• 更新：在运行ProGuard以减少我的资源后，ProGuard似乎正在删除重要代码：错误：在org.gradle.api.Project类型的根项目“Google maps Demo”上找不到用于参数[build_7b52k4yyeks9l2efdeec28zeo$_run_closure2@6cc7c31f]的方法android（）。更新了build.gradle代码：

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

buildscript {
    repositories {
        google()
        jcenter()
        mavenLocal()

    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.0'
        classpath 'com.google.gms:google-services:4.3.2'

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

allprojects {
    repositories {
        google()
        jcenter()
        maven { url 'https://maven.fabric.io/public' }
        maven {
            url "https://maven.google.com"
        }
    }
}

android {
    buildTypes {
        release {
            // Enables code shrinking, obfuscation, and optimization for only
            // your project's release build type.
            minifyEnabled true

            // Enables resource shrinking, which is performed by the
            // Android Gradle plugin.
            shrinkResources true

            // Includes the default ProGuard rules files that are packaged with
            // the Android Gradle plugin. To learn more, go to the section about
            // R8 configuration files.
            proguardFiles getDefaultProguardFile(
                    'proguard-android-optimize.txt'),
                    'proguard-rules.pro'
        }
    }

}

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

我正在使用android studio来实现谷歌MapAPI使用Android的编码的教程（https://www.youtube.com/watch?v=eiexkzCI8m8）.我得到这个错误作为一个“D8错误”和两个错误在我的Java编译器.错误#1：“引起：：com.android.tools.r8.CompilationFailedException：编译无法完成”
错误#2：“原因：com.android.tools.r8.utils.AbortException:错误：null，无法在单个dex文件中容纳请求的类（# methods：86965〉65536）”
有人看到问题了吗？
下面是我的java代码：

public class MainActivity extends FragmentActivity implements OnMapReadyCallback{

    GoogleMap map;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        map = googleMap;

        LatLng Brockton = new LatLng(42.0895988,-70.9798322);
        map.addMarker(new MarkerOptions().position(Brockton).title("Brockton"));
        map.moveCamera(CameraUpdateFactory.newLatLng(Brockton));
    }
}