Android Create Bottom Navigation Basic With Auto Hide When Scroll

Android Create Bottom Navigation Basic Auto Hide When Scroll


1. Project Structure

Package name : basic.bottomnavigation.fyprojects.com.fy


2. Gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "basic.bottomnavigation.fyprojects.com.fy"
        minSdkVersion 16
        targetSdkVersion 28
        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(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    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:28.0.0'
    implementation 'com.android.support:support-v13:28.0.0'
    implementation 'com.android.support:recyclerview-v7:28.0.0'
    implementation 'com.github.bumptech.glide:glide:3.7.0'
    implementation 'com.balysv:material-ripple:1.0.2'
}


3. Res Folder Dtructure

activity_main.xml

<?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"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/grey_5">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <android.support.v4.widget.NestedScrollView
            android:id="@+id/nested_scroll_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scrollbars="none"
            android:scrollingCache="true">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:descendantFocusability="blocksDescendants"
                android:orientation="vertical">

                <View
                    android:layout_width="match_parent"
                    android:layout_height="?attr/actionBarSize"
                    android:layout_marginBottom="@dimen/spacing_middle" />

                <include layout="@layout/fragment_tabs_store" />

            </LinearLayout>

        </android.support.v4.widget.NestedScrollView>

    </LinearLayout>

    <!-- search bar layout -->
    <include
        android:id="@+id/search_bar"
        layout="@layout/include_card_view_search_bar" />

    <android.support.design.widget.BottomNavigationView
        android:id="@+id/navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_gravity="bottom"
        android:background="@color/grey_60"
        app:itemIconTint="@drawable/color_state_white_1"
        app:itemTextColor="@drawable/color_state_white_1"
        app:menu="@menu/menu_bottom_navigation_basic" />

</RelativeLayout>


fragment_tabs_store.xml

<android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/nested_scroll_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:clipToPadding="false"
    android:scrollbars="none"
    android:scrollingCache="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="@dimen/spacing_large"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            android:paddingLeft="@dimen/spacing_large"
            android:paddingRight="@dimen/spacing_large">

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="New Releases"
                android:textAppearance="@style/Base.TextAppearance.AppCompat.Title" />

            <Button
                style="@style/Widget.AppCompat.Button.Borderless"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center"
                android:minWidth="0dp"
                android:text="MORE"
                android:textColor="@color/grey_60" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:padding="@dimen/spacing_medium"
            android:visibility="visible">

            <android.support.v7.widget.CardView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/spacing_medium"
                android:layout_weight="1"
                app:cardCornerRadius="2dp"
                app:cardElevation="2dp">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <ImageView
                        android:id="@+id/image_1"
                        android:layout_width="match_parent"
                        android:layout_height="180dp"
                        android:background="@color/grey_40"
                        android:scaleType="centerCrop" />

                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:gravity="center"
                        android:orientation="horizontal"
                        android:padding="@dimen/spacing_large">

                        <LinearLayout
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:orientation="vertical">

                            <TextView
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content"
                                android:maxLines="1"
                                android:singleLine="true"
                                android:text="Mauris sagittis non elit"
                                android:textAppearance="@style/TextAppearance.Medium.Bold"
                                android:textColor="@color/grey_90" />

                            <TextView
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content"
                                android:text="Kodaline" />

                        </LinearLayout>

                        <ImageButton
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:background="?attr/selectableItemBackgroundBorderless"
                            android:tint="@color/grey_40"
                            app:srcCompat="@drawable/ic_more_vert" />

                    </LinearLayout>

                </LinearLayout>
            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/spacing_medium"
                android:layout_weight="1"
                app:cardCornerRadius="2dp"
                app:cardElevation="2dp">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <ImageView
                        android:id="@+id/image_2"
                        android:layout_width="match_parent"
                        android:layout_height="180dp"
                        android:background="@color/grey_40"
                        android:scaleType="centerCrop" />

