NavigationDrawer

NavigationDrawer consente di navigare tra le varie opzioni dell’ app. Gli utenti possono attivarlo scorrendo il dito dal bordo sinistro dello schermo o toccando un icona del menu. In questo esempio utilizziamo DrawerLayout come contenitore, per consentire a NavigationView di scorrere fuori dalla sinistra dello schermo:

drawer_header.xml
<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=”match_parent”
android:background=”#2F3CD8″
    android:orientation=”vertical”>

<ImageView
android:layout_width=”match_parent”
    android:layout_height=”match_parent”
android:src=”@drawable/ic_launcher_foreground” />

</LinearLayout>

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

<item
android:id=”@+id/home”
android:icon=”@drawable/ic_launcher_background”
android:title=”Home”/>

<item
android:id=”@+id/setting”
android:icon=”@drawable/ic_launcher_background”
android:title=”Setting”/>

<item
android:id=”@+id/camera”
android:icon=”@drawable/ic_launcher_background”
android:title=”Camera”/>

</menu>

content_main.xml
<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=”match_parent”
    android:orientation=”vertical”>

</LinearLayout>

activity_main.xml
<?xml version=”1.0″ encoding=”utf-8″?>
<androidx.drawerlayout.widget.DrawerLayout 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”>

<include
layout=”@layout/content_main”/>

<com.google.android.material.navigation.NavigationView
android:layout_width=”wrap_content”
        android:layout_height=”match_parent”
android:layout_gravity=”start”
android:id=”@+id/navigation_view”
app:headerLayout=”@layout/drawer_header”
app:menu=”@menu/menu_drawer”/>

</androidx.drawerlayout.widget.DrawerLayout>

MainActivity.java
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import com.google.android.material.navigation.NavigationView;

public class MainActivity extends AppCompatActivity {

private NavigationView navigationView;

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

navigationView=findViewById(R.id.navigation_view);

navigationView.setNavigationItemSelectedListener(
new NavigationView.OnNavigationItemSelectedListener(){

@Override
public boolean
onNavigationItemSelected(MenuItem item){
switch (item.getItemId()){
case R.id.home:
Toast.makeText(MainActivity.this,”Home”,Toast.LENGTH_SHORT)
.show();
break ;

     case R.id.setting:
Toast.makeText(MainActivity.this,”Setting”,Toast.LENGTH_SHORT)
.show();
break ;

case R.id.camera:
Toast.makeText(MainActivity.this,”Camera”,Toast.LENGTH_SHORT)
.show();
break ;
}
return true;
}
});

    }
}