0 
<android.support.design.widget.BottomNavigationView
        android:id="@+id/navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        design:menu="@menu/bottom_menu_bar" />

应用程序级别的gradle。

buildscript {
    repositories {
        maven { url 'https://maven.fabric.io/public' }
    }

    dependencies {
        classpath 'io.fabric.tools:gradle:1.+'
    }
}
apply plugin: 'com.android.application'
apply plugin: 'io.fabric'

repositories {
    maven { url 'https://maven.fabric.io/public' }
}


android {
    compileSdkVersion 25
    buildToolsVersion "25.0.0"
    useLibrary 'org.apache.http.legacy'

     /*splits {
         abi {
             enable true
             reset()
             include 'x86', 'x86_64', 'armeabi', 'armeabi-v7a', 'arm64-v8a', 'mips'
             universalApk false
         }
     }*/
    defaultConfig {
        applicationId "user.com.hlthee"
        minSdkVersion 17
        targetSdkVersion 25
        versionCode 2
        versionName "1.0.1"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            debuggable false
            minifyEnabled true
            shrinkResources true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            debuggable true
            minifyEnabled true
            shrinkResources true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    sourceSets {
        main {
            assets.srcDirs = ['src/main/assets', 'src/main/assets/']
            res.srcDirs = ['src/main/res', 'src/main/assets/fonts']
        }
    }

    dexOptions {
        jumboMode true
    }

    packagingOptions {
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/ECLIPSE_.SF'
        exclude 'META-INF/ECLIPSE_.RSA'
    }
}

主题

 <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="android:background">@color/primary_background</item>
        <item name="background">@color/primary_background</item>
        <item name="android:colorPrimaryDark">@color/primary_background</item>
        <item name="colorPrimaryDark">@color/primary_background</item>
        <item name="android:navigationBarColor">@color/primary_background</item>
        <item name="android:alertDialogTheme">@style/myDialog</item>
        <item name="android:datePickerDialogTheme">@style/myDatePickertheme</item>
        <item name="android:itemTextAppearance">@style/itemTextStyle.AppTheme</item>
        <item name="itemTextAppearance">@style/itemTextStyle.AppTheme</item>
    </style>

它在大于或等于 21 的 api 级别上工作得很好，但在 kitkat 中不起作用。我什至尝试过使用其他库，但输出是相同的。我确切地知道我的代码有什么问题。

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