Function onCreate not execute on activity start Kotlin Android

Question

I'm new to Android development and I just started learning.

Here's my problem:

My onCreate function in activity_main works normally, it shows everything. Then he logs in and shows me the second activity and there also the onCreate function works but when I go to the third activity the onCreate function does not execute.

DashboardActivity.kt

class DashboardActivity : AppCompatActivity() {
    @SuppressLint("MissingInflatedId")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_dashboard)
        val policy = ThreadPolicy.Builder().permitAll().build()
        StrictMode.setThreadPolicy(policy)
       sendGet()
       // sendPostRequest()
    }
fun openTest(view: View){
        setContentView(R.layout.activity_test);
    }
}

TestActivity.kt

class TestActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_test)
        println("test")
    }
}

Could someone guide me or explain what and how? I've been sitting on this for a while, searching the inte.net and nothing...

I searched the inte.net, tried solutions, tried to create more activities, turned on debug mode by adding breakpoint and it doesn't even enter this function

Answer 1

To start an Activity, you need to call the following:

startActivity(Intent(this, NextActivity::class.java))

Otherwise, onCreate(Bundle?) will not be called if you do not explicitly call the above.

So in your case, seems that you would like to get to TestActivity in openTest(View) , you should have something like this:

fun openTest(view: View) {
  startActivity(Intent(this, TestActivity::class.java))
  // Calling setContentView() will not trigger another Activity
  // setContentView(R.layout.activity_test);
}