                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:gravity="center"
                        android:orientation="horizontal"
                        android:padding="@dimen/spacing_large">

                        <LinearLayout
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:orientation="vertical">

                            <TextView
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content"
                                android:maxLines="1"
                                android:singleLine="true"
                                android:text="Aliquam"
                                android:textAppearance="@style/TextAppearance.Medium.Bold"
                                android:textColor="@color/grey_90" />

                            <TextView
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content"
                                android:text="One Republic" />

                        </LinearLayout>

                        <ImageButton
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:background="?attr/selectableItemBackgroundBorderless"
                            android:tint="@color/grey_40"
                            app:srcCompat="@drawable/ic_more_vert" />

                    </LinearLayout>

                </LinearLayout>
            </android.support.v7.widget.CardView>

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            android:paddingLeft="@dimen/spacing_large"
            android:paddingRight="@dimen/spacing_large">

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Recommended"
                android:textAppearance="@style/Base.TextAppearance.AppCompat.Title" />

            <Button
                style="@style/Widget.AppCompat.Button.Borderless"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center"
                android:minWidth="0dp"
                android:text="MORE"
                android:textColor="@color/grey_60" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:padding="@dimen/spacing_medium"
            android:visibility="visible">

            <android.support.v7.widget.CardView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/spacing_medium"
                android:layout_weight="1"
                app:cardCornerRadius="2dp"
                app:cardElevation="2dp">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <ImageView
                        android:id="@+id/image_3"
                        android:layout_width="match_parent"
                        android:layout_height="120dp"
                        android:background="@color/grey_40"
                        android:scaleType="centerCrop" />

                    <TextView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:maxLines="1"
                        android:padding="@dimen/spacing_large"
                        android:singleLine="true"
                        android:text="Curabitur tempus"
                        android:textAppearance="@style/TextAppearance.Medium.Bold"
                        android:textColor="@color/grey_90" />

                </LinearLayout>
            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/spacing_medium"
                android:layout_weight="1"
                app:cardCornerRadius="2dp"
                app:cardElevation="2dp">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <ImageView
                        android:id="@+id/image_4"
                        android:layout_width="match_parent"
                        android:layout_height="120dp"
                        android:background="@color/grey_40"
                        android:scaleType="centerCrop" />

                    <TextView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:maxLines="1"
                        android:padding="@dimen/spacing_large"
                        android:singleLine="true"
                        android:text="Quisque"
                        android:textAppearance="@style/TextAppearance.Medium.Bold"
                        android:textColor="@color/grey_90" />

                </LinearLayout>
            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/spacing_medium"
                android:layout_weight="1"
                app:cardCornerRadius="2dp"
                app:cardElevation="2dp">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <ImageView
                        android:id="@+id/image_5"
                        android:layout_width="match_parent"
                        android:layout_height="120dp"
                        android:background="@color/grey_40"
                        android:scaleType="centerCrop" />

                    <TextView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:maxLines="1"
                        android:padding="@dimen/spacing_large"
                        android:singleLine="true"
                        android:text="Aliquam ac elit"
                        android:textAppearance="@style/TextAppearance.Medium.Bold"
                        android:textColor="@color/grey_90" />

                </LinearLayout>
            </android.support.v7.widget.CardView>

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            android:paddingLeft="@dimen/spacing_large"
            android:paddingRight="@dimen/spacing_large">

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Top Rated"
                android:textAppearance="@style/Base.TextAppearance.AppCompat.Title" />

            <Button
                style="@style/Widget.AppCompat.Button.Borderless"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center"
                android:minWidth="0dp"
                android:text="MORE"
                android:textColor="@color/grey_60" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="@dimen/spacing_large"
            android:orientation="horizontal"
            android:padding="@dimen/spacing_medium"
            android:visibility="visible">

