Question

Android Studio突然显示此错误can not resolve symbol R 这是我的build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.galiyara.sandy.galiyara"
        minSdkVersion 23
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
        }
    }
    compileOptions {
        targetCompatibility 1.8
        sourceCompatibility 1.8
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support:recyclerview-v7:28.0.0'
    implementation 'com.android.support:recyclerview-selection:28.0.0'
    implementation 'com.android.support:cardview-v7:28.0.0'
    implementation 'com.android.support:design:28.0.0'
    implementation 'com.android.support:support-v4:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.github.chrisbanes:PhotoView:2.0.0'
    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.github.bumptech.glide:glide:4.8.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.8.0'
    implementation 'com.android.support:exifinterface:28.0.0'
    implementation 'com.theartofdev.edmodo:android-image-cropper:2.7.0'
}

和

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {

    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.3.1'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        maven {
            url "https://jitpack.io"
        }
    }
}

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

Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.galiyara.sandy.galiyara">
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.SET_WALLPAPER"/>

    <application
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true"
            android:theme="@style/AppTheme">

        <provider
                android:name="android.support.v4.content.FileProvider"
                android:authorities="com.galiyara.sandy.galiyara.provider"
                android:exported="false"
                android:grantUriPermissions="true">
            <meta-data
                    android:name="android.support.FILE_PROVIDER_PATHS"
                    android:resource="@xml/paths"/>
        </provider>

        <!-- Main activity -->
        <activity
                android:name=".MainActivity"
                android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>

            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>
        </activity>
        <!-- Albums activity -->
        <activity android:name=".AlbumsActivity"/>
        <!-- Image view activity -->
        <activity android:name=".ImageViewActivity"/>
        <!-- Image cropper activity -->
        <activity android:name="com.theartofdev.edmodo.cropper.CropImageActivity"
                  android:theme="@style/Base.Theme.AppCompat"/>
    </application>

</manifest>

Answer 1

转到文件 > 设置 > 投标，执行，部署 > 成绩

检查 Gradle Home 是否具有最新版本 gradle-4.10.1 。

D:/Gradle/.gradle/wrapper/dists/gradle-4.10.1-all/byrf7c6xk4p2imgx1wxxfgf3t/gradle-4.10.1

Answer 2

添加buildToolsVersion '28.0.3'

＆将顶级gradle文件更新为：

dependencies { classpath 'com.android.tools.build:gradle:3.5.0-alpha02' }

在库下面更新

implementation 'com.github.chrisbanes:PhotoView:2.0.0'
implementation 'com.theartofdev.edmodo:android-image-cropper:2.7.0'

无法解析intellijIdea中的符号R

2 个答案: