[英]How to call a Java method from Javascript
如何從 Javascript 調用 Java 方法/ function?
Java Function:
class Javafunction{
public static void main(String[] args){
System.out.println("It Works!");
}
}
Javascript Function:
function CallJavafunction() {
Javafunction()
}
感謝您的回答
要在 react-native 應用程序中從 javascript 調用 java 代碼,您必須創建一個模塊
我建議閱讀文檔: https://reactnative.dev/docs/native-modules-android
Java 代碼 - android/app/src/main/java/com/your-app-name/JavaModule.java
package com.your-app-name; // replace com.your-app-name with your app’s name
import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import java.util.Map;
import java.util.HashMap;
public class JavaModule extends ReactContextBaseJavaModule {
JavaModule(ReactApplicationContext context) {
super(context);
}
@Override
public String getName() {
return "JavaModule";
}
@ReactMethod
public void Javafunction(){
System.out.println("It Works!");
}
}
注冊模塊 - android/app/src/main/java/com/your-app-name/MyAppPackage.java
package com.your-app-name; // replace your-app-name with your app’s name
import com.facebook.react.ReactPackage;
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;
public class MyAppPackage implements ReactPackage {
@Override
public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
return Collections.emptyList();
}
@Override
public List<NativeModule> createNativeModules(
ReactApplicationContext reactContext) {
List<NativeModule> modules = new ArrayList<>();
modules.add(new JavaModule(reactContext));
return modules;
}
}
JavaScript代碼
const { JavaModule } = ReactNative.NativeModules;
JavaModule.Javafunction();
你不能這樣做但是你可以從 JavaScript 適配器調用 Java 代碼
這是示例和文檔: https://www.ibm.com/docs/en/mpf/8.0.0?topic=code-calling-java-from-javascript-adapter
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