android GoogleMap定位（四）
根据输入的名称查询
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注：地点输入错误的时候会导致程序崩溃，暂没做处理。(可进行提示的)
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主界面：
package com.hc;import java.util.List;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 android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.RadioGroup;import android.widget.RadioGroup.OnCheckedChangeListener;import android.widget.Toast;public class AddressActivity extends MapActivity {/** Called when the activity is first created. */Button locBn;MapView mv;EditText address_value;MapController controller;Bitmap posBitmap;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.address);posBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.icon);mv = (MapView) findViewById(R.id.mv);address_value = (EditText) findViewById(R.id.address_value);// 显示放大缩小控制按钮mv.setBuiltInZoomControls(true);controller = mv.getController();locBn = (Button) findViewById(R.id.location);locBn.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {String address = address_value.getEditableText().toString().trim();if (address.equals("")) {Toast.makeText(AddressActivity.this, "输入有效地址",Toast.LENGTH_LONG).show();} else {double[] result=ConvertUtil.getLocationInfo(address);UpdateMapView(result[0], result[1]);}}});locBn.performClick();}@Overrideprotected boolean isRouteDisplayed() {// TODO Auto-generated method stubreturn true;}private void UpdateMapView(double dlong, double dLat) {GeoPoint gp = new GeoPoint((int)(dLat*1E6), (int)(dlong*1E6));mv.displayZoomControls(true);controller.animateTo(gp);List<Overlay> ol = mv.getOverlays();ol.clear();ol.add(new PosOverLay(gp, posBitmap));}}处理请求（推荐此处用service，handle来进行处理交互）package com.hc;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.json.JSONException;import org.json.JSONObject;public class ConvertUtil {public static double[] getLocationInfo(String address){HttpClient client= new DefaultHttpClient();HttpGet httpGet=new HttpGet("http://maps.google.com/maps/api/geocode/json?address="+address+"ka&sensor=false");StringBuffer sb =new StringBuffer();HttpResponse response;try {response = client.execute(httpGet);HttpEntity entity =response.getEntity();InputStream in=entity.getContent();BufferedReader reader = new BufferedReader(new InputStreamReader(in, "UTF-8"));//int len = 0; //while((len =in.read())!=-1){//sb.append((char)len);//}String line=null;while ((line = reader.readLine()) != null) { sb.append(line); }in.close();reader.close();JSONObject json = new JSONObject(sb.toString());JSONObject location = json.getJSONArray("results").getJSONObject(0).getJSONObject("geometry").getJSONObject("location");double x=location.getDouble("lng");double y = location.getDouble("lat");return new double[]{x,y};} catch (ClientProtocolException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}}??效果图
源码