            <android.support.v7.widget.CardView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/spacing_medium"
                android:layout_weight="1"
                app:cardCornerRadius="2dp"
                app:cardElevation="2dp">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <ImageView
                        android:id="@+id/image_6"
                        android:layout_width="match_parent"
                        android:layout_height="180dp"
                        android:background="@color/grey_40"
                        android:scaleType="centerCrop" />

                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:gravity="center"
                        android:orientation="horizontal"
                        android:padding="@dimen/spacing_large">

                        <LinearLayout
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:orientation="vertical">

                            <TextView
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content"
                                android:maxLines="1"
                                android:singleLine="true"
                                android:text="Suspendisse ornare"
                                android:textAppearance="@style/TextAppearance.Medium.Bold"
                                android:textColor="@color/grey_90" />

                            <TextView
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content"
                                android:text="Adipiscing" />

                        </LinearLayout>

                        <ImageButton
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:background="?attr/selectableItemBackgroundBorderless"
                            android:tint="@color/grey_40"
                            app:srcCompat="@drawable/ic_more_vert" />

                    </LinearLayout>

                </LinearLayout>
            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/spacing_medium"
                android:layout_weight="1"
                app:cardCornerRadius="2dp"
                app:cardElevation="2dp">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <ImageView
                        android:id="@+id/image_7"
                        android:layout_width="match_parent"
                        android:layout_height="180dp"
                        android:background="@color/grey_40"
                        android:scaleType="centerCrop" />

                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:gravity="center"
                        android:orientation="horizontal"
                        android:padding="@dimen/spacing_large">

                        <LinearLayout
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:orientation="vertical">

                            <TextView
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content"
                                android:maxLines="1"
                                android:singleLine="true"
                                android:text="Placerat vel ipsum"
                                android:textAppearance="@style/TextAppearance.Medium.Bold"
                                android:textColor="@color/grey_90" />

                            <TextView
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content"
                                android:text="amet rutrum" />

                        </LinearLayout>

                        <ImageButton
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:background="?attr/selectableItemBackgroundBorderless"
                            android:tint="@color/grey_40"
                            app:srcCompat="@drawable/ic_more_vert" />

                    </LinearLayout>

                </LinearLayout>
            </android.support.v7.widget.CardView>

        </LinearLayout>

    </LinearLayout>

</android.support.v4.widget.NestedScrollView>


include_card_view_search_bar.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"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:fitsSystemWindows="true"
    android:orientation="vertical">

    <android.support.v7.widget.CardView
        android:id="@+id/search_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="@dimen/spacing_middle"
        android:layout_marginLeft="@dimen/spacing_middle"
        android:layout_marginRight="@dimen/spacing_middle"
        android:layout_marginTop="@dimen/spacing_large"
        android:clipToPadding="false"
        app:cardBackgroundColor="@android:color/white"
        app:cardCornerRadius="3dp"
        app:cardElevation="3dp"
        app:cardUseCompatPadding="false"
        app:layout_collapseMode="parallax">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal">

            <ImageButton
                android:id="@+id/bt_menu"
                android:layout_width="?attr/actionBarSize"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/selectableItemBackgroundBorderless"
                android:tint="@color/grey_60"
                app:srcCompat="@drawable/ic_stack_menu" />

            <TextView
                android:id="@+id/search_text"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:gravity="center_vertical"
                android:text="Search"
                android:textAppearance="@style/Base.TextAppearance.AppCompat.Subhead"
                android:textColor="@color/grey_40" />

            <ImageButton
                android:layout_width="?attr/actionBarSize"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/selectableItemBackgroundBorderless"
                android:tint="@color/grey_60"
                app:srcCompat="@drawable/ic_mic" />

        </LinearLayout>

    </android.support.v7.widget.CardView>

</LinearLayout>


menu_bottom_navigation_basic.xml

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

    <item
        android:id="@+id/navigation_recent"
        android:icon="@drawable/ic_recent"
        android:title="Recents" />

