How can I change background of custom toasts message without more than one background xml?

Question

I want to change background of my custom toast message but I don't want to create a new xml file for each color. More specifically;

This is my custom_toast_border.xml file which is under the drawable directory.

<shape xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="wrap_content"
android:layout_width="match_parent">
<stroke android:width="1dp" android:color="@color/toastGreen" />
<corners android:radius="0dp" />
<gradient android:startColor="@color/toastGreen"
    android:endColor="@color/toastGreen"
    android:angle="-90"/>

And my custom_toast.xml layout like that

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/custom_toast_container"
android:layout_width="match_parent"
android:layout_height="80dp"
android:background="@drawable/custom_toast_border"
android:layout_gravity="bottom|center_horizontal"
android:orientation="horizontal">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="80dp">

    <TextView
        android:id="@+id/tv_toast_message"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:fontFamily="@font/futura_book"
        android:padding="3dp"
        android:text="Toast Message"
        android:textAlignment="center"
        android:textColor="@color/black"
        android:textSize="17sp" />

</LinearLayout>

Java code:

    ..... inflater = getLayoutInflater();
    layout = inflater.inflate(R.layout.custom_toast,null);
    toast_message = layout.findViewById(R.id.tv_toast_message);
    Toast toast = new Toast(getActivity().getApplicationContext());
        //View view = toast.getView(); //It is failed. Null object referance
        //view.getBackground().setColorFilter(getResources().getColor(R.color.toastRed), PorterDuff.Mode.SRC_IN);
        toast.setGravity(Gravity.FILL_HORIZONTAL | Gravity.BOTTOM, 0, 0);
        toast.setDuration(Toast.LENGTH_LONG);
        toast.setView(layout);
        toast.show();

I want to three different color for toast background. Do I have to create separate file for each color? (like custom_toast_border_red, ..._green, .._yellow). Can't I change the background color from within java code? Please be careful, I don't want to change text color, I want to change background color. Most of the answers to previous questions explained how to change the text color.

Answer 1

GradientDrawable containerDrawable = (GradientDrawable) layout.findViewById(R.id.custom_toast_container).getBackground();
containerDrawable.setColor(Color.GREEN); // CHANGE BG COLOR
containerDrawable.setStroke(1,Color.GREEN); // CHANGE THE STROKE COLOR