Creating a Snackbar can be done as follows:

Snackbar.make(view, "Text to display", Snackbar.LENGTH_LONG).show();

The view is used to find a suitable parent to use to display the Snackbar. Typically this would be a CoordinatorLayout that you've defined in your XML, which enables adding functionality such as swipe to dismiss and automatically moving of other widgets (e.g. FloatingActionButton). If there's no CoordinatorLayout then the window decor's content view is used.

Very often we also add an action to the Snackbar. A common use case would be an "Undo" action.

Snackbar.make(view, "Text to display", Snackbar.LENGTH_LONG)
        .setAction("UNDO", new View.OnClickListener() {
            @Override
               public void onClick(View view) {
                   // put your logic here

               }
         })
        .show();

You can create a Snackbar and show it later:

Snackbar snackbar = Snackbar.make(view, "Text to display", Snackbar.LENGTH_LONG); 
snackbar.show();

If you want to change the color of the Snackbar's text:

Snackbar snackbar = Snackbar.make(view, "Text to display", Snackbar.LENGTH_LONG);
View view = snackbar .getView();
TextView textView = (TextView) view.findViewById(android.support.design.R.id.snackbar_text);
textView.setTextColor(Color.parseColor("#FF4500"));
snackbar.show();

By default Snackbar dismisses on it's right swipe.This example demonstrates how to dismiss the snackBar on it's left swipe.

Function to customize snackbar

public static Snackbar makeText(Context context, String message, int duration) {
        Activity activity = (Activity) context;
        View layout;
        Snackbar snackbar = Snackbar
                .make(activity.findViewById(android.R.id.content), message, duration);
        layout = snackbar.getView();
        //setting background color
        layout.setBackgroundColor(context.getResources().getColor(R.color.orange));
        android.widget.TextView text = (android.widget.TextView) layout.findViewById(android.support.design.R.id.snackbar_text);
        //setting font color
        text.setTextColor(context.getResources().getColor(R.color.white));
        Typeface font = null;
        //Setting font 
        font = Typeface.createFromAsset(context.getAssets(), "DroidSansFallbackanmol256.ttf");
        text.setTypeface(font);
        return snackbar;

    }

Call the function from fragment or activity

 SnackBar.makeText(MyActivity.this, "Please Locate your address at Map", Snackbar.LENGTH_SHORT).show();

You can use Snackbar.Callback to listen if the snackbar was dismissed by user or timeout.

Snackbar.make(getView(), "Hi snackbar!", Snackbar.LENGTH_LONG).setCallback( new Snackbar.Callback() {
                @Override
                public void onDismissed(Snackbar snackbar, int event) {
                    switch(event) {
                        case Snackbar.Callback.DISMISS_EVENT_ACTION:
                            Toast.makeText(getActivity(), "Clicked the action", Toast.LENGTH_LONG).show();
                            break;
                        case Snackbar.Callback.DISMISS_EVENT_TIMEOUT:
                            Toast.makeText(getActivity(), "Time out", Toast.LENGTH_LONG).show();
                            break;
                    }
                }

                @Override
                public void onShown(Snackbar snackbar) {
                    Toast.makeText(getActivity(), "This is my annoying step-brother", Toast.LENGTH_LONG).show();
                }
            }).setAction("Go!", new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                }
            }).show();

This example shows a white Snackbar with custom Undo icon.

Snackbar customBar = Snackbar.make(view , "Text to be displayed", Snackbar.LENGTH_LONG);
customBar.setAction("UNDO", new View.OnClickListener() {
    @Override
    public void onClick(View view) {
    //Put the logic for undo button here

    }
});

View sbView = customBar.getView();
//Changing background to White
sbView.setBackgroundColor(Color.WHITE));

TextView snackText = (TextView) sbView.findViewById(android.support.design.R.id.snackbar_text); 
if (snackText!=null) {
    //Changing text color to Black
   snackText.setTextColor(Color.BLACK);
}

TextView actionText = (TextView) sbView.findViewById(android.support.design.R.id.snackbar_action);
if (actionText!=null) {
    // Setting custom Undo icon
    actionText.setCompoundDrawablesRelativeWithIntrinsicBounds(R.drawable.custom_undo, 0, 0, 0);
}
customBar.show();

Toasts are generally used when we want to display an information to the user regarding some action that has successfully (or not) happened and this action does not require the user to take any other action. Like when a message has been sent, for example:

Toast.makeText(this, "Message Sent!", Toast.LENGTH_SHORT).show();

Snackbars are also used to display an information. But this time, we can give the user an opportunity to take an action. For example, let's say the user deleted a picture by mistake and he wants to get it back. We can provide a Snackbar with the "Undo" action. Like this:

Snackbar.make(getCurrentFocus(), "Picture Deleted", Snackbar.LENGTH_SHORT)
        .setAction("Undo", new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //Return his picture
            }
        })
        .show();

Conclusion: Toasts are used when we don't need user interaction. Snackbars are used to allow users to take another action or undo a previous one.

Creating an Snackbar without the need pass view to Snackbar, all layout create in android in android.R.id.content.

public class CustomSnackBar {

    public static final int STATE_ERROR = 0;
    public static final int STATE_WARNING = 1;
    public static final int STATE_SUCCESS = 2;
    public static final int VIEW_PARENT = android.R.id.content;

    public CustomSnackBar(View view, String message, int actionType) {
        super();

        Snackbar snackbar = Snackbar.make(view, message, Snackbar.LENGTH_LONG);
        View sbView = snackbar.getView();
        TextView textView = (TextView) sbView.findViewById(android.support.design.R.id.snackbar_text);
        textView.setTextColor(Color.parseColor("#ffffff"));
        textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);
        textView.setGravity(View.TEXT_ALIGNMENT_CENTER);
        textView.setLayoutDirection(View.LAYOUT_DIRECTION_RTL);

        switch (actionType) {
            case STATE_ERROR:
                snackbar.getView().setBackgroundColor(Color.parseColor("#F12B2B"));
                break;
            case STATE_WARNING:
                snackbar.getView().setBackgroundColor(Color.parseColor("#000000"));
                break;
            case STATE_SUCCESS:
                snackbar.getView().setBackgroundColor(Color.parseColor("#7ED321"));
                break;
        }
        snackbar.show();
    }
}

for call class

new CustomSnackBar(findViewById(CustomSnackBar.VIEW_PARENT),"message", CustomSnackBar.STATE_ERROR);