Question

enter image description here 我正在开展一个项目，我必须为当前位置添加标记，并根据我的json响应添加多个标记。

一切正常但在将setInfoAdapter添加到地图对象后，当我点按该标记时，显示我当前位置的标记会导致应用崩溃。

我哪里错了？请建议我。

这是我的活动。

public class MapActivity extends Activity implements LocationListener {

    private ProgressDialog pDialog;
    private GoogleMap gMap;
    private LocationManager locationManager;
    private String provider;
    boolean gps_enabled = false;
    boolean netwrk_enabled = false;
    String phone = null;
    JSONArray json;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_map);
        gMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
                .getMap();
        gMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(
                23.40276491, 77.51953125), 5));

        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        gps_enabled = locationManager
                .isProviderEnabled(LocationManager.GPS_PROVIDER);

        netwrk_enabled = locationManager
                .isProviderEnabled(LocationManager.NETWORK_PROVIDER);
        if (gps_enabled)
            provider = LocationManager.GPS_PROVIDER;
        else
            provider = LocationManager.NETWORK_PROVIDER;
        locationManager.requestLocationUpdates(provider, 5000L, 10F, this);

        Location location = locationManager.getLastKnownLocation(provider);


//Moving and adding marker to my current location here

        CameraPosition cp = new CameraPosition(new LatLng(
                location.getLatitude(), location.getLongitude()), 13, 0, 0);
        gMap.animateCamera(CameraUpdateFactory.newCameraPosition(cp), 3000,
                null);

        gMap = ((MapFragment) getFragmentManager().findFragmentById(
                R.id.map)).getMap();

        Marker marker = gMap.addMarker(new MarkerOptions()
                .position(
                        new LatLng(location.getLatitude(), location
                                .getLongitude())).title("I am here").icon(BitmapDescriptorFactory.fromResource(R.drawable.mrk1)));
        marker.showInfoWindow();


        if (location != null) {

            if (provider == LocationManager.GPS_PROVIDER)
                Toast.makeText(getApplicationContext(), "location by gps",
                        Toast.LENGTH_SHORT).show();
            else if (provider == LocationManager.NETWORK_PROVIDER)
                Toast.makeText(getApplicationContext(), "location by network",
                        Toast.LENGTH_SHORT).show();

            new HttpGetTask().execute();
        }

    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub18d1:d002
        super.onPause();
        locationManager.removeUpdates(this);
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        locationManager.requestLocationUpdates(provider, 400, 1, this);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.map, menu);
        return true;
    }

    @Override
    public void onLocationChanged(Location location) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub
        Toast.makeText(this, "Disabled provider " + provider,
                Toast.LENGTH_SHORT).show();

    }

    @Override
    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub

        Toast.makeText(this, "Enabled new provider " + provider,
                Toast.LENGTH_SHORT).show();

    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }

    private class HttpGetTask extends AsyncTask<Void, Void, String> {

//http request
        }

        @Override
        protected void onPostExecute(String result) {

            if (pDialog.isShowing())
                pDialog.dismiss();
            try {
                 json = new JSONArray(result);

                for (int i = 0; i < json.length(); i++) {
                    Log.v("Response", result);
                    final JSONObject e = json.getJSONObject(i);
                    String point = e.getString("point");
                    Log.v("POINT", point);
                    phone = e.getString("ph");
                    Log.v("PH", phone);

                    String[] point2 = point.split(",");
                    double lat1 = Double.parseDouble(point2[0]);
                    double lng1 = Double.parseDouble(point2[1]);
                    Log.v("LLDN", "" + lat1 + "&" + lng1);

//Adding multiple markers to my map

                    gMap.addMarker(new MarkerOptions()
                            .title(e.getString("name"))
                            .snippet(
                                    e.getString("LS")+"-"+e.getString("ph") )
                            .position(new LatLng(lng1, lat1))
                            .icon(BitmapDescriptorFactory
                                    .fromResource(R.drawable.pmr)));

                }
            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

//Adding infoWindowAdapter to my markers.

            gMap.setInfoWindowAdapter(new InfoWindowAdapter() {

                @Override
                public View getInfoWindow(Marker arg0) {
                    // TODO Auto-generated method stub
                    return null;
                }

                @Override
                public View getInfoContents(Marker mrkr) {
                    // TODO Auto-generated method stub
                    String name = mrkr.getTitle();
                    String detail = mrkr.getSnippet();
                    String trimmedDetail = detail.substring(0, 60);

                    Log.v("Info", name + " " + detail);
                    View v = getLayoutInflater().inflate(R.layout.infowindow,
                            null);
                    TextView title = (TextView) v.findViewById(R.id.titleTV);
                    TextView snippet = (TextView) v
                            .findViewById(R.id.snippetTV);

                    title.setText("" + name);
                    snippet.setText("" + trimmedDetail);

                    return v;
                }
            });

            gMap.setOnInfoWindowClickListener(new OnInfoWindowClickListener() {

                @Override
                public void onInfoWindowClick(Marker arg0) {
                    Intent myIntent = new Intent(getBaseContext(),
                            DtActivity.class);
                    myIntent.putExtra("title", arg0.getTitle());
                    myIntent.putExtra("detail", arg0.getSnippet());
                    //myIntent.putExtra("ph1", phone);

                    startActivity(myIntent);

                }
            });

            if (null != mClient)
                mClient.close();

        }
    }

导致NullPointerException，因为我没有在该标记中传递代码段。

我不想要任何infoWindow作为该标记。如何实现这一目标。？

我尝试再创建一个GoogleMap对象，并添加了显示该对象当前位置的标记，但结果相同。

我尝试禁用该标记的MouseClickEvent。它禁用所有标记点击事件。

我可以使用叠加添加该标记。？

Answer 1

我编写了一种在Google地图上添加标记的方法，通过它我可以找到标记ID。看看下面：

String markerID = null;
private void addMarker(GoogleMap map, double lat, double lon, String title, String snippet, int resourceId)
    {
        markerID = map.addMarker(new MarkerOptions().position(new LatLng(lat, lon)).title(title).snippet(snippet).icon(BitmapDescriptorFactory.fromResource(resourceId))).getId();
    }

并使用该标记ID在标记的OnClickListener中进行匹配：

@Override
 public View getInfoWindow(final Marker marker)
 {
      if(!marker.getId().equals(markerID))
           //do your code
      else
           //do your code
  }

标记水龙头导致崩溃

1 个答案: