Question

我使用手机上的代码来获取地址{country，street，city}，但它对许多输入没有用，为什么？有时崩溃。如何通过将经度和纬度传递给一个方法来获取完整地址，该方法将所有可用地址返回到此经度和纬度。能不能给我答案才能得到最好的结果。帮助我。

 import java.io.IOException;
import java.util.List;
import java.util.Locale;
import android.app.Activity;
import android.content.Context;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener; 
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Get_Location_Name extends Activity implements OnClickListener {
private EditText ET1;
private EditText ET2;
private TextView TV1;
private Button B1;
static String result ="";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);    
    setContentView(R.layout.location_name);
    ET1=(EditText)this.findViewById(R.id.ET1_location_name);
    ET2=(EditText)this.findViewById(R.id.ET2_location_name);
    TV1=(TextView)this.findViewById(R.id.TV1_Location_name);
    B1=(Button)this.findViewById(R.id.B1_Location_name);
    B1.setOnClickListener(this);
}

@Override
public void onClick(View arg0) {

    String s=null;
    if(!ET1.getText().toString().isEmpty() && !ET2.getText().toString().isEmpty())
    {
            if(this.isOnline())
            {

                for(int i=0;i<=10;i++)
                {
                    s=getAddressFromLocation(Double.parseDouble(ET2.getText().toString()),
                    Double.parseDouble(ET1.getText().toString()),this);
                }
            if(s!=null)
                {
                Log.d("ssss","s"+s);
                TV1.setText(s);
                }
            else
                TV1.setText("s is null");
            }
            else
                TV1.setText("no internet connection");

    }
    else
        TV1.setText("Enter the Lat. and Lon.");



}

public boolean isOnline() {
   // code to check connectivity // it works fine(no problems)
}

这是我要修改的方法

public static String getAddressFromLocation(final double lon,final double lat, final Context context) 
{

      Thread thread = new Thread() {
   @Override public void run() 
    {

       Geocoder geocoder = new Geocoder(context, Locale.getDefault());   

       try {
           List<Address> list = geocoder.getFromLocation(
                   lat, lon, 1);
           if (list != null && list.size() > 0) 
               {
               Address address = list.get(0);
               result = " "+address.getAddressLine(0) + ", " + address.getLocality()+","+address.getCountryName();
                   }
           } 
        catch (IOException e)
           {
           Log.e("fafvsafagag", "Impossible to connect to Geocoder", e);
           } 
    }
 };
 thread.start();
 return result;
  }

  }

请回答我的问题。

Answer 1

有一个已知问题，即Geocoder 始终返回值。请参阅Geocoder doesn't always return a value和geocoder.getFromLocationName returns only null。您可以尝试在for循环中发送3次请求。它应该能够至少返回一次。如果没有，那么它们可能是连接问题，或者可能是服务器没有回复您的请求等其他问题。对我来说，即使它连接到互联网，有时也从未返回任何内容。然后，我使用this更可靠的方式每次获取地址：

//lat, lng are Double variables  containing latitude and longitude values. 
public JSONObject getLocationInfo() {
        //Http Request
        HttpGet httpGet = new HttpGet("http://maps.google.com/maps/api/geocode/json?latlng="+lat+","+lng+"&sensor=true");
        HttpClient client = new DefaultHttpClient();
        HttpResponse response;
        StringBuilder stringBuilder = new StringBuilder();

        try {
            response = client.execute(httpGet);
            HttpEntity entity = response.getEntity();
            InputStream stream = entity.getContent();
            int b;
            while ((b = stream.read()) != -1) {
                stringBuilder.append((char) b);
            }
        } catch (ClientProtocolException e) {
            } catch (IOException e) {
        }
                //Create a JSON from the String that was return.
        JSONObject jsonObject = new JSONObject();
        try {
            jsonObject = new JSONObject(stringBuilder.toString());
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return jsonObject;
    }

我调用了以下函数来获取完整的地址：

JSONObject ret = getLocationInfo(); //Get the JSON that is returned from the API call
JSONObject location;
String location_string;
//Parse to get the value corresponding to `formatted_address` key. 
try {
    location = ret.getJSONArray("results").getJSONObject(0);
    location_string = location.getString("formatted_address");
    Log.d("test", "formattted address:" + location_string);
} catch (JSONException e1) {
    e1.printStackTrace();

}

你可以在AsyncTask或新线程中调用它。我使用了Asynctask。希望这会有所帮助。这对我有用。如果使用纬度和经度坐标替换URL，并在Web浏览器中查看返回的JSON对象。你会看到刚刚发生的事情。

如何通过纬度和纬度获得完整的地址？

1 个答案: