我正在开发一个应用程序，因为我在地图中使用标记显示位置当前位置和数据库位置，现在我正在尝试将侦听器添加到当前位置标记，此处侦听器应用于当前位置但其他数据库标记也受到侦听器的影响，它在地图中点击数据库标记时引发异常，我的要求是应用于当前位置的监听器请验证我在代码中出错的地方
public class ShowMapWhenLoginActivity extends FragmentActivity implements LocationListener,
OnMarkerClickListener{
GoogleMap _googleMap;
LatLng myPosition;
LocationManager locationManger;
private Marker mCustomerMarker;
private double latitude;
private double langitude;
private String TITILE = "start";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_map_when_login);
_googleMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(
R.id.mapId)).getMap();
LocationManager service = (LocationManager)getSystemService(LOCATION_SERVICE);
boolean enableGPS = service.isProviderEnabled(LocationManager.GPS_PROVIDER);
boolean enableWiFi= service.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
/*if(!enableGPS || !enableWiFi){
Toast.makeText(ShowMapWhenLoginActivity.this, "GPS signal not found",
Toast.LENGTH_LONG).show();
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}*/
locationManger = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
String provider = service.getBestProvider(criteria, true);
service.requestLocationUpdates(provider, 0, 0, this);
if(_googleMap==null){
Toast.makeText(getApplicationContext(), "Google Map Not Available",
Toast.LENGTH_LONG).show();
}
_googleMap.setOnMarkerClickListener(this);
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
//locationManger.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0,
this);
//_googleMap.clear();
ArrayList<HashMap<String, String>> arl = (ArrayList<HashMap<String, String>>)
getIntent().getSerializableExtra("arrayList");
if(location!=null){
latitude = location.getLatitude();
langitude = location.getLongitude();
LatLng latlang = new LatLng(latitude, langitude);
myPosition = new LatLng(latitude, langitude);
}
if(arl.size()!=0){
for(int j = 0;j<arl.size();j++){
String lat =arl.get(j).get("lat").toString();
String lng =arl.get(j).get("lng").toString();
if ( !lat.trim().equals("") && !lng.trim().equals("") )
{
double Hlat = Double.parseDouble(lat.trim());
double Hlong= Double.parseDouble(lng.trim());
LatLng dabaseLocations =new LatLng(Hlat, Hlong);
getOtherLocation(dabaseLocations);
getCurrentLocation(myPosition);
// Show current location with database locations
}
}
}
else{
// Show Current Location Only
getCurrentLocation(myPosition);
}
}
@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 void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
Intent i = new Intent(ShowMapWhenLoginActivity.this,ShowMapWhenLoginActivity.class);
startActivity(i);
finish();
}*/
private void getOtherLocation(LatLng location){
mCustomerMarker = _googleMap.addMarker(new MarkerOptions()
.position(location)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE))
.flat(true));
}
private void getCurrentLocation(LatLng location){
_googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(myPosition,5));
_googleMap.addMarker(new MarkerOptions().position(location).title(TITILE));
}
@Override
public boolean onMarkerClick(Marker marker) {
// TODO Auto-generated method stub
if((marker.getTitle()).equals(TITILE)){
Toast.makeText(ShowMapWhenLoginActivity.this, "clicked", 100).show();
}
return true;
}
}
logcat的
03-10 16:17:47.482: E/AndroidRuntime(1395): FATAL EXCEPTION: main
03-10 16:17:47.482: E/AndroidRuntime(1395): java.lang.NullPointerException
03-10 16:17:47.482: E/AndroidRuntime(1395): at
com.technowellServices.traffic.ShowMapWhenLoginActivity.
onMarkerClick(ShowMapWhenLoginActivity.java:172)
03-10 16:17:47.482: E/AndroidRuntime(1395): at
com.google.android.gms.maps.GoogleMap$8.a(Unknown Source)
03-10 16:17:47.482: E/AndroidRuntime(1395): at c
om.google.android.gms.maps.internal.k$a.onTransact(Unknown Source)
03-10 16:17:47.482: E/AndroidRuntime(1395): at
android.os.Binder.transact(Binder.java:310)
03-10 16:17:47.482: E/AndroidRuntime(1395): at ejn.a(SourceFile:84)
03-10 16:17:47.482: E/AndroidRuntime(1395): at maps.e.bl.a(Unknown Source)
03-10 16:17:47.482: E/AndroidRuntime(1395): at maps.ay.c.a(Unknown Source)
03-10 16:17:47.482: E/AndroidRuntime(1395): at maps.ay.n.c(Unknown Source)
03-10 16:17:47.482: E/AndroidRuntime(1395): at maps.ay.m.a(Unknown Source)
03-10 16:17:47.482: E/AndroidRuntime(1395): at maps.ay.bg.b(Unknown Source)
03-10 16:17:47.482: E/AndroidRuntime(1395): at maps.ay.bc.onSingleTapConfirmed(Unknown Source)
03-10 16:17:47.482: E/AndroidRuntime(1395): at maps.bo.g.onSingleTapConfirmed(Unknown
Source)
03-10 16:17:47.482: E/AndroidRuntime(1395): at maps.bo.i.handleMessage(Unknown Source)
03-10 16:17:47.482: E/AndroidRuntime(1395): at
android.os.Handler.dispatchMessage(Handler.java:130)
03-10 16:17:47.482: E/AndroidRuntime(1395): at android.os.Looper.loop(SourceFile:351)
03-10 16:17:47.482: E/AndroidRuntime(1395): at
android.app.ActivityThread.main(ActivityThread.java:3814)
03-10 16:17:47.482: E/AndroidRuntime(1395): at
java.lang.reflect.Method.invokeNative(Native Method)
03-10 16:17:47.482: E/AndroidRuntime(1395): at
java.lang.reflect.Method.invoke(Method.java:538)
03-10 16:17:47.482: E/AndroidRuntime(1395): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
03-10 16:17:47.482: E/AndroidRuntime(1395): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:659)
03-10 16:17:47.482: E/AndroidRuntime(1395): at dalvik.system.NativeStart.main(Native
Method)
答案 0 :(得分：0)
试试如下：
@Override
public boolean onMarkerClick(Marker marker) {
// TODO Auto-generated method stub
if((marker.equals(mCustomerMarker)){
Toast.makeText(ShowMapWhenLoginActivity.this, "clicked", 100).show();
}
return false;
}