State 的显示名称以及 Android 中的纬度和经度
[英]Display Name of the State along with Latitude and Longitude in Android
问题描述
Initially I displayed the current latitude and longitude in the application using the following code:
最初，我使用以下代码在应用程序中显示当前的纬度和经度：
package com.coders.location;
import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationCallback;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationResult;
import com.google.android.gms.location.LocationServices;
import java.util.Locale;
public class MainActivity extends AppCompatActivity {
private FusedLocationProviderClient mFusedLocationClient;
private double wayLatitude = 0.0, wayLongitude = 0.0;
private LocationRequest locationRequest;
private LocationCallback locationCallback;
private android.widget.Button btnLocation;
private TextView txtLocation;
private android.widget.Button btnContinueLocation;
private TextView txtContinueLocation;
private StringBuilder stringBuilder;
private boolean isContinue = false;
private boolean isGPS = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.txtContinueLocation = (TextView) findViewById(R.id.txtContinueLocation);
this.btnContinueLocation = (Button) findViewById(R.id.btnContinueLocation);
this.txtLocation = (TextView) findViewById(R.id.txtLocation);
this.btnLocation = (Button) findViewById(R.id.btnLocation);
mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
locationRequest = LocationRequest.create();
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationRequest.setInterval(10 * 1000); // 10 seconds
locationRequest.setFastestInterval(5 * 1000); // 5 seconds
new GpsUtils(this).turnGPSOn(new GpsUtils.onGpsListener() {
@Override
public void gpsStatus(boolean isGPSEnable) {
// turn on GPS
isGPS = isGPSEnable;
}
});
locationCallback = new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult) {
if (locationResult == null) {
return;
}
*******************************************************
for (Location location : locationResult.getLocations()) {
if (location != null) {
wayLatitude = location.getLatitude();
wayLongitude = location.getLongitude();
if (!isContinue) {
txtLocation.setText(String.format(Locale.US, "%s - %s", wayLatitude, wayLongitude));
} else {
stringBuilder.append(wayLatitude);
stringBuilder.append("-");
stringBuilder.append(wayLongitude);
stringBuilder.append("\n\n");
txtContinueLocation.setText(stringBuilder.toString());
}
*******************************************************
if (!isContinue && mFusedLocationClient != null) {
mFusedLocationClient.removeLocationUpdates(locationCallback);
}
}
}
}
};
btnLocation.setOnClickListener(v -> {
if (!isGPS) {
Toast.makeText(this, "Please turn on GPS", Toast.LENGTH_SHORT).show();
return;
}
isContinue = false;
getLocation();
});
btnContinueLocation.setOnClickListener(v -> {
if (!isGPS) {
Toast.makeText(this, "Please turn on GPS", Toast.LENGTH_SHORT).show();
return;
}
isContinue = true;
stringBuilder = new StringBuilder();
getLocation();
});
}
private void getLocation() {
if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION},
AppConstants.LOCATION_REQUEST);
} else {
if (isContinue) {
mFusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, null);
} else {
mFusedLocationClient.getLastLocation().addOnSuccessListener(MainActivity.this, location -> {
if (location != null) {
wayLatitude = location.getLatitude();
wayLongitude = location.getLongitude();
txtLocation.setText(String.format(Locale.US, "%s - %s", wayLatitude, wayLongitude));
} else {
mFusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, null);
}
});
}
}
}
@SuppressLint("MissingPermission")
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case 1000: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (isContinue) {
mFusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, null);
} else {
mFusedLocationClient.getLastLocation().addOnSuccessListener(MainActivity.this, location -> {
if (location != null) {
wayLatitude = location.getLatitude();
wayLongitude = location.getLongitude();
txtLocation.setText(String.format(Locale.US, "%s - %s", wayLatitude, wayLongitude));
} else {
mFusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, null);
}
});
}
} else {
Toast.makeText(this, "Permission denied", Toast.LENGTH_SHORT).show();
}
break;
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if (requestCode == AppConstants.GPS_REQUEST) {
isGPS = true; // flag maintain before get location
}
}
}
}
When I did this the code was working well.当我这样做时，代码运行良好。 Then I tried to update the code as I needed to display the State of the current location as well "ie Display the state in where the users Phone is currently located(eg South Carolina, Massachusetts, California, etc.).然后我尝试更新代码，因为我需要显示当前位置的 State 以及“即在用户电话当前所在的位置（例如南卡罗来纳州、马萨诸塞州、加利福尼亚州等）显示 state。
This was the updated code:这是更新的代码：
package com.coders.location;
import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationCallback;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationResult;
import com.google.android.gms.location.LocationServices;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
public class MainActivity extends AppCompatActivity {
private FusedLocationProviderClient mFusedLocationClient;
private double wayLatitude = 0.0, wayLongitude = 0.0;
private LocationRequest locationRequest;
