Call Activity Method from Fragment: RRutors Guide
How to use Activity method in Fragment, Will learn how to call Activity from from Fragment with Android kotlin
Published February 16, 2020
This post demonstrates how to call an activity method from fragment in android
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="https://schemas.android.com/apk/res/android"
xmlns:tools="https://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="8dp"
tools:context=".MainActivity">
<FrameLayout
android:id="@+id/frameLayout"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
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Step 3 − Add the following code to MainActivity.kt
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var fragmentManager = getSupportFragmentManager();
var fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.frameLayout, SampleFragment()).commit();
}
public fun fragmentMethod() {
Toast.makeText(this@MainActivity, "Method called From Fragment", Toast.LENGTH_LONG).show();
}
}
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Step 4: Create New Fragment and update below code
SampleFragment.kt
class SampleFragment : Fragment() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
arguments?.let {
}
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_sample, container, false)
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
btnClick.setOnClickListener(object:View.OnClickListener{
override fun onClick(v: View?) {
(activity as MainActivity).fragmentMethod()
}
})
}
}
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fragment_sample.xml
<FrameLayout xmlns:android="https://schemas.android.com/apk/res/android"
xmlns:tools="https://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".SampleFragment">
<!-- TODO: Update blank fragment layout -->
<Button
android:id="@+id/btnClick"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_gravity="center"
android:background="@color/colorPrimary"
android:textColor="#FFF"
android:textAllCaps="false"
android:minEms="8"
android:text="Call Method"/>
</FrameLayout>
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Step 5: Let's run the application
