java - 如何在android中每1分钟移动一次获得不同的纬度和经度？

Question

现在我正在使用 GPS 在移动时每 1 分钟获取不同的纬度和经度，并且必须将其存储到数组列表中。我为此使用线程。我点击了这个链接。 http://www.androidhive.info/2012/08/android-working-with-google-places-and-maps-tutorial/

我的代码是

跟踪.java

package com.example.getlatlang;

import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;


public class Tracking extends Activity 
{

Button btnShowLocation;
boolean isRepeat = true;
 protected int splashTime = 1000;

 int timer =0;
Thread th;
ArrayList<Double> lat_array = new ArrayList<Double>();
ArrayList<Double> lon_array = new ArrayList<Double>();
// GPSTracker class
GPSTracker gps;

@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.currentlocation);

    btnShowLocation = (Button) findViewById(R.id.start_bt);

    // show location button click event
    btnShowLocation.setOnClickListener(new View.OnClickListener()
    {

        @Override
        public void onClick(View arg0)
        {       
            // create class object

            if(isRepeat)
            {
                isRepeat = false;
                btnShowLocation.setBackgroundResource(R.drawable.stop);
                if(lat_array.size()>0 && lon_array.size()>0)
                {
                    lat_array.clear();
                    lon_array.clear();
                    System.out.println("Array cleared...");
                }
            // check if GPS enabled th=new Thread()
                th=new Thread()
                 {
                     @Override
                        public void run(){
                            try
                            {
                               for (timer = 0; timer < 20; timer++)
                               {
                                   // int waited = 0;
                                  //  while(waited < splashTime)
                                  //  {
                                        Thread.sleep(100);
                                        runOnUiThread(new Runnable()
                                        {
                                            @Override
                                            public void run()
                                            {
                                                try
                                                {    gps = new GPSTracker(Tracking.this);
                                                    if(gps.canGetLocation())
                                                    {

                                                        double latitude = gps.getLatitude();
                                                        double longitude = gps.getLongitude();

                                                        lat_array.add(latitude);

                                                        lon_array.add(longitude);
                                                        // \n is for new line
                                                        System.out.println("lat_array"+lat_array+"lon_array"+lon_array);
                                                        Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + lat_array + "\nLong: " + lon_array, Toast.LENGTH_LONG).show();   
                                                    }
                                                    else
                                                    {
                                                        // can't get location
                                                        // GPS or Network is not enabled
                                                        // Ask user to enable GPS/network in settings
                                                        gps.showSettingsAlert();
                                                    }
                                                }
                                                catch(Exception e)
                                                {
                                                    e.printStackTrace();
                                                }
                                            }
                                        });
                                    //  waited += 100;
                                    //}
                               }}
                           catch (InterruptedException e)
                           {
                            }

                        }
                    };
                    th.start();

                }


            else
            {

                isRepeat = true;                      
                th.interrupt();
                btnShowLocation.setBackgroundResource(R.drawable.start);

            }
        }
    });
}
public void ohDestroy()
{
     th.stop();
}
}

GPSTracker.java

package com.example.getlatlang;

import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;

 public class GPSTracker extends Service implements LocationListener
 {

private final Context mContext;

// flag for GPS status
boolean isGPSEnabled = false;

// flag for network status
boolean isNetworkEnabled = false;

// flag for GPS status
boolean canGetLocation = false;

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 * 60 * 1; // 1 minute

// Declaring a Location Manager
protected LocationManager locationManager;

public GPSTracker(Context context) {
    this.mContext = context;
    getLocation();
}

public Location 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
        } else {
            this.canGetLocation = true;
            if (isNetworkEnabled) {
                locationManager.requestLocationUpdates(
                        LocationManager.NETWORK_PROVIDER,
                        MIN_TIME_BW_UPDATES,
                        MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                Log.d("Network", "Network");
                if (locationManager != null) {
                    location = locationManager
                            .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                    if (location != null) {
                        latitude = location.getLatitude();
                        longitude = location.getLongitude();
                    }
                }
            }
            // if GPS Enabled get lat/long using GPS Services
            if (isGPSEnabled) {
                if (location == null) {
                    locationManager.requestLocationUpdates(
                            LocationManager.GPS_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("GPS Enabled", "GPS Enabled");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
            }
        }

    } catch (Exception e) {
        e.printStackTrace();
    }

    return location;
}

/**
 * Stop using GPS listener
 * Calling this function will stop using GPS in your app
 * */
public void stopUsingGPS(){
    if(locationManager != null){
        locationManager.removeUpdates(GPSTracker.this);
    }       
}

/**
 * Function to get latitude
 * */
public double getLatitude(){
    if(location != null){
        latitude = location.getLatitude();
    }

    // return latitude
    return latitude;
}

/**
 * Function to get longitude
 * */
public double getLongitude(){
    if(location != null){
        longitude = location.getLongitude();
    }

    // return longitude
    return longitude;
}

/**
 * Function to check GPS/wifi enabled
 * @return boolean
 * */
public boolean canGetLocation() {
    return this.canGetLocation;
}

/**
 * Function to show settings alert dialog
 * On pressing Settings button will lauch Settings Options
 * */
public void showSettingsAlert(){
    AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

    // Setting Dialog Title
    alertDialog.setTitle("GPS is settings");

    // Setting Dialog Message
    alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

    // On pressing Settings button
    alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog,int which) {
            Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            mContext.startActivity(intent);
        }
    });

    // on pressing cancel button
    alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
        dialog.cancel();
        }
    });

    // Showing Alert Message
    alertDialog.show();
}

@Override
public void onLocationChanged(Location location) {
}

@Override
public void onProviderDisabled(String provider) {
}

@Override
public void onProviderEnabled(String provider) {
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}

@Override
public IBinder onBind(Intent arg0) {
    return null;
}

 }

现在我的问题是在移动时无法获得不同的纬度和经度点。第一个值仅在数组中存储了 20 次。因为我设置了 Tread 必须运行 20 次。但我想获得不同的点并将其存储到数组列表中。我不知道我哪里做错了。任何人都可以帮助我解决这个问题吗？提前致谢。

Answer 1

您在收集纬度的循环中使用了 sleep(100)。
这里的时间单位是微秒。(据我所知)
20*100 = 2000，即 2 秒。而且我不认为 GPS 更新那么快。
看看这个。

相反，您可以使用相同的循环，但仅当该值与之前的值不同时才存储该值。

if(oldLat != curLat){
  //store curLat to array
  //and make oldLat = curLat
}