    <item
        android:id="@+id/navigation_favorites"
        android:icon="@drawable/ic_favorites"
        android:title="Favorites" />

    <item
        android:id="@+id/navigation_nearby"
        android:icon="@drawable/ic_nearby"
        android:title="Nearby" />

</menu>


colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#1976D2</color>
    <color name="colorPrimaryDark">#1565C0</color>
    <color name="colorPrimaryLight">#1E88E5</color>
    <color name="colorAccent">#FF4081</color>
    <color name="colorAccentDark">#F50057</color>
    <color name="colorAccentLight">#FF80AB</color>

    <color name="grey_3">#f7f7f7</color>
    <color name="grey_5">#f2f2f2</color>
    <color name="grey_10">#e6e6e6</color>
    <color name="grey_20">#cccccc</color>
    <color name="grey_40">#999999</color>
    <color name="grey_60">#666666</color>
    <color name="grey_80">#37474F</color>
    <color name="grey_90">#263238</color>
    <color name="grey_95">#1a1a1a</color>
    <color name="grey_100_">#0d0d0d</color>
</resources>


dimen.xml

<resources>
    <!--genaral spacing-->
    <dimen name="spacing_xsmall">2dp</dimen>
    <dimen name="spacing_small">3dp</dimen>
    <dimen name="spacing_medium">5dp</dimen>
    <dimen name="spacing_xmedium">7dp</dimen>
    <dimen name="spacing_middle">10dp</dimen>
    <dimen name="spacing_large">15dp</dimen>
    <dimen name="spacing_smlarge">18dp</dimen>
    <dimen name="spacing_mlarge">20dp</dimen>
    <dimen name="spacing_mxlarge">25dp</dimen>
    <dimen name="spacing_xlarge">35dp</dimen>
    <dimen name="spacing_xmlarge">40dp</dimen>
    <dimen name="spacing_xxlarge">50dp</dimen>
    <dimen name="spacing_xxxlarge">55dp</dimen>
    <dimen name="appbar_padding_top">8dp</dimen>
</resources>


strings.xml

<resources>
    <string name="app_name">BottomNavigationBasic</string>
    <string name="bottom_sheet_behavior" translatable="false">android.support.design.widget.BottomSheetBehavior</string>
</resources>


styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

    <!--style for ripple library-->
    <style name="RippleStyleWhite">
        <item name="mrl_rippleOverlay">true</item>
        <item name="mrl_rippleColor">#80FFFFFF</item>
        <item name="mrl_rippleHover">true</item>
        <item name="mrl_rippleAlpha">0.2</item>
    </style>

    <style name="RippleStyleBlack" parent="RippleStyleWhite">
        <item name="mrl_rippleColor">#8096989A</item>
    </style>

    <style name="Button.Primary" parent="@style/Widget.AppCompat.Button.Colored">
        <item name="colorButtonNormal">@color/colorPrimary</item>
        <item name="android:textColor">@android:color/white</item>
    </style>
    <style name="TextAppearance.Medium.Bold" parent="@style/TextAppearance.AppCompat.Medium">
        <item name="android:textStyle">bold</item>
    </style>

</resources>


4. Utils

Tools

package basic.bottomnavigation.fyprojects.com.fy.utils;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.Build;
import android.support.annotation.ColorRes;
import android.support.annotation.DrawableRes;
import android.support.v4.graphics.drawable.RoundedBitmapDrawable;
import android.support.v4.graphics.drawable.RoundedBitmapDrawableFactory;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;
import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;
import com.bumptech.glide.request.target.BitmapImageViewTarget;
import basic.bottomnavigation.fyprojects.com.fy.R;

public class Tools {

    public static void displayImageOriginal(Context ctx, ImageView img, @DrawableRes int drawable) {
        try {
            Glide.with(ctx).load(drawable)
                    .crossFade()
                    .diskCacheStrategy(DiskCacheStrategy.NONE)
                    .into(img);
        } catch (Exception e) {
        }
    }

    public static void setSystemBarColor(Activity act, @ColorRes int color) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            Window window = act.getWindow();
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            window.setStatusBarColor(act.getResources().getColor(color));
        }
    }

    public static void setSystemBarLight(Activity act) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            View view = act.findViewById(android.R.id.content);
            int flags = view.getSystemUiVisibility();
            flags |= View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR;
            view.setSystemUiVisibility(flags);
        }
    }

