react-native调用java方法
reactnativeui框架要在React Native中调用Java方法,可以使用React Native的原生模块和桥接机制。首先,在Java中创建一个类,并使用ReactMethod注解标记要暴露给React Native的方法。例如:application;import act.bridge.ReactApplicationContext;import act.bridge.ReactContextBaseJavaModule;import act.bridge.ReactMethod;public class MyJavaModule extends ReactContextBaseJavaModule { public MyJavaModule(ReactApplicationContext reactContext) { super(reactContext); } @Override public String getName() { return "MyJavaModule"; } @ReactMethod public void myMethod(String message) { 在这里执行你的具体逻辑 System.out.println("Received message from React Native: " + message); }}然后,在React Native中导入NativeModules,并使用NativeModules调用Java方法。例如:javascriptimport React from 'react';import { NativeModules, Button } from 'react-native';const MyJavaModule = NativeModules.MyJavaModule;const App = () => { const callJavaMethod = () => { Method('Hello from React Native'); }; r
eturn ( <Button title="Call Java Method" onPress={callJavaMethod} /> );};export default App;最后,要在React Native应用程序的JavaScript和原生代码之间建立关联,需要在Java底层实现一个ReactPackage,然后将其添加到ReactInstanceManager中。例如:application;import act.ReactPackage;import act.bridge.NativeModule;import act.bridge.ReactApplicationContext;import act.uimanager.ViewManager;import java.util.ArrayList;import java.util.Collections;import java.util.List;public class MyPackage implements ReactPackage { @Override public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) { List<NativeModule> modules = new ArrayList<>(); modules.add(new MyJavaModule(reactContext)); return modules; } @Override public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) { ptyList(); }}在主应用程序的MainApplication类中,将MyPackage添加到R
eactInstanceManager中。例如:application;import android.app.Application;t.Context;import act.PackageList;import act.ReactApplication;import act.ReactInstanceManager;import act.ReactNativeHost;import com.facebook.soloader.SoLoader;import flect.InvocationTargetException;import java.util.List;public class MainApplication extends Application implements ReactApplication { private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) { @Override public boolean getUseDeveloperSupport() { return BuildConfig.DEBUG; } @Override protected List<ReactPackage> getPackages() { @SuppressWarnings("UnnecessaryLocalVariable") List<ReactPackage> packages = new PackageList(this).getPackages(); packages.add(new MyPackage()); 添加MyPackage return packages; } @Override protected String getJSMainModuleName() { return "inde
x"; } }; @Override public ReactNativeHost getReactNativeHost() { return mReactNativeHost; } @Override public void onCreate() { Create(); SoLoader.init(this, /* native exopackage */ false); }}这样,就可以在React Native中调用Java方法了。在React Native中调用`Method('Hello from React Native');`时,Java中的`myMethod`方法将被执行,并在控制台中打印出`Received message from React Native: Hello from React Native`。
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