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我按照文档并尝试从 react native 调用 ToastExample.show() 。但它总是显示 错误

我的代码：

公共类 CustomToastPackage 实现 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 ToastModule(reactContext));

    return modules;
}

}

public class ToastModule extends ReactContextBaseJavaModule {

private static final String DURATION_SHORT_KEY = "SHORT";
private static final String DURATION_LONG_KEY = "LONG";

public ToastModule(ReactApplicationContext reactContext) {
    super(reactContext);
}
@Override
public String getName() {
    return "ToastExample";
}
@Override
public Map<String, Object> getConstants() {
    final Map<String, Object> constants = new HashMap<>();
    constants.put(DURATION_SHORT_KEY, Toast.LENGTH_SHORT);
    constants.put(DURATION_LONG_KEY, Toast.LENGTH_LONG);
    return constants;
}
@ReactMethod
public void show(String message, int duration) {
    Toast.makeText(getReactApplicationContext(), message, duration).show();
}

}

主应用程序.Java：

@Override
    protected List<ReactPackage> getPackages() {
        return Arrays.<ReactPackage>asList(
                new MainReactPackage(),
                new ReanimatedPackage(),
                new VectorIconsPackage(),
                new RNGestureHandlerPackage(),
                new CustomToastPackage(),
                new RNSharedPreferencesReactPackage()

        );
    }

ToastExample.js：

import {NativeModules} from 'react-native';
module.exports = NativeModules.ToastExample;

在我的屏幕上：

import ToastExample from './ToastExample'
ToastExample.show('Awesome', ToastExample.SHORT);

我已经尝试过 run-android 和 ./gradlew clean 很多次了。代码有什么问题？

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0 回答 0