现在我正在使用GPS在移动时每1分钟获得不同的经度和经度，并且必须存储到数组列表中。我正在使用线程。我按照这个链接。 http://www.androidhive.info/2012/08/android-working-with-google-places-and-maps-tutorial/
我的代码是
Tracking.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;
}
}
现在我的问题是移动时无法获得不同的纬度和经度点。第一个值仅存储在数组中20次。因为我设置Tread必须像这样运行20次。但我希望获得不同的点并存储到数组列表中。我不知道我在哪里犯了这个错误。任何人都可以帮我解决这个问题吗？提前谢谢。
答案 0 :(得分：1)
申请。它会每10秒刷新一次。
Handler mHandler1 = new Handler();
new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
while (true) {
try {
Thread.sleep(10000);
mHandler1.post(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
// creating GPS Class object
GPSTracker gps = new GPSTracker (Tracking .this);
// check if GPS location have some values
if (gps.canGetLocation()) {
double currentlat = gps.getLatitude();
double currentlong = gps.getLongitude();
} else {
// no current location
gps.showSettingsAlert();
}
}
});
} catch (Exception e) {
// TODO: handle exception
}
}
}
}).start();
答案 1 :(得分：1)
你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，仅为2秒。而且我认为GPS更新速度不快
看看这个。
相反，您可以使用相同的循环，但只有在与前一个循环不同时才存储该值。
if(oldLat != curLat){
//store curLat to array
//and make oldLat = curLat
}