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Ich möchte sicherstellen, dass der Benutzer nach dem Anmelden in der Sitzung bleibt, selbst nachdem der Benutzer die Anwendung beendet hat. Der Benutzer kann die Sitzung nur beenden, wenn er sich abmeldet.Wie kann sichergestellt werden, dass der Benutzer auch nach dem Beenden der Anwendung in der Sitzung bleibt?
Login.java`
public class Login extends AppCompatActivity {
EditText loginEmail, loginPassword;
Button loginButton, registerButton;
UserSessionManager session;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
//User Session Manager
session = new UserSessionManager(getApplicationContext());
loginEmail = (EditText) findViewById(R.id.login_email);
loginPassword = (EditText) findViewById(R.id.login_password);
loginButton = (Button) findViewById(R.id.login);
registerButton = (Button) findViewById(R.id.register);
Toast.makeText(getApplicationContext(),
"User Login Status: " + session.isUserLoggedIn(),
Toast.LENGTH_LONG).show();
}
public void OnLogin(View view){
String email = loginEmail.getText().toString();
String password = loginPassword.getText().toString();
String type = "login";
BackgroundWorker backgroundWorker = new BackgroundWorker(this);
backgroundWorker.execute(type, email, password);
UserSessionManager userSessionManager = new UserSessionManager(this);
userSessionManager.createUserLoginSession(type, email);
}
public void OpenReg(View view){
startActivity(new Intent(this, Register.class));
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
//User Session Manager
UserSessionManager session;
Button btnLogout;
private static ImageButton profile_button1;
private static TextView profile_button2;
private static ImageButton link_button1;
private static TextView link_button2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
OnClickButtonListener();
//Session class instance
session = new UserSessionManager(getApplicationContext());
TextView loginEmail = (TextView) findViewById(R.id.login_email);
TextView loginPassword = (TextView) findViewById(R.id.login_password);
//Logout
btnLogout = (Button) findViewById(R.id.btnLogout);
Toast.makeText(getApplicationContext(), "User Login Status: " + session.isUserLoggedIn(),
Toast.LENGTH_LONG).show();
//check user login
if (session.checkLogin())
finish();
//get user data
HashMap<String, String> user = session.getUserDetails();
//get email
String email = user.get(UserSessionManager.KEY_EMAIL);
btnLogout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
session.logoutUser();
}
});
}
public void OnClickButtonListener() {
profile_button1 = (ImageButton) findViewById(R.id.ProfileButton);
profile_button2 = (TextView) findViewById(R.id.Profile);
link_button1 = (ImageButton) findViewById(R.id.LinkButton);
link_button2 = (TextView) findViewById(R.id.link);
profile_button1.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent("com.imedimate.imedimate.Profile");
startActivity(intent);
}
}
);
profile_button2.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent("com.imedimate.imedimate.Profile");
startActivity(intent);
}
}
);
link_button1.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Uri uri = Uri.parse("http://www.imedimate.com"); // missing 'http://' will cause crashed
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
}
}
);
link_button2.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Uri uri = Uri.parse("http://www.imedimate.com"); // missing 'http://' will cause crashed
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
}
}
);
}
}
UserSessionManager.java
public class UserSessionManager {
//Shared preferences reference
SharedPreferences pref;
//Editor reference for shared preferences
SharedPreferences.Editor editor;
//Context
Context _context;
//shared pref mode
int PRIVATE_MODE = 0;
//sharedpref file name
private static final String PREFER_NAME = "AndroidExamplePref";
//All Shared Preferences Keys
private static final String IS_USER_LOGIN = "IsUserLoggedIn";
//email
public static final String KEY_EMAIL = "email";
//constructor
public UserSessionManager(Context context){
this._context = context;
pref = _context.getSharedPreferences(PREFER_NAME, PRIVATE_MODE);
editor = pref.edit();
}
//create login session
public void createUserLoginSession(String name, String email){
//store login value as TRUE
editor.putBoolean(IS_USER_LOGIN, true);
//store email in pref
editor.putString(KEY_EMAIL, email);
//commit changes
editor.commit();
}
/**
* check login method will check user status
* If false it will redirect user to login page
* Else do anything
*/
public boolean checkLogin(){
//check login status
if (!this.isUserLoggedIn()){
//user is not logged in, redirected to login
Intent i = new Intent(_context, Login.class);
//closing all activities from stack
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
//add new flag to start new activity
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//staring login activity
_context.startActivity(i);
return true;
}
return false;
}
/**
* Get stored session data
*/
public HashMap<String, String> getUserDetails(){
//Use hashmap to store user credentials
HashMap<String, String> user = new HashMap<String, String>();
//user name
user.put(KEY_EMAIL, pref.getString(KEY_EMAIL, null));
//return email
return user;
}
/**
* Clear session details
*/
public void logoutUser(){
//clearing all user data from shared preferences
editor.clear();
editor.commit();
//After logout redirecr user to login
Intent i = new Intent(_context, Login.class);
//close all activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
//add new flag to start new activity
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//staring login
_context.startActivity(i);
}
//check for login
public boolean isUserLoggedIn(){
return pref.getBoolean(IS_USER_LOGIN, false);
}
}
BackgroundWorker.java
public class BackgroundWorker extends AsyncTask<String,Void,String> {
Context context;
AlertDialog alertDialog;
BackgroundWorker (Context ctx){
context = ctx;
}
@Override
protected String doInBackground(String... params) {
String type = params[0];
String login_url = "http://imedimate.com/app/login.php";
String register_url = "http://imedimate.com/app/register.php";
if (type.equals("login")){
try {
String email = params[1];
String password = params[2];
URL url = new URL(login_url);
HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String post_data = URLEncoder.encode("email","UTF-8")+"="+URLEncoder.encode(email,"UTF-8")+"&"
+URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(password,"UTF-8");
bufferedWriter.write(post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
String result = "";
String line = "";
while ((line = bufferedReader.readLine()) != null) {
result += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} else if (type.equals("register")){
try {
String regEmail = params[1];
String regPassword = params[2];
URL url = new URL(register_url);
HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String post_data = URLEncoder.encode("email","UTF-8")+"="+URLEncoder.encode(regEmail,"UTF-8")+"&"
+URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(regPassword,"UTF-8");
bufferedWriter.write(post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
String result = "";
String line = "";
while ((line = bufferedReader.readLine()) != null) {
result += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onPreExecute() {
alertDialog = new AlertDialog.Builder(context).create();
alertDialog.setTitle("Status");
}
@Override
protected void onPostExecute(String result) {
alertDialog.setMessage(result);
if (result.contains("success")) {
Intent intent = new Intent(context, MainActivity.class);
context.startActivity(intent);
} else {
alertDialog.show();
}
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
}