简单实现安卓里百度地图持续定位

package com.example.andoridloca;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.method.ScrollingMovementMethod;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.baidu.location.BDLocation;
import com.baidu.location.BDLocationListener;
import com.baidu.location.LocationClient;
import com.baidu.location.LocationClientOption;
import com.baidu.location.BDNotifyListener;//假如用到位置提醒功能，需要import该类
import com.baidu.location.LocationClientOption.LocationMode;
import com.baidu.location.Poi;
import com.baidu.mapapi.SDKInitializer;
import com.baidu.mapapi.map.MapView;
public class MainActivity extends Activity implements OnClickListener{
 MapView mMapView = null; 
 public static final String TAG="mian";
 StringBuffer sb = new StringBuffer(256);
 public StringBuilder builder=new StringBuilder();
 private Button bt1;
 private TextView tv1;
 private DBtools DBhelper;
 boolean isOpenLocation=false;
 public LocationClient mLocationClient = null;
 public BDLocationListener myListener = new MyLocationListener();
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  SDKInitializer.initialize(getApplicationContext()); 
  setContentView(R.layout.activity_main);
  DBhelper = new DBtools(this); 
  tv1=(TextView) findViewById(R.id.textView1);
  tv1.setMovementMethod(new ScrollingMovementMethod());
  bt1=(Button) findViewById(R.id.button1);
  bt1.setOnClickListener(this);
  mMapView = (MapView) findViewById(R.id.bmapView); 
  mLocationClient = new LocationClient(getApplicationContext());  //声明LocationClient类
  mLocationClient.registerLocationListener( myListener ); //注册监听函数
  initLocation();
 }
 private void initLocation(){
  LocationClientOption option = new LocationClientOption();
  option.setLocationMode(LocationMode.Hight_Accuracy
);//可选，默认高精度，设置定位模式，高精度，低功耗，仅设备
  option.setCoorType("bd09ll");//可选，默认gcj02，设置返回的定位结果坐标系
  int span=0;
  option.setScanSpan(span);//可选，默认0，即仅定位一次，设置发起定位请求的间隔需要大于等于1000ms才是有效的
  option.setIsNeedAddress(true);//可选，设置是否需要地址信息，默认不需要
  option.setOpenGps(true);//可选，默认false,设置是否使用gps
  option.setLocationNotify(true);//可选，默认false，设置是否当gps有效时按照1S1次频率输出GPS结果
  option.setIsNeedLocationDescribe(true);//可选，默认false，设置是否需要位置语义化结果，可以在BDLocation.getLocationDescribe里得到，结果类似于“在北京天安门附近”
  option.setIsNeedLocationPoiList(true);//可选，默认false，设置是否需要POI结果，可以在BDLocation.getPoiList里得到
  option.setIgnoreKillProcess(false);//可选，默认true，定位SDK内部是一个SERVICE，并放到了独立进程，设置是否在stop的时候杀死这个进程，默认不杀死 
  option.SetIgnoreCacheException(false);//可选，默认false，设置是否收集CRASH信息，默认收集
  option.setEnableSimulateGps(false);//可选，默认false，设置是否需要过滤gps仿真结果，默认需要
  mLocationClient.setLocOption(option);
 }
 @Override 
 protected void onDestroy() { 
  super.onDestroy(); 
  //在activity执行onDestroy时执行mMapView.onDestroy()，实现地图生命周期管理 
  mMapView.onDestroy(); 
 } 
 @Override 
 protected void onResume() { 
  super.onResume(); 
  //在activity执行onResume时执行mMapView. onResume ()，实现地图生命周期管理 
  mMapView.onResume(); 
  } 
 @Override 
 protected void onPause() { 
  super.onPause(); 
  //在activity执行onPause时执行mMapView. onPause ()，实现地图生命周期管理 
  mMapView.onPause(); 
  } 
 public class MyLocationListener implements BDLocationListener {
  @Override
  public void onReceiveLocation(BDLocation location) {
   //Receive Location
   StringBuffer sb = new StringBuffer(256);
   sb.append("time : ");
   sb.append(location.getTime());
   sb.append("\nerror code : ");
   sb.append(location.getLocType());
   sb.append("\nlatitude : ");
   sb.append(location.getLatitude());
   sb.append("\nlontitude : ");
   sb.append(location.getLongitude());
   sb.append("\nradius : ");
   sb.append(location.getRadius());
   if (location.getLocType() == BDLocation.TypeGpsLocation){// GPS定位结果
    sb.append("\nspeed : ");
    sb.append(location.getSpeed());// 单位：公里每小时
    sb.append("\nsatellite : ");
    sb.append(location.getSatelliteNumber());
    sb.append("\nheight : ");
    sb.append(location.getAltitude());// 单位：米
    sb.append("\ndirection : ");
    sb.append(location.getDirection());// 单位度
