尝试在谷歌地图上绘制多个地理点位置时出现此错误。我正在通过 PHP 和 JSON 从 MySQL 数据库中读取纬度和经度。我查看了主要示例,例如无法获取连接工厂客户端,无法获取连接工厂客户端 - 与 Google 地图打架,Android MapActivity:无法获取连接工厂客户端。
我可以确认它不是无效的 API 密钥,因为我生成了 2 个不同的密钥并返回了相同的错误。这也不是 API 级别的问题,我尝试在 API 级别 17 和级别 8 上运行应用程序,但仍然没有乐趣。当我运行代码时,它显示地图没有问题,然后得到我的异常 toast 消息“显示内容时出错”
这是我的 mapview.java 代码:
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.graphics.drawable.Drawable;
import android.net.ParseException;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;
public class mapview extends MapActivity
{
//protected MapView mapview;
JSONArray jarray;
String result=null;
InputStream is=null;
StringBuilder sb=null;
double LAT;
double LNG;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.mapview);
MapView mapview = (MapView) findViewById(R.id.mapview);
mapview.setBuiltInZoomControls(true);
//ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
try
{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.0.2.2/displaymarkers.php");
//httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}
catch(Exception e)
{
Log.e("log_tag", "Error in http connection"+e.toString());
}
try{
jarray = new JSONArray("$json_output[]");
JSONObject json_data = null;
for(int i = 0; i < jarray.length(); i++)
{
json_data = jarray.getJSONObject(i);
LAT=json_data.getDouble("lat");
LNG=json_data.getDouble("lng");
GeoPoint point = new GeoPoint((int)(LAT * 1E6), (int)(LNG * 1E6));
OverlayItem overlayitem = new OverlayItem(point, "TEXT", null);
List<Overlay> mapOverlays = mapview.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.marker);
myItemizedOverlay itemizedoverlay = new myItemizedOverlay(drawable, this);
MapController mapController = mapview.getController();
//mapController.animateTo(point);
mapController.setZoom(8);
itemizedoverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedoverlay);
}
}
catch(JSONException e1)
{
Toast.makeText(getBaseContext(), "Error displaying contents" ,Toast.LENGTH_LONG).show();
}
catch (ParseException e1)
{
e1.printStackTrace();
}
}
@Override
protected boolean isRouteDisplayed()
{
return false;
}
}
这是我的 ItemizedOverlay.java 代码:
import java.util.ArrayList;
import android.app.AlertDialog;
import android.content.Context;
import android.graphics.drawable.Drawable;
import com.google.android.maps.OverlayItem;
import com.google.android.maps.ItemizedOverlay;
public class myItemizedOverlay extends ItemizedOverlay
{
private ArrayList<OverlayItem> mapOverlays = new ArrayList<OverlayItem>();
private Context mContext;
public myItemizedOverlay(Drawable marker, Context context)
{
super(boundCenterBottom(marker));
mContext = context;
}
public void addOverlay(OverlayItem overlay)
{
mapOverlays.add(overlay);
this.populate();
}
@Override
protected OverlayItem createItem(int i)
{
return mapOverlays.get(i);
}
@Override
public int size()
{
return mapOverlays.size();
}
@Override
protected boolean onTap(int index)
{
OverlayItem item = mapOverlays.get(index);
AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
dialog.setTitle(item.getTitle());
dialog.setMessage(item.getSnippet());
dialog.show();
return true;
}
}
我会很感激我得到的任何帮助,在此先感谢。