6）界面的刷新显示

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以下是MainActivity中的代码，通过注释可以理解思路流程.

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1. package app.ui.activity;  
2.     import java.util.Timer;  
3.     import java.util.TimerTask;  
4.     import android.content.Intent;  
5.     import android.os.Bundle;  
6.     import android.os.Handler;  
7.     import android.os.Message;  
8.     import android.view.View;  
9.     import android.view.WindowManager;  
10.     import android.widget.Button;  
11.     import android.widget.TextView;  
12.     import android.widget.Toast;  
13.     import app.db.DistanceInfoDao;  
14.     import app.model.DistanceInfo;  
15.     import app.service.LocationService;  
16.     import app.ui.ConfirmDialog;  
17.     import app.ui.MyApplication;  
18.     import app.ui.R;  
19.     import app.utils.ConstantValues;  
20.     import app.utils.LogUtil;  
21.     import app.utils.Utils;  
22.   
23.     public class MainActivity extends Activity {  
24.           
25.         private TextView mTvDistance;                   //控件  
26.         private Button mButton;  
27.         private TextView mLng_lat;  
28.         private boolean isStart = true;                 //是否开始计算移动距离  
29.   
30.         private DistanceInfoDao mDistanceInfoDao;       //数据库  
31.         private volatile boolean isRefreshUI = true;    //是否暂停刷新UI的标识  
32.         private static final int REFRESH_TIME = 5000;   //5秒刷新一次  
33.   
34.         private Handler refreshHandler = new Handler(){ //刷新界面的Handler  
35.             public void handleMessage(Message msg) {  
36.                 switch (msg.what) {  
37.                     case ConstantValues.REFRESH_UI:  
38.                         if (isRefreshUI) {  
39.                             LogUtil.info(DistanceComputeActivity.class, "refresh ui");  
40.                             DistanceInfo mDistanceInfo = mDistanceInfoDao.getById(MyApplication.orderDealInfoId);  
41.                             LogUtil.info(DistanceComputeActivity.class, "界面刷新---> "+mDistanceInfo);  
42.                             if (mDistanceInfo != null) {  
43.                                 mTvDistance.setText(String.valueOf(Utils.getValueWith2Suffix(mDistanceInfo.getDistance())));  
44.                                 mLng_lat.setText("经:"+mDistanceInfo.getLongitude()+" 纬:"+mDistanceInfo.getLatitude());  
45.                                 mTvDistance.invalidate();  
46.                                 mLng_lat.invalidate();  
47.                             }  
48.                         }  
49.                         break;  
50.                 }  
51.                 super.handleMessage(msg);  
52.             }  
53.         };  
54.   
55.         //定时器，每5秒刷新一次UI  
56.         private Timer refreshTimer = new Timer(true);  
57.         private TimerTask refreshTask = new TimerTask() {  
58.             @Override  
59.             public void run() {  
60.                 if (isRefreshUI) {  
61.                     Message msg = refreshHandler.obtainMessage();  
62.                     msg.what = ConstantValues.REFRESH_UI;  
63.                     refreshHandler.sendMessage(msg);  
64.                 }  
65.             }  
66.         };  
67.   
68.         @Override  
69.         protected void onCreate(Bundle savedInstanceState) {  
70.             super.onCreate(savedInstanceState);  
71.             getWindow().setFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON,   
72.                 WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);    //保持屏幕常亮  
73.             setContentView(R.layout.activity_expensecompute);  
74.   
75.             startService(new Intent(this,LocationService.class));   //启动定位服务  
