无论何时需要启动应用程序崩溃，服务都无法启动......
这就是我的服务代码：
public class GPSTRACKER extends Service {
//private final Context mContext=getBaseContext();
// 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 = 1;
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 60 ;
// Declaring a Location Manager
protected LocationManager locationManager;
//public GPSTRACKER(Context context) {
//this.mContext = context;
//}
WakeLock wakeLock;
public Location getLocation() {
locationManager = (LocationManager)
getSystemService(LOCATION_SERVICE);
//getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, (LocationListener) this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
}
}
// 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, (LocationListener) this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
}
}
}
return location;
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "DoNotSleep");
}
@Override
public void onStart(Intent intent, int startId) {
Bundle extras = intent.getExtras();
if (extras != null && !extras.isEmpty()) { // has effect of unparcelling Bundle
String message = intent.getStringExtra("message");
int p=0,j,i=1,t,success=0;
double[] d = new double[1000];
Matcher m = Pattern.compile("(?!=\\d\\.\\d\\.)([\\d.]+)").matcher(message);
while(m.find())
{
double k = Double.parseDouble(m.group(1));
d[p]=k;
p++;
}
double line;
double[] ship = new double[1000] ;
double[] b = new double[1000] ;
ship[0]=SlopeCalc(d[2],d[0],d[3],d[1]);
b[0]=d[0]-ship[0]*d[1];
System.out.println(ship[0]);
if (p>3)
{
for(j=2;j<p;j++)
{
if(j+2<p){
ship[i]=SlopeCalc(d[j+2],d[j-2+2],d[j+1+2],d[j-1+2]);
b[i]=d[j]-(ship[i]*d[j+1]);
j++;
i++;
}
else{
break;
}
}
}
while(true)
{
latitude = location.getLatitude();
longitude = location.getLongitude();
for (t=0;t<i;t++){
line=ship[t]*longitude+b[t]-latitude;
System.out.println(line);
if (line>-0.001 && line<0.001){
success=1;
break;
}
}
if (success==1){
break;
}
}
System.out.println(success);
}
else
{
Log.i("Log", "Bundle is null");
}
}
public static double SlopeCalc(double y2,double y1, double x2,double x1){
double sou;
sou=(y2-y1)/(x2-x1);
return sou;
}
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates((LocationListener) 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 void onDestroy() {
super.onDestroy();
wakeLock.release();
}
}
那就是我的logcat：
05-11 21:45:53.943: E/Gsm/SmsMessage(15704): hasUserDataHeader : false
05-11 21:45:54.093: E/AndroidRuntime(15848): FATAL EXCEPTION: main
05-11 21:45:54.093: E/AndroidRuntime(15848): java.lang.RuntimeException: Unable to start service com.example.yeah.GPSTRACKER@40555c40 with Intent { cmp=com.example.yeah/.GPSTRACKER (has extras) }: java.lang.NullPointerException
05-11 21:45:54.093: E/AndroidRuntime(15848): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2056)
05-11 21:45:54.093: E/AndroidRuntime(15848): at android.app.ActivityThread.access$2800(ActivityThread.java:117)
05-11 21:45:54.093: E/AndroidRuntime(15848): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:998)
05-11 21:45:54.093: E/AndroidRuntime(15848): at android.os.Handler.dispatchMessage(Handler.java:99)
05-11 21:45:54.093: E/AndroidRuntime(15848): at android.os.Looper.loop(Looper.java:130)
05-11 21:45:54.093: E/AndroidRuntime(15848): at android.app.ActivityThread.main(ActivityThread.java:3691)
05-11 21:45:54.093: E/AndroidRuntime(15848): at java.lang.reflect.Method.invokeNative(Native Method)
05-11 21:45:54.093: E/AndroidRuntime(15848): at java.lang.reflect.Method.invoke(Method.java:507)
05-11 21:45:54.093: E/AndroidRuntime(15848): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907)
05-11 21:45:54.093: E/AndroidRuntime(15848): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)
05-11 21:45:54.093: E/AndroidRuntime(15848): at dalvik.system.NativeStart.main(Native Method)
05-11 21:45:54.093: E/AndroidRuntime(15848): Caused by: java.lang.NullPointerException
05-11 21:45:54.093: E/AndroidRuntime(15848): at com.example.yeah.GPSTRACKER.onStart(GPSTRACKER.java:121)
05-11 21:45:54.093: E/AndroidRuntime(15848): at android.app.Service.onStartCommand(Service.java:428)
05-11 21:45:54.093: E/AndroidRuntime(15848): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2043)
05-11 21:45:54.093: E/AndroidRuntime(15848): ... 10 more
P.s：继续我的上一个问题：Service doesnt start ! !?