flutter_icons:
  android: true
  ios: true
  image_path: "lib/assets/icon.png"

flutter pub get

flutter pub run flutter_launcher_icons:main

keytool -genkey -v -keystore C:\android\jks\key.jks -storetype JKS -keyalg RSA -keysize 2048 -validity 10000 -alias key

    signingConfigs {
        release {
            storeFile file("C:\\android\\jks\\key.jks")
            storePassword "Password"
            keyAlias "key"
            keyPassword "Password"
        }
    }
    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.release
        }
    }

flutter build appbundle

<?php wp_body_open();?>

<?php
/*
Plugin Name: Z-Electric-bulletin-board
Plugin URI: https://zip358.com/plugin/Z-Electric-bulletin-board.zip
Description: お知らせ
Author: taoka toshiaki
Version: 1.0
Author URI: https://zip358.com/
*/
add_action( 'wp_head', function() {
    $color = get_option('ZEBB_color')?get_option('ZEBB_color'):"ffffff";
    $cssdata ="
    <style>
        /* =====================
            電光掲示板
        ======================= */
        .ledText {
            overflow: hidden;
            position: relative;
            padding:5px 0;
            color: #$color;
            font-size: 60px;
            font-weight: bold;
            background: #333333;
        }
        /* CSS3グラデーションでドット感を出す */
        .ledText:after {
            content: ' ';
            display: block;
            position: absolute;
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
            background-image: linear-gradient(#0a0600 1px, transparent 0px), linear-gradient(0, #0a0600 1px, transparent 1px);
            background-image: -webkit-linear-gradient(#0a0600 1px, transparent 0px), -webkit-linear-gradient(0, #0a0600 1px, transparent 1px);
            background-size: 2px 2px;
            z-index: 10;
        }
        /* CSS3アニメーションでスクロール */
        .ledText span {
            display: inline-block;
            white-space: nowrap;
            padding-left: 100%;
            -webkit-animation-name: marquee;
            -webkit-animation-timing-function: linear;
            -webkit-animation-iteration-count: infinite;
            -webkit-animation-duration: 15s;
            -moz-animation-name: marquee;
            -moz-animation-timing-function: linear;
            -moz-animation-iteration-count: infinite;
            -moz-animation-duration: 15s;
            animation-name: marquee;
            animation-timing-function: linear;
            animation-iteration-count: infinite;
            animation-duration: 15s;
        }
        @-webkit-keyframes marquee {
        from   { -webkit-transform: translate(0%);}
        99%,to { -webkit-transform: translate(-100%);}
        }
        @-moz-keyframes marquee {
        from   { -moz-transform: translate(0%);}
        99%,to { -moz-transform: translate(-100%);}
        }
        @keyframes marquee {
        from   { transform: translate(0%);}
        99%,to { transform: translate(-100%);}
        }
    </style>
    ";
    print $cssdata;
 });
add_action("wp_body_open",function(){
    $text = get_option('ZEBB_text')?get_option('ZEBB_text'):"";
    if($text)print '<p class="ledText"><span>'.$text.'</span></p>';
});
add_action('admin_menu','Z_Electric_bulletin_board_set');
function Z_Electric_bulletin_board_set(){
	add_options_page(
		'zip358.com：プラグイン',
		'電光掲示板設定',
		'administrator',
		'Z_Electric_bulletin_board',
		function(){
            if(isset($_POST["ZEBB_color"]) or isset($_POST["ZEBB_text"])){
                $color = preg_match("/[a-zA-Z0-9]*/",$_POST["ZEBB_color"])?$_POST["ZEBB_color"]:"ffffff";
                update_option('ZEBB_color', wp_unslash($color));
                $text = $_POST["ZEBB_text"];
                update_option('ZEBB_text', wp_unslash($text));
            }
            ?>
            <form method="post" action="">
                <h2>電光掲示板設定</h2>
                color code #<input type="text" style="width:350px" name="ZEBB_color" value="<?=get_option('ZEBB_color')?get_option('ZEBB_color'):""?>" placeholder="f7f7f7"><br>
                text <input type="text" style="width:350px" name="ZEBB_text" value="<?=get_option('ZEBB_text')?get_option('ZEBB_text'):""?>" placeholder="文字を記入してください"><br>
                テキスト文字を未入力にすると電光掲示板が表示されません
                <?php submit_button(); ?>
            </form>
            <?php
        }
	);
}