这是我的 MainActivity 我想检索我设备的最后一个已知位置，我还添加了运行时权限和回调。
package silive.in.weather.Activities;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.Snackbar;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.johnhiott.darkskyandroidlib.ForecastApi;
import com.johnhiott.darkskyandroidlib.RequestBuilder;
import com.johnhiott.darkskyandroidlib.models.Request;
import com.johnhiott.darkskyandroidlib.models.WeatherResponse;
import java.io.IOException;
import java.util.Calendar;
import java.util.List;
import java.util.Locale;
import java.util.Timer;
import java.util.TimerTask;
import retrofit.Callback;
import retrofit.RetrofitError;
import retrofit.client.Response;
import silive.in.weather.Models.GetLocation;
import silive.in.weather.Models.WeatherData;
import silive.in.weather.R;
public class MainActivity extends AppCompatActivity implements View.OnClickListener, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
static double latitude, longitude;
LinearLayout weather_info;
TextView city_text, temp, temp_unit, sky_desc, current_time, date_day, current_time_min, current_time_sec, hourly;
ImageView icon;
ImageButton ref;
TextView humidity, dew, cloud, precip, max_temp, min_temp;
String APIKey = "5b29d34aeee88dc47264e71ed058a592";
//String GeoAPIKey = "AIzaSyAX52peWddi3gJQfuB-5teYPoo5haPb5Iw";
WeatherData weatherData;
GetLocation getLocation;
Context context;
GoogleApiClient mGoogleApiClient;
LocationRequest mLocationRequest;
boolean mRequestingLocationUpdates = true;
LocationListener mLocationListener;
Location mLastLocation;
String mLastUpdateTime;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = getApplicationContext();
//Initializing the layout contents
weather_info = (LinearLayout) findViewById(R.id.weather_info);
current_time = (TextView) findViewById(R.id.current_time);
current_time_min = (TextView) findViewById(R.id.current_time_min);
current_time_sec = (TextView) findViewById(R.id.current_time_sec);
hourly = (TextView) findViewById(R.id.hourly);
date_day = (TextView) findViewById(R.id.date_day);
city_text = (TextView) findViewById(R.id.city_text);
temp = (TextView) findViewById(R.id.temp);
temp_unit = (TextView) findViewById(R.id.temp_unit);
humidity = (TextView) findViewById(R.id.humidity);
dew = (TextView) findViewById(R.id.dew);
precip = (TextView) findViewById(R.id.precip);
cloud = (TextView) findViewById(R.id.cloud);
max_temp = (TextView) findViewById(R.id.max_temp);
min_temp = (TextView) findViewById(R.id.min_temp);
sky_desc = (TextView) findViewById(R.id.sky_desc);
icon = (ImageView) findViewById(R.id.icon);
ref = (ImageButton) findViewById(R.id.ref);
ref.setOnClickListener(this);
//check for connection
checkConnection();
//Google API client
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(context)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
Log.d("TAG", latitude + " " + longitude + "inside onCreate");
if (latitude ==0||longitude ==0){
updateValuesFromBundle(savedInstanceState);
}
weatherData = new WeatherData();
mLocationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
if (Build.VERSION.SDK_INT >= 24 &&
ContextCompat.checkSelfPermission(context, android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(context, android.Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
if (mLastLocation != null) {
latitude = mLastLocation.getLatitude();
longitude = mLastLocation.getLongitude();
Log.d("TAG", latitude + " cal lat");
Log.d("TAG", longitude + " cal lng");
//mLatitudeText.setText(String.valueOf(mLastLocation.getLatitude()));
//mLongitudeText.setText(String.valueOf(mLastLocation.getLongitude()));
}
}
}
};
/*getLocation = new GetLocation(this);
latitude = getLocation.getLatitude();
longitude = getLocation.getLongitude();*/
/*final GPSTracker gpsTracker = new GPSTracker(getApplicationContext());