private LocationCallback locationCallback;
private android.widget.Button btnLocation;
private TextView txtLocation;
private android.widget.Button btnContinueLocation;
private TextView txtContinueLocation;
private StringBuilder stringBuilder;
private boolean isContinue = false;
private boolean isGPS = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.txtContinueLocation = (TextView) findViewById(R.id.txtContinueLocation);
this.btnContinueLocation = (Button) findViewById(R.id.btnContinueLocation);
this.txtLocation = (TextView) findViewById(R.id.txtLocation);
this.btnLocation = (Button) findViewById(R.id.btnLocation);
mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
locationRequest = LocationRequest.create();
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationRequest.setInterval(10 * 1000); // 10 seconds
locationRequest.setFastestInterval(5 * 1000); // 5 seconds
new GpsUtils(this).turnGPSOn(new GpsUtils.onGpsListener() {
@Override
public void gpsStatus(boolean isGPSEnable) {
// turn on GPS
isGPS = isGPSEnable;
}
});
locationCallback = new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult) {
if (locationResult == null) {
return;
}
*******************************************************
for (Location location : locationResult.getLocations()) {
if (location != null) {
wayLatitude = location.getLatitude();
wayLongitude = location.getLongitude();
double latitude = location.getLatitude();
double longitude = location.getLongitude();
Geocoder gc = new Geocoder(getApplicationContext(), Locale.getDefault());
try {
List<Address> addresses = gc.getFromLocation(latitude, longitude, 1);
if (addresses.size() > 0) {
Address address = addresses.get(0);
for (int i = 0; i < address.getMaxAddressLineIndex(); i++)
stringBuilder.append(address.getAddressLine(i)).append("\n");
stringBuilder.append(address.getLocality()).append("\n");
stringBuilder.append(address.getPostalCode()).append("\n");
stringBuilder.append(address.getCountryName());
}
} catch (IOException e){
}
if (!isContinue) {
txtLocation.setText(stringBuilder.toString());
} else {
stringBuilder.append(wayLatitude);
stringBuilder.append("-");
stringBuilder.append(wayLongitude);
stringBuilder.append("\n\n");
txtContinueLocation.setText(stringBuilder.toString());
}
*******************************************************
if (!isContinue && mFusedLocationClient != null) {
mFusedLocationClient.removeLocationUpdates(locationCallback);
}
}
}
}
};
btnLocation.setOnClickListener(v -> {
if (!isGPS) {
Toast.makeText(this, "Please turn on GPS", Toast.LENGTH_SHORT).show();
return;
}
isContinue = false;
getLocation();
});
btnContinueLocation.setOnClickListener(v -> {
if (!isGPS) {
Toast.makeText(this, "Please turn on GPS", Toast.LENGTH_SHORT).show();
return;
}
isContinue = true;
stringBuilder = new StringBuilder();
getLocation();
});
}
private void getLocation() {
if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION},
AppConstants.LOCATION_REQUEST);
} else {
if (isContinue) {
mFusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, null);
} else {
mFusedLocationClient.getLastLocation().addOnSuccessListener(MainActivity.this, location -> {
if (location != null) {
wayLatitude = location.getLatitude();
wayLongitude = location.getLongitude();
txtLocation.setText(String.format(Locale.US, "%s - %s", wayLatitude, wayLongitude));
} else {
mFusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, null);
}
});
}
}
}
@SuppressLint("MissingPermission")
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case 1000: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (isContinue) {
mFusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, null);
} else {
mFusedLocationClient.getLastLocation().addOnSuccessListener(MainActivity.this, location -> {
if (location != null) {
wayLatitude = location.getLatitude();
wayLongitude = location.getLongitude();
txtLocation.setText(String.format(Locale.US, "%s - %s", wayLatitude, wayLongitude));
} else {
mFusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, null);
}
});
}
} else {
Toast.makeText(this, "Permission denied", Toast.LENGTH_SHORT).show();
}
break;
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if (requestCode == AppConstants.GPS_REQUEST) {
isGPS = true; // flag maintain before get location
}
}
}
}
This code now doesn't even display the current latitude and longitude.这段代码现在甚至不显示当前的纬度和经度。 Can someone help me with this.有人可以帮我弄这个吗。 I'm looking to display the State as well as the Lat and Long of the current location.我正在寻找显示 State 以及当前位置的纬度和经度。
The lines of Code where the changes have been implemented and that seems the most relevant to my issue are marked with a long line of asterisk at the Start and End of the code which looks like this: *******************************************************已实施更改并且似乎与我的问题最相关的代码行在代码的开头和结尾处用一长串星号标记，如下所示：********** ************************************************
2 个解决方案
解决方案1
1 已采纳 2019-11-20 07:08:42
All we need to do is add this permission in the manifest file:我们需要做的就是在清单文件中添加这个权限：
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
And create a LocationManager instance like this:并像这样创建一个 LocationManager 实例：
LocationManager locationManager = (LocationManager)
getSystemService(Context.LOCATION_SERVICE);
Check if GPS is enabled or not.
