Javascript React本机Android模块不';行不通
我正在尝试在React Native中运行后台服务。据我所知,我需要用本机Java编写它,并将其连接到react本机代码。我制作了一个模块,它没有抛出错误,但它什么也不做。我曾尝试更改代码以显示一个简单的祝酒词,但它甚至没有这样做。代码如下: 服务:Javascript React本机Android模块不';行不通,javascript,android,react-native,Javascript,Android,React Native,我正在尝试在React Native中运行后台服务。据我所知,我需要用本机Java编写它,并将其连接到react本机代码。我制作了一个模块,它没有抛出错误,但它什么也不做。我曾尝试更改代码以显示一个简单的祝酒词,但它甚至没有这样做。代码如下: 服务: public class TestService extends Service { double distance = 0.0; @Override public int onStartCommand(Intent intent, int f
public class TestService extends Service {
double distance = 0.0;
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Toast.makeText(getApplicationContext(), "Service started...", Toast.LENGTH_SHORT).show();
final ReactContext reactContext = new ReactContext(getApplicationContext());
new Timer().scheduleAtFixedRate(new TimerTask(){
@Override
public void run(){
WritableMap params = Arguments.createMap();
distance+= 0.7;
params.putDouble("distance", distance);
sendEvent(reactContext, "updateDistance", params);
}
},0,1000);
return START_STICKY;
}
private void sendEvent(ReactContext reactContext, String eventName, @Nullable WritableMap params) {
reactContext.getJSModule(DeviceEventManagerModule
.RCTDeviceEventEmitter.class)
.emit(eventName, params);
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
}
模块:
public class ServiceModule extends ReactContextBaseJavaModule {
ReactContext reactContext;
public ServiceModule(ReactApplicationContext reactContext) {
super(reactContext);
this.reactContext = reactContext;
}
@ReactMethod
public void startTrackingService() {
Intent intent = new Intent(reactContext, TestService.class);
reactContext.startService(intent);
Toast.makeText(getReactApplicationContext(), "Starting service...", Toast.LENGTH_SHORT).show();
}
@Override
public String getName() {
return "ServiceModule";
}
}
包装:
public class ServicePackage implements ReactPackage {
@Override
public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
List<NativeModule> modules = new ArrayList<>();
modules.add(new ServiceModule(reactContext));
return modules;
}
@Override
public List<Class<? extends JavaScriptModule>> createJSModules() {
return Collections.emptyList();
}
@Override
public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
return Collections.emptyList();
}
}
在Tracking.js中:
import ServiceModule from '../component/ServiceModule';
....
startTracking() {
console.warn("Trying to start serivce");
ServiceModule.startTrackingService;
}
componentWillMount() {
DeviceEventEmitter.addListener('updateDistance', function(e: Event) {
console.warn("got event");
this.updateDistance(e.distance);
});
}
updateDistance(newDistance) {
this.setState({distance: newDistance});
}
console.warn(“尝试启动服务”)代码>正在显示,因此肯定会调用startTracking()方法
startTracking() {
console.warn("Trying to start serivce");
ServiceModule.startTrackingService();
}
import ServiceModule from '../component/ServiceModule';
....
startTracking() {
console.warn("Trying to start serivce");
ServiceModule.startTrackingService;
}
componentWillMount() {
DeviceEventEmitter.addListener('updateDistance', function(e: Event) {
console.warn("got event");
this.updateDistance(e.distance);
});
}
updateDistance(newDistance) {
this.setState({distance: newDistance});
}
startTracking() {
console.warn("Trying to start serivce");
ServiceModule.startTrackingService();
}