Xiryl

 <android.support.design.bottomappbar.BottomAppBar
        android:id="@+id/bar"
        android:layout_gravity="bottom"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:navigationIcon="@drawable/ic_menu_3">

</android.support.design.bottomappbar.BottomAppBar>

Xiryl

<resources>

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

Xiryl

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "it.x.test"
        minSdkVersion 23
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"

Xiryl

implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support:design:28.0.0'

Xiryl

{
	"nome_bacino": {
		"stazioni": [{
				"nome_stazione": "xxxxx",
				"sensori": {
					"pluviometro": {
						"api_pluviometro": "yyyy",
						"id_sensore": 1234
					},
					"idrometro": {