BottomNavigationView With Fragment ,Bottom Nab Bar

 

1. Open "builde.gradle" and implementation "com.android.support:design:27.1.1" .

 

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.eduapp.tutorial.bengali.bottomnavbar"
        minSdkVersion 18
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.android.support:support-v4:27.1.1'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.android.support:design:27.1.1'
}

2. Create Menu Folder under "res" folder,then make "bottom_nav_bar.xml" under menu folder.

 
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:title="@string/call"
        android:icon="@drawable/ic_call_black_24dp"
        android:id="@+id/call"/>
    <item android:title="@string/contact"
        android:icon="@drawable/ic_contacts_black_24dp"
        android:id="@+id/contacts"/>
    <item android:title="@string/settings"
        android:icon="@drawable/ic_settings_applications_black_24dp"
        android:id="@+id/settings"/>
</menu>

3. Open "activity_main.xml" and copy below code than paste.

 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/bottomNavBar"
        android:id="@+id/frame_content">

    </FrameLayout>

    <android.support.design.widget.BottomNavigationView
        android:id="@+id/bottomNavBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimary"
        app:itemIconTint="@android:color/white"
        app:itemTextColor="@android:color/white"
        android:layout_alignParentBottom="true"
        app:menu="@menu/bottom_nav_bar"
        >

    </android.support.design.widget.BottomNavigationView>

</RelativeLayout>

4. Create new Frgment "CallFragment,ContactFragment,SettingsFragment" and open "fragment.xml" . And copy below code than paste.

 
<?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"
    tools:context=".fragments.CallFragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="@string/call_fragment"
        android:textSize="24sp"
        android:textStyle="bold"
        android:gravity="center"
        android:textColor="@color/colorPrimary"/>

</FrameLayout>

5. Open "MainActivity.java" and copy below code and paste.

 

package com.eduapp.tutorial.bengali.bottomnavbar;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MenuItem;

import com.eduapp.tutorial.bengali.bottomnavbar.fragments.CallFragment;
import com.eduapp.tutorial.bengali.bottomnavbar.fragments.ContactFragment;
import com.eduapp.tutorial.bengali.bottomnavbar.fragments.SettingsFragment;

public class MainActivity extends AppCompatActivity {
    private BottomNavigationView bottomNavigationView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bottomNavigationView = findViewById(R.id.bottomNavBar);
        bottomNavigationView.setOnNavigationItemSelectedListener(listaner);
        getSupportFragmentManager().beginTransaction().replace(R.id.frame_content,new ContactFragment()).commit();
    }

    BottomNavigationView.OnNavigationItemSelectedListener listaner =
            new BottomNavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
            Fragment fragment;
            switch (item.getItemId()){
                case R.id.call:
                    fragment = new CallFragment();
                    loadFragment(fragment);
                    return true;
                case R.id.contacts:
                    fragment = new ContactFragment();
                    loadFragment(fragment);
                    return true;
                case R.id.settings:
                    fragment = new SettingsFragment();
                    loadFragment(fragment);
                    return true;
            }
            return false;
        }
    };

    private void loadFragment(Fragment fragment) {
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        transaction.replace(R.id.frame_content,fragment);
        transaction.addToBackStack(null);
        transaction.commit();
    }
}

Run this application and enjoy.