我想点击一个按钮,接收当前的位置,我知道我不能立即得到位置,所以这是我做的: 单击事件:
I want to click a button and receive the current location, i understand that i can't instantly get the location , so this is what i did : the click event :
public void onClick(View v)
{
ProgressDialog MyDialog = ProgressDialog.show( MainPage.this, " " , " Loading. Please wait ... ", true);
MyActionsHandler myActionsHandler = new myActionsHandler(MainPage.this);
myActionsHandler.startSearch();
MyDialog.dismiss();
Intent intent = new Intent(MainPage.this, ResultPage.class);
startActivity(intent);
}
和这是搜索位置的处理程序
and this is the handler that searches for the location
public void startSearch(long timeInterval,float distanceInterval)
{
LocationManager lm = (LocationManager)_context.getSystemService(Context.LOCATION_SERVICE);
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, timeInterval,
distanceInterval, this);
while(!_locationFound)
{
//wait till location is found
}
}
public void onLocationChanged(Location location)
{
if (location != null)
{
double latitude = location.getLatitude();
double longitude = location.getLongitude();
float speed = location.getSpeed();
float bearing = location.getBearing();
Log.d("LOCATION CHANGED", location.getLatitude() + "");
Log.d("LOCATION CHANGED", location.getLongitude() + "");
try
{
doTheProcess(_searchType,latitude, longitude, speed, bearing);
_locationFound = true;
}
catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
我明白,这是不行的,因为环是在同一个线程, 所以你有什么建议最好的解决办法做到这一点?
I understand that this doesn't work, because the loop is in the same thread, so what do you suggest the best solution to do it?
在requestLocationUpdates的javadoc的,有调用线程必须是环线,如呼叫活动的主线。但我没有找到任何的例子,所以我不知道这是正确的解决方案。
in the javadoc of requestLocationUpdates , there is "The calling thread must be a Looper thread such as the main thread of the calling Activity." but i haven't found any example so i don't know if it's the right solution.
一个问题,
请问 getLastKnownLocation()
工作,即使我连接从来没有叫locationManager?
谢谢
one more question,
does the getLastKnownLocation()
work even i fi never called the locationManager before?
thanks
我有同样的问题before..but我已经得到了solution..this是获得位置瞬间最简单的方法。
I have same problem before..but I have got the solution..this is the simplest way to get location instantly.
public class LocationFinder extends Activity {
TextView textView1;
Location currentLocation;
double currentLatitude,currentLongitude;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
textView1 = (TextView) findViewById(R.id.textView1);
Log.i("@@@@@@@@@@ Inside LocationFinder onCreate", "LocationFinder onCreate");
FindLocation();
}
public void FindLocation() {
LocationManager locationManager = (LocationManager) this
.getSystemService(Context.LOCATION_SERVICE);
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
updateLocation(location);
Toast.makeText(
LocationFinder.this,
String.valueOf(currentLatitude) + "\n"
+ String.valueOf(currentLongitude), 5000)
.show();
}
public void onStatusChanged(String provider, int status,
Bundle extras) {
}
public void onProviderEnabled(String provider) {
}
public void onProviderDisabled(String provider) {
}
};
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
}
void updateLocation(Location location) {
currentLocation = location;
currentLatitude = currentLocation.getLatitude();
currentLongitude = currentLocation.getLongitude();
textView1.setText(String.valueOf(currentLatitude) + "\n"
+ String.valueOf(currentLongitude));
}
}