最近更新了Android Studio 到最新版本3.1.4,但是却出现了一个问题,
Cannot resolve symbol ‘Theme’ in styles.xml (Android Studio)
Failed to load AppCompat ActionBar with unknown error.
Cannot resolve symbol ‘OkhttpUtils’
…
有时候会出现类似theme主题找不到,甚至AppCompatActivity 这个类也找不到,
更严重有时候引入的所有Github 上的类库都找不到了,都快要吐血崩溃了。
好在经过 一番苦战,终于摸清楚了脾气,找到了终极解决方案。
1.哪个Jar包有问题就把该配置注释掉,比如下面这个:
dependencies {
//implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
//implementation 'com.android.support:design:28.0.0-alpha3'
//implementation 'com.android.support:support-v4:28.0.0-alpha3'
//implementation 'com.android.support:recyclerview-v7:28.0.0-alpha3'
}
dependencies {
implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
implementation 'com.android.support:design:28.0.0-alpha3'
implementation 'com.android.support:support-v4:28.0.0-alpha3'
implementation 'com.android.support:recyclerview-v7:28.0.0-alpha3'
}
implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
为
implementation 'com.android.support:appcompat-v7:28.0.0-alpha1'
完整修改build.gradle内容如下:
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0-alpha1'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
implementation 'com.android.support:design:28.0.0-alpha1'
implementation 'com.android.support:support-v4:28.0.0-alpha1'
implementation 'com.android.support:recyclerview-v7:28.0.0-alpha1'
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'
}
参考地址:After Updating Android studio to 3.1.2 , I get “Failed to load AppCompat ActionBar with unknown error. ”
也有可能是jar包因为网络原因没下载更新好。。。
删除这个文件夹下的所有jar,或者找到没识别的jar删除再重新下载
/Users/(用户名)/.gradle/
// 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:3.1.4'
// 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' }
}
}
1.哪个Jar包有问题就把该配置注释掉,比如下面这个:
dependencies {
//implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
//implementation 'com.android.support:design:28.0.0-alpha3'
//implementation 'com.android.support:support-v4:28.0.0-alpha3'
//implementation 'com.android.support:recyclerview-v7:28.0.0-alpha3'
}
dependencies {
implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
implementation 'com.android.support:design:28.0.0-alpha3'
implementation 'com.android.support:support-v4:28.0.0-alpha3'
implementation 'com.android.support:recyclerview-v7:28.0.0-alpha3'
}