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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