抱歉,我知道这里发生过此类问题,但是我无法在代码中对其进行操作,我是初学者...
因此,我试图从LocationManager读取GPS坐标,并且我的代码抛出“无法在尚未调用Looper.prepare()的线程内创建处理程序”的信息。
因此,我的代码以这种方式工作。我使用Timer和Timertask类来创建计划任务,从中读取我的坐标。
这是一个计时器类:
public class GeoLocationTimer extends Timer {
private List coords;
private Context context;
public GeoLocationTimer(Context context){
this.context = context;
this.coords = new ArrayList<Double>();
//Log.e("cont timer","content" + context);
}
public void addPosition(Double pos) {
this.coords.add(pos);
}
public void scheduleTasks(long interval) {
//Log.e("z schedule","cont"+context);
this.schedule(new GeoLocationTask(this, context), 0, interval);
}
public void cancelTasks() {
this.cancel();
}
public List getList(){
return coords;
}
这是任务:
public class GeoLocationTask extends TimerTask{
private final GeoLocationTimer timerContext;
private final Context context;
private Pair<Double, Double> coordsSet;
public GeoLocationTask(GeoLocationTimer timerContext, Context context){
this.timerContext = timerContext;
this.context = context;
}
@Override
public void run() {
// TODO Auto-generated method stub
GeoActivity tracker = new GeoActivity(context);
coordsSet = tracker.getLocation();
Log.e("first","timertask");
if (coordsSet != null){
Log.e("first","a tu wartosc" + coordsSet.first);
Log.e("second","a tu wartosc" + coordsSet.second);
timerContext.addPosition(coordsSet.first);
timerContext.addPosition(coordsSet.second);
//context.addPosition(tracker.getLocationNow().get(1));
}
}
public boolean cancel() {
return false;
}
}
这是我要从中运行此任务的上下文:
package com.example.gpstracking;
public class GeoActivity extends ContextWrapper {
Context context;
public GeoActivity(Context base) {
super(base);
this.context = base;
}
public Pair<Double, Double> getLocation(){
Tracking track = new Tracking(context);
return track.getLocation();
}
并立即跟踪:
public class Tracking extends Service implements LocationListener{
private final Context mContext;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 30 * 1; // 0.5 minute
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
boolean canGetLocation = false;
protected LocationManager locationManager;
public Tracking(Context context) {
this.mContext = context;
}
public Pair<Double, Double> getLocation() {
try {
locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
Log.e("no provider","turn it on man!");
} else {
this.canGetLocation = true;
// First get location from Network Provider
if (isNetworkEnabled) {
Log.e("Network", "Network");
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
latitude = location.getLatitude();
longitude = location.getLongitude();
Log.e("latitude","latitude"+latitude);
Log.e("longitude","longitude"+longitude);
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
return new Pair(latitude,longitude);
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
Log.e("GPS", "GPS");
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
longitude = location.getLongitude();
return new Pair(latitude,longitude);
}
}
} catch (Exception e) {
Log.e("excepton:","exp" + e.getMessage());
e.printStackTrace();
e.getMessage();
}
return new Pair(0.0,0.0);
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
}
因此,对不起您感到愚蠢。有人可以帮我吗?
干杯
一种
最佳答案
我可能发现了问题:我真的不应该在这里调用requestlocationupdates,因为我在定时器类中要求更新。需要去外面测试:)
干杯!
关于java - requestLocationUpdates引发错误,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/32679591/