我试图在后台获取服务，我从BroadcastReceiver调用它...这就是我的服务代码：
public class GPSTRACKER extends Service {
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 = 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;
@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)
{
if(canGetLocation()){
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*(-1)>0 && line*(-1)<0.001) || (line>0 && line<0.001)){
success=1;
break;
}
}
if (success==1){
break;
}
}else{
// can't get location
// GPS or Network is not enabled
// Ask user to enable GPS/network in settings
showSettingsAlert();
break;
}
}
if (success==1)
{
Toast poast = Toast.makeText(this, "I FOUND U", Toast.LENGTH_LONG);
poast.show();
}
}
}
public static double SlopeCalc(double y2,double y1, double x2,double x1){
double sou;
sou=(y2-y1)/(x2-x1);
return sou;
}
/**
* 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();
}
}
那就是我如何从broadcastReceiver中调用它：
public class SmsListener extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
Bundle bundle = intent.getExtras();
Object messages[] = (Object[]) bundle.get("pdus");
SmsMessage smsMessage[] = new SmsMessage[messages.length];
for (int n = 0; n < messages.length; n++) {
smsMessage[n] = SmsMessage.createFromPdu((byte[]) messages[n]);
}
Toast toast = Toast.makeText(context, "Received SMS: " + smsMessage[0].getMessageBody(), Toast.LENGTH_LONG);
toast.show();
String s=smsMessage[0].getMessageBody();
Intent intentone = new Intent(context.getApplicationContext(), GPSTRACKER.class);
intentone.putExtra("message", s);
context.startService(intentone);
abortBroadcast();
}
这就是我的logcat：
05-11 20:19:15.283: E/Gsm/SmsMessage(3677): hasUserDataHeader : false
05-11 20:19:15.408: E/AndroidRuntime(3867): FATAL EXCEPTION: main
05-11 20:19:15.408: E/AndroidRuntime(3867): java.lang.RuntimeException: Unable to instantiate service com.example.yeah.GPSTRACKER: java.lang.InstantiationException: com.example.yeah.GPSTRACKER
05-11 20:19:15.408: E/AndroidRuntime(3867): at android.app.ActivityThread.handleCreateService(ActivityThread.java:1933)
05-11 20:19:15.408: E/AndroidRuntime(3867): at android.app.ActivityThread.access$2500(ActivityThread.java:117)
05-11 20:19:15.408: E/AndroidRuntime(3867): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:989)
05-11 20:19:15.408: E/AndroidRuntime(3867): at android.os.Handler.dispatchMessage(Handler.java:99)
05-11 20:19:15.408: E/AndroidRuntime(3867): at android.os.Looper.loop(Looper.java:130)
05-11 20:19:15.408: E/AndroidRuntime(3867): at android.app.ActivityThread.main(ActivityThread.java:3691)
05-11 20:19:15.408: E/AndroidRuntime(3867): at java.lang.reflect.Method.invokeNative(Native Method)
05-11 20:19:15.408: E/AndroidRuntime(3867): at java.lang.reflect.Method.invoke(Method.java:507)
05-11 20:19:15.408: E/AndroidRuntime(3867): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907)
05-11 20:19:15.408: E/AndroidRuntime(3867): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)
05-11 20:19:15.408: E/AndroidRuntime(3867): at dalvik.system.NativeStart.main(Native Method)
05-11 20:19:15.408: E/AndroidRuntime(3867): Caused by: java.lang.InstantiationException: com.example.yeah.GPSTRACKER
05-11 20:19:15.408: E/AndroidRuntime(3867): at java.lang.Class.newInstanceImpl(Native Method)
05-11 20:19:15.408: E/AndroidRuntime(3867): at java.lang.Class.newInstance(Class.java:1409)
05-11 20:19:15.408: E/AndroidRuntime(3867): at android.app.ActivityThread.handleCreateService(ActivityThread.java:1930)
05-11 20:19:15.408: E/AndroidRuntime(3867): ... 10 more
任何帮助都会有帮助。