ReactNative-JS 调用原生方法实例代码

第一步首先创建ReactNative 模块类继承ReactContextBaseJavaModule

package com.mixture; import android.content.Context; import android.widget.Toast; import com.facebook.react.bridge.ReactApplicationContext; import com.facebook.react.bridge.ReactContextBaseJavaModule; import com.facebook.react.bridge.ReactMethod; /** * Created by Administrator on 2016/9/22. */ public class MyNativeModule extends ReactContextBaseJavaModule { public static final String REACTCLASSNAME = "MyNativeModule"; private Context mContext; public MyNativeModule(ReactApplicationContext reactContext) { super(reactContext); mContext = reactContext; } @Override public String getName() { return REACTCLASSNAME; } /** * 必须添加反射注解不然会报错 * 这个方法就是ReactNative将要调用的方法，会通过此类名字调用 * @param msg */ @ReactMethod public void callNativeMethod(String msg) { Toast.makeText(mContext, msg, Toast.LENGTH_SHORT).show(); } }

第二步创建一个React包管理器实现ReactPackage将每个模块放到模块集合中

package com.mixture; import com.facebook.react.ReactPackage; import com.facebook.react.bridge.JavaScriptModule; import com.facebook.react.bridge.NativeModule; import com.facebook.react.bridge.ReactApplicationContext; import com.facebook.react.uimanager.ViewManager; import java.util.ArrayList; import java.util.Collections; import java.util.List; /** * Created by Administrator on 2016/9/22. */ public class MyReactPackage implements ReactPackage { @Override public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) { List<NativeModule> modules = new ArrayList<>(); modules.add(new MyNativeModule(reactContext)); return modules; } @Override public List<Class<? extends JavaScriptModule>> createJSModules() { return Collections.emptyList(); } @Override public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) { return Collections.emptyList(); } }

第三步在应用入口注册这个React包管理器

package com.mixture; import android.app.Application; import android.util.Log; import com.facebook.react.ReactApplication; import com.facebook.react.ReactInstanceManager; import com.facebook.react.ReactNativeHost; import com.facebook.react.ReactPackage; import com.facebook.react.shell.MainReactPackage; import java.util.Arrays; import java.util.List; public class MainApplication extends Application implements ReactApplication { private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) { @Override protected boolean getUseDeveloperSupport() { return BuildConfig.DEBUG; } @Override protected List<ReactPackage> getPackages() { return Arrays.<ReactPackage>asList( new MainReactPackage(), //在应用中注册这个包管理器 new MyReactPackage() ); } }; @Override public ReactNativeHost getReactNativeHost() { return mReactNativeHost; } }

第四步就是在ReactNative中调用react-native中提供一个NativeModules通过模块名字和方法名字进行调用

/** * Sample React Native App * https://github.com/facebook/react-native * @flow */ import React, {Component} from 'react'; import { AppRegistry, StyleSheet, Text, View, NativeModules, } from 'react-native'; class Mixture extends Component { render() { return ( <View style={styles.container}> <Text style={styles.instructions} onPress={() => this.onClick()}> 调用用原生方法 </Text> </View> ); } /** * 调用原生方法 */ onClick() { NativeModules.MyNativeModule.callNativeMethod('成功调用原生方法'); } } const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', alignItems: 'center', backgroundColor: '#F5FCFF', }, instructions: { textAlign: 'center', color: '#333333', marginBottom: 5, }, }); AppRegistry.registerComponent('Mixture', () => Mixture);

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