76.             Toast.makeText(this,"已启动定位服务...", 1).show();  
77.             init();                                                 //初始化相应控件  
78.         }  
79.   
80.         private void init(){  
81.             mTvDistance = (TextView) findViewById(R.id.tv_drive_distance);  
82.             mDistanceInfoDao = new DistanceInfoDao(this);  
83.             refreshTimer.schedule(refreshTask, 0, REFRESH_TIME);  
84.             mButton = (Button)findViewById(R.id.btn_start_drive);  
85.             mLng_lat = (TextView)findViewById(R.id.longitude_Latitude);  
86.         }  
87.   
88.   
89.         @Override  
90.         public void onClick(View v) {  
91.             super.onClick(v);  
92.             switch (v.getId()) {  
93.                 case R.id.btn_start_drive:      //计算距离按钮  
94.                     if(isStart)  
95.                     {  
96.                         mButton.setBackgroundResource(R.drawable.btn_selected);  
97.                         mButton.setText("结束计算");  
98.                         isStart = false;  
99.                         DistanceInfo mDistanceInfo = new DistanceInfo();  
100.                         mDistanceInfo.setDistance(0f);                 //距离初始值  
101.                         mDistanceInfo.setLongitude(MyApplication.lng); //经度初始值  
102.                         mDistanceInfo.setLatitude(MyApplication.lat);  //纬度初始值  
103.                         int id = mDistanceInfoDao.insertAndGet(mDistanceInfo);  //将值插入数据库，并获得数据库中最大的id  
104.                         if (id != -1) {  
105.                             MyApplication.orderDealInfoId = id;                 //将id赋值到程序全局变量中(注：该id来决定是否计算移动距离)  
106.                             Toast.makeText(this,"已开始计算...", 0).show();  
107.                         }else{  
108.                             Toast.makeText(this,"id is -1,无法执行距离计算代码块", 0).show();  
109.                         }  
110.                     }else{  
111.                         //自定义提示框  
112.                         ConfirmDialog dialog = new ConfirmDialog(this, R.style.dialogNoFrame){  
113.                             @Override  
114.                             public void setDialogContent(TextView content) {  
115.                                 content.setVisibility(View.GONE);  
116.                             }  
117.                             @Override  
118.                             public void setDialogTitle(TextView title) {  
119.                                 title.setText("确认结束计算距离 ？");  
120.                             }  
121.                             @Override  
122.                             public void startMission() {  
123.                                 mButton.setBackgroundResource(R.drawable.btn_noselect);  
124.                                 mButton.setText("开始计算");  
125.                                 isStart = true;  
126.                                 isRefreshUI = false;    //停止界面刷新  
127.                                 if (refreshTimer != null) {  
128.                                     refreshTimer.cancel();  
129.                                     refreshTimer = null;  
130.                                 }  
131.                                 mDistanceInfoDao.delete(MyApplication.orderDealInfoId); //删除id对应记录  
132.                                 MyApplication.orderDealInfoId = -1; //停止定位计算  
133.                                 Toast.makeText(DistanceComputeActivity.this,"已停止计算...", 0).show();  
134.                             }  
135.                         };  
136.                         dialog.show();  
137.                     }  
138.                     break;  
139.             }  
140.         }  
141.     }  

