How to maintain session in android?

Make one class for your SharedPreferences

public class Session {

    private SharedPreferences prefs;

    public Session(Context cntx) {
        // TODO Auto-generated constructor stub
        prefs = PreferenceManager.getDefaultSharedPreferences(cntx);
    }

    public void setusename(String usename) {
        prefs.edit().putString("usename", usename).commit();
    }

    public String getusename() {
        String usename = prefs.getString("usename","");
        return usename;
    }
}

Now after making this class when you want to use it, use like this: make object of this class like

private Session session;//global variable 
session = new Session(cntx); //in oncreate 
//and now we set sharedpreference then use this like

session.setusename("USERNAME");

now whenever you want to get the username then same work is to be done for session object and call this

session.getusename();

Do same for password

You can achieve this by using AccountManager.

Code Sample

// method to add account..
private void addAccount(String username, String password) {
    AccountManager accnt_manager = AccountManager
            .get(getApplicationContext());

    Account[] accounts = accnt_manager
            .getAccountsByType(getString(R.string.account_type)); // account name identifier.

    if (accounts.length > 0) {
        return;
    }

    final Account account = new Account(username,
            getString(R.string.account_type));

    accnt_manager.addAccountExplicitly(account, password, null);

    final Intent intent = new Intent();
    intent.putExtra(AccountManager.KEY_ACCOUNT_NAME, username);
    intent.putExtra(AccountManager.KEY_PASSWORD, password);
    intent.putExtra(AccountManager.KEY_ACCOUNT_TYPE,
            getString(R.string.account_type));
    // intent.putExtra(AccountManager.KEY_AUTH_TOKEN_LABEL,
    // PARAM_AUTHTOKEN_TYPE);
    intent.putExtra(AccountManager.KEY_AUTHTOKEN, "token");
    this.setAccountAuthenticatorResult(intent.getExtras());
    this.setResult(RESULT_OK, intent);
    this.finish();
}

// method to retrieve account.
private boolean validateAccount() {
    AccountManagerCallback<Bundle> callback = new AccountManagerCallback<Bundle>() {

        @Override
        public void run(AccountManagerFuture<Bundle> arg0) {
            Log.e("calback", "msg");

            try {
                Bundle b = arg0.getResult();
                if (b.getBoolean(AccountManager.KEY_ACCOUNT_MANAGER_RESPONSE)) {
                    //User account exists!!..
                }    
            } catch (OperationCanceledException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (AuthenticatorException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    };

    AccountManager accnt_manager = AccountManager
            .get(getApplicationContext());

    Account[] accounts = accnt_manager
            .getAccountsByType(getString(R.string.account_type));

    if (accounts.length <= 0) {
        return false;
    } else {
        loginNameVal = accounts[0].name;
        loginPswdVal = accnt_manager.getPassword(accounts[0]);
        return true;
    }
}

I have one simple way rather than maintain a session.

i.e. Just store one boolean variable with your username and password. by default set value equal to false.

After first successful login make its value to true.

Then just check its value on your Mainactivity, if it is true then jump to next activity otherwise jump to login activity.

You can use a boolean value in the SharedPreferences.

Load it before login to check if login is needed.

Save it after login.

Use SharedPreferences. Code to save a value to sharedpreferences:

SharedPreferences sp=getSharedPreferences("key", Context.MODE_PRIVATE);
SharedPreferences.Editor ed=sp.edit();
ed.putInt("value", your_value);
ed.commit();

Code to get value from sharedpreferences:

SharedPreferences sp=getSharedPreferences("key", Context.MODE_PRIVATE);
int value = sp.getInt("value", default_value);

You can check login and logout by using this value.