我需要找到当前的纬度和经度来获取地址,但它不起作用。
这是我的意思:
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
我的java代码:
public void GetCurrentLocal() throws IOException{
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String provider = locationManager.getBestProvider(criteria, true);
Location myLocation = locationManager.getLastKnownLocation(provider);
double latitude = myLocation.getLatitude();
double longitude = myLocation.getLongitude();
Geocoder geocoder;
List<Address> addresses;
geocoder = new Geocoder(this, Locale.getDefault());
addresses = geocoder.getFromLocation(latitude, longitude, 1);
String address = addresses.get(0).getAddressLine(0);
System.out.println(address);
}
感谢。
答案 0 :(得分:3)
如果它在评论中提到的myLocation.getLatitude();
上失败,则意味着locationManager.getLastKnownLocation(provider);
没有返回最后一个已知位置,因为它没有,所以它返回null,这是您有NullPointerExeception
错误的原因。在这种情况下,您需要实现LocationListener
,并在收到至少一个位置更新后运行此方法。
要实施LocationListener
,您可以查看以下示例:
http://www.androidhive.info/2012/07/android-gps-location-manager-tutorial/
我想这个阅读材料对你来说也很方便:
http://android-developers.blogspot.de/2011/06/deep-dive-into-location.html
答案 1 :(得分:0)
我有这个代码,对我而言
private Location getMyLocation() {
// Get location from GPS if it's available
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location myLocation = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
// Location wasn't found, check the next most accurate place for the
// current location
if (myLocation == null) {
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_COARSE);
// Finds a provider that matches the criteria
String provider = lm.getBestProvider(criteria, true);
// Use the provider to get the last known location
myLocation = lm.getLastKnownLocation(provider);
}
return myLocation;
}
Location location = this.getMyLocation();
LatLng locationGPS = new LatLng(location.getLatitude(), location.getLongitude());