Android AsyncTask& LocationListener的 [英] Android AsyncTask & LocationListener
本文介绍了Android AsyncTask& LocationListener的的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我创建了一个类 GPSController 。 onReceive被称为每分钟。
I created a class GPSController. The onReceive is called every Minute.
我想在 AsyncTask 中使用 GPSListener code>。
但是 onLocationChanged 方法永远不会被调用。 ： - /
I want to get the current GPS Data with the GPSListener in my AsyncTask.
But the onLocationChanged Method is never called. :-/
以下是我的课程：
Here is my Class:
public class GPSController extends SensorTimeController {
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 0;
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 2;
private boolean isGPSEnabled = false;
private boolean isNetworkEnabled = false;
private double latitude = -1;
private double longitude = -1;
private double altitude = -1;
private double speed = 0L;
private double bearing = 0L;
private LocationManager locationManager;
private GPSLocationTask backgroundTask;
public GPSController(GPSModule module) {
super(module);
backgroundTask = new GPSLocationTask();
}
private void SensorDataFinished(double longitude, double latitude, double altitude, double speed, double bearing) {
Date date = new Date(System.currentTimeMillis());
SensorRecord record = new SensorRecord(module.getNextIndex(), date, structure);
if (longitude != -1)
record.addData("longitude", String.valueOf(longitude));
else
record.addData("longitude", " ");
if (latitude != -1)
record.addData("latitude", String.valueOf(longitude));
else
record.addData("latitude", " ");
if (altitude != -1)
record.addData("altitude", String.valueOf(altitude));
else
record.addData("altitude", " ");
if (bearing != 0L)
record.addData("bearing", String.valueOf(bearing));
else
record.addData("bearing", " ");
if (speed != 0L)
record.addData("speed", String.valueOf(speed));
else
record.addData("speed", " ");
module.log(record);
}
@Override
public void onReceive(Context context, Intent intent) {
locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
backgroundTask.execute();
}
private class GPSLocationTask extends AsyncTask<Void, Void, Void> implements LocationListener {
@Override
protected Void doInBackground(Void... params) {
System.out.println("THREAD STARTED");
try {
Looper.prepare();
Looper.loop();
if(isNetworkEnabled)
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
if(isGPSEnabled)
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
}catch(SecurityException e) {
e.printStackTrace();
}
return null;
}
public void onLocationChanged(Location location) {
if (location != null) {
longitude = location.getLongitude();
latitude = location.getLatitude();
altitude = location.getAltitude();
// don't do anything if we get a null reading for some reason
if (longitude == 0.0f && latitude == 0.0f)
return;
// any speed information?
if (location.hasSpeed())
speed = (double) location.getSpeed();
// any bearing information?
if (location.hasBearing())
bearing = (double) location.getBearing();
System.out.println(longitude+", "+ latitude+", "+ altitude+", "+ speed+", "+ bearing);
SensorDataFinished(longitude, latitude, altitude, speed, bearing);
}
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
}
推荐答案
这个类提供当前经纬度，日志和In onLocationChanged您可以调用每个分钟调用的AsyncTask。
This class provide current lat , log and In onLocationChanged method you can call AsyncTask called every Minute.
public class GPSTracker extends Service implements LocationListener {
private static final String TAG = GPSTracker.class.getSimpleName();
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = true;
// 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) {
} else {
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
canGetLocation = true;
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
// SharedPreferenceUtil.putValue(Preferences.TAG_LATITUDE,""+latitude);
// SharedPreferenceUtil.putValue(Preferences.TAG_LONGITUDE,""+longitude);
// SharedPreferenceUtil.save();
// Preferences.TAG_G_L = "G";
Log.d("gps", latitude + "," + longitude);
}
}
} else {
canGetLocation = false;
Log.d("gps", "GPS Disable");
}
}
}
if (!isNetworkEnabled) {
// no network provider is enabled
} else {
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
// Preferences.TAG_G_L = "L";
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
// SharedPreferenceUtil.putValue(Preferences.TAG_LATITUDE,""+latitude);
// SharedPreferenceUtil.putValue(Preferences.TAG_LONGITUDE,""+longitude);
// SharedPreferenceUtil.save();
Log.d("network", latitude + "," + longitude);
}
}
Log.d("network", latitude + "," + longitude);
}
}
/* if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
// First get location from Network Provider
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();
SharedPreferenceUtil.putValue(Preferences.TAG_LATITUDE,""+latitude);
SharedPreferenceUtil.putValue(Preferences.TAG_LONGITUDE,""+longitude);
SharedPreferenceUtil.save();
Log.d("gps",latitude+","+longitude);
}
}
}
// 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();
SharedPreferenceUtil.putValue(Preferences.TAG_LATITUDE,""+latitude);
SharedPreferenceUtil.putValue(Preferences.TAG_LONGITUDE,""+longitude);
SharedPreferenceUtil.save();
Log.d("gps",latitude+","+longitude);
}
}
}
}
}*/
} 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
*
* @return double
*/
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) {
Log.e(TAG, "onLocationChanged: " + location.toString());
}
@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;
}
}
我希望这对您有所帮助。 。！
I hope it's help to you..!
这篇关于Android AsyncTask& LocationListener的的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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