添加搜索位置的AsyncTask
所以我正在申请获得现在的位置。 下面的代码工作正常
String stringAddress = "";
public void getLocation(View view){
final LocationManager lm = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria kriteria = new Criteria();
kriteria.setAccuracy(Criteria.ACCURACY_FINE);
kriteria.setAltitudeRequired(false);
kriteria.setBearingRequired(false);
kriteria.setCostAllowed(true);
kriteria.setPowerRequirement(Criteria.POWER_LOW);
final String provider = lm.getBestProvider(kriteria, true);
final Location lokasi = lm.getLastKnownLocation(provider);
updateWithNewLocation(lokasi);
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 5, ll);
edittext_position.setText(stringAddress);
}
private void updateWithNewLocation(Location
if(lokasi != null){
double lat = lokasi.getLatitude();
double lng = lokasi.getLongitude();
Geocoder gc = new Geocoder(this, Locale.getDefault());
try{
List addresses = gc.getFromLocation(lat, lng, 1);
StringBuilder sb = new StringBuilder();
if(addresses.size()>0){
Address address = addresses.get(0);
sb.append(address.getAddressLine(0));
stringAddress= sb.toString();
}
} catch (Exception e){
}
}
}
private final LocationListener ll = new LocationListener() {
public void onStatusChanged(String provider, int status, Bundle extras) {
}
public void onProviderEnabled(String provider) {
}
public void onProviderDisabled(String provider) {
updateWithNewLocation(null);
}
public void onLocationChanged(Location location) {
updateWithNewLocation(location);
}
}
但问题是我每次调用getLocation（）函数时，应用程序都会在返回结果之前挂起几秒钟。 我知道使用一个SyncTask解决这个问题，但我不知道如何开始。 感谢你的帮助。
谢谢
这是我的应用程序片段：
public void getCurrentLocation(final ListenerGetCurrentLocation listenerGetCurrentLocation) {
new AsyncTask<Void, Void, List<Address>>() {
@Override
protected List<Address> doInBackground(Void... voids) {
Geocoder geo = new Geocoder(instance);
List<Address> listAddresses = null;
Criteria criteria = new Criteria();
String bestProvider = locationManager.getBestProvider(criteria, true);
if (bestProvider == null) {
bestProvider = LocationManager.NETWORK_PROVIDER;
}
Location location = locationManager.getLastKnownLocation(bestProvider);
try {
if (location != null) {
listAddresses = geo.getFromLocation(location.getLatitude(),
location.getLongitude(),
1);
}
} catch (IOException e) {
e.printStackTrace();
}
return listAddresses;
}
public void onPostExecute(List<Address> listAddresses) {
Address _address = null;
if ((listAddresses != null) && (listAddresses.size() > 0)) {
_address = listAddresses.get(0);
GeoPoint currentPosition = new GeoPoint(((int)(_address.getLatitude() * 1E6)),
((int)(_address.getLongitude() * 1E6)));
}
}
}.execute();
}
requestLocationUpdates()是异步的，它不会阻止你的应用程序。 它在后台轮询位置，然后调用监听器。
但是，gc.getFromLocation（）不是。 这可能是你滞后的原因
创建一个新的AsyncTask ，Eclipse会建议你重写这些方法
@Override
protected List<String> doInBackground(String... params) {
// this is done in the background so it won't block the UI. The return type must be set to List<String> (I think default is just String)
return gc.getFromLocation()
}
@Override
protected void onPostExecute(List<String> adresses) {
// called when the GC work is finished. You can now use your list of addresses and display them
}
不要忘记在你的任务上调用execute() 。