我有一个具有两个组件的Android应用
[有人可以告诉我将位置数据从服务传递回活动的最简单方法，无论活动是否显示给用户，该活动都将起作用。
我应该使用EventBus吗？广播接收器，本地广播管理器还是什么？
理想情况下，我想指出一个在GitHub（或类似版本）上的示例应用程序的方向，我可以下载它的工作方式以检查其工作方式，否则某些代码会很好。
这是您的服务：
<service
android:name=".Services.Service.GPSTracker"
android:exported="false" />
和java类：
import android.Manifest;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Criteria;
import android.location.GpsSatellite;
import android.location.GpsStatus;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.IBinder;
import android.provider.Settings;
import android.support.v4.app.ActivityCompat;
import android.util.Log;
import static android.location.GpsStatus.GPS_EVENT_SATELLITE_STATUS;
public class GPSTracker extends Service {
private 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
float bearing; // bearing
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 1; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000; // 5 sec
// Declaring a Location Manager
protected LocationManager locationManager;
protected LocationListener locationListenerNetwork;
protected LocationListener locationListenerGPS;
protected GpsStatus.Listener gpsStatusListener;
protected GpsListener gpsListener;
public GPSTracker(Context context, LocationListener listenerNetwork, LocationListener listenerGPS, GpsListener gpsListener) {
locationListenerGPS = listenerGPS;
locationListenerNetwork = listenerNetwork;
this.mContext = context;
this.gpsListener = gpsListener;
getLocation();
}
public GPSTracker() {
}
private GPSTracker(Context mContext) {
this.mContext = mContext;
}
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 && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return null;
}
final Criteria criteria = new Criteria();
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_HIGH);
criteria.setAccuracy(Criteria.ACCURACY_FINE);
final String p = locationManager.getBestProvider(criteria, true);
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, locationListenerGPS);
gpsStatusListener = new GpsStatus.Listener() {
@Override
public void onGpsStatusChanged(int event) {
if (event == GPS_EVENT_SATELLITE_STATUS) {
if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
GpsStatus status = locationManager.getGpsStatus(null);
Iterable<GpsSatellite> sats = status.getSatellites();
gpsListener.OnGpsSatelliteChanged(sats);
// Check number of satellites in list to determine fix state
}
}
};
locationManager.addGpsStatusListener(gpsStatusListener);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
bearing = location.getBearing();
}
}
}
}
if (isNetworkEnabled) {
if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return null;
}
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, locationListenerNetwork);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
bearing = location.getBearing();
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
*/
public void stopUsingGPSProvider() {
if (locationManager != null) {
locationManager.removeUpdates(locationListenerGPS);
}
}
public void stopUsingNetworkProvider() {
if (locationManager != null) {
locationManager.removeUpdates(locationListenerNetwork);
}
}
/**
* 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;
}
public float getBearing() {
if (location != null) {
bearing = location.getBearing();
}
return bearing;
}
/**
* 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 IBinder onBind(Intent arg0) {
return null;
}
public interface GpsListener {
void OnGpsSatelliteChanged(Iterable<GpsSatellite> gpsSatellites);
}
}
活动中：
GPSTracker gps;
LocationListener locationListenerNetwork = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
};
LocationListener locationListenerGPS = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
};
GPSTracker.GpsListener gpsListener = new GPSTracker.GpsListener() {
@Override
public void OnGpsSatelliteChanged(Iterable<GpsSatellite> gpsSatellites) {
}
};
void start(){
gps = new GPSTracker(this, locationListenerNetwork, locationListenerGPS, gpsListener);
}
void stop(){
if (gps != null) {
gps.stopUsingGPSProvider();
gps.stopUsingNetworkProvider();
}
}
@Override
protected void onPause() {
super.onPause();
stop();
}
@Override
protected void onResume() {
super.onResume();
start();
}
以上代码将在您的活动打开时运行gps，并开始向您的活动发送gps数据，并且如果活动进入后台或停止等等。gps也将停止（您也需要处理权限）。同样，如果即使在活动未打开的情况下也要获取gps数据，则可以制作一个List<location>并将其保存在服务中，并在重置活动后通过接口将其发送回（希望您知道如何创建接口并传递数据） ）;