getWidth                  : 返回根据屏幕宽适配后尺寸.
getHeight                 : 返回根据屏幕高适配后尺寸.
getWidthPx                : 返回根据屏幕宽适配后尺寸.
getHeightPx               : 返回根据屏幕高适配后尺寸.
getSp                     : 返回根据屏幕宽适配后字体尺寸.
screenWidth               : 获取屏幕宽.
screenHeight              : 获取屏幕高.
screenDensity             : 获取屏幕密度.
appBarHeight              : 获取系统AppBar高度.
statusBarHeight           : 获取系统状态栏高度.
getScreenW(ctx)           : 当前屏幕 宽.
getScreenH(ctx)           : 当前屏幕 高.
getStatusBarH(ctx)        : 当前状态栏高度.
getBottomBarH(ctx)        : 当前BottomBar高度.
getScaleW(ctx,size)       : 返回根据屏幕宽适配后尺寸.
getScaleH(ctx,size)       : 返回根据屏幕高适配后尺寸.
getScaleSp(ctx,size)      : 返回根据屏幕宽适配后字体尺寸.  
getScaleSp(ctx,size)      : 返回根据屏幕宽适配后字体尺寸.  

///旧适配方法仅适用于纵屏适配。
///推荐使用以下新适配方法。
getAdapterSize(size)             : 返回适配后尺寸，可用于宽，高，字体尺寸.  
getAdapterSizeCtx(ctx,size)      : 返回适配后尺寸，可用于宽，高，字体尺寸.   

double adapterSize = ScreenUtil.getInstance().getAdapterSize(100);
double adapterSize = ScreenUtil.getAdapterSizeCtx(context, 100);
  
一、不依赖context
// 屏幕宽
double screenWidth = ScreenUtil.getInstance().screenWidth;
// 屏幕高
double screenHeight = ScreenUtil.getInstance().screenHeight;
// 屏幕像素密度
double screenDensity = ScreenUtil.getInstance().screenDensity;
// 系统状态栏高度
double statusBarHeight = ScreenUtil.getInstance().statusBarHeight;
// BottomBar高度 
double bottomBarHeight = ScreenUtil.getInstance().bottomBarHeight;
// 系统AppBar高度
double appBarHeight = ScreenUtil.getInstance().appBarHeight;
// 根据屏幕宽适配后尺寸
double adapterW100 = ScreenUtil.getInstance().getWidth(100);
// 根据屏幕高适配后尺寸
double adapterH100 = ScreenUtil.getInstance().getHeight(100);
// 根据屏幕宽适配后字体尺寸
double adapterSp100 = ScreenUtil.getInstance().getSp(100);
// 根据屏幕宽适配后尺寸(输入px)
double adapterW100px = ScreenUtil.getInstance().getWidthPx(300);
// 根据屏幕高适配后尺寸(输入px)
double adapterH100px = ScreenUtil.getInstance().getHeightPx(300);
  
二、依赖context
// 屏幕宽
double screenWidth = ScreenUtil.getScreenW(context);
// 屏幕高
double screenHeight = ScreenUtil.getScreenH(context);
// 屏幕像素密度
double screenDensity = ScreenUtil.getScreenDensity(context);
// 系统状态栏高度
double statusBarHeight = ScreenUtil.getStatusBarH(context);
// BottomBar高度
double bottomBarHeight = ScreenUtil.getBottomBarH(context);
// 根据屏幕宽适配后尺寸
double adapterW100 = ScreenUtil.getScaleW(context, 100);
// 根据屏幕高适配后尺寸
double adapterH100 = ScreenUtil.getScaleH(context, 100);
// 根据屏幕宽适配后字体尺寸
double adapterSp100 = ScreenUtil.getScaleSp(context, 100);
// 屏幕方向
Orientation orientation = ScreenUtil.getOrientation(context);

setInitDir
initTempDir
initAppDocDir
initAppSupportDir
initStorageDir
createDirSync
createDir
getTempPath
getAppDocPath
getAppSupportPath
getStoragePath
createTempDirSync
createAppDocDirSync
createStorageDirSync
createTempDir
createAppDocDir
createStorageDir

    await DirectoryUtil.getInstance();
    String tempPath = DirectoryUtil.getTempPath(
        category: 'Pictures', fileName: 'demo', format: 'png');
    print("thll  tempPath: $tempPath");

