NullPointerException whiling 试图聚集标记谷歌地图

Question

我正在我的应用程序上构建地图，一切正常，直到我将我的 ClusterItem 添加到我的集群管理器中抛出异常：

尝试从空对象引用上的字段"double com.google.android.gms.maps.model.LatLng.longitude"读取

public class MapaActivity extends FragmentActivity implements OnMapReadyCallback {
BancoDadosController bancoDadosController;
private List<Obra> listaPlot;
private String numObra, numeroObra, tipoObra, descricao;
private double latitude;
private double longitude;
private String geoPonto;
private GoogleMap gMap;
private LatLng pontoFinal;
private ClusterManager<ItemCluster> mClusterManager;
private ItemCluster itemCluster;

private SharedPreferences pegaIdJurisdicionado;
private static final String USER_AUTH = "Autentication";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mapa);
//getSupportActionBar().setDisplayShowHomeEnabled(true);

bancoDadosController = new BancoDadosController(this);
pegaIdJurisdicionado = getSharedPreferences(USER_AUTH,0);
String idJurisdicionado = pegaIdJurisdicionado.getString("idJurisdicionado", null);
listaPlot = bancoDadosController.buscarListaMapa("3", "5527");
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.mapaDespesa);
mapFragment.getMapAsync(this);
}
private void setUpClusterer(GoogleMap googleMap) {
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(-7.116289, -34.850414), 4.5f));
mClusterManager = new ClusterManager<ItemCluster>(this, googleMap);
mClusterManager.setRenderer(new IconePersonalizado(MapaActivity.this, googleMap,mClusterManager));
final IconePersonalizado iconePersonalizado = new IconePersonalizado(this,gMap,mClusterManager);
mClusterManager.setRenderer(iconePersonalizado);
mClusterManager.getMarkerCollection().setOnInfoWindowAdapter(new InfoWindowMapa(LayoutInflater.from(this)));
gMap.setInfoWindowAdapter(mClusterManager.getMarkerManager());
googleMap.setOnCameraIdleListener(mClusterManager);
googleMap.setOnMarkerClickListener(mClusterManager);
googleMap.setOnInfoWindowClickListener(mClusterManager);
addItemsCluster();
}
private void addItemsCluster() {
for (int i = 0; i < listaPlot.size(); i++) {
geoPonto = listaPlot.get(i).getGeoReferenciamento();
pontoFinal = tratamentoGeoPonto(geoPonto);

numObra = listaPlot.get(i).getNumeroObra();
tipoObra = listaPlot.get(i).getTipoObra();
descricao = listaPlot.get(i).getDescricaoObra();
itemCluster = new ItemCluster(pontoFinal, numObra, tipoObra, descricao);
try{
mClusterManager.addItem(itemCluster);
}catch (NullPointerException e){
Log.d("Andre", String.valueOf(itemCluster.getPosition()));
e.printStackTrace();
}
}
}
private LatLng tratamentoGeoPonto(String valor){
String geoPontoFormatado = "";
geoPontoFormatado = valor.substring(1, (valor.length()-1));
String[] pontos = geoPontoFormatado.split(",");
double lat = Double.parseDouble(pontos[0]);
double lngt = Double.parseDouble(pontos[1]);
LatLng pontoTratado = new LatLng(lat, lngt);
return pontoTratado;
}
@Override
public void onMapReady(GoogleMap googleMap) {
gMap = googleMap;
gMap.getUiSettings().setRotateGesturesEnabled(false);
gMap.getUiSettings().setZoomControlsEnabled(true);
setUpClusterer(gMap);
mClusterManager.setOnClusterItemInfoWindowClickListener(new ClusterManager.OnClusterItemInfoWindowClickListener<ItemCluster>() {
@Override
public void onClusterItemInfoWindowClick(ItemCluster itemCluster) {
numeroObra = itemCluster.getNumeroObra();
Intent passarObra = new Intent(MapaActivity.this,CardObraActivity.class);
passarObra.putExtra("obraDigitada",numeroObra);
startActivity(passarObra);
}
});
mClusterManager.setOnClusterItemClickListener(new ClusterManager.OnClusterItemClickListener<ItemCluster>() {
@Override
public boolean onClusterItemClick(ItemCluster itemCluster) {
return false;
}
});
mClusterManager.setOnClusterClickListener(new ClusterManager.OnClusterClickListener<ItemCluster>() {
@Override
public boolean onClusterClick(Cluster<ItemCluster> cluster) {
float teste = gMap.getCameraPosition().zoom;
CameraPosition cameraPosition = new CameraPosition.Builder().target(new LatLng(latitude, longitude)).zoom(teste+6).build();
gMap.moveCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
return false;
}
});
}

