Theme Error - how to fix?

问题

Tried Many Solution But No Helped

Ref : Failed to find style 'coordinatorLayoutStyle' in current theme

But not Helped

Render Problem:

Failed to find style 'coordinatorLayoutStyle' in current theme

Tip: Try to refresh the layout.

build.gradle file of my project is :

buildscript {

repositories {
    google()
    jcenter()
}
dependencies {
    classpath 'com.android.tools.build:gradle:3.1.4'


    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

module:app

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "*****"
        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(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0-alpha1'
    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-alpha1'
}

main Activity XML code

    <?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    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=".MainActivity">

    <android.support.design.bottomappbar.BottomAppBar
        android:id="@+id/bar"
        style="@style/Widget.MaterialComponents.BottomAppBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        app:navigationIcon="@drawable/ic_menu"
        app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
        app:fabAttached="true"
        app:backgroundTint="@color/colorPrimary"
        app:fabCradleVerticalOffset="12dp"/>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_anchor="@id/bar"/>

</android.support.design.widget.CoordinatorLayout>

Why I am Not changing compiled SDK version 28 to 27 bcz I want to use Bottom app bar

Bottom App Bar Material Design

App Bars:Bottom- Material Design

回答1:

This is a bug in 28.0.0 and the only fix(workaround) is adding this to your Build.gradle:

configurations.all {
        resolutionStrategy.eachDependency { DependencyResolveDetails details ->
            def requested = details.requested
            if (requested.group == "com.android.support") {
                if (!requested.name.startsWith("multidex")) {
                    details.useVersion "27.1.1"
                }
            }
        }
    }

Which somehow, this bypasses the issue and uses 27 support library for that. Otherwise, you may wanna update your Android Studio to canary channel version or using backward support library like 27.1.1 or etc.

回答2:

This error was occurred in your Rendering Layout which is a part of Studio Not in any files or Library

1. Try adding "Base" before Theme in styles.xml as show : - "Base.Theme.AppCompat.Light.DarkActionBar"

2. Please restart Android Studio by selecting the menu option "File" → "Invalidate Caches / Restart"

3. Workarounds: Try rendering with M preview using AS v1.3 preview OR use FrameLayout for designing and change to android.support.design.widget.CoordinatorLayout while debugging.

来源：https://stackoverflow.com/questions/52017363/theme-error-how-to-fix