采用百度开放平台的api对自己位置的定位的好处有很多。
1，完全不需要你做任何事情。程序自动给调用。
2，稳定。流量少。之前做的有些程序是从网络上抓取自己的ip地址来进行定位。
而百度的这个，返回一些你位置的基本信息。
一下就是代码：
基础类，这个类保存个人位置信息。
package com.duduli.li;public class Addr { private String time; private String error; private String pointX; private String PointY; private String radius; private String addr; public String getTime() { return time; } public void setTime(String time) { this.time = time; } public String getPointX() { return pointX; } public void setPointX(String pointX) { this.pointX = pointX; } public String getPointY() { return PointY; } public void setPointY(String pointY) { PointY = pointY; } public String getError() { return error; } public void setError(String error) { this.error = error; } public String getRadius() { return radius; } public void setRadius(String radius) { this.radius = radius; } public String getAddr() { return addr; } public void setAddr(String addr) { this.addr = addr; }}第二个为百度返回json的解析类，将获得的信息解析到基础类中进行保存。
package com.duduli.li;import org.json.JSONException;import org.json.JSONObject;public class JsonParse { public Addr parseJson(String json) throws JSONException{ Addr addrMsg = new Addr(); JSONObject jo = new JSONObject(json);// 解析json中的result值 String result = jo.getString("result"); JSONObject resultJO = new JSONObject(result); String time = resultJO.getString("time"); String error = resultJO.getString("error"); addrMsg.setTime(time); addrMsg.setError(error); // 解析json中的content值 String content = jo.getString("content"); JSONObject contentJO = new JSONObject(content); String point = contentJO.getString("point"); // 解析json中point数据 JSONObject pointJO = new JSONObject(point); String x = pointJO.getString("x"); String y = pointJO.getString("y"); addrMsg.setPointX(x); addrMsg.setPointY(y); String radius = contentJO.getString("radius"); addrMsg.setRadius(radius); // 解析json中add数据 String addr = contentJO.getString("addr"); JSONObject addrJO = new JSONObject(addr); String detail = addrJO.getString("detail"); addrMsg.setAddr(detail); return addrMsg; }}第三个为layout的main.xml
<com.baidu.mapapi.MapView android:id="@+id/bmapsView" android:layout_width="fill_parent" android:layout_height="fill_parent" android:clickable="true" />
最后是activity。可以显示地图和定位的。
package com.duduli.li;import org.json.JSONException;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Point;import android.os.Bundle;import com.baidu.location.LocServiceMode;import com.baidu.location.LocationChangedListener;import com.baidu.location.LocationClient;import com.baidu.location.ReceiveListener;import com.baidu.mapapi.BMapManager;import com.baidu.mapapi.GeoPoint;import com.baidu.mapapi.MapActivity;import com.baidu.mapapi.MapController;import com.baidu.mapapi.MapView;import com.baidu.mapapi.Overlay;public class BaiduMapTestActivity extends MapActivity { private LocationClient lc ; private BMapManager mBMapMan; private MapView mMapView; private double x; private double y;// private GeoPoint gp; @Override protected void onCreate(Bundle arg0) { // TODO Auto-generated method stub super.onCreate(arg0); setContentView(R.layout.main); mBMapMan = new BMapManager(getApplication()); mBMapMan.init("279B8BABF0AA0A98B33A494C9E310BBB10137789", null); super.initMapActivity(mBMapMan); lc = new LocationClient(this); lc.setCoorType("gcj02"); lc.setServiceMode(LocServiceMode.Background); lc.addLocationChangedlistener(new MyLocationChangedListener()); lc.addRecerveListener(new MyReceiveListenner()); lc.start(); try { Thread.sleep(3000); } catch (InterruptedException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } lc.getLocation(); } @Override protected boolean isRouteDisplayed() { // TODO Auto-generated method stub return false; } public class MyLocationChangedListener implements LocationChangedListener { public void onLocationChanged() { //在此添加，位置改变触发的功能。// tv.append(text) } } public class MyReceiveListenner implements ReceiveListener{ public void onReceive(String strData) { //在此处理 获取到的定位结果的json串。 try { JsonParse jp = new JsonParse(); Addr ad = jp.parseJson(strData);// x = getPoint(ad.getPointX());//114.105// y = getPoint(ad.getPointY());//22.54 x = Double.valueOf(ad.getPointX()); y = Double.valueOf(ad.getPointY()); mMapView = (MapView) findViewById(R.id.bmapsView); mMapView.setBuiltInZoomControls(true); mMapView.getOverlays().add(new MyOverlay()); MapController mc = mMapView.getController(); GeoPoint gp = new GeoPoint((int)(y*1E6),(int)(x*1E6));// GeoPoint gp = new GeoPoint((int)(22.54762429*1E6),(int)(114.1054699*1E6)); mc.setCenter(gp); mc.setZoom(12); mBMapMan.start(); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /* public int getPoint(String s){ String str = s.substring(0, s.indexOf("."))+s.substring(s.indexOf(".")+1, s.indexOf(".")+7); return Integer.valueOf(str); }*/ } public class MyOverlay extends Overlay { GeoPoint geoPoint = new GeoPoint((int)(y*1E6),(int)(x*1E6)); Paint paint = new Paint(); @Override public void draw(Canvas canvas, MapView mapView, boolean shadow) { Point point = mMapView.getProjection().toPixels(geoPoint, null); Bitmap bmp = BitmapFactory.decodeResource(getResources(),android.R.drawable.presence_online); canvas.drawBitmap(bmp,point.x, point.y,paint); canvas.drawText("你在这里", point.x, point.y, paint); } }}最后还有权限：
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission> <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission> <uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission> <uses-permission android:name="android.permission.INTERNET"></uses-permission> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission>