Question

我正在开发一个调用远程服务器获取数据的项目。服务器提供纬度，经度和一些信息。我可以调用服务器并获得响应。但我没有得到如何从该响应中提取数据并在地图上绘制标记。

这是我的代码

public class NearActivity extends Activity实现LocationListener {

GoogleMap gMap;
private LocationManager locationManager;
private String provider;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_near);
    gMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
            .getMap();

    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    Criteria criteria = new Criteria();
    provider = locationManager.getBestProvider(criteria, false);
    Location location = locationManager.getLastKnownLocation(provider);

    if (location != null) {

        new HttpGetTask().execute();

        gMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(
                location.getLatitude(), location.getLongitude()), 14));

        gMap.addMarker(new MarkerOptions()
                .position(
                        new LatLng(location.getLatitude(), location
                                .getLongitude())).title("I'm here"));
    }

}

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    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.near, 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> {

    Double lat = locationManager.getLastKnownLocation(provider)
            .getLatitude();
    Double lng = locationManager.getLastKnownLocation(provider)
            .getLongitude();

    String URL = "http:/?xyz.around_me.json?app_id=test&lat="
            + lat + "&lng=" + lng;

    AndroidHttpClient mClient = AndroidHttpClient.newInstance("");

    @Override
    protected String doInBackground(Void... params) {

        HttpGet request = new HttpGet(URL);
        ResponseHandler<String> responseHandler = new BasicResponseHandler();

        try {

            return mClient.execute(request, responseHandler);

        } catch (ClientProtocolException exception) {
            exception.printStackTrace();
        } catch (IOException exception) {
            exception.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(String result) {

        if (null != mClient)
            mClient.close();
        Log.v("Response", result);
        // Toast.makeText(getBaseContext(), result,
        // Toast.LENGTH_SHORT).show();

        try {


            JSONArray json = new JSONArray(result);

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

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

            Log.v("LLDN", ""+lat1+"&"+lng1);

            gMap.addMarker(new MarkerOptions().title(e
                    .getString("name")).position(new LatLng(lat1, lng1)));
            }
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}

}

这是我的json回复

[
{
point: "77.606706,12.967060",
distance: "1.41",
id: 5686,
ph: "1234",
name: "zxcvb",
LS: " asdfrewrtet"
},
{
point: "77.606706,12.967060",
distance: "1.41",
id: 5686,
ph: "1234",
name: "zxcvb",
LS: " asdfrewrtet"
},
{
point: "77.606706,12.967060",
distance: "1.41",
id: 5686,
ph: "1234",
name: "zxcvb",
LS: " asdfrewrtet"
},
]

有人帮我从这个回复中提取数据。如果我提取数据，我可以放置标记。

Answer 1

您需要从JSON对象获取数据，类似于以下工作示例：

@Override
protected void onPostExecute(String result) {

  // Had to create this hard coded JSON result string to have something to test with.
  result = "[ { " +
    "\"point\":\"77.606706,12.967060\"," +
    "\"name\":\"MyMarker\"}]";

  try {
    JSONArray json = new JSONArray(result);

  for (int i = 0; i < json.length(); i++) {
    JSONObject e = json.getJSONObject(i);
    String point = e.getString("point");

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

    gMap.addMarker(new MarkerOptions().title(e.getString("name")).position(new LatLng(lat1, lng1)));
  }

  } catch (JSONException e) {
      e.printStackTrace();
  }
}

如何通过解析的json数组在地图上添加标记

1 个答案: