SnackBar Android

SnackBar viene usato per fornire brevi messaggi  nella parte inferiore dello schermo per poi scomparire dopo un time-out o dopo un interazione dell’ utente.
In questo esempio utilizziamo CoordinatorLayout per scorrere lo Snackbar:

activity_main.xml
<?xml version=”1.0″ encoding=”utf-8″?>
<androidx.coordinatorLayout.widget.CoordinatorLayout 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/coordinatorLayout”
    tools:context=”.MainActivity”>

    <Button
        android:layout_width=”wrap_content”
        android:layout_height=”wrap_content”
android:id=”@+id/btn”
android:layout_marginTop=”50dp”
android:text=”Snackbar.LENGTH_SHORT”
android:textSize=”15sp”/>

<Button
        android:layout_width=”wrap_content”
        android:layout_height=”wrap_content”
android:id=”@+id/btn2″
android:layout_marginTop=”150dp”
android:text=”Snackbar.LENGTH_LONG”
android:textSize=”15sp”/>

<Button
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:id=”@+id/btn3″
android:layout_marginTop=”250dp”
android:text=”Snackbar.LENGTH_INDEFINITE”
android:textSize=”15sp”/>

</androidx.coordinatorLayout.widget.CoordinatorLayout>

MainActivity.java
package com.example.snackBar;

import android.view.View;
import android.widget.Button;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import androidx.coordinatorlayout.widget.CoordinatorLayout;
import com.google.android.material.snackbar.Snackbar;

public class MainActivity extends AppCompatActivity {

    CoordinatorLayout coordinatorLayout;

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

Button btnOne=findViewById(R.id.btn);
Button btnTwo=findViewById(R.id.btn2);
Button btnThree=findViewById(R.id.btn3);
coordinatorLayout=findViewById(R.id.coordinatorLayout);

btnOne.setOnClickListener(new View.OnClickListener(){
@Override
public  void onClick(View view){

Snackbar.make(coordinatorLayout,”SnackBar Message”,Snackbar.LENGTH_SHORT)
.show();
}
});

btnTwo.setOnClickListener(new View.OnClickListener(){
@Override
public  void onClick(View view){

Snackbar.make(coordinatorLayout,”SnackBar Message”,Snackbar.LENGTH_LONG)
.setDuration(7000)
.show();
}
});

btnThree.setOnClickListener(new View.OnClickListener(){
@Override
public  void onClick(View view){

Snackbar.make(coordinatorLayout,”SnackBar Message”,Snackbar.LENGTH_INDEFINITE)
.setAction(“DISMISS”,new View.OnClickListener(){
@Override
public void onClick(View view){
}
})
.show();
}
});

    }
}