以下是LocationService中的代码，即配置的百度定位sdk代码块，放在继承了service的类中  LocationService.java (方便程序在后台实时更新经纬度)

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1. package app.service;  
2.     import java.util.concurrent.Callable;  
3.     import java.util.concurrent.ExecutorService;  
4.     import java.util.concurrent.Executors;  
5.     import android.app.Service;  
6.     import android.content.Intent;  
7.     import android.os.IBinder;  
8.     import app.db.DistanceInfoDao;  
9.     import app.model.GpsLocation;  
10.     import app.model.DistanceInfo;  
11.     import app.ui.MyApplication;  
12.     import app.utils.BDLocation2GpsUtil;  
13.     import app.utils.FileUtils;  
14.     import app.utils.LogUtil;  
15.     import com.baidu.location.BDLocation;  
16.     import com.baidu.location.BDLocationListener;  
17.     import com.baidu.location.LocationClient;  
18.     import com.baidu.location.LocationClientOption;  
19.     import com.computedistance.DistanceComputeInterface;  
20.     import com.computedistance.impl.DistanceComputeImpl;  
21.   
22.     public class LocationService extends Service {  
23.   
24.         public static final String FILE_NAME = "log.txt";                       //日志  
25.         LocationClient mLocClient;  
26.         private Object lock = new Object();  
27.         private volatile GpsLocation prevGpsLocation = new GpsLocation();       //定位数据  
28.         private volatile GpsLocation currentGpsLocation = new GpsLocation();  
29.         private MyLocationListenner myListener = new MyLocationListenner();  
30.         private volatile int discard = 1;   //Volatile修饰的成员变量在每次被线程访问时，都强迫从共享内存中重读该成员变量的值。  
31.         private DistanceInfoDao mDistanceInfoDao;  
32.         private ExecutorService executor = Executors.newSingleThreadExecutor();  
33.   
34.         @Override  
35.         public IBinder onBind(Intent intent) {  
36.             return null;  
37.         }  
38.   
39.         @Override  
40.         public void onCreate() {  
41.             super.onCreate();  
42.             mDistanceInfoDao = new DistanceInfoDao(this);   //初始化数据库  
43.             //LogUtil.info(LocationService.class, "Thread id ----------->:" + Thread.currentThread().getId());  
44.             mLocClient = new LocationClient(this);  
45.             mLocClient.registerLocationListener(myListener);  
46.             //定位参数设置  
47.             LocationClientOption option = new LocationClientOption();  
48.             option.setCoorType("bd09ll"); //返回的定位结果是百度经纬度，默认值gcj02  
49.             option.setAddrType("all");    //返回的定位结果包含地址信息  
50.             option.setScanSpan(5000);     //设置发起定位请求的间隔时间为5000ms  
51.             option.disableCache(true);    //禁止启用缓存定位  
52.             option.setProdName("app.ui.activity");  
53.             option.setOpenGps(true);  
54.             option.setPriority(LocationClientOption.GpsFirst);  //设置GPS优先  
55.             mLocClient.setLocOption(option);  
56.             mLocClient.start();  
57.             mLocClient.requestLocation();  
58.   
59.         }  
60.   
61.         @Override  
62.         @Deprecated  
63.         public void onStart(Intent intent, int startId) {  
64.             super.onStart(intent, startId);  
65.         }  
66.   
67.         @Override  
68.         public void onDestroy() {  
69.             super.onDestroy();  
70.             if (null != mLocClient) {  
71.                 mLocClient.stop();  
72.             }  
73.             startService(new Intent(this, LocationService.class));  
74.         }  
75.   
76.         private class Task implements Callable<String>{  
77.             private BDLocation location;  
78.             public Task(BDLocation location){  
79.                 this.location = location;  
80.             }  
81.   
82.             /** 
83.              * 检测是否在原地不动 
84.              * 
85.              * @param distance 
86.              * @return 
87.              */  
88.             private boolean noMove(float distance){  
89.                 if (distance < 0.01) {  
90.                     return true;  
91.                 }  
92.                 return false;  
93.             }  
94.   
95.             /** 
96.              * 检测是否在正确的移动 
97.              * 
98.              * @param distance 
99.              * @return 
100.              */  
101.             private boolean checkProperMove(float distance){  
102.                 if(distance <= 0.1 * discard){  
103.                     return true;  
104.                 }else{  
105.                     return false;  
106.                 }  
107.             }  
108.   
109.             /** 
110.              * 检测获取的数据是否是正常的 
111.              * 
112.              * @param location 
113.              * @return 
114.              */  
