Android 地图上未显示位置更改
我想写一个应用程序,通过使用GPS跟踪人们,以便通过短信将坐标(纬度和经度)发送到android手机,并将坐标值显示在谷歌地图上的准确位置 工作系统分为两类Android 地图上未显示位置更改,android,Android,我想写一个应用程序,通过使用GPS跟踪人们,以便通过短信将坐标(纬度和经度)发送到android手机,并将坐标值显示在谷歌地图上的准确位置 工作系统分为两类 1.SMSReceiver类:接收SMS,然后将作为字符串值的坐标值转换为双值 这是我的密码: package com.google.android; import android.content.BroadcastReceiver; import android.content.Context; import android.conte
1.SMSReceiver类:接收SMS,然后将作为字符串值的坐标值转换为双值 这是我的密码:
package com.google.android;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.SmsMessage;
public class SMSReceiver extends BroadcastReceiver {
public String slat;
public String slng;
public double dLat;
public double dLng;
public double getLat() {
return this.dLat;
}
public double getLng() {
return this.dLng;
}
@Override
public void onReceive(Context context, Intent intent) {
//---get the SMS message passed in---
Bundle bundle = intent.getExtras();
SmsMessage[] msgs = null;
String position1 = "";
if (bundle != null) {
//---retrieve the SMS message received---
Object[] pdus = (Object[]) bundle.get("pdus");
msgs = new SmsMessage[pdus.length];
for (int i=0; i<msgs.length; i++){
msgs[i] = SmsMessage.createFromPdu((byte[])pdus[i]);
position1 += msgs[i].getMessageBody().toString();
}
String position2 = position1.substring(position1.indexOf(" ")+1, position1.length());
slat = position1.substring(position1.indexOf(":")+1, position1.indexOf(" "));
slng = position2.substring(position2.indexOf(":")+1, position2.indexOf(" "));
dLat = Double.parseDouble(slat);
dLng = Double.parseDouble(slng);
}
}
}
package com.google.android;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Point;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
import android.widget.ZoomControls;
public class TrackingActivity extends MapActivity {
/** Called when the activity is first created. */
private LocationManager locationManager;
private LocationListener locationListener;
private MapView mapView;
private MapController mapController;
private Button btnSatelite;
private Button btnStreet;
private ZoomControls zoomControls;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
btnSatelite = (Button)findViewById(R.id.btnSatelite);
btnSatelite.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// TODO Auto-generated method stub
mapView.setTraffic(false);
mapView.setSatellite(true);
}
}
);
btnStreet = (Button)findViewById(R.id.btnStreet);
btnStreet.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
mapView.setSatellite(false);
mapView.setTraffic(true);
}
}
);
zoomControls = (ZoomControls)findViewById(R.id.zoomControls1);
zoomControls.setOnZoomInClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mapController.zoomIn();
}
});
zoomControls.setOnZoomOutClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mapController.zoomOut();
}
});
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
locationListener = new MyLocationListener();
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 1, locationListener);
mapView = (MapView)findViewById(R.id.mapview1);
mapController = mapView.getController();
}
private class MyLocationListener implements LocationListener {
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
SMSReceiver Lat = null;
SMSReceiver Lng = null;
/*if (location != null) {
Toast.makeText(getBaseContext(), "Latitude: " + Lat.getLat() + " Longtitude: " + Lng.getLng(), Toast.LENGTH_SHORT).show();
}*/
GeoPoint point = new GeoPoint((int) (Lat.getLat() * 1E6),(int) (Lng.getLng() * 1E6));
mapController.animateTo(point);
mapController.setZoom(18);
...
mapView.invalidate();
}
...
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
...
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
}
在我从SMS收到坐标值后,地图上没有显示位置变化。我想这可能是因为Tracking类不能引用SMS receiver类的坐标值。请给我一些建议我应该怎么做来解决这个问题。基本上我不理解你的代码:我不理解你的短信接收者的意思,如果你应该通过短信接收新职位,你应该在你的短信接收者和你的MapActivity之间建立连接 您在这里基本上要做的是设置一个函数,当您的GPS获得新的定位时调用该函数(当您收到新的SMS时不会调用该函数): 此外,在onLocationChanged()中,您将两个对象设置为null,并尝试访问它们的属性,这当然会给您一个NullPointerException
我建议您将您的短信接收器更改为在接收短信时处理侦听器。谢谢您的建议。这有帮助吗?如果这是你等待的答案,勾选它
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 1, locationListener);