Init project.

android/README.md

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+README
+======
+
+If you want to publish the lib as a maven dependency, follow these steps before publishing a new version to npm:
+
+1. Be sure to have the Android [SDK](https://developer.android.com/studio/index.html) and [NDK](https://developer.android.com/ndk/guides/index.html) installed
+2. Be sure to have a `local.properties` file in this folder that points to the Android SDK and NDK
+```
+ndk.dir=/Users/{username}/Library/Android/sdk/ndk-bundle
+sdk.dir=/Users/{username}/Library/Android/sdk
+```
+3. Delete the `maven` folder
+4. Run `./gradlew installArchives`
+5. Verify that latest set of generated files is in the maven folder with the correct version number

android/build.gradle

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+// android/build.gradle
+
+// based on:
+//
+// * https://github.com/facebook/react-native/blob/0.60-stable/template/android/build.gradle
+//   original location:
+//   - https://github.com/facebook/react-native/blob/0.58-stable/local-cli/templates/HelloWorld/android/build.gradle
+//
+// * https://github.com/facebook/react-native/blob/0.60-stable/template/android/app/build.gradle
+//   original location:
+//   - https://github.com/facebook/react-native/blob/0.58-stable/local-cli/templates/HelloWorld/android/app/build.gradle
+
+def DEFAULT_COMPILE_SDK_VERSION = 28
+def DEFAULT_BUILD_TOOLS_VERSION = '28.0.3'
+def DEFAULT_MIN_SDK_VERSION = 16
+def DEFAULT_TARGET_SDK_VERSION = 28
+
+def safeExtGet(prop, fallback) {
+    rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
+}
+
+apply plugin: 'com.android.library'
+apply plugin: 'maven'
+
+buildscript {
+    // The Android Gradle plugin is only required when opening the android folder stand-alone.
+    // This avoids unnecessary downloads and potential conflicts when the library is included as a
+    // module dependency in an application project.
+    // ref: https://docs.gradle.org/current/userguide/tutorial_using_tasks.html#sec:build_script_external_dependencies
+    if (project == rootProject) {
+        repositories {
+            google()
+            jcenter()
+        }
+        dependencies {
+            classpath 'com.android.tools.build:gradle:3.4.1'
+        }
+    }
+}
+
+apply plugin: 'com.android.library'
+apply plugin: 'maven'
+
+android {
+    compileSdkVersion safeExtGet('compileSdkVersion', DEFAULT_COMPILE_SDK_VERSION)
+    buildToolsVersion safeExtGet('buildToolsVersion', DEFAULT_BUILD_TOOLS_VERSION)
+    defaultConfig {
+        minSdkVersion safeExtGet('minSdkVersion', DEFAULT_MIN_SDK_VERSION)
+        targetSdkVersion safeExtGet('targetSdkVersion', DEFAULT_TARGET_SDK_VERSION)
+        versionCode 1
+        versionName "1.0"
+    }
+    lintOptions {
+        abortOnError false
+    }
+}
+
+repositories {
+    // ref: https://www.baeldung.com/maven-local-repository
+    mavenLocal()
+    maven {
+        // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
+        url "$rootDir/../node_modules/react-native/android"
+    }
+    maven {
+        // Android JSC is installed from npm
+        url "$rootDir/../node_modules/jsc-android/dist"
+    }
+    google()
+    jcenter()
+}
+
+dependencies {
+    //noinspection GradleDynamicVersion
+    implementation 'com.facebook.react:react-native:+'  // From node_modules
+}
+
+def configureReactNativePom(def pom) {
+    def packageJson = new groovy.json.JsonSlurper().parseText(file('../package.json').text)
+
+    pom.project {
+        name packageJson.title
+        artifactId packageJson.name
+        version = packageJson.version
+        group = "com.uiwjs.react.wechat"
+        description packageJson.description
+        url packageJson.repository.baseUrl
+
+        licenses {
+            license {
+                name packageJson.license
+                url packageJson.repository.baseUrl + '/blob/master/' + packageJson.licenseFilename
+                distribution 'repo'
+            }
+        }
+
+        developers {
+            developer {
+                id packageJson.author.username
+                name packageJson.author.name
+            }
+        }
+    }
+}
+
+afterEvaluate { project ->
+    // some Gradle build hooks ref:
+    // https://www.oreilly.com/library/view/gradle-beyond-the/9781449373801/ch03.html
+    task androidJavadoc(type: Javadoc) {
+        source = android.sourceSets.main.java.srcDirs
+        classpath += files(android.bootClasspath)
+        classpath += files(project.getConfigurations().getByName('compile').asList())
+        include '**/*.java'
+    }
+
+    task androidJavadocJar(type: Jar, dependsOn: androidJavadoc) {
+        classifier = 'javadoc'
+        from androidJavadoc.destinationDir
+    }
+
+    task androidSourcesJar(type: Jar) {
+        classifier = 'sources'
+        from android.sourceSets.main.java.srcDirs
+        include '**/*.java'
+    }
+
+    android.libraryVariants.all { variant ->
+        def name = variant.name.capitalize()
+        def javaCompileTask = variant.javaCompileProvider.get()
+
+        task "jar${name}"(type: Jar, dependsOn: javaCompileTask) {
+            from javaCompileTask.destinationDir
+        }
+    }
+
+    artifacts {
+        archives androidSourcesJar
+        archives androidJavadocJar
+    }
+
+    task installArchives(type: Upload) {
+        configuration = configurations.archives
+        repositories.mavenDeployer {
+            // Deploy to react-native-event-bridge/maven, ready to publish to npm
+            repository url: "file://${projectDir}/../android/maven"
+            configureReactNativePom pom
+        }
+    }
+}

android/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="com.uiwjs.react.wechat">
+
+</manifest>

android/src/main/java/com/uiwjs/react/wechat/RNWechatModule.java

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+package com.uiwjs.react.wechat;
+
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.bridge.ReactContextBaseJavaModule;
+import com.facebook.react.bridge.ReactMethod;
+import com.facebook.react.bridge.Callback;
+
+public class RNWechatModule extends ReactContextBaseJavaModule {
+
+    private final ReactApplicationContext reactContext;
+
+    public RNWechatModule(ReactApplicationContext reactContext) {
+        super(reactContext);
+        this.reactContext = reactContext;
+    }
+
+    @Override
+    public String getName() {
+        return "RNWechat";
+    }
+
+    @ReactMethod
+    public void sampleMethod(String stringArgument, int numberArgument, Callback callback) {
+        // TODO: Implement some actually useful functionality
+        callback.invoke("Received numberArgument: " + numberArgument + " stringArgument: " + stringArgument);
+    }
+}

android/src/main/java/com/uiwjs/react/wechat/RNWechatPackage.java

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+package com.uiwjs.react.wechat;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import com.facebook.react.ReactPackage;
+import com.facebook.react.bridge.NativeModule;
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.uimanager.ViewManager;
+import com.facebook.react.bridge.JavaScriptModule;
+
+public class RNWechatPackage implements ReactPackage {
+    @Override
+    public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
+        return Arrays.<NativeModule>asList(new RNWechatModule(reactContext));
+    }
+
+    @Override
+    public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
+        return Collections.emptyList();
+    }
+}