Android Studio 手动搭建LibGDX for Android环境

想用AS开发LibGdx，因为官方自带的Gdx-setup创建的工程实在太难导入，于是自己动手建一个工程。
工程目录如下：

整个工程的build.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:3.6.0'


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

allprojects {
    repositories {
        google()
        jcenter()

    }
}

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

Android的build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.3"

    defaultConfig {
        applicationId "com.end.of.sea"
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

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

}


dependencies {
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    implementation files('libs/gdx-backend-android.jar')
    implementation project(path: ':gdx-game')
}

gdx-game

apply plugin: 'java-library'

dependencies {
    implementation files('libs/gdx.jar')
    implementation files('libs/gdx-backend-gwt.jar')
    implementation files('libs/gdx-backend-lwjgl.jar')
    implementation files('libs/gdx-backend-lwjgl-natives.jar')
    implementation files('libs/gdx-natives.jar')
    implementation files('libs/gdx-freetype.jar')
    implementation files('libs/gdx-freetype-natives.jar')
}

sourceCompatibility = "7"
targetCompatibility = "7"

如果将MainActivity继承AndroidApplication启动游戏的话，就会出现下面的错误。

网上那些换字体和编码试过都没用。