当我调试此代码时发现我的位置管理器和位置提供程序都有值但在onLocationChanged（位置位置）方法中没有获取位置值，那么我该如何解决这个问题。
public class MainActivity extends ActionBarActivity implements LocationListener
{
EditText editText;
Button button;
Context context;
LocationManager locationManager;
private Location location12;
double longitude=0,latitude=0;
boolean gpsStatus=false,NetworkStatus=false,PassiveProvider=false;
private final long time=1000*10;//every 10 seconds
private final float distance =5;//every 5 meter
String Provider=null;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addListenerAction();
}
public void addListenerAction()
{
editText=(EditText) findViewById(R.id.editText1);
button=(Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v)
{
context=getApplicationContext();
getLocation();
}
});
}
public void getLocation()
{
locationManager=(LocationManager) getSystemService(Context.LOCATION_SERVICE);
gpsStatus=locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if(gpsStatus)
{
Log.v("Gps is On","="+gpsStatus);
Criteria criteria=new Criteria();
Provider=locationManager.getBestProvider(criteria, true);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0, 0,this);
}
}
@Override
public void onLocationChanged(Location location)
{
location12=location;
if(locationManager !=null && Provider !=null && location12 !=null)
{
Location s=location;
// here i did not value. how may i resolve it.
location=locationManager.getLastKnownLocation(Provider);
if(s !=null)
{
latitude=location.getLatitude();
longitude=location.getLongitude();
System.out.println("lATITUDE ="+latitude + "Longitude ="+longitude);
}
}
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
我使用了这些权限。
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INSTALL_LOCATION_PROVIDER"/>
但我没有成功获得位置价值。
答案 0 :(得分：0)
获得确切位置非常困难。如果您使用以下代码，那么您将获得精确位置。
需要做的事：
您需要拥有Google playservice Lib项目，该项目将在sdk示例中提供。
复制粘贴此类。
public class Ex extends Activity实现了LocationListener，GooglePlayServicesClient.ConnectionCallbacks， GooglePlayServicesClient.OnConnectionFailedListener {
private Location location;
private LocationRequest mLocationRequest;
private LocationClient mLocationClient;
private int UPDATE_INTERVAL_IN_MILLISECONDS = 0;
private int FAST_INTERVAL_CEILING_IN_MILLISECONDS = 0;
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 20000;
@Override
protected void onCreate(Bundle arg0) {
super.onCreate(arg0);
setContentView(R.layout.sample);
mLocationRequest = LocationRequest.create();
mLocationRequest.setInterval(UPDATE_INTERVAL_IN_MILLISECONDS);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setFastestInterval(FAST_INTERVAL_CEILING_IN_MILLISECONDS);
mLocationClient = new LocationClient(this, this, this);
mLocationClient.connect();
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
/*
* Google Play services can resolve some errors it detects. If the error
* has a resolution, try sending an Intent to start a Google Play
* services activity that can resolve error.
*/
if (connectionResult.hasResolution()) {
try {
// Start an Activity that tries to resolve the error
connectionResult.startResolutionForResult( this,CONNECTION_FAILURE_RESOLUTION_REQUEST);
} catch (IntentSender.SendIntentException e) {
// Log the error
e.printStackTrace();
}
} else {
// If no resolution is available, display a dialog to the user with
// the error.
}
}
/*
* This is overridden method of interface
* GooglePlayServicesClient.ConnectionCallbacks which is called when
* locationClient is connected to google service. You can receive GPS
* reading only when this method is called.So request for location updates
* from this method rather than onStart()
*/
@Override
public void onConnected(Bundle arg0) {
mLocationClient.requestLocationUpdates(mLocationRequest, this);
}
@Override
public void onDisconnected() {
stopGPS();
}
/*
* Overridden method of interface LocationListener called when location of
* gps device is changed. Location Object is received as a parameter. This
* method is called when location of GPS device is changed
*/
@Override
public void onLocationChanged(Location location) {
if (location != null) {
this.location=location;
stopGPS();
}
}
/*
* Called when Service running in background is stopped. Remove location
* Update to stop receiving GPS reading
*/
public void stopGPS() {
try{
if(mLocationClient!=null){
if(mLocationClient.isConnected()){
mLocationClient.removeLocationUpdates(this);
mLocationClient=null;
}else{
mLocationClient=null;
}
}
if(mLocationRequest!=null){
mLocationRequest=null;
}
}catch(Exception e){
e.printStackTrace();
}
}
@Override
protected void onDestroy() {
stopGPS();
super.onDestroy();
}
@Override
public void onBackPressed() {
stopGPS();
super.onBackPressed();
}
}
NOte：您需要Google Play服务库作为附加项目。启用GPS，然后启用Chenck，..和以下权限：
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_GPS" />