Angular NullInjectorError:没有MediaMatcher的提供程序

我正在使用Angular 5和AngularMaterial2

尝试注入MediaMatcher服务时出错

我有两个模块。用于应用程序引导的根模块，以及包含所有组件的主模块。我试着用一个响应性的侧面导航作为角度材料文档的例子

我想我缺少一个导入，但是我找不到模块是什么

这是我的密码：

AppModule:

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';

//Angular Module Dependencies
import { HttpClientModule } from '@angular/common/http'; 
import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';

//Root Module Imports
import { AppComponent } from './app.component';

//Feature Module Imports
import { AppRoutingModule } from './app-routing.module';
import { CoreModule  } from "./core-module/core.module";
import { MainModule } from './main-module/main.module';
import { FrontSession } from './core-module/services/front-session.service';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    //Dependencies
    HttpClientModule,
    BrowserModule,
    BrowserAnimationsModule,

    //Features
    CoreModule.forRoot({ devMode: true }),
    MainModule,
    AppRoutingModule
  ],
  exports: [
    ],  
  providers: [ ],
  bootstrap: [AppComponent]
})
export class AppModule { }

    import { NgModule } from '@angular/core';
    import { FormsModule, ReactiveFormsModule } from '@angular/forms';
    import { FlexLayoutModule } from '@angular/flex-layout';
    import { CommonModule } from '@angular/common';

    import { MatButtonModule, MatCardModule, MatFormFieldModule, MatInputModule, MatCheckboxModule, MatTableModule, MatSidenavModule, MatIconModule, MatToolbarModule, MatListModule } from '@angular/material'; 
    const matModules = [  MatButtonModule, MatCardModule, MatFormFieldModule, MatInputModule, MatCheckboxModule, MatTableModule, MatSidenavModule, MatIconModule, MatToolbarModule, MatListModule ];

    import { Home } from './states/home/home.component';
    import { Login } from './states/login/login.component';
    import { Signin } from './states/signin/signin.component';

    import { UserEdit } from './components/user-edit/user-edit.component';
    import { UserList } from './components/user-list/user-list.component';

    @NgModule({
      imports: [
        FormsModule,
        FlexLayoutModule,
        CommonModule,
        ReactiveFormsModule,
        matModules
      ],
      declarations: [ Home, Login, Signin, UserEdit, UserList ]
    })

    export class MainModule { }

import { Component, ChangeDetectorRef } from '@angular/core';
import { MediaMatcher } from '@angular/cdk/layout';


@Component( { 
    templateUrl: './home.html',
    styleUrls: ['./home.css'] 
})
export class Home 
{
    mobileQuery: MediaQueryList;



constructor(changeDetectorRef: ChangeDetectorRef, media: MediaMatcher){ }

   } 

main模块：

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';

//Angular Module Dependencies
import { HttpClientModule } from '@angular/common/http'; 
import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';

//Root Module Imports
import { AppComponent } from './app.component';

//Feature Module Imports
import { AppRoutingModule } from './app-routing.module';
import { CoreModule  } from "./core-module/core.module";
import { MainModule } from './main-module/main.module';
import { FrontSession } from './core-module/services/front-session.service';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    //Dependencies
    HttpClientModule,
    BrowserModule,
    BrowserAnimationsModule,

    //Features
    CoreModule.forRoot({ devMode: true }),
    MainModule,
    AppRoutingModule
  ],
  exports: [
    ],  
  providers: [ ],
  bootstrap: [AppComponent]
})
export class AppModule { }

    import { NgModule } from '@angular/core';
    import { FormsModule, ReactiveFormsModule } from '@angular/forms';
    import { FlexLayoutModule } from '@angular/flex-layout';
    import { CommonModule } from '@angular/common';

    import { MatButtonModule, MatCardModule, MatFormFieldModule, MatInputModule, MatCheckboxModule, MatTableModule, MatSidenavModule, MatIconModule, MatToolbarModule, MatListModule } from '@angular/material'; 
    const matModules = [  MatButtonModule, MatCardModule, MatFormFieldModule, MatInputModule, MatCheckboxModule, MatTableModule, MatSidenavModule, MatIconModule, MatToolbarModule, MatListModule ];

    import { Home } from './states/home/home.component';
    import { Login } from './states/login/login.component';
    import { Signin } from './states/signin/signin.component';

    import { UserEdit } from './components/user-edit/user-edit.component';
    import { UserList } from './components/user-list/user-list.component';

