使用lastKnownLocation时，纬度和经度始终返回0.0

时间：2016-11-01 21:43:25

标签： java android google-api android-gps runtime-permissions

我刚刚获得了通过库处理的权限让我，但我仍然无法在我的Android应用程序中获得经度和纬度。我正在使用名为GPS_Service.java的服务。另外，我并非100％确定我的权限不是问题。 GPS_Service中对谷歌API的调用仍然带有下划线，警告它需要可能被拒绝的权限。即使第三方图书馆，这应该会消失吗？这仍然是一个问题，因为在我的设备上，应用程序启用了位置权限吗？

这是我的主要活动：

package com.example.paxie.stormy.ui;

import android.Manifest;
import android.annotation.TargetApi;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.canelmas.let.AskPermission;
import com.canelmas.let.DeniedPermission;
import com.canelmas.let.Let;
import com.canelmas.let.RuntimePermissionListener;
import com.canelmas.let.RuntimePermissionRequest;
import com.example.paxie.stormy.GPS_Service;
import com.example.paxie.stormy.R;
import com.example.paxie.stormy.weather.Current;
import com.example.paxie.stormy.weather.Day;
import com.example.paxie.stormy.weather.Forecast;
import com.example.paxie.stormy.weather.Hour;
import com.google.android.gms.maps.model.LatLng;
import com.squareup.okhttp.Call;
import com.squareup.okhttp.Callback;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;

public class MainActivity extends AppCompatActivity implements RuntimePermissionListener {

    public static final String TAG = MainActivity.class.getSimpleName();
    public static final String DAILY_FORECAST = "DAILY_FORECAST";
    public static final String HOURLY_FORECAST = "HOURLY_FORECAST";
    private Forecast mForecast;
    private double mLatitude;
    private double mLongitude;
    private BroadcastReceiver broadcastReceiver;
    private Location location; // location
    private double latitude; // latitude
    private double longitude; // longitude
    private Context mContext;

    @BindView(R.id.timeLabel)
    TextView mTimeLabel;
    @BindView(R.id.temperatureLabel)
    TextView mTemperatureLabel;
    @BindView(R.id.humidityValue)
    TextView mHumidityValue;
    @BindView(R.id.precipValue)
    TextView mPrecipValue;
    @BindView(R.id.summaryLabel)
    TextView mSummaryLabel;
    @BindView(R.id.iconImageView)
    ImageView mIconImageView;
    @BindView(R.id.refreshImageView)
    ImageView mRefreshImageView;
    @BindView(R.id.progressBar)
    ProgressBar mProgressBar;
    @BindView(R.id.locationLabel)
    TextView mLocationlabel;

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        Let.handle(this, requestCode, permissions, grantResults);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);


        mProgressBar.setVisibility(View.INVISIBLE);

        mRefreshImageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getForecast();
            }
        });


        getForecast();
        Log.d(TAG, "Main UI code is running!");
    }

    private void getForecast() {
        checkGPS();
        String apiKey = "1621390f8c36997cb1904914b726df52";
        String forecastUrl = "https://api.forecast.io/forecast/" + apiKey +
                "/" + mLatitude + "," + mLongitude;

        if (isNetworkAvailable()) {
            toggleRefresh();

            OkHttpClient client = new OkHttpClient();
            Request request = new Request.Builder()
                    .url(forecastUrl)
                    .build();

            Call call = client.newCall(request);
            call.enqueue(new Callback() {
                @Override
                public void onFailure(Request request, IOException e) {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            toggleRefresh();
                        }
                    });
                    alertUserAboutError();
                }

                @Override
                public void onResponse(Response response) throws IOException {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            toggleRefresh();
                        }
                    });
                    try {
                        String jsonData = response.body().string();
                        Log.v(TAG, jsonData);
                        if (response.isSuccessful()) {
                            mForecast = parseForecastDetails(jsonData);
                            runOnUiThread(new Runnable() {
                                @Override
                                public void run() {
                                    updateDisplay();
                                }
                            });

                        } else {
                            alertUserAboutError();

                        }
                    } catch (IOException e)

