How to start another activity in function? Kotlin-CodePudding

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            val navigate = Intent(this,Activity2::class.java)
            startActivity(navigate)
        }
    }
}

fun switchActivity(){
    val navigate = Intent(this,Activity2::class.java)
    startActivity(navigate)
}

I want to start an activity from a function and not from the main activity.. I can start an activity from main class but in function, the code doesnt work.. Please help.. I'm new to kotlin android programming..

CodePudding user response：

Just use it

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

fun switchActivity(){
    val navigate = Intent(this@MainActivity, Activity2::class.java)
    startActivity(navigate)
}

CodePudding user response：

If your function is declared at the top level, without a reference to this, you'd need to pass an instance of Activity to your function:

fun switchActivity(activity: Activity) {
    val navigate = Intent(activity, Activity2::class.java)
    startActivity(navigate)
}

CodePudding user response：

You can also try like this

    class MainActivity : AppCompatActivity() {
    @SuppressLint("MissingInflatedId")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        
        nextActivity(this, MainActivity2())
    }


    private fun nextActivity(context: Context, activity: Activity) {
        startActivity(Intent(context, activity::class.java))
    }
}

CodePudding user response：

Actually i don't get your question clearly. But i'll try to answer your question based on my understanding of yours.

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            switchActivity()
            // if you want to pass the class through the paramater,
            // can try this
            // TODO: Another Way
            // switchActivityCustom(Activity2::class.java)
        }
    }

    fun switchActivity(){
        val navigate = Intent(this, Activity2::class.java)
        startActivity(navigate)
    }

    // TODO: Another Function
    // fun switchActivityCustom(destination: Class<*>,){
    //    val navigate = Intent(this, destination)
    //    startActivity(navigate)
    // }
}

And the last one is, put your function inside the class (in this case: MainActivity Class)