    @NgModule({
      imports: [
        FormsModule,
        FlexLayoutModule,
        CommonModule,
        ReactiveFormsModule,
        matModules
      ],
      declarations: [ Home, Login, Signin, UserEdit, UserList ]
    })

    export class MainModule { }

import { Component, ChangeDetectorRef } from '@angular/core';
import { MediaMatcher } from '@angular/cdk/layout';


@Component( { 
    templateUrl: './home.html',
    styleUrls: ['./home.css'] 
})
export class Home 
{
    mobileQuery: MediaQueryList;



constructor(changeDetectorRef: ChangeDetectorRef, media: MediaMatcher){ }

   } 

家庭组件：

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';

//Angular Module Dependencies
import { HttpClientModule } from '@angular/common/http'; 
import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';

//Root Module Imports
import { AppComponent } from './app.component';

//Feature Module Imports
import { AppRoutingModule } from './app-routing.module';
import { CoreModule  } from "./core-module/core.module";
import { MainModule } from './main-module/main.module';
import { FrontSession } from './core-module/services/front-session.service';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    //Dependencies
    HttpClientModule,
    BrowserModule,
    BrowserAnimationsModule,

    //Features
    CoreModule.forRoot({ devMode: true }),
    MainModule,
    AppRoutingModule
  ],
  exports: [
    ],  
  providers: [ ],
  bootstrap: [AppComponent]
})
export class AppModule { }

    import { NgModule } from '@angular/core';
    import { FormsModule, ReactiveFormsModule } from '@angular/forms';
    import { FlexLayoutModule } from '@angular/flex-layout';
    import { CommonModule } from '@angular/common';

    import { MatButtonModule, MatCardModule, MatFormFieldModule, MatInputModule, MatCheckboxModule, MatTableModule, MatSidenavModule, MatIconModule, MatToolbarModule, MatListModule } from '@angular/material'; 
    const matModules = [  MatButtonModule, MatCardModule, MatFormFieldModule, MatInputModule, MatCheckboxModule, MatTableModule, MatSidenavModule, MatIconModule, MatToolbarModule, MatListModule ];

    import { Home } from './states/home/home.component';
    import { Login } from './states/login/login.component';
    import { Signin } from './states/signin/signin.component';

    import { UserEdit } from './components/user-edit/user-edit.component';
    import { UserList } from './components/user-list/user-list.component';

    @NgModule({
      imports: [
        FormsModule,
        FlexLayoutModule,
        CommonModule,
        ReactiveFormsModule,
        matModules
      ],
      declarations: [ Home, Login, Signin, UserEdit, UserList ]
    })

    export class MainModule { }

import { Component, ChangeDetectorRef } from '@angular/core';
import { MediaMatcher } from '@angular/cdk/layout';


@Component( { 
    templateUrl: './home.html',
    styleUrls: ['./home.css'] 
})
export class Home 
{
    mobileQuery: MediaQueryList;



constructor(changeDetectorRef: ChangeDetectorRef, media: MediaMatcher){ }

   } 

---

您需要在

main模块中导入
LayoutModule
。
MediaMatcher
由模块提供

这将起作用，但您将提供该服务的另一个实例：

...,
providers: [
    MediaMatcher
],
...

您不必
提供它。顺便说一句，该属性实际上是
提供者
，而不是
提供
。从'@angular/cdk/layout'导入{LayoutModule}//然后将其添加到app@NgModule decorator的imports数组中。如果它的子模块是您在应用程序模块中进一步导入的，那么您也需要将其导出。