What is Fragment in android

Hey Guys, In this article we are going to discuss how to make fragment in android App

Fragment in android

Now go to main Activity.java and make two buttons in Activity

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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"
    android:id="@+id/holder"
    tools:context=".MainActivity">


    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    <Button
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:text="sign in"
        android:id="@+id/signIn"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="10dp"
        android:layout_marginLeft="10dp"
        />

        <Button
            android:layout_width="150dp"
            android:layout_height="wrap_content"
            android:text="sign up"
            android:id="@+id/signUp"
            android:layout_alignParentBottom="true"
            android:layout_alignParentRight="true"
            android:layout_marginBottom="10dp"
            android:layout_marginRight="10dp"/>

    </RelativeLayout>

</FrameLayout>

Now create two blank fragment and give it name SignInFragment and SignUpFragment

SignInFragment.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#e2ed09"
    tools:context=".SignIn_Fragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="Sign In"
        android:gravity="center"
        android:textColor="#000"
        android:textSize="40dp"/>

</FrameLayout>

SignupFragment.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#df1010"
    tools:context=".SignUp_Fragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="Sign Up"
        android:textColor="#fff"
        android:gravity="center"
        android:textSize="40dp"/>

</FrameLayout>

Now go to MainActivity.java and copy paste this code

MainActivity.java

package com.thecodingshef.fragmentdemo;

import android.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {


    Button btn_SignIn,btn_SignUp;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        btn_SignIn=findViewById(R.id.signIn);
        btn_SignUp=findViewById(R.id.signUp);


        btn_SignIn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                android.support.v4.app.FragmentManager fm=getSupportFragmentManager();
                fm.beginTransaction().replace(R.id.holder,new SignIn_Fragment()).addToBackStack(null).commit();

            }
        });


        btn_SignUp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                android.support.v4.app.FragmentManager fm=getSupportFragmentManager();
                fm.beginTransaction().replace(R.id.holder,new SignUp_Fragment()).addToBackStack(null).commit();



            }
        });
    }
}

Now our code is complete, and we have used fragment in our app successfully.