And then implement LocationListener and get coordinates:然后实现 LocationListener 并获取坐标：
LocationListener locationListener = new MyLocationListener();
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, 5000, 10, locationListener);
Here is the sample code to do so
private class MyLocationListener implements LocationListener {私人 class MyLocationListener 实现 LocationListener {
@Override
public void onLocationChanged(Location loc) {
editLocation.setText("");
pb.setVisibility(View.INVISIBLE);
Toast.makeText(
getBaseContext(),
"Location changed: Lat: " + loc.getLatitude() + " Lng: "
+ loc.getLongitude(), Toast.LENGTH_SHORT).show();
String longitude = "Longitude: " + loc.getLongitude();
Log.v(TAG, longitude);
String latitude = "Latitude: " + loc.getLatitude();
Log.v(TAG, latitude);
/*------- To get city name from coordinates -------- */
String cityName = null;
Geocoder gcd = new Geocoder(getBaseContext(), Locale.getDefault());
List<Address> addresses;
try {
addresses = gcd.getFromLocation(loc.getLatitude(),
loc.getLongitude(), 1);
if (addresses.size() > 0) {
System.out.println(addresses.get(0).getLocality());
cityName = addresses.get(0).getLocality();
}
}
catch (IOException e) {
e.printStackTrace();
}
String s = longitude + "\n" + latitude + "\n\nMy Current City is: "
+ cityName;
editLocation.setText(s);
}
@Override
public void onProviderDisabled(String provider) {}
@Override
public void onProviderEnabled(String provider) {}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
}
see this flow: How do I get the current GPS location programmatically in Android?请参阅此流程： 如何在 Android 中以编程方式获取当前 GPS 位置？
解决方案2
0 2019-11-20 06:58:22
Actually this code will not work now.实际上这段代码现在不起作用。 Google has deprecated the above code and now you need to use below code. Google 已弃用上述代码，现在您需要使用以下代码。
I used Retrofit Retrofit Client我用的是 Retrofit Retrofit 客户端
public static final String GOOGLE_ETA = "https://maps.googleapis.com/maps/";
public static Retrofit getEtaClient() {
if (retrofitEtaGoogle == null) {
retrofitEtaGoogle = new Retrofit.Builder()
.baseUrl(GOOGLE_ETA)
.client(provideOkHttpClient())
.addConverterFactory(GsonConverterFactory.create())
.build();
}
return retrofitEtaGoogle;
}
Api interface class Api接口class
@GET("api/geocode/json?key="+ Consts.GOOGLE_API_KEY)
Call<GoogleGeoCodeApiResponseModel> getPlaceFromLatLng(@Query("latlng") String latLng);
In updateLocationUI() method在 updateLocationUI() 方法中
String latLng = location.getLatitude() + "," + location.getLongitude();
ApiInterface apiInterface = RetrofitClient.getEtaClient().create(ApiInterface.class);
Call<GoogleGeoCodeApiResponseModel> call = apiInterface.getPlaceFromLatLng(latLng);
call.enqueue(new Callback<GoogleGeoCodeApiResponseModel>() {
@Override
public void onResponse(Call<GoogleGeoCodeApiResponseModel> call, Response<GoogleGeoCodeApiResponseModel> response) {
if (response.body().getStatus() != null && response.body().getStatus().equals("OK")) {
addressObj = new GoogleAddressLocalModel();
addressObj.setName(response.body().getResults().get(0).getFormattedAddress());
addressObj.setLat(response.body().getResults().get(0).getGeometry().getLocation().getLat());
addressObj.setLng(response.body().getResults().get(0).getGeometry().getLocation().getLng());
for (GoogleGeoCodeApiResponseModel.AddressComponent obj : response.body().getResults().get(0).getAddressComponents()) {
for (String type : obj.getTypes()) {
if (type.contains("postal_code")) {
addressObj.setPostalCode(obj.getLongName());
} else if (type.contains("country")) {
addressObj.setCountryId(obj.getShortName());
addressObj.setCountryName(obj.getLongName());
} else if (type.contains("administrative_area_level_2")) {
addressObj.setCityName(obj.getLongName());
}
}
}
} else if (response.body().getStatus() != null) {
Log.e("ErrroGettingAddress", response.body().getStatus());
}
}
@Override
public void onFailure(Call<GoogleGeoCodeApiResponseModel> call, Throwable t) {
Log.e("ErrroGettingAddress", t.getLocalizedMessage());
}
});
}
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