我已经多次搜索过，并通过询问这类问题尝试了解决方案。但没有帮助。所以我想我的代码可能存在一些问题。
我的应用程序的主要座右铭是在每分钟跟踪gps位置并发送到服务器。并且还做了一些服务器事务。所以我想开始一个后台服务，并通过asynctask在服务中做所有gps和服务器的东西。应用程序正在运行，但执行速度很慢......
我在主要活动中开始了我的服务：
private void startworks() {
Calendar cal = Calendar.getInstance();
Intent intent = new Intent(this, NewService.class);
PendingIntent pintent = PendingIntent.getService(this, 0, intent, 0);
alarm.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(),
45 * 1000, pintent);
}
@Override
protected void onStart() {
super.onStart();
startworks();
}
关于我的服务..我在这里提供了一个......
public class NewService extends Service {
String servicestring;
String lastId = "";
String holdLastId = "";
private static final String NotificationUrl = "some url";
private static final double LATITUDE = 12.9056742;
private static final double LONGITUDE = 77.6512342;
public static final int MSG_INCREMENT = 1;
public static final int MSG_COUNTER = 2;
private final IBinder mBinder = new ServiceBinder();
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
toggleGPSOn();
sendnotification();
WifiManager wm = (WifiManager) getSystemService(WIFI_SERVICE);
if (!wm.isWifiEnabled()) {
wm.setWifiEnabled(true);
} else {
// wm.setWifiEnabled(false);
}
// ************************Fetch InTime*******************************
AsyncTime getDate = new AsyncTime();
String returnedDateTime = "";
try {
returnedDateTime = getDate.execute().get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
if (returnedDateTime.equals("2013-09-18 14:11:01.000")) {
Toast.makeText(this, "It exits", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "It doesn't exits", Toast.LENGTH_SHORT).show();
}
// *****************************----****************************************
FetchCordinates async = new FetchCordinates();
async.execute();
return START_STICKY;
}
public class ServiceBinder extends Binder {
NewService getService() {
return NewService.this;
}
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
public void setAlarmReminder(Calendar c) {
new AlarmReminderTask(this, c).run();
}
private void toggleGPSOn() {
String provider = Settings.Secure.getString(getContentResolver(),
Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
if (!provider.contains("gps")) {
final Intent poke = new Intent();
poke.setClassName("com.android.settings",
"com.android.settings.widget.SettingsAppWidgetProvider");
poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
poke.setData(Uri.parse("3"));
sendBroadcast(poke);
}
}
public class FetchCordinates extends AsyncTask<String, Integer, String> {
public double lati = 0.0;
public double longi = 0.0;
String serverLatitude = "";
String serverLongitude = "";
String dateString;
public LocationManager mLocationManager;
public MyLocationListener mVeggsterLocationListener;
@Override
protected void onPreExecute() {
Criteria myCriteria = new Criteria();
myCriteria.setAccuracy(Criteria.ACCURACY_MEDIUM);
myCriteria.setPowerRequirement(Criteria.POWER_LOW);
mVeggsterLocationListener = new MyLocationListener();
mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
String myProvider = mLocationManager.getBestProvider(myCriteria,
true);
mLocationManager.requestLocationUpdates(myProvider, 500, 5,
mVeggsterLocationListener);
}
private double distance(double lat1, double lon1, double lat2,
double lon2) {
double theta = lon1 - lon2;
double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2))
+ Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2))
* Math.cos(deg2rad(theta));
dist = Math.acos(dist);
dist = rad2deg(dist);
dist = dist * 60 * 1.1515;
return (dist);
}
private double deg2rad(double deg) {
return (deg * Math.PI / 180.0);
}
private double rad2deg(double rad) {
return (rad * 180.0 / Math.PI);
}
public double round(double unrounded) {
