Android 彩色Toast的实现代码

<?xml version="." encoding="utf-"?>
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content">
   <TextView
     android:id="@+id/toast_message"
     android:layout_width="wrap_content"
     android:layout_height="dp"
     android:paddingStart="dp"
     android:paddingEnd="dp"
     android:gravity="center"
     android:textSize="sp"
     tools:text="This is a toast message" />
 </FrameLayout>

 package com.cloud.customviews;
 import android.content.Context;
 import android.graphics.drawable.GradientDrawable;
 import android.support.annotation.ColorRes;
 import android.support.annotation.IntDef;
 import android.support.annotation.NonNull;
 import android.support.annotation.StringRes;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.TextView;
 import android.widget.Toast;
 public class ColoredToast extends Toast {
   @IntDef(value = {
       LENGTH_SHORT,
       LENGTH_LONG
   })
   @interface Duration {}
   private ColoredToast(Context context) {
     super(context);
   }
   public static class Maker {
     private Context mContext;
     private ColoredToast mToast;
     private View mToastView;
     private TextView mTextMessage;
     public Maker(Context context) {
       mContext = context;
       mToast = new ColoredToast(context);
       mToastView = LayoutInflater.from(context).inflate(R.layout.toast_colored, null);
       mTextMessage = mToastView.findViewById(R.id.toast_message);
     }
     /**
     * Set text color and background color for toast by resource id
     */
     public Maker setColor(@ColorRes int textColor, @ColorRes int backgroundColor) {
       GradientDrawable drawable = new GradientDrawable();
       drawable.setColor(mContext.getColor(backgroundColor));
       drawable.setCornerRadius(mTextMessage.getLayoutParams().height / );
       mToastView.setBackground(drawable);
       mTextMessage.setTextColor(mContext.getColor(textColor));
       return this;
     }
     /**
     * Set position
     * @see android.view.Gravity
     */
     public Maker setGravity(int gravity, int xOffset, int yOffset) {
       mToast.setGravity(gravity, xOffset, yOffset);
       return this;
     }
     public ColoredToast makeToast(@StringRes int resId, @Duration int duration) {
       mTextMessage.setText(resId);
       mToast.setView(mToastView);
       mToast.setDuration(duration);
       return mToast;
     }
     public ColoredToast makeToast(@NonNull String text, @Duration int duration) {
       mTextMessage.setText(text);
       mToast.setView(mToastView);
       mToast.setDuration(duration);
       return mToast;
     }
   }
 }