Fragment Tutorial with Example in Android Studio?

This example demonstrate about Fragment Tutorial with Example in Android Studio

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"?>
<LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
   xmlns:app = "http://schemas.android.com/apk/res-auto"
   xmlns:tools = "http://schemas.android.com/tools"
   android:layout_width = "match_parent"
   android:layout_height = "match_parent"
   tools:context = ".MainActivity"
   android:orientation = "vertical">
   <Button
      android:id = "@+id/fragment1"
      android:layout_width = "wrap_content"
      android:layout_height = "wrap_content"
      android:layout_alignParentTop = "true"
      android:layout_centerHorizontal = "true"
      android:layout_marginTop = "27dp"
      android:text = "fragment1"/>
   <Button
      android:id = "@+id/fragment2"
      android:layout_width = "wrap_content"
      android:layout_height = "wrap_content"
      android:layout_alignParentTop = "true"
      android:layout_centerHorizontal = "true"
      android:layout_marginTop = "27dp"
      android:text = "fragment2"/>
   <LinearLayout
      android:id = "@+id/layout"
      android:layout_width = "wrap_content"
      android:layout_height = "wrap_content"
      android:orientation = "vertical">
   </LinearLayout>
</LinearLayout>

In the above code, we have taken button views and linear layout to show different fragments.

Step 3 − Add the following code to src /MainActivity.java

package com.example.myapplication;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

public class MainActivity extends AppCompatActivity {
   @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      final android.support.v4.app.Fragment first = new FirstFragment();
      final android.support.v4.app.Fragment second = new SecondFragment();
      findViewById(R.id.fragment1).setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            android.support.v4.app.FragmentManager fm = getSupportFragmentManager();
            android.support.v4.app.FragmentTransaction fragmentTransaction = fm.beginTransaction();
            fragmentTransaction.replace(R.id.layout, first);
            fragmentTransaction.commit();
         }
      });
      findViewById(R.id.fragment2).setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            FragmentManager fm = getSupportFragmentManager();
            FragmentTransaction fragmentTransaction = fm.beginTransaction();
            fragmentTransaction.replace(R.id.layout, second);
            fragmentTransaction.commit();
         }
      });
   }
}

Step 4 − Add the following code to src / FirstFragment.java

package com.example.myapplication;
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

@SuppressLint("ValidFragment")
public class FirstFragment extends Fragment {
   TextView textView;
   @Nullable
   @Override
   public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
      View view = inflater.inflate(R.layout.fragment, container, false);
      textView = view.findViewById(R.id.text);
      textView.setText("first");
      return view;
   }
}

Step 5 − Add the following code to src / SecondFragment.java

package com.example.myapplication;
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class SecondFragment extends Fragment {
   TextView textView;
   @Nullable
   @Override
   public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
      View view = inflater.inflate(R.layout.fragment, container, false);
      textView = view.findViewById(R.id.text);
      textView.setText("Second");
      return view;
   }
}

Step 6 − Add the following code to res/layout/ fragment.xml.

<?xml version = "1.0" encoding = "utf-8"?>
<LinearLayout
   xmlns:android = "http://schemas.android.com/apk/res/android"
   android:layout_width = "match_parent"
   android:gravity = "center"
   android:layout_height = "match_parent">
   <TextView
      android:id = "@+id/text"
      android:textSize = "30sp"
      android:layout_width = "match_parent"
      android:layout_height = "match_parent" />
</LinearLayout>

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 Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –

Now click on buttons, it will show the result as shown below –

Click here to download the project code