custom_toast_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">

    <androidx.cardview.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        app:cardCornerRadius="0dp"
        app:cardElevation="5dp"
        app:cardUseCompatPadding="true">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="60dp"
            android:orientation="vertical">

            <View
                android:id="@+id/toastColor"
                android:layout_width="8dp"
                android:layout_height="match_parent"
                android:background="@android:color/holo_green_light" />

            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:layout_marginStart="20dp"
                android:layout_toEndOf="@+id/toastColor"
                android:orientation="vertical">

                <TextView
                    android:id="@+id/toastTitle"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Success"
                    android:textColor="#000000"
                    android:textSize="16sp"
                    android:textStyle="bold" />

                <TextView
                    android:id="@+id/toastMessage"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="2dp"
                    android:maxLines="1"
                    android:text="Custom Toast Message" />
            </LinearLayout>

        </RelativeLayout>
    </androidx.cardview.widget.CardView>
</RelativeLayout>

LearnosetToast.java

import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

public class LearnosetToast extends Toast {

    private final Context context;
    private LearnosetToastTypes learnosetToastTypes;
    private TextView toastTitle;
    private TextView toastMessage;
    private View toastColor;

    public LearnosetToast(Context context) {
        super(context);
        this.learnosetToastTypes = LearnosetToastTypes.SUCCESS;
        this.context = context;
        init();
    }

    private void init() {

        // creating layout inflater to get custom Toast view from res/layout folder
        final LayoutInflater layoutInflater = LayoutInflater.from(context);

        // getting custom Toast view from res/layout folder
        final View customView = layoutInflater.inflate(R.layout.custom_toast_layout, null);

        // getting title TextView from layout
        toastTitle = customView.findViewById(R.id.toastTitle);

        // getting message TextView from layout
        toastMessage = customView.findViewById(R.id.toastMessage);

        toastColor = customView.findViewById(R.id.toastColor);

        // setting custom view to Toast
        setView(customView);
    }

    public void setType(LearnosetToastTypes learnosetToastTypes) {
        this.learnosetToastTypes = learnosetToastTypes;
    }

    public void setToastMessage(String message) {
        toastMessage.setText(message);
    }

    public void show() {

        if (learnosetToastTypes == LearnosetToastTypes.SUCCESS) {
            toastTitle.setText("Success");
            toastColor.setBackgroundColor(context.getResources().getColor(android.R.color.holo_green_light));
        } else if (learnosetToastTypes == LearnosetToastTypes.FAILED) {
            toastTitle.setText("Failed!");
            toastColor.setBackgroundColor(context.getResources().getColor(android.R.color.holo_red_light));
        } else if (learnosetToastTypes == LearnosetToastTypes.WARNING) {
            toastTitle.setText("Warning!");
            toastColor.setBackgroundColor(Color.YELLOW);
        } else if (learnosetToastTypes == LearnosetToastTypes.INFO) {
            toastTitle.setText("Info");
            toastColor.setBackgroundColor(context.getResources().getColor(android.R.color.holo_blue_light));
        } else if (learnosetToastTypes == LearnosetToastTypes.ERROR) {
            toastTitle.setText("Error!");
            toastColor.setBackgroundColor(context.getResources().getColor(android.R.color.holo_red_light));
        }

        super.show();
    }

    public enum LearnosetToastTypes {
        SUCCESS,
        FAILED,
        WARNING,
        INFO,
        ERROR,
    }
}

MainActivity.java

import android.os.Bundle;
import android.view.Gravity;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private static final int REQUEST_CODE = 102;

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


        // creating LearnosetToast object
        LearnosetToast learnosetToast = new LearnosetToast(MainActivity.this);
        learnosetToast.setDuration(Toast.LENGTH_LONG); // set Toast duration
        learnosetToast.setGravity(Gravity.BOTTOM, 0, 0); //  set gravity
        learnosetToast.setType(LearnosetToast.LearnosetToastTypes.ERROR); //  set Toast type. must be success, error, failed, etc.
        learnosetToast.setToastMessage("Your custom Message goes here"); //  Custom message for toast
        learnosetToast.show(); //  show toast
    }
}

Output