                    {
                        Log.e(TAG, "Exception caught: ", e);
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            });
        } else {
            Toast.makeText(this, "Network is currently unavailable!", Toast.LENGTH_LONG).show();
        }
    }


    private void toggleRefresh() {
        if (mProgressBar.getVisibility() == View.INVISIBLE) {
            mProgressBar.setVisibility(View.VISIBLE);
            mRefreshImageView.setVisibility(View.INVISIBLE);
        } else {
            mProgressBar.setVisibility(View.INVISIBLE);
            mRefreshImageView.setVisibility(View.VISIBLE);
        }
    }

    private void updateDisplay() {
        mLocationlabel.setText(mLatitude + " " + mLongitude);
        Current current = mForecast.getCurrent();
        mTemperatureLabel.setText(current.getTemperature() + "");
        mTimeLabel.setText("At " + current.getFormattedTime() + " it will be:");
        mHumidityValue.setText(current.getHumidity() + "");
        mPrecipValue.setText(current.getPrecipChance() + "%");
        mSummaryLabel.setText(current.getSummary());
        Drawable drawable = ContextCompat.getDrawable(this, current.getIconId());
        mIconImageView.setImageDrawable(drawable);
    }

    private Forecast parseForecastDetails(String jsonData) throws JSONException {
        Forecast forecast = new Forecast();
        forecast.setCurrent(getCurrentDetails(jsonData));
        forecast.setHourlyForecast(getHourlyForecast(jsonData));
        forecast.setDailyForecast(getDailyForecast(jsonData));

        return forecast;

    }

    private Day[] getDailyForecast(String jsonData) throws JSONException {
        JSONObject forecast = new JSONObject(jsonData);
        String timezone = forecast.getString("timezone");
        JSONObject daily = forecast.getJSONObject("daily");
        JSONArray data = daily.getJSONArray("data");

        Day[] days = new Day[data.length()];

        for (int i = 0; i < data.length(); i++) {
            JSONObject jsonDay = data.getJSONObject(i);
            Day day = new Day();

            day.setSummary(jsonDay.getString("summary"));
            day.setIcon(jsonDay.getString("icon"));
            day.setTemperatureMax(jsonDay.getDouble("temperatureMax"));
            day.setTime(jsonDay.getLong("time"));
            day.setTimeZone(timezone);

            days[i] = day;

        }
        return days;
    }

    private Hour[] getHourlyForecast(String jsonData) throws JSONException {
        JSONObject forecast = new JSONObject(jsonData);
        String timezone = forecast.getString("timezone");
        JSONObject hourly = forecast.getJSONObject("hourly");
        JSONArray data = hourly.getJSONArray("data");

        Hour[] hours = new Hour[data.length()];

        for (int i = 0; i < data.length(); i++) {
            JSONObject jsonHour = data.getJSONObject(i);
            Hour hour = new Hour();
            hour.setSummary(jsonHour.getString("summary"));
            hour.setTemperature(jsonHour.getDouble("temperature"));
            hour.setIcon(jsonHour.getString("icon"));
            hour.setTime(jsonHour.getLong("time"));
            hour.setTimeZone(timezone);

            hours[i] = hour;

        }
        return hours;
    }

    private Current getCurrentDetails(String jsonData) throws JSONException {
        JSONObject forecast = new JSONObject(jsonData);
        String timezone = forecast.getString("timezone");
        Log.i(TAG, "From JSON:  " + timezone);

        JSONObject currently = forecast.getJSONObject("currently");
        Current current = new Current();
        current.setHumidity(currently.getDouble("humidity"));
        current.setTime(currently.getLong("time"));
        current.setIcon(currently.getString("icon"));
        current.setPrecipChance(currently.getDouble("precipProbability"));
        current.setSummary(currently.getString("summary"));
        current.setTemperature(currently.getDouble("temperature"));
        current.setTimeZone(timezone);

        Log.d(TAG, current.getFormattedTime());

        return current;
    }

    private boolean isNetworkAvailable() {
        ConnectivityManager manager = (ConnectivityManager)
                getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = manager.getActiveNetworkInfo();
        boolean isAvailable = false;
        if (networkInfo != null && networkInfo.isConnected()) {
            isAvailable = true;
        }
        return isAvailable;
    }


    private void alertUserAboutError() {
        AlertDialogFragment dialog = new AlertDialogFragment();
        dialog.show(getFragmentManager(), "error_dialog");
    }


