Android中GPS定位获取坐标信息

package org.lxh.demo; import java.io.InputStream; import java.net.URL; import java.util.HashMap; import java.util.Map; import java.util.Scanner; import org.json.JSONArray; import org.json.JSONObject; import android.app.Activity; import android.app.ProgressDialog; import android.os.AsyncTask; import android.os.Bundle; 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 MyGeocodeDemo extends Activity { private EditText lng = null; private EditText lat = null; private Button search = null; private TextView result = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); super.setContentView(R.layout.main); this.lng = (EditText) super.findViewById(R.id.lng); this.lat = (EditText) super.findViewById(R.id.lat); this.search = (Button) super.findViewById(R.id.search); this.result = (TextView) super.findViewById(R.id.result); this.search.setOnClickListener(new SearchOnClickListenerImpl()); } private class SearchOnClickListenerImpl implements OnClickListener { @Override public void onClick(View v) { double latitude = Double.parseDouble(MyGeocodeDemo.this.lat .getText().toString()); double longitude = Double.parseDouble(MyGeocodeDemo.this.lng .getText().toString()); MyGeocodeDemo.this.result.setText("请稍等，信息正在检索中..."); new SearchAsyncTask(latitude, longitude).execute(0); } } // 此时要根据异步处理的工具类来向Google上进行数据的提交操作，而后通过返回的JSON数据解析出具体的数据内容 private class SearchAsyncTask extends AsyncTask<Integer, String, Integer> { ProgressDialog proDia = ProgressDialog.show(MyGeocodeDemo.this, "正在定位", "请耐心等待..."); private double latitude; private double longitude; public SearchAsyncTask(double latitude, double longitude) { this.latitude = latitude; this.longitude = longitude; } @Override protected void onProgressUpdate(String... values) { proDia.dismiss(); MyGeocodeDemo.this.result.setText(values[0]); } @Override protected Integer doInBackground(Integer... arg0) { proDia.show(); Map<String, String> map = null; try { map = this.parseJson(this.latitude, this.longitude); } catch (Exception e) { e.printStackTrace(); } if ("OK".equals(map.get("status"))) { // 操作正常 this.publishProgress(map.get("address")); // 将address数据返回 } else { this.publishProgress("没有查询结果！"); } return null; } private Map<String, String> parseJson(double latitude, double longitude) throws Exception { Map<String, String> allMap = new HashMap<String, String>(); StringBuffer buf = new StringBuffer(); InputStream input = null; try { URL url = new URL( "http://maps.google.com/maps/api/geocode/json?latlng=" + this.latitude + "," + this.longitude + "&language=zh_CN&sensor=false"); input = url.openStream(); Scanner scan = new Scanner(input); while (scan.hasNext()) { buf.append(scan.next()); // 所有的数据都保存在字符串里面 } } catch (Exception e) { e.printStackTrace(); throw e; } finally { input.close(); } JSONObject allData = new JSONObject(buf.toString()); Log.i("json:", buf.toString()); allMap.put("status", allData.getString("status")); JSONArray jsonArr = allData.getJSONArray("results"); JSONObject jsonObj = jsonArr.getJSONObject(0); allMap.put("address", jsonObj.getString("formatted_address")); return allMap; } } }