Unable to resolve dependency for

这是一类问题,在导入第三方项目中出现的类似问题解决

Unable to resolve dependency for ':app@signingConfigs/compileClasspath': Could not resolve project :pulltorefresh.

Could not resolve project :pulltorefresh.
Required by:
    project :app
 > Unable to find a matching configuration of project :pulltorefresh:
     - Configuration 'debugApiElements':
         - Required com.android.build.api.attributes.BuildTypeAttr 'signingConfigs' and found incompatible value 'debug'.
         - Required com.android.build.gradle.internal.dependency.AndroidTypeAttr 'Aar' and found compatible value 'Aar'.
         - Found com.android.build.gradle.internal.dependency.VariantAttr 'debug' but wasn't required.
         - Required org.gradle.api.attributes.Usage 'java-api' and found compatible value 'java-api'.
     - Configuration 'debugRuntimeElements':
         - Required com.android.build.api.attributes.BuildTypeAttr 'signingConfigs' and found incompatible value 'debug'.
         - Required com.android.build.gradle.internal.dependency.AndroidTypeAttr 'Aar' and found compatible value 'Aar'.
         - Found com.android.build.gradle.internal.dependency.VariantAttr 'debug' but wasn't required.
         - Required org.gradle.api.attributes.Usage 'java-api' and found incompatible value 'java-runtime'.
     - Configuration 'releaseApiElements':
         - Required com.android.build.api.attributes.BuildTypeAttr 'signingConfigs' and found incompatible value 'release'.
         - Required com.android.build.gradle.internal.dependency.AndroidTypeAttr 'Aar' and found compatible value 'Aar'.
         - Found com.android.build.gradle.internal.dependency.VariantAttr 'release' but wasn't required.
         - Required org.gradle.api.attributes.Usage 'java-api' and found compatible value 'java-api'.
     - Configuration 'releaseRuntimeElements':
         - Required com.android.build.api.attributes.BuildTypeAttr 'signingConfigs' and found incompatible value 'release'.
         - Required com.android.build.gradle.internal.dependency.AndroidTypeAttr 'Aar' and found compatible value 'Aar'.
         - Found com.android.build.gradle.internal.dependency.VariantAttr 'release' but wasn't required.
         - Required org.gradle.api.attributes.Usage 'java-api' and found incompatible value 'java-runtime'.

这是错误的详细内容展开,百度后找到解决方法:
将app下的build.gradle中 buildTypes {}中的内容基本一致,有什么字段就都要有什么,例如app下build.gradle中都有这些内容:

 buildTypes {
        release {
            minifyEnabled false
            signingConfig signingConfigs.debug
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }

        signingConfigs {
            debug {
                storeFile file('debug.keystore')
                storePassword "android"
                keyAlias "androiddebugkey"
                keyPassword "android"
            }
        }
    }

而导入的pulltorefresh中的gradle可能只有这些内容

    buildTypes {
        release {
            minifyEnabled false
            signingConfig signingConfigs.debug
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
}

将singingConfigs直接粘贴复制过来问题即可解决.