Init project.

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();
+    }
+}