我需要检测我的应用的用户何时进入新的国家/地区。我希望有一些我可以使用的听众，并考虑检测电话运营商何时更改并在这些情况下快速检查当前国家/地区。
有更好的方法吗？
每次电池塔发生变化时，我都不想触发检查......这不仅仅是在手机清醒时才有效，但它也可能经常发生并且不是理想的
答案 0 :(得分：0)
添加这些权限
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
为GPSTracker.java
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;
public class GPSTracker extends Service implements LocationListener {
private final Activity mActivity;
boolean isGPSEnabled = false;
boolean isNetworkEnabled = false;
boolean canGetLocation = false;
Location location;
double latitude;
double longitude;
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10;
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1;
protected LocationManager locationManager;
public GPSTracker(Activity mActivity) {
this.mActivity = mActivity;
getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager) mActivity
.getSystemService(LOCATION_SERVICE);
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
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);
updateGPSCoordinates();
}
}
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);
updateGPSCoordinates();
}
}
}
}
} catch (Exception e) {
Log.e("Error : Location",
"Impossible to connect to LocationManager", e);
}
return location;
}
public void updateGPSCoordinates() {
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
public void stopUsingGPS() {
if (locationManager != null) {
locationManager.removeUpdates(GPSTracker.this);
}
}
public double getLatitude() {
if (location != null) {
latitude = location.getLatitude();
}
return latitude;
}
public double getLongitude() {
if (location != null) {
longitude = location.getLongitude();
}
return longitude;
}
public boolean canGetLocation() {
return this.canGetLocation;
}
public void showSettingsAlert() {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mActivity);
alertDialog.setTitle("GPS Settings");
alertDialog.setMessage("Enable GPS Settings For Accessing Camera");
alertDialog.setCancelable(false);
alertDialog.setPositiveButton("Settings",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(
Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mActivity.startActivity(intent);
}
});
alertDialog.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
mActivity.finish();
}
});
alertDialog.show();
}
public List<Address> getGeocoderAddress(Context context) {
if (location != null) {
Geocoder geocoder = new Geocoder(context, Locale.ENGLISH);
try {
List<Address> addresses = geocoder.getFromLocation(latitude,
longitude, 1);
return addresses;
} catch (IOException e) {
Log.e("Error : Geocoder", "Impossible to connect to Geocoder",
e);
}
}
return null;
}
public String getAddressLine(Context context) {
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0) {
Address address = addresses.get(0);
String addressLine = address.getAddressLine(0);
return addressLine;
} else {
return null;
}
}
public String getLocality(Context context) {
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0) {
Address address = addresses.get(0);
String locality = address.getLocality();
return locality;
} else {
return null;
}
}
public String getPostalCode(Context context) {
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0) {
Address address = addresses.get(0);
String postalCode = address.getPostalCode();
return postalCode;
} else {
return null;
}
}
public String getCountryName(Context context) {
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0) {
Address address = addresses.get(0);
String countryName = address.getCountryName();
return countryName;
} else {
return null;
}
}
@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 IBinder onBind(Intent intent) {
return null;
}
}
现在创建一个计时器任务或来自asynchronous task的无限循环，并延迟并检查国家/地区
public class MainActivity extends Activity {
private SharedPreferences mSharedPreferences;
private SharedPreferences.Editor mEditor;
private static final String COUNTRY_KEY = "country_key";
private CountDownTimer mTimer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSharedPreferences = getSharedPreferences(
MainActivity.this.getCallingPackage(), Context.MODE_PRIVATE);
mEditor = mSharedPreferences.edit();
final GPSTracker gpsTracker = new GPSTracker(this);
mTimer = new CountDownTimer(Long.MAX_VALUE,10 * 1000) {
@Override
public void onTick(long millisUntilFinished) {
if (gpsTracker.canGetLocation()) {
Geocoder geoCoder = new Geocoder(getBaseContext(),
Locale.getDefault());
try {
List<Address> addresses = geoCoder.getFromLocation(gpsTracker.latitude,
gpsTracker.longitude, 1);
if (addresses.size() > 0) {
String country = addresses.get(0).getCountryName();
if(mSharedPreferences.getString(COUNTRY_KEY, null) == null){
//This is the first entry
mEditor.putString(COUNTRY_KEY, country);
mEditor.commit();
}else{
String savedCountry = mSharedPreferences.getString(COUNTRY_KEY, null);
if(!savedCountry.equals(country)){
//Now the country has changed so do your stuff
Toast.makeText(MainActivity.this, "Country Has changed to " + country,
Toast.LENGTH_LONG).show();
//Also save the country to preferences if you want
//mEditor.putString(COUNTRY_KEY, country);
//mEditor.commit();
}
}
}
} catch (IOException e1) {
e1.printStackTrace();
}
} else {
gpsTracker.showSettingsAlert();
}
}
@Override
public void onFinish() {}
};
mTimer.start();
}
}