使用本机获取卫星数量 [英] Getting the number of satellites using react-native
问题描述
我正在使用 react-native 创建我的android应用程序.我已经安装了 react-native-fused-location 以获得更好的位置. 我想找到我的GNSS传感器可以找到的卫星数量,并知道已经修复了多少颗卫星. 我知道我的GNSS传感器可以流式传输 NMEA格式,但是我不知道该怎么办我得到带有react-native的NMEA文件.我的GNSS传感器已通过蓝牙连接到我的android手机. GNSS传感器是 Hi-Target Qbox系列GIS数据收集器. 谢谢你.
I'm using react-native to create my android application. I've installed react-native-fused-location to get better location. I want to find the number of satellites that my GNSS sensor can find and know how many of them has been fixed. I know that my GNSS sensor can stream NMEA format but I don't know how should i get the NMEA file with react-native. my GNSS sensor has been connected to my android phone by Bluetooth. GNSS sensor is Hi-Target Qbox series GIS data collector. Thank you.
更新:
我发现可以通过NMEA格式获取卫星数.
这是GGA的回复:
Update:
I found that It will be possible to get number of satellite by NMEA format.
This is a GGA response:
$ GPGGA,123519,4807.038,N,01131.000,E,1, 08 ,0.9,545.4,M,46.9,M ,, * 47
$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47
我发现正在追踪08颗卫星.
所以,我只需要获取NMEA字符串即可.
I can find that 08 satellites being tracked.
so, I just need to get NMEA string.
推荐答案
此问题通过创建本机模块解决.
This problem solved by creating a native module.
我在下面的目录中创建了两个文件,以支持我的项目的卫星数".
I created two files in bellow directory to support "number of satellite" for my project.
C:\Users\user\Desktop\project_name\android\app\src\main\java\com\project_name
AnExampleReactPackage.java
package com.facebook.react.modules.toast;
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 AnExampleReactPackage 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 ToastModule1(reactContext));
return modules;
}
}
ToastModule1.java
package com.facebook.react.modules.toast;
import android.widget.Toast;
import android.location.Location;
import android.location.LocationManager;
import android.location.LocationListener;
import android.content.Context;
import com.facebook.react.bridge.ReadableMap;
import android.os.Bundle;
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;
public class ToastModule1 extends ReactContextBaseJavaModule {
ReactApplicationContext mReactContext;
private LocationManager locationManager;
public ToastModule1(ReactApplicationContext reactContext) {
super(reactContext);
ReactApplicationContext mReactContext = reactContext;
locationManager = (LocationManager) mReactContext.getSystemService(Context.LOCATION_SERVICE);
}
@Override
public String getName() {
return "ToastExample";
}
@ReactMethod
public void show(String message, int duration) {
Toast.makeText(getReactApplicationContext(), message, Toast.LENGTH_SHORT).show();
}
@ReactMethod
public void getCoors(){
// Define a listener that responds to location updates
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
// Called when a new location is found by the network location provider.
show("Latitude:" + location.getLatitude() + ", Longitude:" + location.getLongitude()+", Satellites:" +location.getExtras().getInt("satellites"),1);
}
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
}
}
之后,我在MainApplication.java文件中添加了这一行:
After that i added this line in my MainApplication.java file:
...
@Override
protected List<ReactPackage> getPackages() {
return Arrays.<ReactPackage>asList(
new MainReactPackage(),
new AnExampleReactPackage() // <-- Add this line with your package name.
);
}
...
最后,我将以下代码添加到App.js文件中,以使用我的本地模块: App.js或android.index.js
Finally, I added this code in my App.js file to use my native module: App.js or android.index.js
/**
* Sample React Native App
* https://github.com/facebook/react-native
* @flow
*/
import React, { Component } from 'react';
import {
Platform,
StyleSheet,
Text,
View
} from 'react-native';
import {NativeModules} from 'react-native';
function findNumberOfSatellites(context){
NativeModules.ToastExample.show("It's Starting to find satellites!", 1);
var count = "searching...";
NativeModules.ToastExample.getCoors();
context.setState({satellites : count});
}
export default class App extends Component<Props> {
constructor(props) {
super(props);
this.state = {satellites: null}
}
componentDidMount(){
setTimeout(findNumberOfSatellites,500,this);
}
render() {
return (
<View style={styles.container}>
<Text style={styles.welcome}>
Satellite Counter!
</Text>
<Text style={styles.instructions}>
{this.state.satellites}
</Text>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
}
});
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