Starting another activity in onCreate()?

Question

In my app, I have an entry activity (dummy, without layout) which checks the accounts in the account manager:

• If there exist an account of certain type: start the main activity
• Else, start an activity for getting the user credentials (to add it to accounts)

Here's the code in the EntryActivity :

public class EntryActivity extends Activity {

// Tag
private String TAG = getClass().getSimpleName();

// Inst.
private AccountManager accountManager;
private Account[] accounts;
private Authenticator authenticator;

@Override
public void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 

    authenticator = new Authenticator(this);

    // Check for the account in account manager
    accountManager = AccountManager.get(this);

    accounts = accountManager.getAccountsByType(HConstants.ACCOUNT_TYPE);
    int nAccounts = accounts.length;

    if(nAccounts!=0){
        // There's an account

    }
    else{
        // Prompt user to enter creds
        final Intent intent = new Intent(this, AuthenticationActivity.class);
        startActivity(intent);
    }

}

The problem is, I can't start the AuthenticationActivity and I get this error:

java.lang.IllegalStateException: System services not available to Activities before onCreate()

How can I resolve this?

---

Update: Code for AuthenticationActivity :

public class AuthenticationActivity extends Activity {


// Instances
AccountManager accountManager = AccountManager.get(this);

// Values for email and password at the time of the login attempt.
private String mEmail;
private String mPassword;

// UI references.
private EditText mEmailView;
private EditText mPasswordView;
private View mLoginFormView;
private View mLoginStatusView;
private TextView mLoginStatusMessageView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.authentication_activity);

    // Set up the login form.
    mEmailView = (EditText) findViewById(R.id.email);
    mEmailView.setText(mEmail);

    mPasswordView = (EditText) findViewById(R.id.password);

    mLoginFormView = findViewById(R.id.login_form);
    mLoginStatusView = findViewById(R.id.login_status);
    mLoginStatusMessageView = (TextView) findViewById(R.id.login_status_message);

}

Answer 1

Put your check into onStart() instead of onCreate() . After starting the other activity, call finish() to stop your dummy activity.

Answer 2

Try using onResume() method. If this does not work directly try the following code (I don't fully recommend this):

new Handler().postDelayed(new Runnable(){
   public void run(){
      //Start your activity..
   }
}

This code inside your onResume

Answer 3

I guess the problem is in this line:

private String TAG = getClass().getSimpleName();

Try to move it into the onCreate method after the super . Hope this helps.

Answer 4

The problem was in this line:

AccountManager accountManager = AccountManager.get(this);

I was using the context (system service) before onCreate() . By putting it inside the method, the error was resolved.