}


5. Activity

MainActivity

package basic.bottomnavigation.fyprojects.com.fy;

import android.content.DialogInterface;
import android.os.Build;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.design.widget.BottomSheetBehavior;
import android.support.design.widget.BottomSheetDialog;
import android.support.v4.widget.NestedScrollView;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;  
import android.view.MenuItem;
import android.view.View; 
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import basic.bottomnavigation.fyprojects.com.fy.utils.Tools;

public class MainActivity extends AppCompatActivity {

    private TextView mTextMessage;
    private BottomNavigationView navigation;
    private View search_bar;

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

        initComponent();
    }

    private void initComponent() {
        search_bar = (View) findViewById(R.id.search_bar);
        mTextMessage = (TextView) findViewById(R.id.search_text);

        navigation = (BottomNavigationView) findViewById(R.id.navigation);
        navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                switch (item.getItemId()) {
                    case R.id.navigation_recent:
                        mTextMessage.setText(item.getTitle());
                        return true;
                    case R.id.navigation_favorites:
                        mTextMessage.setText(item.getTitle());
                        return true;
                    case R.id.navigation_nearby:
                        mTextMessage.setText(item.getTitle());
                        return true;
                }
                return false;
            }
        });

        NestedScrollView nested_content = (NestedScrollView) findViewById(R.id.nested_scroll_view);
        nested_content.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
            @Override
            public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
                if (scrollY < oldScrollY) { // up
                    animateNavigation(false);
                    animateSearchBar(false);
                }
                if (scrollY > oldScrollY) { // down
                    animateNavigation(true);
                    animateSearchBar(true);
                }
            }
        });

        // display image
        Tools.displayImageOriginal(this, (ImageView) findViewById(R.id.image_1), R.drawable.image_8);
        Tools.displayImageOriginal(this, (ImageView) findViewById(R.id.image_2), R.drawable.image_9);
        Tools.displayImageOriginal(this, (ImageView) findViewById(R.id.image_3), R.drawable.image_15);
        Tools.displayImageOriginal(this, (ImageView) findViewById(R.id.image_4), R.drawable.image_14);
        Tools.displayImageOriginal(this, (ImageView) findViewById(R.id.image_5), R.drawable.image_12);
        Tools.displayImageOriginal(this, (ImageView) findViewById(R.id.image_6), R.drawable.image_2);
        Tools.displayImageOriginal(this, (ImageView) findViewById(R.id.image_7), R.drawable.image_5);

        ((ImageButton) findViewById(R.id.bt_menu)).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });


        Tools.setSystemBarColor(this, R.color.grey_5);
        Tools.setSystemBarLight(this);
    }


    boolean isNavigationHide = false;

    private void animateNavigation(final boolean hide) {
        if (isNavigationHide && hide || !isNavigationHide && !hide) return;
        isNavigationHide = hide;
        int moveY = hide ? (2 * navigation.getHeight()) : 0;
        navigation.animate().translationY(moveY).setStartDelay(100).setDuration(300).start();
    }

    boolean isSearchBarHide = false;

    private void animateSearchBar(final boolean hide) {
        if (isSearchBarHide && hide || !isSearchBarHide && !hide) return;
        isSearchBarHide = hide;
        int moveY = hide ? -(2 * search_bar.getHeight()) : 0;
        search_bar.animate().translationY(moveY).setStartDelay(100).setDuration(300).start();
    }
}