How to call activity2 after activity1 in kotlin?

Question

I want to execute the login_activity first, then the form_activity like this.

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    // Check Login
    val intent = Intent(this, LoginActivity::class.java)
    startActivity(intent)

    // After login, call FormActivity
    val intent2 = Intent(this, FormActivity::class.java)
    startActivity(intent2)

}

My problem is that if I run this, the app directly opens FormActivity, however, if I comment out the call to FormActivity, then the LoginActivity opens successfully.

What I need is to open the FormActivity only after the LoginActivity returns successfully.

well just put this 2nd intent in the onCreate method of Form Activity — Rizwan Atta, Apr 17 '18 at 15:20
if you are trying to check that if your user is logged in already or not! probably you should read the concept on making sessions using preference storage — Rizwan Atta, Apr 17 '18 at 15:21
Then you need to start the form activity after the login is a success and not immediately. — Srikar Reddy, Apr 17 '18 at 15:25

Krzysztof Kubicki · Answer 1 · 2018-04-17T15:22:40.570

1

You need to startActivityForResult . Read here : https://developer.android.com/training/basics/intents/result.html

A very good example can be found here: How to manage `startActivityForResult` on Android?

edited Apr 17 '18 at 15:22

answered Apr 17 '18 at 15:20

Krzysztof Kubicki

677
8
21

This is the correct answer, but could be more helpful with a small example. – WoogieNoogie Apr 17 '18 at 15:21
1

Added an example link. – Krzysztof Kubicki Apr 17 '18 at 15:23

score 1 · Accepted Answer · answered Apr 17 '18 at 19:03

You should use startActivityForResult(). Compared to startActivity(), startActivityForResult takes an additional integer argument as a request code which identifies your request to the activity. You'll also need to over-ride the onActivityResult() method to handle the called Activity finishing

Example of starting an activity for a result:

static final int MY_REQUEST_CODE = 1;

public void foo(){
    Intent someIntent = new Intent(YOUR_INTENT_HERE); 
    startActivityForResult(someIntent, MY_REQUEST_CODE);
}

Handle the result

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
    if(requestCode == MY_REQUEST_CODE){
        bar();
    }
}

You use the request code as well as the Intent called data to handle whatever data results from launching the other Activity

In Kotlin:

companion object{
    private const val MY_REQUEST_CODE = 1;
}

fun foo(){
    val someIntent = Intent(YOUR_INTENT_HERE)
    startActivityForResult(someIntent, MY_RESULT_CODE)
}

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?){
    if (requestCode == MY_REQUEST_CODE){
        bar()
    }
}

For more info: https://developer.android.com/training/basics/intents/result.html#ReceiveResult

How to call activity2 after activity1 in kotlin?

2 Answers2