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Send data from one Fragment to another using Kotlin?
This example demonstrates how to send data from one Fragment to another using Kotlin.
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="http://schemas.android.com/apk/res/android" android:id="@+id/relativeLayout" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="8dp"> </RelativeLayout>
Step 3 − Create two FragmentActivity and add the codes which are given below.
fragmentOne.xml −
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" android:padding="8dp"> <EditText android:id="@+id/editText" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="50dp" android:hint="Enter your message" android:textColorHint="@android:color/background_dark" android:textSize="16sp" android:textStyle="bold" /> <Button android:id="@+id/btnSend" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@android:color/holo_blue_dark" android:padding="10dp" android:text="Send Message" android:textColor="@android:color/white" android:textStyle="bold" /> </LinearLayout>
FirstFragment.kt −
import android.os.Bundle import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import androidx.fragment.app.Fragment import kotlinx.android.synthetic.main.fragment_one.view.* class FirstFragment : Fragment() { private lateinit var communicator: Communicator override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { val rootView = inflater.inflate(R.layout.fragment_one, container, false) as ViewGroup communicator = activity as Communicator rootView.btnSend.setOnClickListener { communicator.passData(rootView.editText.text.toString()) } return rootView } }
fragmentTwo.xml −
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical"> <TextView android:id="@+id/outPutTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:textColor="@android:color/background_dark" android:textSize="24sp" android:textStyle="bold" /> </LinearLayout>
FragmentTwo.kt −
import android.os.Bundle import androidx.fragment.app.Fragment import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import kotlinx.android.synthetic.main.fragment_two.view.* class FragmentTwo : Fragment() { var inputText: String? = "" override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { val rootView = inflater.inflate(R.layout.fragment_two, container, false) inputText = arguments?.getString("inputText") rootView.outPutTextView.text = inputText return rootView } }
Step 4 − Add the following code to src/MainActivity.kt
import android.os.Bundle import androidx.appcompat.app.AppCompatActivity import androidx.fragment.app.FragmentTransaction class MainActivity : AppCompatActivity(), Communicator { public override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val firstFragment = FirstFragment() supportFragmentManager.beginTransaction().replace(R.id.relativeLayout, firstFragment) .commit() } override fun passData(editTextInput: String) { val bundle = Bundle() bundle.putString("inputText", editTextInput) val transaction = this.supportFragmentManager.beginTransaction() val fragmentTwo = FragmentTwo() fragmentTwo.arguments = bundle transaction.replace(R.id.relativeLayout, fragmentTwo) transaction.addToBackStack(null) transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE) transaction.commit() } }
Step 5 − Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.kotlipapp"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /&g; <category android:name="android.intent.category.LAUNCHER" /> </intent-filter&g; </activity> </application> </manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
Click here to download the project code.
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