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java - 在 Android M 中获取经纬度 0.0

转载 作者:塔克拉玛干 更新时间:2023-11-02 23:36:46 25 4
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我遇到了在 Android Marshmallow (API 23) 即 6.0 中获取值 0.0 作为纬度和经度的问题。

我已经搜索了很多相关内容,但没有找到解决方案。我的代码完全适用于低于 23 的其他 API 版本。

我还放置了 selfPermission 的代码,它们都在工作,而不是它给我 0.0 作为迟到和长。

请看一下我正在走的路:

GPSTracker.java

public class GPSTracker extends Service implements LocationListener {

private Context mContext;

// Flag for GPS status
boolean isGPSEnabled = false;

// Flag for network status
boolean isNetworkEnabled = false;

// Flag for GPS status
boolean canGetLocation = false;

Location location; // Location
double latitude; // Latitude
double longitude; // Longitude

// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 1000;

// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

// Declaring a Location Manager
protected LocationManager locationManager;

Activity activity;

public GPSTracker() {
}

public GPSTracker(Context context, Activity activity) {
this.mContext = context;
this.activity = activity;
getLocation();
}

public Location getLocation() {
try {


locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);

// Getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);

// Getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

if (!isGPSEnabled && !isNetworkEnabled) {
// No network provider is enabled
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
int requestPermissionsCode = 50;
if (ContextCompat.checkSelfPermission(activity, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(activity, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, requestPermissionsCode);

} else {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
// If GPS enabled, get latitude/longitude using GPS Services
if (isGPSEnabled) {
if (location == null) {
if (ContextCompat.checkSelfPermission(activity, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(activity, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 50);

} else {
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);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}

return location;
}


/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app.
* */
public void stopUsingGPS() {
if (locationManager != null) {
if (ContextCompat.checkSelfPermission(activity, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(activity, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 50);

} else {
locationManager.removeUpdates(GPSTracker.this);
}


}
}


/**
* Function to get latitude
* */
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;
}

/**
* Function to check GPS/Wi-Fi enabled
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}


/**
* Function to show settings alert dialog.
* On pressing the Settings button it will launch Settings Options.
* */
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

// Setting Dialog Title
alertDialog.setTitle("GPS is settings");

// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

// On pressing the Settings button.
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});

// On pressing the cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});

// Showing Alert Message
alertDialog.show();
}


@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 arg0) {
return null;
}
}

DashboardActivity.java:

在 onCreate() 中我已经初始化了 GPSTracker:

gps = new GPSTracker(mContext,DashboardActivity.this);

// Check if GPS enabled
if(gps.canGetLocation()) {

double latitude = gps.getLatitude();
double longitude = gps.getLongitude();

// \n is for new line
Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
} else {
// Can't get location.
// GPS or network is not enabled.
// Ask user to enable GPS/network in settings.
gps.showSettingsAlert();
}

AndroidManifest.xml

<permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<permission android:name="android.permission.ACCESS_FINE_LOCATION" />


<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />

我浏览了 Stack Overflow 中提供的许多链接,但没有一个帮助我解决了这个问题。

在这里,我将不胜感激。

最佳答案

CommonsWareBlackkara 答案的帮助下,我能够解决我的问题。

根据他们的建议,我更改了我的代码,并通过调试检查我的代码的每一步。

因此,我遇到了一个问题,即我的 onLocationChanged() 在 Marshmallow 的情况下没有被触发,但令人惊讶的是,它在低于 Android M 或 6.0 的旧设备上被触发。

为了解决这个问题,我更改了我的代码如下,在这里我发布了完整的代码,以便遇到同样问题的任何人都可以摆脱它。

GPSTracker.java

public class GPSTracker extends Service{

private Context mContext;

// Flag for GPS status
boolean isGPSEnabled = false;

// Flag for network status
boolean isNetworkEnabled = false;

// Flag for GPS status
boolean canGetLocation = false;

Location location; // Location
double latitude; // Latitude
double longitude; // Longitude

// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 1000; // 10 meters

// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

// Declaring a Location Manager
protected LocationManager locationManager;

Activity activity;

public GPSTracker() {
}

public GPSTracker(Context context, Activity activity) {
this.mContext = context;
this.activity = activity;
getLocation();
}

public Location getLocation() {
try {


locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);

// Getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);

// Getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

if (!isGPSEnabled && !isNetworkEnabled) {
// No network provider is enabled
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
int requestPermissionsCode = 50;

locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, mLocationListener);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
// If GPS enabled, get latitude/longitude using GPS Services
if (isGPSEnabled) {
if (location == null) {
if (ContextCompat.checkSelfPermission(activity, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(activity, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 50);

} else {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, mLocationListener);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {

location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}

}
} catch (Exception e) {
e.printStackTrace();
}

return location;
}


/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app.
* */
public void stopUsingGPS() {

}


private final LocationListener mLocationListener = new LocationListener() {
@Override
public void onLocationChanged(final Location location) {

if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {

}

@Override
public void onProviderEnabled(String provider) {

}

@Override
public void onProviderDisabled(String provider) {

}
};

/**
* Function to get latitude
* */
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;
}

/**
* Function to check GPS/Wi-Fi enabled
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}


/**
* Function to show settings alert dialog.
* On pressing the Settings button it will launch Settings Options.
* */
public void showSettingsAlert() {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

// Setting Dialog Title
alertDialog.setTitle("GPS is settings");

// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

// On pressing the Settings button.
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});

// On pressing the cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});

// Showing Alert Message
alertDialog.show();
}


@Override
public IBinder onBind(Intent arg0) {
return null;
}
}

DashboardActivity.java

public class DashboardActivity extends Activity {      

Context mContext;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dashboard);

mContext = this;

if (ContextCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(DashboardActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);

} else {
Toast.makeText(mContext,"You need have granted permission",Toast.LENGTH_SHORT).show();
gps = new GPSTracker(mContext, DashboardActivity.this);

// Check if GPS enabled
if (gps.canGetLocation()) {

double latitude = gps.getLatitude();
double longitude = gps.getLongitude();

// \n is for new line
Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
} else {
// Can't get location.
// GPS or network is not enabled.
// Ask user to enable GPS/network in settings.
gps.showSettingsAlert();
}
}
}


@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);

switch (requestCode) {
case 1: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {

// permission was granted, yay! Do the

// contacts-related task you need to do.

gps = new GPSTracker(mContext, DashboardActivity.this);

// Check if GPS enabled
if (gps.canGetLocation()) {

double latitude = gps.getLatitude();
double longitude = gps.getLongitude();

// \n is for new line
Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
} else {
// Can't get location.
// GPS or network is not enabled.
// Ask user to enable GPS/network in settings.
gps.showSettingsAlert();
}

} else {

// permission denied, boo! Disable the
// functionality that depends on this permission.

Toast.makeText(mContext, "You need to grant permission", Toast.LENGTH_SHORT).show();
}
return;
}
}
}
}

list 文件:

添加的权限

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />

在应用标签中声明服务:

 <service android:name=".utilities.GPSTracker"/>

关于java - 在 Android M 中获取经纬度 0.0,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36915290/

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