In the below example function I have created Snackbar in android. When you click on button a message show at the bottom of the device(mobile) screen. Snackbars appear above all other elements on screen and only one can be displayed at a time and message will be automically closed when timeout.

Here In step one first I have added Design Supprt Library. Then in second step I have added TextView , Button and CoordinatorLayout in activity_main.xml layout. Now see MainActivity I have used OnClickListener() method and Toast function. You can see below example code it clearly describe you "How to make Snackbar in android".

Step(1) - I have added first Design Supprt Library in build.gradle file-

   compile 'com.android.support:appcompat-v7:23.1.1'
       compile 'com.android.support:design:23.1.1'

Step(2)-activity_main.xml-

<LinearLayout
    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"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textStyle="bold"
        android:layout_gravity="center"
        android:textSize="20dp"
        android:text="Snackbar in Android" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="30dp"
        android:textColor="#e73434"
        android:layout_height="wrap_content"
        android:text="Show SnackBar" />

    <android.support.design.widget.CoordinatorLayout
        android:id="@+id/coordinator"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

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

</LinearLayout>

Step(3)-MainActivity-
 

public class MainActivity extends AppCompatActivity {
    Button btnShow;
    CoordinatorLayout coordinatorLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        coordinatorLayout = (CoordinatorLayout) findViewById(R.id.coordinator);
        btnShow = (Button) findViewById(R.id.button);
        btnShow.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Snackbar snackbar = Snackbar.make(coordinatorLayout, "Snackbar", Snackbar.LENGTH_LONG);

                snackbar.setAction("OK", new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Toast.makeText(MainActivity.this, "snackbar clicked", Toast.LENGTH_LONG).show();
                    }
                });
                snackbar.show();


            }
        });


    }
}