115.             private boolean checkProperLocation(BDLocation location){  
116.                 if (location != null && location.getLatitude() != 0 && location.getLongitude() != 0){  
117.                     return true;  
118.                 }  
119.                 return false;  
120.             }  
121.   
122.             @Override  
123.             public String call() throws Exception {  
124.                 synchronized (lock) {  
125.                     if (!checkProperLocation(location)){  
126.                         LogUtil.info(LocationService.class, "location data is null");  
127.                         discard++;  
128.                         return null;  
129.                     }  
130.   
131.                     if (MyApplication.orderDealInfoId != -1) {  
132.                         DistanceInfo mDistanceInfo = mDistanceInfoDao.getById(MyApplication.orderDealInfoId);   //根据MainActivity中赋值的全局id查询数据库的值  
133.                         if(mDistanceInfo != null)       //不为空则说明车已经开始行使，并可以获得经纬度，计算移动距离  
134.                         {  
135.                             LogUtil.info(LocationService.class, "行驶中......");  
136.                             GpsLocation tempGpsLocation = BDLocation2GpsUtil.convertWithBaiduAPI(location);     //位置转换  
137.                             if (tempGpsLocation != null) {  
138.                                 currentGpsLocation = tempGpsLocation;  
139.                             }else{  
140.                                 discard ++;  
141.                             }  
142.                             //日志  
143.                             String logMsg = "(plat:--->" + prevGpsLocation.lat + "  plgt:--->" + prevGpsLocation.lng +")\n" +  
144.                                             "(clat:--->" + currentGpsLocation.lat + "  clgt:--->" + currentGpsLocation.lng + ")";  
145.                             LogUtil.info(LocationService.class, logMsg);  
146.   
147.                             /** 计算距离  */  
148.                             float distance = 0.0f;  
149.                             DistanceComputeInterface distanceComputeInterface = DistanceComputeImpl.getInstance();  //计算距离类对象  
150.                             distance = (float) distanceComputeInterface.getLongDistance(prevGpsLocation.lat,prevGpsLocation.lng,  
151.                             currentGpsLocation.lat,currentGpsLocation.lng);     //移动距离计算  
152.                             if (!noMove(distance)) {                //是否在移动  
153.                                 if (checkProperMove(distance)) {    //合理的移动  
154.                                     float drivedDistance = mDistanceInfo.getDistance();  
155.                                     mDistanceInfo.setDistance(distance + drivedDistance); //拿到数据库原始距离值， 加上当前值  
156.                                     mDistanceInfo.setLongitude(currentGpsLocation.lng);   //经度  
157.                                     mDistanceInfo.setLatitude(currentGpsLocation.lat);    //纬度  
158.   
159.                                     //日志记录  
160.                                     FileUtils.saveToSDCard(FILE_NAME,"移动距离--->:"+distance+drivedDistance+"\n"+"数据库中保存的距离"+mDistanceInfo.getDistance());  
161.                                     mDistanceInfoDao.updateDistance(mDistanceInfo);  
162.                                     discard = 1;  
163.                                 }  
164.                             }  
165.                             prevGpsLocation = currentGpsLocation;  
166.                         }  
167.                     }  
168.                     return null;  
169.                 }  
170.             }  
171.         }  
172.   
173.         /** 
174.          * 定位SDK监听函数 
175.          */  
176.         public class MyLocationListenner implements BDLocationListener {  
177.             @Override  
178.             public void onReceiveLocation(BDLocation location) {  
179.                 executor.submit(new Task(location));  
180.   
181.                 LogUtil.info(LocationService.class, "经度："+location.getLongitude());  
182.                 LogUtil.info(LocationService.class, "纬度："+location.getLatitude());  
183.                 //将经纬度保存于全局变量，在MainActivity中点击按钮时初始化数据库字段  
184.                 if(MyApplication.lng <=0 && MyApplication.lat <= 0)  
185.                 {  
186.                     MyApplication.lng = location.getLongitude();  
187.                     MyApplication.lat = location.getLatitude();  
188.                 }  
189.             }  
190.   
191.             public void onReceivePoi(BDLocation poiLocation) {  
192.                 if (poiLocation == null){  
193.                     return ;  
194.                 }  
195.             }  
196.         }  
197.     }  

