从Android中获取经度和经度的城市名称使服务不可用Android 4.0.3？

我在应用程序中使用Android 4.0.3版本.现在我想从LATITUDE和LONGITUDE获取城市名称或其他信息
但是当我运行应用程序时,显示我的服务不可用.

logcat的

  01-10 13:58:29.279: W/System.err(1211): java.io.IOException: Service not Available
    01-10 13:58:29.289: W/System.err(1211):     at android.location.Geocoder.getFromLocation(Geocoder.java:136)
    01-10 13:58:29.299: W/System.err(1211):     at com.example.vixxa.VisitorActivity$CityAsyncTask.doInBackground(VisitorActivity.java:601)
    01-10 13:58:29.319: W/System.err(1211):     at com.example.vixxa.VisitorActivity$CityAsyncTask.doInBackground(VisitorActivity.java:1)
    01-10 13:58:29.329: W/System.err(1211):     at android.os.AsyncTask$2.call(AsyncTask.java:264)
    01-10 13:58:29.329: W/System.err(1211):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
    01-10 13:58:29.339: W/System.err(1211):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
    01-10 13:58:29.349: W/System.err(1211):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
    01-10 13:58:29.349: W/System.err(1211):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
    01-10 13:58:29.359: W/System.err(1211):     at java.lang.Thread.run(Thread.java:856)

CodeAsynctak.java

public class CityAsyncTask extends AsyncTask<String , String,String>
    {

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

             Geocoder geocoder = new Geocoder(VisitorActivity.this, Locale.getDefault());
                try
                {
                    List<Address> addresses = geocoder.getFromLocation(latitude, longitude, 1);
                    Log.e("Addresses","-->"+addresses);

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

                }

            return null;
        }

    }

解决方法:

尝试使用此代码,它适用于我的TAB2.

public class CityAsyncTask extends AsyncTask<String , String,String>
{

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

         Geocoder geocoder = new Geocoder(LatLongActivity.this, Locale.getDefault());
            try
            {
                List<Address> addresses = geocoder.getFromLocation(latitude, longitude, 1);
                Log.e("Addresses","-->"+addresses);
                result = addresses.get(0).toString();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
        return result;
    }
    @Override
    protected void onPostExecute(String result) {
        // TODO Auto-generated method stub
        super.onPostExecute(result);
        AlertDialog.Builder alert = new AlertDialog.Builder(LatLongActivity.this);
        alert.setTitle("ADDRESS");
        alert.setMessage(result);
        alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener(){
            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                dialog.dismiss();
            }
        });
        alert.setCancelable(false);
        alert.show();
    }
}