我正在尝试实现一个侦听器,以监视标记(Google Maps API)上的所有点击,以允许在标记点击事件触发器后调用该函数。但是,每当我包含事件侦听器代码时,应用程序就会崩溃。
事件监听器-setOnMarkerClickListener
如何正确实现此侦听器并处理崩溃?
我已经使用的代码是:
mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
@Override
public boolean onMarkerClick(Marker marker) {
// TODO Auto-generated method stub
if(marker.equals(ibrox)){
Log.w("Click", "test");
return true;
}
return false;
}
});
我希望程序运行时不会崩溃,并且该功能可以记录“测试”。
编辑: ibrox变量的值-
private static final LatLng ibrox = new LatLng(55.8522161, -4.3138359);
完整代码:
package com.example.googlemaps;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
private static final LatLng ibrox = new LatLng(55.8522161, -4.3138359);
private Marker mIbrox;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
@Override
public boolean onMarkerClick(Marker marker) {
// TODO Auto-generated method stub
if(marker.equals(ibrox)){
Log.w("Click", "test");
return true;
}
return false;
}
});
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(40.7589, -73.9851);
mIbrox = mMap.addMarker(new MarkerOptions()
.position(ibrox)
.title("Ibrox"));
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in a place"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
}
答案 0 :(得分:2)
请确保mMap不为null。 您需要在onMapReady方法中设置侦听器。
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
@Override
public boolean onMarkerClick(Marker marker) {
// TODO Auto-generated method stub
if(marker.equals(ibrox)){
Log.w("Click", "test");
return true;
}
return false;
}
});
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(40.7589, -73.9851);
mIbrox = mMap.addMarker(new MarkerOptions()
.position(ibrox)
.title("Ibrox"));
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in a place"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
答案 1 :(得分:0)
您可以尝试移动
mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() { @Override public boolean onMarkerClick(Marker marker) { // TODO Auto-generated method stub if(marker.equals(ibrox)){ Log.w("Click", "test"); return true; } return false; } });
到onMapReady()方法。