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1. package app.db;  
2. import android.content.Context;  
3. import android.database.sqlite.SQLiteDatabase;  
4. import android.database.sqlite.SQLiteOpenHelper;  
5.   
6. public class DBOpenHelper extends SQLiteOpenHelper{  
7.     private static final int VERSION = 1;                   //数据库版本号  
8.     private static final String DB_NAME = "distance.db";    //数据库名  
9.   
10.     public DBOpenHelper(Context context){                   //创建数据库  
11.         super(context, DB_NAME, null, VERSION);  
12.     }  
13.   
14.     @Override  
15.     public void onCreate(SQLiteDatabase db) {               //创建数据表  
16.         db.execSQL("CREATE TABLE IF NOT EXISTS milestone(id INTEGER PRIMARY KEY AUTOINCREMENT, distance INTEGER,longitude DOUBLE, latitude DOUBLE )");  
17.     }  
18.   
19.     @Override  
20.     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {  //版本号发生改变的时  
21.         db.execSQL("drop table milestone");  
22.         db.execSQL("CREATE TABLE IF NOT EXISTS milestone(id INTEGER PRIMARY KEY AUTOINCREMENT, distance INTEGER,longitude FLOAT, latitude FLOAT )");  
23.     }  
24.   
25. }  

以下是应用中需要使用的数据库业务逻辑封装类 DistanceInfoDao.java

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1. package app.db;  
2.     import android.content.Context;  
3.     import android.database.Cursor;  
4.     import android.database.sqlite.SQLiteDatabase;  
5.     import app.model.DistanceInfo;  
6.     import app.utils.LogUtil;  
7.   
8.     public class DistanceInfoDao {  
9.         private DBOpenHelper helper;  
10.         private SQLiteDatabase db;  
11.   
12.         public DistanceInfoDao(Context context) {  
13.             helper = new DBOpenHelper(context);  
14.         }  
15.   
16.         public void insert(DistanceInfo mDistanceInfo) {  
17.             if (mDistanceInfo == null) {  
18.                 return;  
19.             }  
20.             db = helper.getWritableDatabase();  
21.             String sql = "INSERT INTO milestone(distance,longitude,latitude) VALUES(‘"+ mDistanceInfo.getDistance() + "‘,‘"+ mDistanceInfo.getLongitude() + "‘,‘"+ mDistanceInfo.getLatitude() + "‘)";  
22.             LogUtil.info(DistanceInfoDao.class, sql);  
23.             db.execSQL(sql);  
24.             db.close();  
25.         }  
26.   
27.         public int getMaxId() {  
28.             db = helper.getReadableDatabase();  
29.             Cursor cursor = db.rawQuery("SELECT MAX(id) as id from milestone",null);  
30.             if (cursor.moveToFirst()) {  
31.                 return cursor.getInt(cursor.getColumnIndex("id"));  
32.             }  
33.             return -1;  
34.         }  
35.   
36.         /** 
37.          * 添加数据 
38.          * @param orderDealInfo 
39.          * @return 
40.          */  
41.         public synchronized int insertAndGet(DistanceInfo mDistanceInfo) {  
42.             int result = -1;  
43.             insert(mDistanceInfo);  
44.             result = getMaxId();  
45.             return result;  
46.         }  
47.   
48.         /** 
49.          * 根据id获取 
50.          * @param id 
51.          * @return 
52.          */  
53.         public DistanceInfo getById(int id) {  
54.             db = helper.getReadableDatabase();  
55.             Cursor cursor = db.rawQuery("SELECT * from milestone WHERE id = ?",new String[] { String.valueOf(id) });  
56.             DistanceInfo mDistanceInfo = null;  
57.             if (cursor.moveToFirst()) {  
58.                 mDistanceInfo = new DistanceInfo();  
59.                 mDistanceInfo.setId(cursor.getInt(cursor.getColumnIndex("id")));  
60.                 mDistanceInfo.setDistance(cursor.getFloat(cursor.getColumnIndex("distance")));  
61.                 mDistanceInfo.setLongitude(cursor.getFloat(cursor.getColumnIndex("longitude")));  
62.                 mDistanceInfo.setLatitude(cursor.getFloat(cursor.getColumnIndex("latitude")));  
63.             }  
64.             cursor.close();  
65.             db.close();  
66.             return mDistanceInfo;  
67.         }  
68.   
69.         /** 
70.          * 更新距离 
71.          * @param orderDealInfo 
72.          */  
73.         public void updateDistance(DistanceInfo mDistanceInfo) {  
74.             if (mDistanceInfo == null) {  
75.                 return;  
76.             }  
77.             db = helper.getWritableDatabase();  
78.             String sql = "update milestone set distance="+ mDistanceInfo.getDistance() +",longitude="+mDistanceInfo.getLongitude()+",latitude="+mDistanceInfo.getLatitude()+" where id = "+ mDistanceInfo.getId();  
79.             LogUtil.info(DistanceInfoDao.class, sql);  
80.             db.execSQL(sql);  
81.             db.close();  
82.         }  
83.     }  

以下是需要使用到的实体类 DistanceInfo.java (set数据到对应变量，以实体类作为参数更新数据库)

[java] view plaincopyprint?

