创建Android GPS跟踪应用程序 [英] Create an Android GPS tracking application
问题描述
一旦应用程序具有GPS锁定，应用程序可以通过使用覆盖类绘制路线来跟踪其移动。
我看到类似的应用程序，如Mytracks是开源的，但他们对我来说太复杂了。
理想情况下，我很想创建一个这样的应用程序。
他是我的下面的代码，没有导入。 / p>
我想要做的是创建一个数组的地理点。
每次位置更改时，都会创建一个新的地理点。
然后我尝试使用for循环遍历每个地理点，并在它们之间绘制一条路径。
public class跟踪扩展MapActivity实现LocationListener {
LocationManager locman;
LocationListener loclis;
位置位置;
私人MapView地图;
列表< GeoPoint> geoPointsArray = new ArrayList< GeoPoint>（）;
私有MapController控制器;
String provider = LocationManager.GPS_PROVIDER;
双纬;
双龙;
@Override
public void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.map）;
initMapView（）;
initMyLocation（）;
locman =（LocationManager）getSystemService（Context.LOCATION_SERVICE）;
// locman.requestLocationUpdates（provider，60000，100，loclis）;
// Location = locman.getLastKnownLocation（provider）;
}
/ **查找并初始化地图视图。 * /
private void initMapView（）{
map =（MapView）findViewById（R.id.map）;
controller = map.getController（）;
map.setSatellite（false）;
map.setBuiltInZoomControls（true）;
}
/ **查找地图上的当前位置。 * /
private void initMyLocation（）{
final MyLocationOverlay overlay = new MyLocationOverlay（this，map）;
overlay.enableMyLocation（）;
overlay.enableCompass（）; //在模拟器中不起作用
overlay.runOnFirstFix（new Runnable（）{
public void run（）{
//放大到当前位置
controller.setZoom（24 ）;
controller.animateTo（overlay.getMyLocation（））;
}
}）;
map.getOverlays（）。add（overlay）;
}
@Override
public void onLocationChanged（Location location）{
if（Location！= null）{
lat = Location.getLatitude（） ;
lon = Location.getLongitude（）;
GeoPoint New_geopoint = new GeoPoint（（int）（lat * 1e6），
（int）（lon * 1e6））;
controller.animateTo（New_geopoint）;
}
}
class MyOverlay extends Overlay {
public MyOverlay（）{
}
public void draw（Canvas canvas，MapView mapv，boolean shadow）{
super.draw（canvas，mapv，shadow）;
投影投影= map.getProjection（）;
路径p = new Path（）; $（$ i $）$ {
if（i == geoPointsArray.size（） - 1）{
break;
for（int i = 0; i< geoPointsArray.size（）; i ++）
}
Point from = new Point（）;
指向= new Point（）;
projection.toPixels（geoPointsArray.get（i），from）;
projection.toPixels（geoPointsArray.get（i + 1），to）;
p.moveTo（from.x，from.y）;
p.lineTo（to.x，to.y）;
}
绘制mPaint = new Paint（）;
mPaint.setStyle（Style.STROKE）;
mPaint.setColor（0xFFFF0000）;
mPaint.setAntiAlias（true）;
canvas.drawPath（p，mPaint）;
super.draw（画布，地图，阴影）;
}
}
@Override
public void onProviderDisabled（String provider）{
// TODO自动生成的方法存根
@Override
public void onProviderEnabled（String provider）{
// TODO自动生成的方法存根
}
@Override
public void onStatusChanged（String provider，int status，Bundle extras）{
// TODO自动生成的方法存根
}
@Override
protected boolean isRouteDisplayed（）{
// TODO自动生成的方法stub
return false;
}
}
应用程序运行正常，没有错误，但没有路径绘制，位置点只是移动我移动。
任何帮助将非常感谢
谢谢。
您感兴趣的Android移动应用程序 open-gpstracker 的源代码可用这里。
您可以使用SVN客户端应用程序或通过Git检查代码：
- svn结帐 http://open-gpstracker.googlecode.com/svn/trunk/ open-gpstracker-read-only
- git clone https： //code.google.com/p/open-gpstracker/
调试源代码一定会帮助您。
Recently I've taken up android development as a hobby and was looking to develop an application that can find and track a users position using Google Maps.
Once the application has a GPS lock, The application can track their movements by drawing a route using an overlay class.
I've seen similar applications like Mytracks that are open source but they're too complex for me right now.
Ideally i'd love to create an application that looks like this
He is my code below without the imports.
What I'm trying to do is create an array of geopoints. Every time the location changes a new geopoint is created. I then try to use a for loop to iterate through each geopoint and draw a path between them.
public class Tracking extends MapActivity implements LocationListener {
LocationManager locman;
LocationListener loclis;
Location Location;
private MapView map;
List<GeoPoint> geoPointsArray = new ArrayList<GeoPoint>();
private MapController controller;
String provider = LocationManager.GPS_PROVIDER;
double lat;
double lon;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
initMapView();
initMyLocation();
locman = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// locman.requestLocationUpdates(provider,60000, 100,loclis);
// Location = locman.getLastKnownLocation(provider);
}
/** Find and initialize the map view. */
private void initMapView() {
map = (MapView) findViewById(R.id.map);
controller = map.getController();
map.setSatellite(false);
map.setBuiltInZoomControls(true);
}
/** Find Current Position on Map. */
private void initMyLocation() {
final MyLocationOverlay overlay = new MyLocationOverlay(this, map);
overlay.enableMyLocation();
overlay.enableCompass(); // does not work in emulator
overlay.runOnFirstFix(new Runnable() {
public void run() {
// Zoom in to current location
controller.setZoom(24);
controller.animateTo(overlay.getMyLocation());
}
});
map.getOverlays().add(overlay);
}
@Override
public void onLocationChanged(Location location) {
if (Location != null) {
lat = Location.getLatitude();
lon = Location.getLongitude();
GeoPoint New_geopoint = new GeoPoint((int) (lat * 1e6),
(int) (lon * 1e6));
controller.animateTo(New_geopoint);
}
}
class MyOverlay extends Overlay {
public MyOverlay() {
}
public void draw(Canvas canvas, MapView mapv, boolean shadow) {
super.draw(canvas, mapv, shadow);
Projection projection = map.getProjection();
Path p = new Path();
for (int i = 0; i < geoPointsArray.size(); i++) {
if (i == geoPointsArray.size() - 1) {
break;
}
Point from = new Point();
Point to = new Point();
projection.toPixels(geoPointsArray.get(i), from);
projection.toPixels(geoPointsArray.get(i + 1), to);
p.moveTo(from.x, from.y);
p.lineTo(to.x, to.y);
}
Paint mPaint = new Paint();
mPaint.setStyle(Style.STROKE);
mPaint.setColor(0xFFFF0000);
mPaint.setAntiAlias(true);
canvas.drawPath(p, mPaint);
super.draw(canvas, map, shadow);
}
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
}
The application runs fine without errors but there is no path drawn, the location dot just moves as i move.
Any help would be greatly appreciated Thanks.
The source code for the Android mobile application open-gpstracker which you appreciated is available here.
You can checkout the code using SVN client application or via Git:
- svn checkout http://open-gpstracker.googlecode.com/svn/trunk/ open-gpstracker-read-only
- git clone https://code.google.com/p/open-gpstracker/
Debugging the source code will surely help you.
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