BigDecimal bd = new BigDecimal(unrounded * 1.609344f);
BigDecimal rounded = bd.setScale(1, BigDecimal.ROUND_CEILING);
Log.d("Distance Is:", "Currentlly you are " + rounded.doubleValue()
* 1000 + " meters " + "distance from Last Distance");
return rounded.doubleValue() * 1000;
}
@Override
protected String doInBackground(String... params) {
while (this.lati == 0.0) {
}
return null;
}
public class MyLocationListener implements LocationListener {
@Override
public void onLocationChanged(Location location) {
try {
SimpleDateFormat fmt = new SimpleDateFormat(
"dd-MM-yyyy-HH:mm:ss");
Date date = new Date();
dateString = fmt.format(date);
Log.d("DateString", dateString);
lati = location.getLatitude();
longi = location.getLongitude();
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onProviderDisabled(String provider) {
Log.i("OnProviderDisabled", "OnProviderDisabled");
}
@Override
public void onProviderEnabled(String provider) {
Log.i("onProviderEnabled", "onProviderEnabled");
}
@Override
public void onStatusChanged(String provider, int status,
Bundle extras) {
Log.i("onStatusChanged", "onStatusChanged");
}
}
@Override
protected void onCancelled() {
mLocationManager.removeUpdates(mVeggsterLocationListener);
}
@Override
protected void onPostExecute(String result) {
Log.d("Post Execute", "Executed");
super.onPostExecute(result);
float[] arr = new float[30];
if (round(distance(LATITUDE, LONGITUDE, lati, longi)) < 500) {
Log.d("OnPostExecute", "In");
sendServiceActiveBroadcast(true);
Thread swipeInThread = new Thread() {
@Override
public void run() {
super.run();
try {
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(
"url...");
HttpResponse responses = client.execute(post);
int status = responses.getStatusLine()
.getStatusCode();
Log.d("Status", String.valueOf(status));
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
};
swipeInThread.start();
} else if (round(distance(LATITUDE, LONGITUDE, lati, longi)) > 500
&& round(distance(LATITUDE, LONGITUDE, lati, longi)) < 600) {
Log.d("OnPostExecute", "Out");
sendServiceActiveBroadcast(false);
} else {
}
}
private final void sendServiceActiveBroadcast(final boolean pActivate) {
final Intent _intent = new Intent();
_intent.setAction(BROADCAST_ACTION);
_intent.putExtra("isactive", pActivate);
NewService.this.sendBroadcast(_intent);
}
}
class AsyncTime extends AsyncTask<Void, Void, String> {
@Override
protected String doInBackground(Void... v) {
String getDateTime = "";
try {
HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet(
"url..");
HttpResponse responses = client.execute(get);
int status = responses.getStatusLine().getStatusCode();
Log.d("Status For Get", String.valueOf(status));
BufferedReader bf = new BufferedReader(new InputStreamReader(
responses.getEntity().getContent()));
String datas = "";
while ((datas = bf.readLine()) != null) {
Log.d("data", datas);
try {
JSONObject jsonStuffs = new JSONObject(datas);
getDateTime = jsonStuffs.getString("inTime");
} catch (JSONException e) {
e.printStackTrace();
}
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return getDateTime;
}
}
我知道我在这里分享了一个巨大的代码。但对我来说最重要的是分享这个。
任何建议和帮助都是值得赞赏的。
谢谢
答案 0 :(得分：2)
我认为问题在于此代码returnedDateTime = getDate.execute().get();
参与此get method
get方法也许等待你的doinBackground工作完成，这将导致等待MainThread并使你的应用变慢;
希望得到这个帮助。
答案 1 :(得分：1)
执行此操作的正确方法是使用侦听器，以便您可以接收更新，然后将其发送到服务器。此外，你应该采取一种策略来沟通你不会耗尽电池。
请查看Location Strategies guide，您将更好地了解如何达到您想要的效果。
答案 2 :(得分：1)
首先，您扩展Service，这意味着您的所有服务代码都在主线程（toggleGPSOn，sendnotification ...）中运行。您可以扩展IntentService而不是onStartCommand将在单独的线程中执行。在这种情况下，您甚至不需要AsyncTaks。
其次，AsyncTask并不像看起来那么简单。在新的机器人上，它是一个单线程队列。因此，您的服务任务有时会阻止应用程序任务。
最后，如果你真的有一个繁重的服务，并且你不能在一个过程中适应所有，你可以在单独的过程中运行服务，并使用IPC在服务和主应用程序之间进行通信。