我想用GPS信号跟踪设备。同时显示纬度,经度,高度和速度。
我使用此代码,屏幕上没有结果:
@Override
protected void onGpsTracker_ButtonAction(Component c, ActionEvent event) {
try {
int i = 0;
Location loc = mylocLocationManager.getCurrentLocation();
if(loc.getStatus()==LocationManager.AVAILABLE) {
} else {
Dialog.show("Error!", "Falla de señal", "OK", null);
}
mylocLocationManager.setLocationListener(new LocationListener() {
public void locationUpdated(Location location) {
gpsLocation= location;
Component c = null;
Label labelalt = (Label)findByName("altitudT", c);
Label labellat = (Label)findByName("latitudT", c);
Label labellng = (Label)findByName("longitudT", c);
Label labeldist = (Label)findByName("distanciaT", c);
Label labelspeed = (Label)findByName("speedT", c);
altmax= location.getAltitude();
double lat = location.getLatitude();
double lng = location.getLongitude();
float speed = location.getVelocity();
double alt = location.getAltitude();
velprompos = velprompos + 1;
totspeed = (int) (totspeed + speed);
velopro = totspeed / velprompos;
totalt = altmax - alt;
velmax=speed;
Coord lastLocation = new Coord(lat, lng);
mapComponent.zoomTo(lastLocation, 15);
prevdistance = totdistance;
prevLon = currentLon;
prevLat = currentLat;
String Salt = String.valueOf(alt);
labelalt.setText(Salt);
String Slat = String.valueOf(lat);
labellat.setText(Slat);
String Slng = String.valueOf(lng);
labellng.setText(Slng);
String Sspeed = String.valueOf(speed);
labelspeed.setText(Sspeed);
//aca hay q pner dibujo lineas
}
public void providerStateChanged(int newState) {
//positionMethod();
}
});
} catch (Exception ex) {
ex.printStackTrace();
gpsLocation = null;
}
}
这个想法是获取设备移动时的位置,并在某些标签上显示此结果。有什么帮助吗?
你错误地实现了几件事。
-
将
@override
添加到覆盖的方法(如locationUpdated
和providerStateChanged
(。 -
不要将
Component c
重新声明为 并将其设置为 null -
通过使用
find
方法直接调用标签并将c
作为参数传递来获取标签 -
每次更新后
revalidate
或repaint
表单。 -
作为一般建议,请保持变量声明的一致性,将芒果数量声明为
numOfMangoes
,而不是numberofmangoes
,也不numofmangoes
Numberofmangoes
。@Override protected void onGpsTracker_ButtonAction(Component c, ActionEvent event) { try { int i = 0; Location loc = mylocLocationManager.getCurrentLocation(); if (loc.getStatus() == LocationManager.AVAILABLE) { System.out.println("Location available"); } else { Dialog.show("Error!", "Falla de señal", "OK", null); } final LocationManager mylocLocationManager = LocationManager.getLocationManager(); mylocLocationManager.setLocationListener(new LocationListener() { @Override public void locationUpdated(Location location) { gpsLocation = location; Label labelspeed = ; altmax = location.getAltitude(); double lat = location.getLatitude(); double lng = location.getLongitude(); float speed = location.getVelocity(); double alt = location.getAltitude(); velprompos = velprompos + 1; totspeed = (int) (totspeed + speed); velopro = totspeed / velprompos; totalt = altmax - alt; velmax = speed; Coord lastLocation = new Coord(lat, lng); mapComponent.zoomTo(lastLocation, 15); prevdistance = totdistance; prevLon = currentLon; prevLat = currentLat; String Salt = String.valueOf(alt); findAltitudT(c).setText(Salt); String Slat = String.valueOf(lat); findLatitudT(c).setText(Slat); String Slng = String.valueOf(lng); findLongitudT(c).setText(Slng); String Sspeed = String.valueOf(speed); findSpeedT(c).setText(Sspeed); c.getComponentForm().revalidate(); //aca hay q pner dibujo lineas } @Override public void providerStateChanged(int newState) { //positionMethod(); } }); } catch (Exception ex) { ex.printStackTrace(); gpsLocation = null; } }