}

这是我的 ClusterItem 类：

public class ItemCluster implements ClusterItem{
private LatLng mPosition;
private String numeroObra;
private String descricao;
private String tipoObra;
public ItemCluster(LatLng mPosition, String numeroObra, String descricao, String tipoObra) {
this.mPosition = mPosition;
this.numeroObra = numeroObra;
this.descricao = descricao;
this.tipoObra = tipoObra;
}
public LatLng getmPosition() {
return mPosition;
}
public String getNumeroObra() {
return numeroObra;
}
public String getDescricao() {
return descricao;
}
public String getTipoObra() {
return tipoObra;
}
@Override
public LatLng getPosition() {
return null;
}
@Override
public String getTitle() {
return null;
}
@Override
public String getSnippet() {
return null;
}

}

我所有的变量都有值，在达到这个函数之前一切都可以

private void addItemsCluster() {
for (int i = 0; i < listaPlot.size(); i++) {
geoPonto = listaPlot.get(i).getGeoReferenciamento();
pontoFinal = tratamentoGeoPonto(geoPonto);

numObra = listaPlot.get(i).getNumeroObra();
tipoObra = listaPlot.get(i).getTipoObra();
descricao = listaPlot.get(i).getDescricaoObra();
itemCluster = new ItemCluster(pontoFinal, numObra, tipoObra, descricao);
try{
mClusterManager.addItem(itemCluster);
}catch (NullPointerException e){
Log.d("Andre", String.valueOf(itemCluster.getPosition()));
e.printStackTrace();
}
}
}

这是我的选择函数，用于返回我的列表以绘制地图

public List<Obra> buscarListaMapa(String tipoGeoReferenciamentoFiltro, String idJurisdicionadoFiltro) {
SQLiteDatabase db = helper.getReadableDatabase();
Cursor cursor = db.rawQuery("SELECT * FROM " + BancoDadosHelper.TABELA_OBRA + " WHERE "+ BancoDadosHelper.COLUNA_ID_TIPO_GEOREFERENCIAMENTO + " = '"+tipoGeoReferenciamentoFiltro+"' and "+
BancoDadosHelper.COLUNA_ID_JURISDICIONADO+" = '"+idJurisdicionadoFiltro+"'", null);

List<Obra> listaMapa = new ArrayList<>();
if (cursor.moveToFirst()) {
do {
String numObra = cursor.getString(cursor.getColumnIndex(BancoDadosHelper.COLUNA_NUM_OBRA));
String descObra = cursor.getString(cursor.getColumnIndex(BancoDadosHelper.COLUNA_DESCRICAO_OBRA));
String geoReferenciamento = cursor.getString(cursor.getColumnIndex(BancoDadosHelper.COLUNA_GEOREFERENCIAMENTO));
String tipoObra = cursor.getString(cursor.getColumnIndex(BancoDadosHelper.COLUNA_TIPO_OBRA));
Obra novaObra = new Obra(numObra, descObra, tipoObra, geoReferenciamento);
listaMapa.add(novaObra);
} while (cursor.moveToNext());
}
cursor.close();
db.close();
return listaMapa;
}

Answer 1

问题可能出在 ItemCluster.class，在你的例子中，getPosition(( 返回 null。

@Override
public LatLng getPosition() {
return new LatLng(getSLatitude(), getSLongitude());
}