我有一个方法,叫的getLocation()是查找当前设备的位置感谢FusedLocationClient。这种方法的调用后,我又找到了位置的纬度和经度,并与putExtra我这些值传递到另一个活动。在的getLocation()我有在显示纬度和经度打印吐司,并且收到了正确的位置。在活动中我有一个显示我从在MainActivity发送纬度和经度的值,另一个烤面包,但结果却是经度和纬度都为null。如果我回去,然后重新启动活动我得到的经度和纬度的不是空值。这方面有任何想法?
其他CODE:
case R.id.nearYou:
i = new Intent(MainActivity.this, Ricerca1.class);
if (!isGPS) {
Toast.makeText(this, "Please turn on GPS",
Toast.LENGTH_SHORT).show();
return;
}
isContinue = false;
getLocation();
latitudine = wayLatitude.toString();
longitudine = wayLongitude.toString();
i.putExtra("latPar", longitudine);
i.putExtra("lonPar", latitudine);
i.putExtra("radiusPar", "0.5");
i.putExtra("categoryPar", "Museum;Botanical_and_zoological_gardens;Churches;Cultural_centre;Cultural_sites;Historical_buildings;Library;Monument_location;Photographic_activities;Squares;Theatre;");
startActivity(i);
break;
的getLocation:
private void getLocation() {
if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION},
AppConstants.LOCATION_REQUEST);
} else {
if (isContinue) {
mFusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, null);
} else {
mFusedLocationClient.getLastLocation().addOnSuccessListener(MainActivity.this, location -> {
if (location != null) {
wayLatitude = location.getLatitude();
wayLongitude = location.getLongitude();
Toast.makeText(MainActivity.this,String.format(Locale.US, "%s - %s", wayLatitude, wayLongitude), Toast.LENGTH_SHORT).show();
} else {
mFusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, null);
}
});
}
}
}
你应该startActivity后吐司消息中的getLocation()。
为什么?
因为,的getLocation等待监听器(addOnSuccessListener)的完成,你完成前开始活动。
您的代码将是:
private void getLocation() {
if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION},
AppConstants.LOCATION_REQUEST);
} else {
if (isContinue) {
mFusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, null);
} else {
mFusedLocationClient.getLastLocation().addOnSuccessListener(MainActivity.this, location -> {
if (location != null) {
wayLatitude = location.getLatitude();
wayLongitude = location.getLongitude();
Toast.makeText(MainActivity.this,String.format(Locale.US, "%s - %s", wayLatitude, wayLongitude), Toast.LENGTH_SHORT).show();
//Code from OTHER CODE
latitudine = wayLatitude.toString();
longitudine = wayLongitude.toString();
i.putExtra("latPar", longitudine);
i.putExtra("lonPar", latitudine);
i.putExtra("radiusPar", "0.5");
i.putExtra("categoryPar", "Museum;Botanical_and_zoological_gardens;Churches;Cultural_centre;Cultural_sites;Historical_buildings;Library;Monument_location;Photographic_activities;Squares;Theatre;");
startActivity(i);
} else {
mFusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, null);
}
});
}
}
}