if (gpsTracker.canGetLocation()) {
latitude = gpsTracker.getLatitude();
longitude = gpsTracker.getLongitude();
Log.d("TAG", latitude + " " + longitude + "inside onCreate");
}*/
ForecastApi.create(APIKey);
RequestBuilder weather = new RequestBuilder();
Request request = new Request();
request.setLat(latitude + "");
request.setLng(longitude + "");
request.setUnits(Request.Units.UK);
request.setLanguage(Request.Language.ENGLISH);
request.addExcludeBlock(Request.Block.CURRENTLY);
request.removeExcludeBlock(Request.Block.CURRENTLY);
weather.getWeather(request, new Callback<WeatherResponse>() {
@Override
public void success(WeatherResponse weatherResponse, Response response) {
Log.d("TAG", "Temp: " + weatherResponse.getCurrently().getTemperature());
Log.d("TAG", "Summary: " + weatherResponse.getCurrently().getSummary());
Log.d("TAG", "Hourly Sum: " + weatherResponse.getHourly().getSummary());
weatherData.setTemperature(weatherResponse.getCurrently().getTemperature());
weatherData.setDesc(weatherResponse.getCurrently().getSummary());
String img = weatherResponse.getCurrently().getIcon();
//icon.setImageResource(Integer.parseInt(img));
//setIcon(img);
//city_text.setText(GetCity(latitude, longitude));
weatherData.setHrs(weatherResponse.getHourly().getSummary());
weatherData.setMydate(java.text.DateFormat.getDateTimeInstance().format(Calendar.getInstance().getTime()));
weatherData.setPres(weatherResponse.getCurrently().getPressure());
weatherData.setPrec(weatherResponse.getCurrently().getPrecipIntensity());
weatherData.setHumid(weatherResponse.getCurrently().getHumidity());
weatherData.setDewp(weatherResponse.getCurrently().getDewPoint());
weatherData.setMax(weatherResponse.getCurrently().getTemperatureMax());
weatherData.setMin(weatherResponse.getCurrently().getTemperatureMin());
}
@Override
public void failure(RetrofitError retrofitError) {
Log.d("TAG", "Error while calling: " + retrofitError.getUrl());
Log.d("TAG", retrofitError.toString());
}
});
temp.setText(" " + weatherData.getTemperature());
temp_unit.setText("C");
sky_desc.setText(weatherData.getDesc());
city_text.setText(GetCity(latitude, longitude));
hourly.setText(weatherData.getHrs());
date_day.setText(weatherData.getMydate());
cloud.setText("Pressure : " + weatherData.getPres());
Log.d("TAG", weatherData.getMax() + " " + weatherData.getMin() + "max min");
Log.d("TAG", weatherData.getPres() + " " + "pressure");
precip.setText("Precipitation : " + weatherData.getPrec());
humidity.setText("Humidity : " + weatherData.getHumid());
dew.setText("Dew Point : " + weatherData.getDewp());
max_temp.setText("Max.T : " + weatherData.getMax());
min_temp.setText("Min.T : " + weatherData.getMin());
updateTimeOnEachSecond();
//new GetData(this).execute();
}
public void checkConnection() {
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = connectivityManager.getActiveNetworkInfo();
if (info == null) {
Snackbar snackbar = Snackbar
.make(weather_info, "No Internet Connection", Snackbar.LENGTH_LONG)
.setAction("RETRY", new View.OnClickListener() {
@Override
public void onClick(View view) {
checkConnection();
}
});
// Changing message text color
snackbar.setActionTextColor(Color.RED);
// Changing action button text color
View sbView = snackbar.getView();
TextView textView = (TextView) sbView.findViewById(android.support.design.R.id.snackbar_text);
textView.setTextColor(Color.YELLOW);
snackbar.show();
} else {
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
/*cornr.setVisibility(View.VISIBLE);
Intent intent = new Intent(Splash.this, MainActivity.class);
startActivity(intent);
finish();*/
}
}, 2000);
}
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.ref:
new GetData(this).execute();
//WeatherUpdate(latitude,longitude);
