How to use snackbar in Android?

This example demonstrates how do I use snackBar in android.
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
   tools:context=".MainActivity">
   <TextView
      android:id="@+id/textView"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"
      android:text="Click button below to bring up snackBar" />
   <Button
      android:id="@+id/callbackButton"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"
      android:layout_below="@id/textView"
      android:layout_marginTop="16sp"
      android:text="Tap To Display SnackBar"
      android:textStyle="bold"
      android:textSize="16sp"/>
</RelativeLayout>
Step 3 – Open build.gradle(Module app) add the following dependancy -
implementation 'com.android.support:design:28.0.0'
Step 4 − Add the following code to src/MainActivity.java
import android.graphics.Color;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      Button button = findViewById(R.id.callbackButton);
      button.setOnClickListener(new View.OnClickListener() {
         public void onClick(View v) {
            Snackbar snackBar = Snackbar .make(v, "An Error Occurred!", Snackbar.LENGTH_LONG) .setAction("RETRY", new View.OnClickListener() {
               @Override
               public void onClick(View view) {
               }
            });
            snackBar.setActionTextColor(Color.BLUE);
            View snackBarView = snackBar.getView();
            TextView textView = snackBarView.findViewById(android.support.design.R.id.snackbar_text);
            textView.setTextColor(Color.RED);
            snackBar.show();
         }
      });
   }
}
Step 4 - Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run  Icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –
Click here to download the project code.