Improve Toast RTL support

import android.app.INotificationManager;

import android.app.ITransientNotification;

import android.content.Context;

import android.content.res.Configuration;

import android.content.res.Resources;

import android.graphics.PixelFormat;

import android.os.Handler;

import android.os.RemoteException;

import android.os.ServiceManager;

import android.util.LocaleUtil;

import android.util.Log;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.accessibility.AccessibilityEvent;

import android.view.accessibility.AccessibilityManager;

import java.util.Locale;

/**

 * A toast is a view containing a quick little message for the user.  The toast class

 * helps you create and show those.

                mWM = WindowManagerImpl.getDefault();

                // We can resolve the Gravity here by using the Locale for getting

                // the layout direction

                final Locale locale = mView.getContext().getResources().getConfiguration().locale;

                final int layoutDirection = LocaleUtil.getLayoutDirectionFromLocale(locale);

                final int gravity = Gravity.getAbsoluteGravity(mGravity, layoutDirection);

                final Configuration config = mView.getContext().getResources().getConfiguration();

                final int gravity = Gravity.getAbsoluteGravity(mGravity, config.layoutDirection);

                mParams.gravity = gravity;

                if ((gravity & Gravity.HORIZONTAL_GRAVITY_MASK) == Gravity.FILL_HORIZONTAL) {

                    mParams.horizontalWeight = 1.0f;