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我想確保用戶在登錄後仍保持會話狀態，即使在用戶殺死應用程序後也是如此。用戶只有在他/她退出時才能結束會話。如何確保用戶即使在他/她殺了應用程序之後仍保持在會話中？
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);
}
}