break;
}
}
@Override
public void onConnected(@Nullable Bundle bundle) {
Log.d("TAG", "Callback called");
if (Build.VERSION.SDK_INT >= 24 &&
ContextCompat.checkSelfPermission(context, android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(context, android.Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
if (mLastLocation != null) {
latitude = mLastLocation.getLatitude();
longitude = mLastLocation.getLongitude();
Log.d("TAG", latitude + " cal lat");
Log.d("TAG", longitude + " cal lng");
//mLatitudeText.setText(String.valueOf(mLastLocation.getLatitude()));
//mLongitudeText.setText(String.valueOf(mLastLocation.getLongitude()));
}
}
if (mRequestingLocationUpdates) {
startLocationUpdates();
}
}
@Override
public void onConnectionSuspended(int i) {
Log.d("TAG", "Connection suspended");
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
Log.d("TAG", "Connection failed");
}
protected void startLocationUpdates() {
if (Build.VERSION.SDK_INT >= 24 &&
ContextCompat.checkSelfPermission(context, android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(context, android.Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
}
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, mLocationListener);
}
public void updateTimeOnEachSecond() {
Timer timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
final Calendar c;
c = Calendar.getInstance();
Log.d("TAG", "time changed");
final int hrs = c.get(Calendar.HOUR_OF_DAY);
final int min = c.get(Calendar.MINUTE);
final int sec = c.get(Calendar.SECOND);
runOnUiThread(new Runnable() {
@Override
public void run() {
current_time.setText(String.valueOf(hrs + " :"));
current_time_min.setText(String.valueOf(min + " :"));
current_time_sec.setText(String.valueOf(sec));
mLastUpdateTime = String.valueOf(hrs+":");
mLastUpdateTime.concat(String.valueOf(min + " :"));
mLastUpdateTime.concat(String.valueOf(sec));
}
});
}
}, 0, 1000);
}
/*public void setIcon(String str) {
//icon = (ImageView) findViewById(R.id.icon);
*//*if (str.contains("sun") && str.contains("clear")) {
icon.setImageResource(R.mipmap.sunny);
} else if (str.contains("night") && str.contains("clear")) {
icon.setImageResource(R.mipmap.clrnt);
} else if (str.contains("night") && str.contains("cloud")) {
icon.setImageResource(R.mipmap.cldnt);
} else if (str.contains("night") && str.contains("rain")) {
icon.setImageResource(R.mipmap.ntrain);
} else if (str.contains("sun") && str.contains("rain")) {
icon.setImageResource(R.mipmap.sunrain);
} else if (str.contains("night") && str.contains("thunder")) {
icon.setImageResource(R.mipmap.thndr);
} else if (str.contains("rain") && str.contains("thunder")) {
icon.setImageResource(R.mipmap.thndr);
} else if (str.contains("day") && str.contains("rain")) {
icon.setImageResource(R.mipmap.rain);
} else if (str.contains("day") && str.contains("cloudy")) {
icon.setImageResource(R.mipmap.prtcld);
}*//*
}*/
public String GetCity(double latitude, double longitude) {
Log.d("TAG", latitude + " " + longitude + "one");
/*if (latitude == 0 || longitude == 0) {
latitude = getLocation.getLatitude();
longitude = getLocation.getLongitude();
}*/
Geocoder geoCoder = new Geocoder(getApplicationContext(), Locale.getDefault());
StringBuilder builder = new StringBuilder();
try {
List<Address> address = geoCoder.getFromLocation(latitude, longitude, 1);
Log.d("TAG", latitude + " " + longitude);
int maxLines = address.get(0).getMaxAddressLineIndex();
//int maxLines = 2;
for (int i = 0; i < maxLines; i++) {
Log.d("TAG", maxLines + " ");
String addressStr = address.get(0).getAddressLine(i);
Log.d("TAG", maxLines + " ");
if ((i >= 1) && (i <= (maxLines - 1))) {
builder.append(addressStr);
builder.append(" ");
}
}
String finalAddress = builder.toString(); //This is the complete address.
