无法将 Firebase 添加到 2 个模块的 LibGDX 项目中

Question

我一直在尝试将Firebase数据库添加到使用LibGDX的学校项目中。它有 2 个子项目模块："核心"和"安卓"。

当尝试将com.google.firebase：firebase-database实现到我的gradle文件中时，我只能从"android"模块访问Firebase函数，该模块基本上没有代码。当我在core/build.gradle中编译库时，我收到此错误：模块依赖于一个或多个Android库，但是一个jar。

我尝试使用所有其他实现Firebase的库，但没有取得多大成功。我在底部包含了我的gradle代码。

谢谢！！

这是我的成绩代码：

core/build.gradle

apply plugin: "java"
sourceCompatibility = 1.6
[compileJava, compileTestJava]*.options*.encoding = 'UTF-8'
sourceSets.main.java.srcDirs = [ "src/" ]

eclipse.project {
name = appName + "-core"
}
dependencies{
compile "de.tomgrill.gdxfirebase:gdx-firebase-android:0.0.4-SNAPSHOT"
}
apply plugin: 'com.google.gms.google-services'

project/build.gradle

buildscript {

repositories {
mavenLocal()
mavenCentral()
maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.3.3'
classpath 'com.google.gms:google-services:3.2.1'
}
}
allprojects {
apply plugin: "eclipse"
apply plugin: "idea"
version = '1.0'
ext {
appName = "mygame"
gdxVersion = '1.9.7'
roboVMVersion = '2.3.1'
box2DLightsVersion = '1.4'
ashleyVersion = '1.7.0'
aiVersion = '1.8.0'
}
repositories {
mavenLocal()
mavenCentral()
maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
maven { url "https://oss.sonatype.org/content/repositories/releases/" }
maven { url "https://maven.google.com" }
}
}
project(":android") {
apply plugin: "android"
configurations { natives }
dependencies {
compile project(":core")
compile "com.badlogicgames.gdx:gdx-backend-android:$gdxVersion"
natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-armeabi"
natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-armeabi-v7a"
natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-arm64-v8a"
natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-x86"
natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-x86_64"
compile "com.badlogicgames.gdx:gdx-box2d:$gdxVersion"
natives "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-armeabi"
natives "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-armeabi-v7a"
natives "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-arm64-v8a"
natives "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-x86"
natives "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-x86_64"
}
}
project(":core") {
apply plugin: "java"

dependencies {
compile "com.badlogicgames.gdx:gdx:$gdxVersion"
compile "com.badlogicgames.gdx:gdx-box2d:$gdxVersion"
compile "net.dermetfan.libgdx-utils:libgdx-utils-box2d:0.13.4"
compile "net.dermetfan.libgdx-utils:libgdx-utils:0.13.4"
}
}
tasks.eclipse.doLast {
delete ".project"
}

android/build.gradle

android {
buildToolsVersion "26.0.2"
compileSdkVersion 23
sourceSets {
main {
manifest.srcFile 'AndroidManifest.xml'
java.srcDirs = ['src']
aidl.srcDirs = ['src']
renderscript.srcDirs = ['src']
res.srcDirs = ['res']
assets.srcDirs = ['assets']
jniLibs.srcDirs = ['libs']
}
instrumentTest.setRoot('tests')
}
packagingOptions {
exclude 'META-INF/robovm/ios/robovm.xml'
}
defaultConfig {
applicationId "com.extelite.mygame"
minSdkVersion 15
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}