    String appDocPath = DirectoryUtil.getAppDocPath(
        category: 'Pictures', fileName: 'demo', format: 'png');
    print("thll  appDocPath: $appDocPath");

    String appSupportPath = DirectoryUtil.getAppSupportPath(
        category: 'Pictures', fileName: 'demo', format: 'png');
    print("thll  appSupportPath: $appSupportPath");

    String storagePath = DirectoryUtil.getStoragePath(
        category: 'Pictures', fileName: 'demo', format: 'png');
    print("thll  storagePath: $storagePath");

asyncPrepare              : Widget渲染监听，监听widget宽高变化,callback返回宽高等参数.
getWidgetBounds           : 获取widget 宽高.
getWidgetLocalToGlobal    : 获取widget在屏幕上的坐标.
getImageWH                : 获取图片宽高，加载错误情况返回 Rect.zero.（单位 px）. 
getImageWHE               : 获取图片宽高，加载错误会抛出异常.（单位 px）. 

/// widget渲染监听。
WidgetUtil widgetUtil = new WidgetUtil();
widgetUtil.asyncPrepare(context, true, (Rect rect) {
  // widget渲染完成。
});

/// widget宽高。
Rect rect = WidgetUtil.getWidgetBounds(context);

/// widget在屏幕上的坐标。
Offset offset = WidgetUtil.getWidgetLocalToGlobal(context);
  
/// 获取CachedNetworkImage下的图片尺寸
Image image = new Image(image: new CachedNetworkImageProvider("Url"));
Rect rect1 = await WidgetUtil.getImageWH(image: image);  

/// 其他image
Image imageAsset = new Image.asset("");
Image imageFile = new Image.file(File("path"));
Image imageNetwork = new Image.network("url");
Image imageMemory = new Image.memory(null);

/// 获取网络图片尺寸
Rect rect2 = await WidgetUtil.getImageWH(url: "Url");

/// 获取本地图片尺寸 localUrl 需要全路径
Rect rect3 = await WidgetUtil.getImageWH(localUrl: "assets/images/3.0x/ali_connors.png");

/// 其他方式
WidgetUtil.getImageWH(url: "Url").then((Rect rect) {
  print("rect: " + rect.toString();
});

WidgetUtil.getImageWHE(url: "Url").then((Rect rect) {
  print("rect: " + rect.toString();
}).catchError((error) {
  print("rect: " + error.toString();
});

// 打开debug模式.
DioUtil.openDebug(); 

// 配置网络参数.
Options options = DioUtil.getDefOptions();
options.baseUrl = "http://www.wanandroid.com/";
HttpConfig config = new HttpConfig(options: options);
DioUtil().setConfig(config);
  
// 两种单例请求方式.
DioUtil().request<List>(Method.get, "banner/json");
DioUtil.getInstance().request(Method.get, "banner/json");
  
//示例
LoginReq req = new LoginReq('username', 'password');
DioUtil().request(Method.post, "user/login",data: req.toJson());
  
//示例
FormData formData = new FormData.from({
      "username": "username",
      "password": "password",
    });
DioUtil().requestR(Method.post, "user/login",data: rformData);
  
// 网络请求日志  
I/flutter ( 5922): ----------------Http Log----------------
I/flutter ( 5922): [statusCode]:   200
I/flutter ( 5922): [request   ]:   method: GET  baseUrl: http://www.wanandroid.com/  path: lg/collect/list/0/json
I/flutter ( 5922): [reqdata   ]:   null
I/flutter ( 5922): [response  ]:   {data: {curPage: 1, datas: [], offset: 0, over: true, pageCount: 0, size: 20, total: 0}, errorCode: 0, errorMsg: }