我已经使用这个程序定期服用Gps但是我有例外，请给我解决方案
package com.excerciseTest;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import java.util.Locale;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.os.IBinder;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;
public class GpsService extends Service{
private Long counter = 0L;
private Timer timer = new Timer();
private final Calendar time = Calendar.getInstance();
private LocationManager locationManager;
private Location currentLocation;
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate()
{
super.onCreate();
/*Intent intent = new Intent(this, RepeatingAlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 0, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (5 * 1000), 10 * 1000,pendingIntent);
Toast.makeText(this, "Alarm set", Toast.LENGTH_LONG).show();
*/
try
{
_startService();
//Set Starting point of latitude and longitude
/*
counter=0L;
new CountDownTimer(3000, 1000) {
public void onTick(long millisUntilFinished) {
locationManager=(LocationManager)getSystemService(LOCATION_SERVICE);
locationManager.requestLocationUpdates("gps", (long)30000, (float) 10.0, new LocationListener()
{
public void onLocationChanged(Location arg0)
{
counter++;
System.out.println(counter);
handleLocationChanged(arg0);
/*
System.out.println("latitude"+lati.get(0).toString());
System.out.println("langitude"+lati.get(1).toString());
/*
if(counter==1)
{
checklatAt0=getLatitude();
checklonat0=getLongitude();
System.out.println("Latitude At 0"+checklatAt0);
System.out.println("Longitude At 0"+checklonat0);
}
if(counter==300)
{
checklatAt300=getLatitude();
checklonat300=getLongitude();
System.out.println("Latitude At 300"+checklatAt300);
System.out.println("Longitude At 300"+checklonat300);
counter = 0L;
}
System.out.println(counter);
counter++;
}
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
}
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
}
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
}
});
//mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
}
public void onFinish() {
//mTextField.setText("done!");
}
}.start();
*/
/*
timer.scheduleAtFixedRate(
new TimerTask(){
public void run()
{
/// Subscribe to the location manager's updates on the current location
locationManager.requestLocationUpdates("gps", (long)30000, (float) 10.0, new LocationListener()
{
public void onLocationChanged(final Location arg0)
{
ArrayList lati=handleLocationChanged(arg0);
System.out.println(lati.get(0).toString());
System.out.println(lati.get(1).toString());
if(counter==1)
{
checklatAt0=getLatitude();
checklonat0=getLongitude();
System.out.println("Latitude At 0"+checklatAt0);
System.out.println("Longitude At 0"+checklonat0);
}
if(counter==300)
{
checklatAt300=getLatitude();
checklonat300=getLongitude();
System.out.println("Latitude At 300"+checklatAt300);
System.out.println("Longitude At 300"+checklonat300);
counter = 0L;
}
System.out.println(counter);
counter++;
}
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
}
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
}
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
}
});
}
}, 0, 1000L);
*/
}
catch(Exception e)
{
e.printStackTrace();
}
}
private void _startService() {
counter=0L;
timer.scheduleAtFixedRate(
new TimerTask() {
public void run() {
counter++;
getLocatonUpdate(getApplicationContext());
}
},
0,
1000);
Log.i(getClass().getSimpleName(), "Timer started!!!");
}
@Override
public void onDestroy()
{
super.onDestroy();
// Cancel the persistent notification.
Toast.makeText(this, "Service destroyed at " + time.getTime() + "; counter is at: " + counter, Toast.LENGTH_LONG).show();
}
public void getLocatonUpdate(Context c)
{
locationManager=(LocationManager)c.getSystemService(c.LOCATION_SERVICE);
locationManager.requestLocationUpdates("gps", (long)30000, (float) 10.0, new LocationListener()
{
public void onLocationChanged(Location arg0)
{
System.out.println(counter);
handleLocationChanged(arg0);
}
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
}
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
}
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
}
});
}
private void handleLocationChanged(Location loc)
{
this.currentLocation = loc;
// Update the latitude & longitude TextViews
System.out.println(Double.toString(loc.getLatitude()));
System.out.println(Double.toString(loc.getLongitude()));
}
}
这是例外
02-11 19:05:06.930: ERROR/AndroidRuntime(614): FATAL EXCEPTION: Timer-0
02-11 19:05:06.930: ERROR/AndroidRuntime(614): java.lang.RuntimeException: Can't
create handler inside thread that has not called Looper.prepare()
02-11 19:05:06.930: ERROR/AndroidRuntime(614): at android.os.Handler.<init>
(Handler.java:121)
02-11 19:05:06.930: ERROR/AndroidRuntime(614): at
android.location.LocationManager$ListenerTransport$1.<init>(LocationManager.java:173)
02-11 19:05:06.930: ERROR/AndroidRuntime(614): at
android.location.LocationManager$ListenerTransport.<init>(LocationManager.java:173)
02-11 19:05:06.930: ERROR/AndroidRuntime(614): at
android.location.LocationManager._requestLocationUpdates(LocationManager.java:579)
02-11 19:05:06.930: ERROR/AndroidRuntime(614): at
android.location.LocationManager.requestLocationUpdates(LocationManager.java:446)
02-11 19:05:06.930: ERROR/AndroidRuntime(614): at
com.excerciseTest.GpsService.getLocatonUpdate(GpsService.java:262)
02-11 19:05:06.930: ERROR/AndroidRuntime(614): at
com.excerciseTest.GpsService$1.run(GpsService.java:239)
02-11 19:05:06.930: ERROR/AndroidRuntime(614): at
java.util.Timer$TimerImpl.run(Timer.java:284)
答案 0 :(得分：1)
您应该从getLocatonUpdate开始接听TimerTask。
引发异常是因为LocationManager.requestLocationUpdates必须从Looper线程调用，例如主线程（请参阅docs for LocationManager）。
计时器线程不是Looper线程。您可以将其设为一个，但不需要：requestLocationUpdates()已经定期通知您的回调。
答案 1 :(得分：0)
当您创建多个线程并希望从其中一个线程更新UI时，通常会发生此错误。
您需要创建一个Handler来发送和捕获来自不同线程的消息到主UI线程（Activity类），以便使用您在该Activity类中定义的方法。
有关如何在线程中使用处理程序的示例，Android给出了creating ProgressDialogs with a second thread的示例，如果您在该部分中扩展了“带有第二个线程的示例ProgressDialog”标题。
您必须在代码中使用相同的意识形态。