has_parent, parent
WHERE student.PLATE_NO = vehicle.PLATE_NO
AND vehicle.PLATE_NO = vehicle_sched.PLATE_NO
AND vehicle_sched.ATTENDER_NO = attender.ATTENDER_NO
AND student.STUDENT_NO = student_has_parent.STUDENT_NO
AND student_has_parent.PARENT_NO = parent.PARENT_NO
AND attender.FIRSTNAME = '$usename'
AND student.ENROLL_STATUS = 'active'") or die(mysql_error());
// check for empty result
if (mysql_num_rows($result) > 0) {
// looping through all results
// products node
$response["student"] = array();
while ($row = mysql_fetch_array($result)) {
// temp user array
$student = array();
$student["studentno"]= $row["STUDENT_NO"];
$student["name"] = $row["NAME"];
$student["latitude"] = $row["LATITUDE"];
$student["longitude"] = $row["LONGITUDE"];
// push single product into final response array
array_push($response["student"], $student);
}
// success
$response["success"] = 1;
// echoing JSON response
echo json_encode($response);
} else {
// no products found
$response["success"] = 0;
$response["message"] = "No student/s found";
// echo no users JSON
echo json_encode($response);
}
?>
答案 0 :(得分：0)
实施此步骤有几个步骤。我不打算详细描述如何实施这些步骤 - 我只想向您概述您应该/需要做什么。
我看到你正在使用JSON，这很棒。但是，您应该创建一个名为Student的类，并将相同的字段添加到您的JSON中。然后，您应该使用JSON数据填充每个学生对象。
这样做会让您的生活变得更轻松 - 您所做的任何拼写错误都会导致编译错误，并且您的代码将更易于维护。
获得Student个对象的ArrayList后，您需要创建ArrayAdapter。 Android为ListViews广泛使用ArrayAdapter类;在继续之前，你一定要很好地理解它们的工作原理。
我强烈建议您按照本教程进行操作：http://www.vogella.com/tutorials/AndroidListView/article.html
完成ArrayAdapter设置后，可以非常轻松地更新ListView的数据。只需致电notifyDataSetChanged()。