我想知道当他在特定位置附近时是否有任何方式通知用户 当用户靠近该位置时，通知会发送到他的电话，提醒他他的位置。
我正在尝试使用以下代码，但它无效。
public class NotifyuserActivity extends Activity {
LocationManager locMan;
double lat;
double lon;
NotificationManager notMan;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
locMan=(LocationManager) getSystemService(LOCATION_SERVICE);
locMan.requestLocationUpdates(LocationManager.GPS_PROVIDER,1000,10, mylistener);
}
LocationListener mylistener = new LocationListener（）{
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
lat = location.getLatitude();
lon = location.getLongitude();
CharSequence from = "AlarmManager - Time's up!";
CharSequence message = "This is your alert";
Location tasklocation=new Location(LocationManager.GPS_PROVIDER);
double dis1 = location.distanceTo(tasklocation);
tasklocation.setLatitude(22.727733);
tasklocation.setLongitude(75.886079);
if(dis1 < 200.00)
{
notMan = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
Notification n = new Notification(R.drawable.ic_launcher, "Click here for details", System.currentTimeMillis());
Intent notificationIntent = new Intent(NotifyuserActivity.this,NotifyuserActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(NotifyuserActivity.this, 0, notificationIntent, 0);
n.setLatestEventInfo(NotifyuserActivity.this, from,message, pendingIntent);
notMan.notify(10001, n);
Toast.makeText(NotifyuserActivity.this,"Distance to location is: " + dis1, Toast.LENGTH_LONG).show();
}
}
};
}
答案 0 :(得分：1)
答案是肯定的。
您可以使用一些时间或距离间隔设置注册LocationListener到LocationManager，然后在更改位置时，可以将其与您设置的内容进行比较，以决定是否通知用户。
GPS消耗大量电池电量，因此您最好首先使用网络位置提供商，然后当它离该位置不远时，启动GPS。
正如评论所说，你应该先行动
tasklocation.setLatitude(22.727733);
tasklocation.setLongitude(75.886079);
上面
double dis1 = location.distanceTo(tasklocation);
（更好的是，您可以将这些位置设置移出onLocationChanged()而不是硬编码纬度/经度。）
这可能无法解决您的问题，但不执行此操作永远不会解决问题。所以不要留下这样的错误。
然后，我应该说这段代码对我有用（在我的模拟器中），我看不出你给出的其他错误可能会让你“不工作”。
您可以查看
的权限<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
或者可以显示Toast结果或Logcat输出。
毕竟，有关“不工作”的详细信息。
答案 1 :(得分：0)
答案 2 :(得分：0)
此处位置更改代码..尝试此。
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
if (location != null) {
System.out.println("in onlocationchanged");
String locationString=location.convert(location.getLatitude(),1);
Toast.makeText(this,"locationString=="+locationString, Toast.LENGTH_LONG).show();
double lat = location.getLatitude();
double lng = location.getLongitude();
String currentLocation = "The location is changed to Lat: " + lat + " Lng: " + lng;
Toast.makeText(this,currentLocation, Toast.LENGTH_LONG).show();
p = new GeoPoint((int) lat * 1000000, (int) lng * 1000000);
// check in database if we have same lattitude & longitude
MySQLiteHelper m=new MySQLiteHelper(getBaseContext());
Log.d("Reading: ", "Reading all contacts..");
List<LocWiseProfileBeans> LocWiseProfile= m.getAllLocWiseProfile();
for (LocWiseProfileBeans cn : LocWiseProfile) {
String log = "Loc Name: "+cn.getLocname()+" ,Lattitude: " + cn.getLattitude()+ " ,Longitude: " + cn.getLongitude()+ " , Selected Profile :"+cn.getSelectedprofile();
// Writing Contacts to log
double distance2=00.00;
GeoPoint storedLocation=new GeoPoint(
(int) cn.getLattitude() * 1000000,(int) cn.getLongitude() * 1000000);
Location locationB = new Location("point B");
locationB.setLatitude((int) cn.getLattitude() * 1000000);
locationB.setLongitude((int) cn.getLongitude() * 1000000);
distance2=distFrom(lat,lng,cn.getLattitude(),cn.getLongitude());
if(distance2>1 )
{
Log.d("Name: ", log);
Toast.makeText(this, "Loc Name:"+log, Toast.LENGTH_SHORT).show();
Toast.makeText(this,"identical", Toast.LENGTH_LONG).show();
Toast.makeText(this,"distance2======"+distance2, Toast.LENGTH_SHORT).show();
sendnotification("Locale Notifications","You visited location " + cn.getLocname());
}
此代码用于通知用户。
protected void sendnotification (String title, String message) {
String ns = Context.NOTIFICATION_SERVICE;
NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);
int icon = R.drawable.icon;
CharSequence tickerText = message;
long when = System.currentTimeMillis();
Notification notification = new Notification(icon, tickerText, when);
Context context = getApplicationContext();
CharSequence contentTitle = title;
CharSequence contentText = message;
Intent notificationIntent = new Intent(this, GoogleMapsActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
notification.flags = Notification.FLAG_AUTO_CANCEL;
notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
mNotificationManager.notify(1, notification);
}
这是将经度和纬度转换为英里的功能。
public static double distFrom(double lat1, double lng1, double lat2, double lng2) {
double earthRadius = 3958.75;
double dLat = Math.toRadians(lat2-lat1);
double dLng = Math.toRadians(lng2-lng1);
double a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) *
Math.sin(dLng/2) * Math.sin(dLng/2);
double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
double dist = earthRadius * c;
return dist;
}
根据您的代码，您需要根据需要进行更改....