我正在尝试将 GPS 功能添加到我的 android 应用程序中，gps 坐标每次都会出现 0.0、0.0
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【中文标题】我正在尝试将 GPS 功能添加到我的 android 应用程序中，gps 坐标每次都会出现 0.0、0.0【英文标题】：I'm trying to add GPS functionality to my android app, gps coordinates come out to 0.0, 0.0 every time 【发布时间】：2017-03-10 00:01:42 【问题描述】：我想在应用程序启动和点击刷新按钮时检查 GPS，并使用这些数据点以 mLatitude 和 mLongitude 的形式调用天气 api。最终我将对城市进行地理编码，但现在出于调试目的，我将 GPS 坐标输出到 locationLabel 文本视图。
我的 MainActivity.java：
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.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.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 butterknife.Bind;
import butterknife.ButterKnife;
import butterknife.OnClick;
public class MainActivity extends AppCompatActivity
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;
@Bind(R.id.timeLabel)
TextView mTimeLabel;
@Bind(R.id.temperatureLabel)
TextView mTemperatureLabel;
@Bind(R.id.humidityValue)
TextView mHumidityValue;
@Bind(R.id.precipValue)
TextView mPrecipValue;
@Bind(R.id.summaryLabel)
TextView mSummaryLabel;
@Bind(R.id.iconImageView)
ImageView mIconImageView;
@Bind(R.id.refreshImageView)
ImageView mRefreshImageView;
@Bind(R.id.progressBar)
ProgressBar mProgressBar;
@Bind(R.id.locationLabel)
TextView mLocationlabel;
@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()
if(!runtime_permissions())
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);
private void checkGPS()
if (broadcastReceiver == null)
broadcastReceiver = new BroadcastReceiver()
@Override
public void onReceive(Context context, Intent intent)
mLatitude = (double) intent.getExtras().get("latitude");
mLongitude = (double) intent.getExtras().get("longitude");
;
registerReceiver(broadcastReceiver, new IntentFilter("location_update"));
private boolean runtime_permissions()
if (Build.VERSION.SDK_INT >= 23 && ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
requestPermissions(new String[]Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION, 100);
return true;
return false;
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults)
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 100)
if (grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED)
getForecast();
else
runtime_permissions();
@Override
protected void onResume()
super.onResume();
checkGPS();
我的 GPSservice.java：
package com.example.paxie.stormy;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
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.Nullable;
/**
* Created by paxie on 10/27/16.
*/
public class GPS_Service extends Service
private LocationListener listener;
private LocationManager locationManager;
@Nullable
@Override
public IBinder onBind(Intent intent)
return null;
@Override
public void onCreate()
listener = new LocationListener()
@Override
public void onLocationChanged(Location location)
Intent i = new Intent("location_update");
i.putExtra("coordinates",location.getLongitude()+" "+location.getLatitude());
i.putExtra("longitude", location.getLongitude());
i.putExtra("latitude", location.getLatitude());
sendBroadcast(i);
@Override
public void onStatusChanged(String s, int i, Bundle bundle)
@Override
public void onProviderEnabled(String s)
@Override
public void onProviderDisabled(String s)
Intent i = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
;
locationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
//noinspection MissingPermission
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,3000,0,listener);
@Override
public void onDestroy()
super.onDestroy();
if(locationManager != null)
//noinspection MissingPermission
locationManager.removeUpdates(listener);
【问题讨论】：
你看到我的回答了吗？你在哪里接触到这个？ 【参考方案1】：您可以尝试以下两件事：
1. 请确保您已在清单中包含ACCESS_FINE_LOCATION 和ACCESS_COARSE_LOCATION 权限。如果您的应用面向 Android API 23 及更高版本，则需要包含运行时权限处理。
2.不应将LocationListener 对象作为类成员，而应将Service 实现为接口并实现其onLocationChanged() 方法。
除此之外，您确实应该考虑使用 Google Play 服务中的位置 API，而不是 AOSP 中的那些（即android.location）。
见Making Your App Location-Aware
【讨论】：
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