Skip to content
Related Articles

Related Articles

Improve Article

How to Send Data From Activity to Fragment in Android?

  • Last Updated : 11 Aug, 2021
Geek Week

Prerequisites:

In Android, a fragment is a portion of the user interface that can be used again and again. Fragment manages its own layout and has its own life cycle. Since fragment is a small portion of the bigger user interface, it can only be initialized inside an activity or another fragment. So if we wish to display any type of resources, such as a string, or an image inside the fragment, we will need to declare them in the activity and then pass it to the fragment. So in this article, we will show you how you can pass data from an Activity to the Fragment.

Step by Step Implementation

Step 1: Create a New Project in Android Studio

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. We demonstrated the application in Kotlin, so make sure you select Kotlin as the primary language while creating a New Project.

Step 2: Create a custom fragment layout (my_custom_fragment.xml) in the layout folder



We shall pass a string to the fragment. To display this string, we implemented a TextView.

XML




<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">
  
    <!-- TextVIew to display the passed text -->
    <TextView
        android:id="@+id/fragmentTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:textColor="@color/white"
        android:textSize="50sp"
        android:background="#0f9d58"/>
  
</LinearLayout>

Step 3: Add EditText, Button, and Frame in the layout file (activity_main.xml)

Refer to the comments inside the code for better understanding.

XML




<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
  
    <!-- We will type text in this EditText -->
    <EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="50sp"/>
  
    <!-- Click this button to pass text 
         in EditText to the Fragment -->
    <Button
        android:id="@+id/button"
        android:layout_below="@+id/editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:text="Pass"/>
  
    <!-- Text will be displayed in a
          TextView in this Fragment -->
    <FrameLayout
        android:id="@+id/frameLayout"
        android:layout_below="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
  
</RelativeLayout>

Step 4: Create a class for the custom fragment (MyCustomFragment.kt)

This is a custom fragment class to inflate the custom layout in the frame layout present in the main activity.

Kotlin




import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.fragment.app.Fragment
  
class MyCustomFragment: Fragment() {
  
    // Declaring TextView fro the custom fragment layout
    private lateinit var myTextView: TextView
  
    // Override function when the view is being created
    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
  
        // Inflates the custom fragment layout
        val view: View = inflater.inflate(R.layout.my_custom_fragment, container, false)
  
        // Finds the TextView in the custom fragment
        myTextView = view.findViewById<View>(R.id.fragmentTextView) as TextView
  
        // Gets the data from the passed bundle
        val bundle = arguments
        val message = bundle!!.getString("mText")
  
        // Sets the derived data (type String) in the TextView
        myTextView.text = message
  
        return view
    }
}

Step 5: Initialize MyCustomFragment class and pass the values from the EditText (MainActivity.kt)

In this program, the EditText value (input string) is fetched on a button click. The custom fragment class is initialized and the input string is passed to get desired results. Please refer to the comments inside the code below for a better understanding.

Kotlin




import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.EditText
  
class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
  
        // Declaring and initializing the EditText and Button from the layout
        val mEditText = findViewById<EditText>(R.id.editText)
        val mButton = findViewById<Button>(R.id.button)
  
        // Declaring fragment manager from making data
        // transactions using the custom fragment
        val mFragmentManager = supportFragmentManager
        val mFragmentTransaction = mFragmentManager.beginTransaction()
        val mFragment = MyCustomFragment()
  
        // On button click, a bundle is initialized and the 
        // text from the EditText is passed in the custom
        // fragment using this bundle
        mButton.setOnClickListener {
            val mBundle = Bundle()
            mBundle.putString("mText",mEditText.text.toString())
            mFragment.arguments = mBundle
            mFragmentTransaction.add(R.id.frameLayout, mFragment).commit()
        }
    }
}

Output:

We can see that when the text is typed in the EditText and the button is clicked, the same text is displayed in our custom fragment.

Want a more fast-paced & competitive environment to learn the fundamentals of Android?
Click here to head to a guide uniquely curated by our experts with the aim to make you industry ready in no time!



My Personal Notes arrow_drop_up
Recommended Articles
Page :