CODEWITHSUNDEEP
androidandroid-activity
Alex Mamo
Alex Mamo

Reputation: 1

How to start an activity without calling another activity in Android?

I have 2 activities, LoginActivity and MainActivity. In the first activity i'm logging in the user and redirect him to the MainActivity. I have also have created in the MainActivity a sign-out button which calls this sign-out method:

private void signOut() {
    Auth.GoogleSignInApi.signOut(googleApiClient).setResultCallback(new ResultCallback<Status>() {
        @Override
        public void onResult(Status status) {
            Intent intent = new Intent(MainActivity.this, LoginActivity.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(intent);
        }
    });
}

Every time the app starts, i check if the user in logged in. If it's logged in, the user remains in the MainActivity and if not, it is redirected to the LoginActivity. The problem is, when the user is not logeed in, the app first of all starts the MainActivity and after that it starts the LoginActivity.

This is how my AndroidManifest looks like:

<activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
<activity android:name=".LoginActivity" />

How can i start the app, when the user is not logged in, without opening the MainActivity?

Upvotes: 1

Views: 3240

Answers (3)

Bugs Buggy
Bugs Buggy

Reputation: 1546

I think at best what you can do is have two layouts in MainActivity, say MainLayout and LoginLayout, hide the MainLayout if the user is not logged in, and show LoginLayout in the same Activity, i.e. MainActivity, and make the user login, then again hide the LoginLayout and show the MainLayout. Or, rather than hiding the LoginLayout, restart the Activity.

Put these conditions at the start of onCreate() under if-else statements.

Somewhat like this (in your onCreate of MainActivity):

//Initially, have your LoginLayout GONE and MainLayout VISIBLE
if (!isUserLoggedIn) {
    MainLayout.setVisibility(View.GONE);
    LoginLayout.setVisibility(View.VISIBLE);
    /*
    Code to get user logged in,
    then restart activity, 
    or simply hide LoginLayout and show MainLayout
    */
}

Upvotes: 2

DeeV
DeeV

Reputation: 36045

You create a third Activity which is your true launch activity. Then just this determines which should be the next one.

@Override
public void onCreate(Bundle si) {
   ...
   if (isLoggedIn()) {
      goToMain();
   } else {
      goToLogin();
   }

   finish();
}

This will open up an Activity which decides where to go after. You may see a slight flash on the screen when the Activity loads. Here's a discussion on styling a transparent activity. `

Upvotes: 2

rabhis
rabhis

Reputation: 440

Move the decision making code to a third activity and set it as the new launch activity. 

     if (condition1) {
         startActivity(intent1);
     }
     else {
        startActivity(intent2);
     }

And change the theme of the new activity as below

    android:theme="@android:style/Theme.NoDisplay

Upvotes: 1

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