Android studio 无法识别旧版本的 gradle 文件

Question

我正在尝试打开一个我很久以前使用 android studio 创建和开发的项目。但是每次我尝试打开并运行该项目时，我都会收到以下错误。该项目正常工作，gradle文件中没有任何错误。 请告诉我如何解决它

错误：

ERROR: Failed to resolve: com.android.support:appcompat-v7:26.0.1
Add Google Maven repository and sync project
Show in Project Structure dialog
Affected Modules: app


ERROR: Failed to resolve: com.android.support:recyclerview-v7:26.0.1
Add Google Maven repository and sync project
Show in Project Structure dialog
Affected Modules: app


ERROR: Failed to resolve: com.android.support:support-annotations:28.0.0
Add Google Maven repository and sync project
Show in Project Structure dialog
Affected Modules: app


WARNING: Configuration 'compile' is obsolete and has been replaced with 'implementation' and 'api'.
It will be removed at the end of 2018. For more information see: http://d.android.com/r/tools/update-dependency-configurations.html
Affected Modules: app


WARNING: Configuration 'testCompile' is obsolete and has been replaced with 'testImplementation'.
It will be removed at the end of 2018. For more information see: http://d.android.com/r/tools/update-dependency-configurations.html
Affected Modules: app


WARNING: Configuration 'androidTestCompile' is obsolete and has been replaced with 'androidTestImplementation'.
It will be removed at the end of 2018. For more information see: http://d.android.com/r/tools/update-dependency-configurations.html
Affected Modules: app


WARNING: The specified Android SDK Build Tools version (26.0.2) is ignored, as it is below the minimum supported version (28.0.3) for Android Gradle Plugin 3.3.2.
Android SDK Build Tools 28.0.3 will be used.
To suppress this warning, remove "buildToolsVersion '26.0.2'" from your build.gradle file, as each version of the Android Gradle Plugin now has a default version of the build tools.
Remove Build Tools version and sync project
Affected Modules: app

gradle 项目：

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

buildscript {
    repositories {
        jcenter()

        maven {
            url 'https://github.com/uPhyca/stetho-realm/raw/master/maven-repo'

        }
        maven {
            url "https://jitpack.io"
        }
        google()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.3.2'

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

allprojects {
    repositories {
        jcenter()
    }
}

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

gradle 应用程序：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.2"
    defaultConfig {
        applicationId "com.example.pc_amr.retrofit_3"
        minSdkVersion 15
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:26.0.1'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'
    compile 'com.squareup.okhttp3:logging-interceptor:3.4.0'
    compile 'com.squareup.retrofit2:retrofit:2.3.0'
    compile 'com.squareup.retrofit2:converter-gson:2.1.0'
    compile 'com.squareup:otto:1.3.8'
    compile 'com.google.code.gson:gson:2.6.2'
    compile 'com.android.support:recyclerview-v7:26.0.1'
    compile 'com.squareup.okhttp3:okhttp:3.9.0'
    compile 'com.google.code.gson:gson:2.8.1'
    compile 'com.solidfire.code.gson:gson:2.6.2'
    compile 'com.google.code.gson:gson-parent:2.8.1'
    compile 'com.solidfire.code.gson:gson-parent:2.6.2'
    compile 'com.android.support:support-annotations:28.0.0'
}

Answer 1

Maven仓库丢失，所以在项目级别gradle文件中进行如下操作

allprojects {
    repositories {
        // If you're using a version of Gradle lower than 4.1, you must instead use:
        maven {
            url 'https://maven.google.com'
        }
        // An alternative URL is 'https://dl.google.com/dl/android/maven2/'

       jcenter()
    }
}