com.google.android.material.tabs.TabLayout类错误

我添加了我的xml代码,任何人都可以帮助弄清楚我做错了什么.

以下是我得到的错误日志

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.vvdntech.design_material/com.example.vvdntech.design_material.LoggedIn}: android.view.InflateException: Binary XML file line #16: Binary XML file line #16: Error inflating class com.google.android.material.tabs.TabLayout
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2667)
    at android.app.ActivityThread.-wrap11(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1494)
    at android.os.Handler.dispatchMessage(Handler.java:111)
    at android.os.Looper.loop(Looper.java:207)
    at android.app.ActivityThread.main(ActivityThread.java:5776)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)
 Caused by: android.view.InflateException: Binary XML file line #16: Binary XML file line #16: Error inflating class com.google.android.material.tabs.TabLayout
    at android.view.LayoutInflater.inflate(LayoutInflater.java:539)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
    at android.support.v7.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:467)
    at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
    at com.example.vvdntech.design_material.LoggedIn.onCreate(LoggedIn.java:17)
    at android.app.Activity.performCreate(Activity.java:6582)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1113)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2532)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2667) 
    at android.app.ActivityThread.-wrap11(ActivityThread.java) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1494) 
    at android.os.Handler.dispatchMessage(Handler.java:111) 
    at android.os.Looper.loop(Looper.java:207) 
    at android.app.ActivityThread.main(ActivityThread.java:5776) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679) 
 Caused by: android.view.InflateException: Binary XML file line #16: Error inflating class com.google.android.material.tabs.TabLayout
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:776)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
    at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:838)
    at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
    at android.view.LayoutInflater.inflate(LayoutInflater.java:374) 
    at android.support.v7.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:467) 
    at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140) 
    at com.example.vvdntech.design_material.LoggedIn.onCreate(LoggedIn.java:17) 
    at android.app.Activity.performCreate(Activity.java:6582) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679) 
 Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.material.tabs.TabLayout" on path: DexPathList[[zip file "/data/app/com.example.vvdntech.design_material-1/base.apk", zip file "/data/app/com.example.vvdntech.design_material-1/split_lib_dependencies_apk.apk", 

这是我的xml文件

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".LoggedIn">


    <android.support.v4.view.ViewPager
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/pager">

        <com.google.android.material.tabs.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <com.google.android.material.tabs.TabItem
                android:icon="@drawable/b"
                android:text="tab1" />
            <com.google.android.material.tabs.TabItem
                android:icon="@drawable/b"
                android:text="tab2"/>
            <com.google.android.material.tabs.TabItem
                android:icon="@drawable/b"
                android:text="tab3"/>

        </com.google.android.material.tabs.TabLayout>

    </android.support.v4.view.ViewPager>

</RelativeLayout>

主要活动我尚未添加任何内容.这完全是练习,所以如果代码中有任何小错误,请告诉.

编辑：我也附上我的gradle文件

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.example.vvdntech.design_material"
        minSdkVersion 19
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.android.support:design:28.0.0-alpha3'
}

&安培; https://material.io/develop/android/components/tab-layout/我正在使用此链接,其中选项卡位于视图寻呼机内.

thnx提前

dependencies {
    // ...
    implementation 'com.google.android.material:material:1.0.0-beta01'
    // ...
}

参考https://github.com/material-components/material-components-android/blob/master/docs/getting-started.md

我不确定为什么Android reference documentation描述了使用Material Components而没有明确提到在该部分的任何地方找到它的位置.