【笔记】React-Native跟Android交互--简单示例

/**
* 使用命令 npx react-native@latest init DemoRN创建项目
* 
* "react": "18.2.0",
* "react-native": "0.73.2"
* 
* 官网有详细教程：https://reactnative.dev/docs/native-modules-android
*/

一、RN invoke android

1、使用Android studio 打开DemoRN项目的android项目创建文件（SendDataToAndroidModule.kt），JavaScript如果要调用原生方法需要用@ReactMethod注解

package com.demornimport android.util.Logimport com.facebook.react.bridge.ReactApplicationContext
import com.facebook.react.bridge.ReactContextBaseJavaModule
import com.facebook.react.bridge.ReactMethodclass SendDataToAndroidModule(reactContext: ReactApplicationContext) : ReactContextBaseJavaModule(reactContext) {override fun getName(): String = "SendDataToAndroidModule"@ReactMethod fun sayHelloEvent(name: String, msg: String) {Log.d("Mortal", "Hi! I'm $name, $msg")}
}

2、需要将native modules注册到react native中

package com.demornimport android.view.View
import com.facebook.react.ReactPackage
import com.facebook.react.bridge.NativeModule
import com.facebook.react.bridge.ReactApplicationContext
import com.facebook.react.uimanager.ReactShadowNode
import com.facebook.react.uimanager.ViewManagerclass MyAppPackage : ReactPackage {override fun createViewManagers(reactContext: ReactApplicationContext): MutableList<ViewManager<View, ReactShadowNode<*>>> = mutableListOf()override fun createNativeModules(reactContext: ReactApplicationContext): MutableList<NativeModule> = listOf(SendDataToAndroidModule(reactContext)).toMutableList()
}

3、完成原生模块的注册后，就可以在RN的JS上验证，新建组件TestAndroidModuleButton.tsx

import React from 'react';
import { NativeModules, Button } from 'react-native';const { SendDataToAndroidModule } = NativeModules;const TestAndroidModuleButton = () => {const onPress = () => {// console.log('We will invoke the native module here!');SendDataToAndroidModule.sayHelloEvent('Monica', 'How do I use AI');};return (<Buttontitle="Say Now"color="#841584"onPress={onPress}/>);
};export default TestAndroidModuleButton;

4、然后import组件

5、改到android原生代码，需要重新运行项目npm run android

6、最后就是回到Android studio 打开Logcat面板，选择模拟器/真机，测试有没有调用原生方法

二、回调(Callback)

1、不管是处理线上应用奔溃/用户问题反馈，还是给不同用户群体推送广告，RN作为移动端也是避免不了要上报用户的设备信息。昨天试了直接npm install react-native-device-info(或expo-device)，暂时用不了，所以放弃了，直接自己实现。

新建模块DeviceModule.kt，reject需要去优化，不然后面报错拿到错误信息还要再处理

package com.demorn.nativeinvokeimport android.provider.Settings
import android.util.Log
import com.demorn.view.MainApplication
import com.facebook.react.bridge.Callback
import com.facebook.react.bridge.Promise
import com.facebook.react.bridge.ReactApplicationContext
import com.facebook.react.bridge.ReactContextBaseJavaModule
import com.facebook.react.bridge.ReactMethod/*** 选择Callback还是Promise根据实际场景而定* */
class DeviceModule(reactContext: ReactApplicationContext) : ReactContextBaseJavaModule(reactContext) {override fun getName(): String = "DeviceModule"/*** 方式一 Callback* @ReactMethod* fun getAndroidId(callback: Callback) {*     callBack.invoke(Settings.Secure.getString(MainApplication.MAIN_APPLICATION!!.contentResolver, Settings.Secure.ANDROID_ID))* }* 调用处：* DeviceModule.getBrand((brand: any) => {*   console.log('Mortal', brand);* })* *//*** 方式二 Promise* 设备ID* */@ReactMethodfun getAndroidId(promise: Promise) {// Settings.Secure.getString(this.getContentResolver(),Settings.Secure.ANDROID_ID);try {promise.resolve(Settings.Secure.getString(MainApplication.MAIN_APPLICATION!!.contentResolver, Settings.Secure.ANDROID_ID))} catch (e: Throwable) {promise.reject("Create Event Error", e)}}/*** 系统版本号* */@ReactMethodfun getSystemVersion(promise: Promise) {try {promise.resolve(android.os.Build.VERSION.RELEASE)} catch (e: Throwable) {promise.reject("Create Event Error", e)}}/*** 手机厂商* */@ReactMethodfun getBrand(promise: Promise) {try {promise.resolve(android.os.Build.BRAND)} catch (e: Throwable) {promise.reject("Create Event Error", e)}}/*** 手机型号* */@ReactMethodfun getSystemModel(promise: Promise) {try {promise.resolve(android.os.Build.MODEL)} catch (e: Throwable) {promise.reject("Create Event Error", e)}}/*** API版本* */@ReactMethodfun getApiLevel(promise: Promise) {try {promise.resolve(android.os.Build.VERSION.SDK_INT.toString())} catch (e: Throwable) {promise.reject("Create Event Error", e)}}
}