我正在尝试开发一个Android应用程序，它将获取当前位置并将其发送到服务器。当我用模拟器进行测试时，它总是显示纬度和长度为＆＃39; 0＆＃39; 0并且在手机上进行测试时，我正在获取设置警告框以始终打开GPS，即使它是“开启”。以下是我试过的代码..
public class Sample extends Activity {
GPSTracker gps;
EditText editTextAddress, editTextPort;
Button buttonConnect;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sample);
editTextAddress = (EditText)findViewById(R.id.address);
editTextPort = (EditText)findViewById(R.id.port);
buttonConnect = (Button)findViewById(R.id.connect);
buttonConnect.setOnClickListener(new View.OnClickListener() {
double latitude;
double longitude;
@Override
public void onClick(View v) {
gps = new GPSTracker(Sample.this);
if(gps.canGetLocation()) {
latitude = gps.getLatitude();
longitude = gps.getLongitude();
Toast.makeText(
getApplicationContext(),
"Your Location is -\nLatitude: " + latitude + "\nLongitude: "
+ longitude + "\nLocation Sent", Toast.LENGTH_LONG).show();
} else {
gps.showSettingsAlert();
}
MyClientTask myClientTask = new MyClientTask(
editTextAddress.getText().toString(),
Integer.parseInt(editTextPort.getText().toString()),latitude, longitude);
myClientTask.execute();
}
});
}
public class MyClientTask extends AsyncTask<Void, Void, Void> {
String dstAddress;
int dstPort;
double latitude;
double longitude;
MyClientTask(String addr, int port, double lat, double lon){
dstAddress = addr;
dstPort = port;
latitude = lat;
longitude = lon;
}
@Override
protected Void doInBackground(Void... arg0) {
Socket socket = null;
String lat1 = String.valueOf(latitude);
String lon1 = String.valueOf(longitude);
String msg = lat1 + lon1;
try {
socket = new Socket(dstAddress, dstPort);
OutputStream outputStream;
outputStream = socket.getOutputStream();
PrintStream printStream = new PrintStream(outputStream);
printStream.print(msg);
printStream.close();
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(socket != null){
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return null;
}
}
}
我的GPS追踪器代码如下
public class GPSTracker extends Service implements LocationListener{
private final Context context;
boolean isGPSEnabled = false;
boolean isNetworkEnabled = false;
boolean canGetLocation = false;
Location location;
double latitude;
double longitude;
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 5;
private static final long MIN_TIME_BW_UPDATES = 1000 * 35 * 1;
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.context = context;
getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager) context.getSystemService(LOCATION_SERVICE);
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if(!isGPSEnabled && !isNetworkEnabled) {
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
if(isGPSEnabled) {
if(location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
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;
}
public void stopUsingGPS() {
if(locationManager != null) {
locationManager.removeUpdates(GPSTracker.this);
}
}
public double getLatitude() {
if(location != null) {
latitude = location.getLatitude();
}
return latitude;
}
public double getLongitude() {
if(location != null) {
longitude = location.getLongitude();
}
return longitude;
}
public boolean canGetLocation() {
return this.canGetLocation;
}
public void showSettingsAlert() {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(context);
alertDialog.setTitle("GPS is settings");
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
context.startActivity(intent);
}
});
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alertDialog.show();
}
@Override
public void onLocationChanged(Location arg0) {
// TODO Auto-generated method stub
}
@Override
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
请有人帮我确定问题。谢谢。
答案 0 :(得分：0)
在onClick操作中检查this.canGetLocation = true;之前，您是否确定在{get}位置函数调用if(gps.canGetLocation()) {。你可以在this.canGetLocation = true;上做一个断点并调试，看看先调用什么，然后调用什么。