做网站还是小程序/整合营销名词解释
您的位置确实不会保存在数据库中,因为每次更新您的位置时(通过onLocationChanged(位置位置))
你应该做的是在你的OnCreate()方法中使用你的timerinitialization.然后声明这些变量.
double lat = location.getLatitude();
double lng = location.getLongitude();
double alt = location.getAltitude();
作为全局并在onLocationChanged(位置位置)方法中更新它们.这样,只要计时器调用数据库中的持久性,lat,lng,alt值就会可用并根据您的最新位置进行更新.
//decalred as global variables
String curTime;
double lat;
double lng;
double alt;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LocationManager locationManager;
String context = Context.LOCATION_SERVICE;
locationManager = (LocationManager)getSystemService(context);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
String provider = locationManager.getBestProvider(criteria,true);
//Initialize timer
Timer timer = new Timer();
timer.schedule(new TimerTask(){
@Override
public void run(){
db.execSQL("INSERT INTO location (longitude,latitude,altitude,tgl_buat) VALUES " +
"('"+lng+"','"+lat+"','"+alt+"','"+curTime+"')");
db.close();
}
},10*60*1000,10*60*1000);
updateWithNewLocation(null);
locationManager.requestLocationUpdates(provider,(10*60*1000),10,locationListener);
}
private final LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
updateWithNewLocation(location);
}
public void onProviderDisabled(String provider){
updateWithNewLocation(null);
}
public void onProviderEnabled(String provider){ }
public void onStatusChanged(String provider,int status,Bundle extras){ }
};
public void updateWithNewLocation(Location location) {
if (location != null) {
Dbhelper helper = new Dbhelper(this);
final SQLiteDatabase db = helper.getWritableDatabase();
long time = System.currentTimeMillis();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd kk:mm:ss");
curTime = df.format(time);
lat = location.getLatitude();
lng = location.getLongitude();
alt = location.getAltitude();
System.out.println(lat);
System.out.println(lng);
System.out.println(alt);
}
}
添加： – 如果您绘制路径,则使用此代码
/** Called when the activity is first created. */
private List mapOverlays;
private Projection projection;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
linearLayout = (LinearLayout) findViewById(R.id.zoomview);
mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
mapOverlays = mapView.getOverlays();
projection = mapView.getProjection();
mapOverlays.add(new MyOverlay());
}
@Override
protected boolean isRouteDisplayed() {
return false;
}
class MyOverlay extends Overlay{
public MyOverlay(){
}
public void draw(Canvas canvas,MapView mapv,boolean shadow){
super.draw(canvas,mapv,shadow);
Paint mPaint = new Paint();
mPaint.setDither(true);
mPaint.setColor(Color.RED);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(2);
GeoPoint gP1 = new GeoPoint(19240000,-99120000);
GeoPoint gP2 = new GeoPoint(37423157,-122085008);
Point p1 = new Point();
Point p2 = new Point();
Path path = new Path();
projection.toPixels(gP1,p1);
projection.toPixels(gP2,p2);
path.moveTo(p2.x,p2.y);
path.lineTo(p1.x,p1.y);
canvas.drawPath(path,mPaint);
}