    @OnClick(R.id.dailyButton)
    public void startDailyActivity(View view) {
        Intent intent = new Intent(this, DailyForecastActivity.class);
        intent.putExtra(DAILY_FORECAST, mForecast.getDailyForecast());
        startActivity(intent);

    }

    @OnClick(R.id.hourlyButton)
    public void startHourlyActivity(View view) {
        Intent intent = new Intent(this, HourlyForecastActivity.class);
        intent.putExtra(HOURLY_FORECAST, mForecast.getHourlyForecast());
        startActivity(intent);
    }
@AskPermission({Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION})
    private void checkGPS() {
        GPS_Service gps_service = new GPS_Service(this);
        gps_service.getLocation();
        mLatitude = gps_service.getLatitude();
        mLongitude = gps_service.getLongitude();
    }

    @Override
    public void onShowPermissionRationale(List<String> permissionList, RuntimePermissionRequest permissionRequest) {

    }

    @Override
    public void onPermissionDenied(List<DeniedPermission> deniedPermissionList) {
    }
}

这是我的GPS_Service.java：

package com.example.paxie.stormy;

import android.*;
import android.Manifest;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
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.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

import com.canelmas.let.AskPermission;
import com.canelmas.let.DeniedPermission;
import com.canelmas.let.Let;
import com.canelmas.let.RuntimePermissionListener;
import com.canelmas.let.RuntimePermissionRequest;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationServices;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by paxie on 10/27/16.
 */

public class GPS_Service extends Service implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {

    private Location location; // location
    private double latitude; // latitude
    private double longitude; // longitude
    private GoogleApiClient mGAC;
    private Context mContext;
    public static final String TAG = "GPSresource";
    private static final int RC_GPS_PERMS = 124;
    public String[] perm = {Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION};

    public GPS_Service(Context c) {
        mContext = c;
        try {
            buildGoogleApiClient();
            mGAC.connect();
        } catch (Exception e) {
            Log.d(TAG, e.toString());
        }
    }



    protected synchronized void buildGoogleApiClient() {
        mGAC = new GoogleApiClient.Builder(mContext)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
    }


    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;
    }

    @Override
    public void onConnected(Bundle bundle) {

    }


    @Override
    public void onConnectionSuspended(int i) {

    }


    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {

    }

    public void getLocation() {
        location = LocationServices.FusedLocationApi.getLastLocation(mGAC);
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

2 个答案:

答案 0 :(得分：0)

在这种情况下，启用你的GPS并转到谷歌地图并点击位置按钮，等到谷歌地图找到你，然后回去测试你的应用程序。这应该有效，因为如果你第一次使用手机而你从未被连接到GPS那么它会给你带来这个问题

答案 1 :(得分：0)

它正在寻找具体的“LastKnownLocation”，我也有这个问题。移动约3米再试一次。如果没有“最后已知位置”，则它发送空值。

我所做的是为我的应用程序设置了一些if语句。如果GPS提供商正在吐出空值，那么使用网络提供商位置坐标，如果那是吐出空值，那么我只是显示一条消息“等待”或“稍后再试”。最终，您的GPS提供商会在激活一段时间后获取位置值。 

     newLoc = _locationManager.GetLastKnownLocation(_locationProvider);
        if (newLoc != null)
        {
            _latitudeUser = newLoc.Latitude;
            _longitudeUser = newLoc.Longitude;
            _locationText.Text = string.Format("{0:f6},{1:f6}", newLoc.Latitude, newLoc.Longitude);
        }
        else
        {
            _locationProvider = LocationManager.NetworkProvider;
            newLoc = _locationManager.GetLastKnownLocation(_locationProvider);
            if (newLoc != null)
            {
                _latitudeUser = newLoc.Latitude;
                _longitudeUser = newLoc.Longitude;
                _locationText.Text = string.Format("{0:f6},{1:f6}", newLoc.Latitude, newLoc.Longitude);
            }
            else
            {
                _locationText.Text = string.Format("We currently cannot determine your location, please try again later.");
            }
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