// called every time gradle gets executed, takes the native dependencies of
// the natives configuration, and extracts them to the proper libs/ folders
// so they get packed with the APK.
task copyAndroidNatives() { 
file("libs/armeabi/").mkdirs();
file("libs/armeabi-v7a/").mkdirs();
file("libs/arm64-v8a/").mkdirs();
file("libs/x86_64/").mkdirs();
file("libs/x86/").mkdirs();
configurations.natives.files.each { jar ->
def outputDir = null
if(jar.name.endsWith("natives-arm64-v8a.jar")) outputDir = file("libs/arm64-v8a")
if(jar.name.endsWith("natives-armeabi-v7a.jar")) outputDir = file("libs/armeabi-v7a")        
if(jar.name.endsWith("natives-armeabi.jar")) outputDir = file("libs/armeabi")
if(jar.name.endsWith("natives-x86_64.jar")) outputDir = file("libs/x86_64")
if(jar.name.endsWith("natives-x86.jar")) outputDir = file("libs/x86")
if(outputDir != null) {
copy {
from zipTree(jar)
into outputDir
include "*.so"
}
}
}
}
task run(type: Exec) {
def path
def localProperties = project.file("../local.properties")
if (localProperties.exists()) {
Properties properties = new Properties()
localProperties.withInputStream { instr ->
properties.load(instr)
}
def sdkDir = properties.getProperty('sdk.dir')
if (sdkDir) {
path = sdkDir
} else {
path = "$System.env.ANDROID_HOME"
}
} else {
path = "$System.env.ANDROID_HOME"
}
def adb = path + "/platform-tools/adb"
commandLine "$adb", 'shell', 'am', 'start', '-n', 'com.extelite.mygame/com.extelite.mygame.AndroidLauncher'
}
// sets up the Android Eclipse project, using the old Ant based build.
eclipse {
// need to specify Java source sets explicitly, SpringSource Gradle Eclipse plugin
// ignores any nodes added in classpath.file.withXml
sourceSets {
main {
java.srcDirs "src", 'gen'
}
}
jdt {
sourceCompatibility = 1.6
targetCompatibility = 1.6
}
classpath {
plusConfigurations += [ project.configurations.compile ]        
containers 'com.android.ide.eclipse.adt.ANDROID_FRAMEWORK', 'com.android.ide.eclipse.adt.LIBRARIES'       
}
project {
name = appName + "-android"
natures 'com.android.ide.eclipse.adt.AndroidNature'
buildCommands.clear();
buildCommand "com.android.ide.eclipse.adt.ResourceManagerBuilder"
buildCommand "com.android.ide.eclipse.adt.PreCompilerBuilder"
buildCommand "org.eclipse.jdt.core.javabuilder"
buildCommand "com.android.ide.eclipse.adt.ApkBuilder"
}
}
// sets up the Android Idea project, using the old Ant based build.
idea {
module {
sourceDirs += file("src");
scopes = [ COMPILE: [plus:[project.configurations.compile]]]        
iml {
withXml {
def node = it.asNode()
def builder = NodeBuilder.newInstance();
builder.current = node;
builder.component(name: "FacetManager") {
facet(type: "android", name: "Android") {
configuration {
option(name: "UPDATE_PROPERTY_FILES", value:"true")
}
}
}
}
}
}
}
dependencies {
compile 'com.google.firebase:firebase-core:15.0.2'
}
apply plugin 'com.google.gms.google-services'

Answer 1

Firebase是与平台相关的库。它对Android和IOS操作系统有不同的实现。核心模块应仅包含通用业务逻辑，但您可以在此模块中创建MyDatabase接口，并在某些平台中单独实现它。

首先，您需要在核心模块中创建用于MyDatabase实现的 holder 类：

public class MyDatabaseHolder {
private static MyDatabase DB;
public static void setDb(MyDatabase db) {
DB = db;
}
public static MyDatabase getDb(MyDatabase db) {
return DB;
}
public interface MyDatabase {
void saveString(String string);
}
}

现在您可以使用它来访问核心模块中的MyDatabase实例：

public class MyCoreClass {
public void test() {
MyDatabaseHolder.getDb().saveString("It works!");
}
}

MyDatabase和初始化MyDatabaseHolder的实现将在Android(或IOS(模块中：

实现：

public class AndroidDatabase implements MyDatabase {
@Override
public void saveString(String string) {
// here you have access to Firebase API
}
}

初始化：

public class AndroidLauncher extends AndroidApplication {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MyDatabaseHolder.setDb(new AndroidDatabase());
}
}