1. package app.model;  
2. public class DistanceInfo {  
3.     private int id;  
4.     private float distance;  
5.     private double longitude;  
6.     private double latitude;  
7.   
8.     public int getId() {  
9.         return id;  
10.     }  
11.     public void setId(int id) {  
12.         this.id = id;  
13.     }  
14.     public float getDistance() {  
15.         return distance;  
16.     }  
17.     public void setDistance(float distance) {  
18.         this.distance = distance;  
19.     }  
20.     public double getLongitude() {  
21.   
22.         return longitude;  
23.     }  
24.     public void setLongitude(double longitude) {  
25.   
26.         this.longitude = longitude;  
27.     }  
28.     public double getLatitude() {  
29.   
30.         return latitude;  
31.     }  
32.     public void setLatitude(double latitude) {  
33.   
34.         this.latitude = latitude;  
35.     }  
36.     @Override  
37.     public String toString() {  
38.   
39.         return "DistanceInfo [id=" + id + ", distance=" + distance  
40.                 + ", longitude=" + longitude + ", latitude=" + latitude + "]";  
41.     }  
42. }  

[java] view plaincopyprint?

1. package app.model;  
2. public class GpsLocation {  
3.     public double lat;//纬度  
4.     public double lng;//经度  
5. }  

[java] view plaincopyprint?

1. package app.utils;  
2. import it.sauronsoftware.base64.Base64;  
3. import java.io.BufferedReader;  
4. import java.io.IOException;  
5. import java.io.InputStreamReader;  
6. import java.net.HttpURLConnection;  
7. import java.net.URL;  
8. import org.json.JSONObject;  
9. import app.model.GpsLocation;  
10. import com.baidu.location.BDLocation;  
11. public class BDLocation2GpsUtil {  
12.     static BDLocation tempBDLocation = new BDLocation();     // 临时变量，百度位置  
13.     static GpsLocation tempGPSLocation = new GpsLocation();  // 临时变量，gps位置  
14.     public static enum Method{  
15.         origin, correct;  
16.     }  
17.     private static final Method method = Method.correct;  
18.     /** 
19.      * 位置转换 
20.      * 
21.      * @param lBdLocation 百度位置 
22.      * @return GPS位置 
23.      */  
24.     public static GpsLocation convertWithBaiduAPI(BDLocation lBdLocation) {  
25.         switch (method) {  
26.         case origin:    //原点  
27.             GpsLocation location = new GpsLocation();  
28.             location.lat = lBdLocation.getLatitude();  
29.             location.lng = lBdLocation.getLongitude();  
30.             return location;  
31.         case correct:   //纠偏  
32.             //同一个地址不多次转换  
33.             if (tempBDLocation.getLatitude() == lBdLocation.getLatitude() && tempBDLocation.getLongitude() == lBdLocation.getLongitude()) {  
34.                 return tempGPSLocation;  
35.             }  
36.             String url = "http://api.map.baidu.com/ag/coord/convert?from=0&to=4&"  
37.                     + "x=" + lBdLocation.getLongitude() + "&y="  
38.                     + lBdLocation.getLatitude();  
39.             String result = executeHttpGet(url);  
40.             LogUtil.info(BDLocation2GpsUtil.class, "result:" + result);  
41.             if (result != null) {  
42.                 GpsLocation gpsLocation = new GpsLocation();  
43.                 try {  
44.                     JSONObject jsonObj = new JSONObject(result);  
45.                     String lngString = jsonObj.getString("x");  
46.                     String latString = jsonObj.getString("y");  
47.                     // 解码  
48.                     double lng = Double.parseDouble(new String(Base64.decode(lngString)));  
49.                     double lat = Double.parseDouble(new String(Base64.decode(latString)));  
50.                     // 换算  
51.                     gpsLocation.lng = 2 * lBdLocation.getLongitude() - lng;  
52.                     gpsLocation.lat = 2 * lBdLocation.getLatitude() - lat;  
53.                     tempGPSLocation = gpsLocation;  
54.                     LogUtil.info(BDLocation2GpsUtil.class, "result:" + gpsLocation.lat + "||" + gpsLocation.lng);  
55.                 } catch (Exception e) {  
56.                     e.printStackTrace();  
57.                     return null;  
58.                 }  
59.                 tempBDLocation = lBdLocation;  
60.                 return gpsLocation;  
61.             }else{  
62.                 LogUtil.info(BDLocation2GpsUtil.class, "百度API执行出错,url is:" + url);  
63.                 return null;  
64.             }  
65.         }  
66.     }  
67. }  

Android中计算地图上两点距离的算法

2.较快的消耗电量

源码下载地址

android中使用百度定位sdk实时的计算移动距离,布布扣,bubuko.com

android中使用百度定位sdk实时的计算移动距离