【发布时间】:2017-03-31 12:32:07
【问题描述】:
我已按照本教程 http://www.androidhive.info/2012/07/android-gps-location-manager-tutorial/ 在未启用 GPS 时显示弹出窗口并获取用户当前位置。
这是监听 GPS 启用禁用条件的广播接收器
private BroadcastReceiver mGpsSwitchStateReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().matches("android.location.PROVIDERS_CHANGED")) {
gps = new GPSTracker(getActivity());
if(gps.canGetLocation()){
Log.d("Your Location", "latitude:" + gps.getLatitude() + ", longitude: " + gps.getLongitude());
Toast.makeText(getActivity(), "GPS Switch", Toast.LENGTH_SHORT).show();
if(gps.getLatitude() != 0 && gps.getLongitude() != 0 ){
final CameraPosition cameraPosition = new CameraPosition.Builder()
.target(new LatLng(gps.getLatitude(),gps.getLongitude())) // Sets the center of the map to selected place
.zoom(15) // Sets the zoom
.build(); //
gMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
Toast.makeText(getActivity(), "GPS Switch Lat: "+gps.getLatitude()+" Long: "+gps.getLongitude(), Toast.LENGTH_SHORT).show();
}
} else {
if(!gps.isSettingDialogShown())
gps.showSettingsAlert();
}
}
}
};
当我通过设置对话框或下拉菜单启用 GPS 时。 GPSTracker 类获取位置服务并在此代码片段中检查用户的当前位置
public Location getLocation() {
try {
locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,MIN_TIME_BW_UPDATES,MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network Enabled");
if (locationManager != null) {
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS", "GPS Enabled");
if (locationManager != null) {
location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (SecurityException e) {
e.printStackTrace();
}
return location;
}
问题:
首先我不知道为什么广播接收器会收到两次动作,其次在正常模式下接收器中的 lat lng 值保持为零,但在调试中有时它会返回用户当前位置的值。
你能帮我做错吗?
【问题讨论】:
-
使用 google Fused Location Api 和位置设置,Check this
-
@CommonsWare 我不明白打开 GPS 后如何在广播接收器中获取 lat lng ?在你的回答中,你说避免使用 getLastKnownLocation() 那么用什么来代替呢?
-
使用
requestLocationUpdates(),您可以在其中获得LocationListener中的位置。这包含在我链接的答案中,请参阅步骤 #2 和 #3。
标签: android google-maps geolocation gps android-gps