return finalAddress;
} catch (IOException e) {
// Handle IOException
} catch (NullPointerException e) {
// Handle NullPointerException
}
return null;
}
public void onSaveInstanceState(Bundle savedInstanceState) {
savedInstanceState.putBoolean("REQUESTING_LOCATION_UPDATES_KEY",
mRequestingLocationUpdates);
savedInstanceState.putParcelable("LOCATION_KEY", mLastLocation);
savedInstanceState.putString("LAST_UPDATED_TIME_STRING_KEY", mLastUpdateTime);
super.onSaveInstanceState(savedInstanceState);
}
private void updateValuesFromBundle(Bundle savedInstanceState) {
if (savedInstanceState != null) {
if (savedInstanceState.keySet().contains("REQUESTING_LOCATION_UPDATES_KEY")) {
mRequestingLocationUpdates = savedInstanceState.getBoolean(
"REQUESTING_LOCATION_UPDATES_KEY");
//setButtonsEnabledState();
}
if (savedInstanceState.keySet().contains("LOCATION_KEY")) {
mLastLocation = savedInstanceState.getParcelable("LOCATION_KEY");
}
if (savedInstanceState.keySet().contains("LAST_UPDATED_TIME_STRING_KEY")) {
mLastUpdateTime = savedInstanceState.getString(
"LAST_UPDATED_TIME_STRING_KEY");
updateTimeOnEachSecond();
}
}
}
//Class to get API data
public class GetData extends AsyncTask<Void, Void, String> {
ProgressDialog progressDialog;
private double lat, lng;
public GetData(Context c) {
this.progressDialog = new ProgressDialog(c);
this.lat = getLocation.getLatitude();
this.lng = getLocation.getLongitude();
Log.d("TAG", lat + " " + lng + " inside GetData");
/*final GPSTracker gpsTracker = new GPSTracker(getApplicationContext());
if (gpsTracker.canGetLocation()) {
this.lat = gpsTracker.getLatitude();
this.lng = gpsTracker.getLongitude();
} else {
Log.d("TAG", " no gps");
DialogGps dialogGps = new DialogGps();
dialogGps.show(getFragmentManager(), "GPS Alert");
//gpsTracker.showSettingsAlert();
}*/
Log.d("TAG", lat + " " + lng + "inside getData");
}
public void UpdateUI(WeatherData getData) {
temp.setText(" " + getData.getTemperature());
temp_unit.setText("C");
sky_desc.setText(getData.getDesc());
city_text.setText(GetCity(lat, lng));
hourly.setText(getData.getHrs());
date_day.setText(getData.getMydate());
cloud.setText("Pressure : " + getData.getPres());
Log.d("TAG", getData.getMax() + " " + getData.getMin() + "max min");
Log.d("TAG", getData.getPres() + " " + "pressure");
precip.setText("Precipitation : " + getData.getPrec());
humidity.setText("Humidity : " + getData.getHumid());
dew.setText("Dew Point : " + getData.getDewp());
max_temp.setText("Max.T : " + getData.getMax());
min_temp.setText("Min.T : " + getData.getMin());
updateTimeOnEachSecond();
}
@Override
protected void onPreExecute() {
super.onPreExecute();
//progressDialog = new ProgressDialog(getApplicationContext());
progressDialog.setMessage("Loading");
progressDialog.show();
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
progressDialog.dismiss();
}
@Override
protected String doInBackground(Void... params) {
Log.d("TAG", lat + "" + lng);
RequestBuilder weather = new RequestBuilder();
Request request = new Request();
request.setLat(lat + "");
request.setLng(lng + "");
request.setUnits(Request.Units.UK);
request.setLanguage(Request.Language.ENGLISH);
request.addExcludeBlock(Request.Block.CURRENTLY);
request.removeExcludeBlock(Request.Block.CURRENTLY);
weather.getWeather(request, new Callback<WeatherResponse>() {
@Override
public void success(WeatherResponse weatherResponse, Response response) {
Log.d("TAG", "Temp: " + weatherResponse.getCurrently().getTemperature());
Log.d("TAG", "Summary: " + weatherResponse.getCurrently().getSummary());
Log.d("TAG", "Hourly Sum: " + weatherResponse.getHourly().getSummary());
weatherData.setTemperature(weatherResponse.getCurrently().getTemperature());
weatherData.setDesc(weatherResponse.getCurrently().getSummary());
String img = weatherResponse.getCurrently().getIcon();
//icon.setImageResource(Integer.parseInt(img));
//setIcon(img);
weatherData.setHrs(weatherResponse.getHourly().getSummary());
weatherData.setMydate(java.text.DateFormat.getDateTimeInstance().format(Calendar.getInstance().getTime()));
weatherData.setPres(weatherResponse.getCurrently().getPressure());
weatherData.setPrec(weatherResponse.getCurrently().getPrecipIntensity());
weatherData.setHumid(weatherResponse.getCurrently().getHumidity());
weatherData.setDewp(weatherResponse.getCurrently().getDewPoint());
weatherData.setMax(weatherResponse.getCurrently().getTemperatureMax());
weatherData.setMin(weatherResponse.getCurrently().getTemperatureMin());
UpdateUI(weatherData);
}
@Override
public void failure(RetrofitError retrofitError) {
Log.d("TAG", "Error while calling: " + retrofitError.getUrl());
Log.d("TAG", retrofitError.toString());
}
});
return null;
}
}
}
logcat 显示所有位置的 0.0 ,0.0，甚至没有显示对 onConnected() 的调用。