当 GPS 被禁用时,您可以使用 Intent Intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
启用它,但是当我返回到 Activity 时,我没有得到任何结果。我必须重新启动该 Activity ,换句话说,我必须返回到上一个 Activity ,然后重新打开它。请你帮助我好吗?
这是我的 doInBackground
方法:
@Override
protected String doInBackground(String... uri){
final GPSTracker gpsTracker = new GPSTracker(myactivity);
final String[] latitudine = {null};
final String[] longitudine = {null};
if(gpsTracker.canGetLocation())
{
latitudine[0] = String.valueOf(gpsTracker.latitude);
longitudine[0] = String.valueOf(gpsTracker.longitude);
}
else
{
myactivity.runOnUiThread(new Runnable() {
public void run() {
final Dialog dialog = new Dialog(myactivity);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.position_alert_dialog);
Button dialogButton_deny = (Button) dialog.findViewById(R.id.deny);
Button dialogButton_allow = (Button) dialog.findViewById(R.id.allow);
dialogButton_allow.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
myactivity.startActivity(intent);
dialog.dismiss();
if(gpsTracker.canGetLocation())
{
latitudine[0] = String.valueOf(gpsTracker.latitude);
longitudine[0] = String.valueOf(gpsTracker.longitude);
}else{
latitudine[0] = "34.0522300";
longitudine[0] = "-118.2436800";
}
}
});
dialogButton_deny.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
dialog.show();
}
});
}
GPSTracker
:
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
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; //10 meters
private static final long MIN_TIME_BW_UPDATES = 1000 * 60; // 1 minute
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this, Looper.getMainLooper());
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) {
//e.printStackTrace();
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) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// public void requestPermissions(@NonNull String[] permissions, int requestCode)
// 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 Activity#requestPermissions for more details.
return;
}
}
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 List<Address> getGeocoderAddress(Context context)
{
if (location != null)
{
Geocoder geocoder = new Geocoder(context, Locale.ENGLISH);
try
{
return geocoder.getFromLocation(latitude, longitude, 1);
}
catch (IOException e)
{
//e.printStackTrace();
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);
return address.getAddressLine(0);
}
else
{
return null;
}
}
public String getLocality(Context context)
{
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0)
{
Address address = addresses.get(0);
return address.getLocality();
}
else
{
return null;
}
}
public String getSubLocality(Context context)
{
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0)
{
Address address = addresses.get(0);
return address.getSubLocality();
}
else
{
return null;
}
}
public String getPostalCode(Context context)
{
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0)
{
Address address = addresses.get(0);
return address.getPostalCode();
}
else
{
return null;
}
}
public String getCountryName(Context context)
{
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0)
{
Address address = addresses.get(0);
return address.getCountryName();
}
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;
}
}
编辑
public class GPSTracker extends Service implements LocationListener, GoogleApiClient.ConnectionCallbacks {
private final Context mContext;
boolean isPlayServicesEnabled = false;
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; //10 meters
private static final long MIN_TIME_BW_UPDATES = 1000 * 60; // 1 minute
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
}
public Location getLocation() {
try {
locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this, Looper.getMainLooper());
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) {
//e.printStackTrace();
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) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// public void requestPermissions(@NonNull String[] permissions, int requestCode)
// 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 Activity#requestPermissions for more details.
return;
}
}
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 List<Address> getGeocoderAddress(Context context) {
if (location != null) {
Geocoder geocoder = new Geocoder(context, Locale.ENGLISH);
try {
return geocoder.getFromLocation(latitude, longitude, 1);
} catch (IOException e) {
//e.printStackTrace();
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);
return address.getAddressLine(0);
} else {
return null;
}
}
public String getLocality(Context context) {
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0) {
Address address = addresses.get(0);
return address.getLocality();
} else {
return null;
}
}
public String getSubLocality(Context context) {
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0) {
Address address = addresses.get(0);
return address.getSubLocality();
} else {
return null;
}
}
public String getPostalCode(Context context) {
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0) {
Address address = addresses.get(0);
return address.getPostalCode();
} else {
return null;
}
}
public String getCountryName(Context context) {
List<Address> addresses = getGeocoderAddress(context);
if (addresses != null && addresses.size() > 0) {
Address address = addresses.get(0);
return address.getCountryName();
} else {
return null;
}
}
@Override
public void onLocationChanged(Location location) {
this.location = location;
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onConnected(Bundle connectionHint) {
isPlayServicesEnabled = true;
getLocation();
}
@Override
public void onConnectionSuspended(int cause) {
isPlayServicesEnabled = false;
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
}
这是我调用 AsyncTask 的地方:
public class Weather extends AppCompatActivity{
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.meteo_nuovo);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar_layout);
setSupportActionBar(toolbar);
toolbar.setPadding(0, getStatusBarHeight(), 0, 0);
assert getSupportActionBar() != null;
this.getSupportActionBar().setDisplayHomeAsUpEnabled(true);
this.getSupportActionBar().setDisplayShowTitleEnabled(false);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
getWindow().getDecorView().setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
}
new WeatherApi(this).execute(); // the doInBackground method above is from this class
}
public int getStatusBarHeight() {
int result = 0;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
result = getResources().getDimensionPixelSize(resourceId);
}
}
return result;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
最佳答案
据我遇到过这个问题,但我已经用自己的方式解决了。
在您的 GPSTracker
类中创建一个方法。
public void onActivityResult(int requestCode, int resultcode, Intent data) {
}
现在使用 startActivityForResult
而不是 startActivity
启动 Activity ,
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivityForResult(intent, 0);
现在,当您返回 onActivityResult
方法时,您的 Activity 中
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
gpsTracker.onActivityResult(requestCode, resultCode, data);// This line is more important
if (requestCode == 0) {
handler.sendEmptyMessage(0);
}
}
现在处理程序
是
android.os.Handler handler = new android.os.Handler(new android.os.Handler.Callback() {
@Override
public boolean handleMessage(Message message) {
try {
Location location = gpsTracker.getLocation();
latitude = location.getLatitude();
longitude = location.getLongitude();
} catch (Exception e) {
Log.v("Error:", "Location is null");
}
return false;
}
});
使用这个你可以立即知道我得到的位置。也许会有帮助。就我而言,它工作正常。
关于android - 未检索到纬度和经度,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34571942/