    sb.append("\naddr : ");
    sb.append(location.getAddrStr());
    sb.append("\ndescribe : ");
    sb.append("gps定位成功");
   } else if (location.getLocType() == BDLocation.TypeNetWorkLocation){// 网络定位结果
    sb.append("\naddr : ");
    sb.append(location.getAddrStr());
    //运营商信息
    sb.append("\noperationers : ");
    sb.append(location.getOperators());
    sb.append("\ndescribe : ");
    sb.append("网络定位成功");
   } else if (location.getLocType() == BDLocation.TypeOffLineLocation) {// 离线定位结果
    sb.append("\ndescribe : ");
    sb.append("离线定位成功，离线定位结果也是有效的");
   } else if (location.getLocType() == BDLocation.TypeServerError) {
    sb.append("\ndescribe : ");
    sb.append("服务端网络定位失败，可以反馈IMEI号和大体定位时间到loc-bugs@baidu.com，会有人追查原因");
   } else if (location.getLocType() == BDLocation.TypeNetWorkException) {
    sb.append("\ndescribe : ");
    sb.append("网络不同导致定位失败，请检查网络是否通畅");
   } else if (location.getLocType() == BDLocation.TypeCriteriaException) {
    sb.append("\ndescribe : ");
    sb.append("无法获取有效定位依据导致定位失败，一般是由于手机的原因，处于飞行模式下一般会造成这种结果，可以试着重启手机");
   }
    sb.append("\nlocationdescribe : ");
    sb.append(location.getLocationDescribe());// 位置语义化信息
    List<Poi> list = location.getPoiList();// POI数据
    if (list != null) {
     sb.append("\npoilist size = : ");
     sb.append(list.size());
     for (Poi p : list) {
     sb.append("\npoi= : ");
     sb.append(p.getId() + " " + p.getName() + " " + p.getRank());
     }
    }
   Log.i("BaiduLocationApiDem", sb.toString());
   DBtools dbhelper=new DBtools(getApplicationContext());
   ContentValues initialValues = new ContentValues();
   initialValues.put("shijian",location.getTime());
   initialValues.put("didian",location.getLatitude()+"--"+location.getLongitude());
   dbhelper.open();
   dbhelper.insert("path",initialValues);
   dbhelper.close();
   tv1.setText(sb.toString()); 
  }
 }
 @Override
 public void onClick(View arg0) {
  Thread mytime=new Thread(new ThreadShow());
   if(isOpenLocation){
    mLocationClient.stop();
    isOpenLocation=false; 
   }
   else{
    Toast.makeText(getApplicationContext(), "开启", Toast.LENGTH_SHORT).show();  
    isOpenLocation=true;
    //mLocationClient.start();
    mytime.start(); 
   }
  }
 // handler类接收数据 
 Handler handler = new Handler() { 
  public void handleMessage(Message msg) { 
   if (msg.what == 1) { 
    Log.i("BaiduLocationApiDem", "加以");
    mLocationClient.start();
    mLocationClient.requestLocation(); 
   } 
  }; 
 }; 
  // 线程类 
 class ThreadShow implements Runnable { 
   @Override 
  public void run() { 
   // TODO Auto-generated method stub 
   while (isOpenLocation) { 
    try { 
     mLocationClient.stop();
     Thread.sleep(2000); 
     Message msg = new Message(); 
     msg.what = 1; 
     handler.sendMessage(msg); 
     // System.out.println("send..."); 
    } catch (Exception e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
     System.out.println("thread error..."); 
    } 
   } 
  } 
 } 
 }

//某段代码如果是这样的话按照逻辑韩式会将mLocationClient所属类的里面逻辑代码执行一遍，具体见MainAvtivity里面的MyLocationListener类内容，但是实际上是不会执行的
mLocationClient.start();
mLocationClient.stop();

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 tools:context="com.example.newloca.MainActivity" >
<RelativeLayout 
 android:layout_width="match_parent"
 android:layout_height="300dp">
 <com.baidu.mapapi.map.MapView 
 android:id="@+id/bmapView" 
 android:layout_width="fill_parent" 
 android:layout_height="fill_parent" 
 android:clickable="true" />
</RelativeLayout>
 <TextView
  android:id="@+id/textView1"
  android:layout_width="match_parent"
  android:layout_height="150dp"
  android:scrollbars="vertical"
  android:background="#f00"
  android:text="位置信息" />
 <RelativeLayout
  android:layout_width="match_parent"
  android:layout_height="match_parent"
   >
  <Button
   android:id="@+id/button1"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_alignParentRight="true"
   android:layout_alignParentBottom="true"
   android:text="获取位置" />
 </RelativeLayout>
</LinearLayout>