一部分：几种定位简述
2.与MainActivity对应的布局
3.AndroidManifest.xml
2.
1.gps定位：
优点：最简单的手机定位方式当然是通过GPS模块（现在大部分的智能机应该都有了）。GPS方式准确度是最高的
缺点1.比较耗电；
2.绝大部分用户默认不开启GPS模块；
3.从GPS模块启动到获取第一次定位数据，可能需要比较长的时间；
4.室内几乎无法使用。
这其中，缺点2,3都是比较致命的。需要指出的是，GPS走的是卫星通信的通道，在没有网络连接的情况下也能用。
有网络、室内不可用、定位时间长、位置精确
2.基站定位
大致思路就是采集到手机上的基站ID号（cellid）和其它的一些信息（MNC，MCC，LAC等等），然后通过网络访问一些定位服务，获取 并返回对应的经纬度坐标。基站定位的精确度不如GPS，好处是能够在室内用，只要网络通畅就行。
有网络 室内可用 定位方式不精确
3.WIFI定位
和基站定位类似，这种方式是通过获取当前所用的wifi的一些信息，然后访问网络上的定位服务以获得经纬度坐标。因为它和基站定位其实都需要使 用网络，所以在Android也统称为Network方式。
与基站定位类似
4.AGPS定位
最后需要解释一点的是AGPS方式。很多人将它和基站定位混为一谈，但其实AGPS的本质仍然是GPS，只是它会使用基站信息对获取GPS进行辅助，然后 还能对获取到的GPS结果进行修正，所以AGPS要比传统的GPS更快，准确度略高。
最后需要解释一点的是AGPS方式。很多人将它和基站定位混为一谈，但其实AGPS的本质仍然是GPS，只是它会使用基站信息对获取GPS进行辅助，然后 还能对获取到的GPS结果进行修正，所以AGPS要比传统的GPS更快，准确度略高。
有网络、类似gps定位、但比传统Gps定位更快，准确度略高
第二部分：
locationManager.getLastKnownLocation()总是会出现取不到数据的情况，所以这里没有使用这个方法，避免 了取不到数据的问题
第三部分：使用异步加载，提高性能
================================代码===========================
1.Activity
package com.example.gpsdemo;
import com.example.gpsdemo.util.GetLocation;
import com.example.gpsdemo.util.LMLocation;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
LMLocation lmLocation;
TextView textView;
public MainActivity instance;
private AlertDialog dialog;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = (TextView) findViewById(R.id.textView2);
instance = this;
dialog = new ProgressDialog(MainActivity.this);
dialog.setTitle("请稍等...");
dialog.setMessage("正在定位...");
Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new GetLocation(dialog, textView, instance).DisplayLocation();
}
});
}
}
2.与MainActivity对应的布局
<xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:padding="@dimen/padding_medium"
android:text="@string/hello_world"
tools:context=".MainActivity" />
<android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignRight="@+id/textView2"
android:layout_marginRight="52dp"
android:text="定位" />
3.AndroidManifest.xml
- package="com.example.gpsdemo"
- android:versionCode="1"
- android:versionName="1.0" >
- <uses-sdk< li="">
- android:minSdkVersion="8"
- android:targetSdkVersion="15" />
- <application< li="">
- android:icon="@drawable/ic_launcher"
- android:label="@string/app_name"
- android:theme="@style/AppTheme" >
- <activity< li="">
- android:name=".MainActivity"
- android:label="@string/title_activity_main" >
package com.example.gpsdemo.util;
import android.app.AlertDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.TextView;
public class GetLocation {
AlertDialog dialog;
TextView textView;
Context context;
public GetLocation(AlertDialog dialog, TextView textView, Context context) {
this.dialog = dialog;
this.textView = textView;
this.context = context;
}
public void DisplayLocation() {
new AsyncTask() {
@Override
protected String doInBackground=\'#\'"
LMLocation location = null;
try {
location = new GPSLocation().getGPSInfo(context);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (location == null)
return null;
Log.d("debug", location.toString());
return location.toString();
}
@Override
protected void onPreExecute() {
dialog.show();
super.onPreExecute();
}
@Override
protected void onPostExecute(String result) {
if (result == null) {
textView.setText("定位失败了...");
} else {
textView.setText(result);
}
dialog.dismiss();
super.onPostExecute(result);
}
}.execute();
}
}
2.
package com.example.gpsdemo.util;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.params.ConnRouteParams;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.json.JSONArray;
import org.json.JSONObject;
import android.content.Context;
import android.database.Cursor;
import android.net.ConnectivityManager;
import android.net.NetworkInfo.State;
import android.net.Uri;
import android.net.wifi.WifiManager;
import android.telephony.TelephonyManager;
import android.telephony.gsm.GsmCellLocation;
import android.util.Log;
/**
* ******************************************
* 描述::GPS信息获取
* @version 2.0
********************************************
*/
public class GPSLocation {
private static int postType = -1;
public static final int DO_3G = 0;
public static final int DO_WIFI = 1;
public static final int NO_CONNECTION = 2;
/**
* 网络方式检查
*/
private static int netCheck(Context context) {
ConnectivityManager conMan = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
State mobile = conMan.getNetworkInfo(ConnectivityManager.TYPE_MOBILE)
.getState();
State wifi = conMan.getNetworkInfo(ConnectivityManager.TYPE_WIFI)
.getState();
if (wifi.equals(State.CONNECTED)) {
return DO_WIFI;
} else if (mobile.equals(State.CONNECTED)) {
return DO_3G;
} else {
return NO_CONNECTION;
}
}
/**
* 获取WifiManager获取信息
*/
private static JSONObject getInfoByWifiManager(Context context)
throws Exception {
JSONObject holder = new JSONObject();
holder.put("version", "1.1.0");
holder.put("host", "maps.google.com");
holder.put("address_language", "zh_CN");
holder.put("request_address", true);
WifiManager wifiManager = (WifiManager) context
.getSystemService(Context.WIFI_SERVICE);
if (wifiManager.getConnectionInfo().getBSSID() == null) {
throw new RuntimeException("bssid is null");
}
JSONArray array = new JSONArray();
JSONObject data = new JSONObject();
data.put("mac_address", wifiManager.getConnectionInfo().getBSSID());
data.put("signal_strength", 8);
data.put("age", 0);
array.put(data);
holder.put("wifi_towers", array);
return holder;
}
/**
* 获取TelephoneManager获取信息
*/
private static JSONObject getInfoByTelephoneManager(Context context)
throws Exception {
JSONObject holder = new JSONObject();
holder.put("version", "1.1.0");
holder.put("host", "maps.google.com");
holder.put("address_language", "zh_CN");
holder.put("request_address", true);
TelephonyManager tm = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
GsmCellLocation gcl = (GsmCellLocation) tm.getCellLocation();
int cid = gcl.getCid();
int lac = gcl.getLac();
int mcc = Integer.valueOf(tm.getNetworkOperator().substring(0, 3));
int mnc = Integer.valueOf(tm.getNetworkOperator().substring(3, 5));
JSONArray array = new JSONArray();
JSONObject data = new JSONObject();
data.put("cell_id", cid);
data.put("location_area_code", lac);
data.put("mobile_country_code", mcc);
data.put("mobile_network_code", mnc);
array.put(data);
holder.put("cell_towers", array);
return holder;
}
/**
* 通过wifi获取GPS信息
*/
private static HttpResponse connectionForGPS(Context context)
throws Exception {
HttpResponse httpResponse = null;
postType = netCheck(context);
if (postType == NO_CONNECTION) {
return null;
} else {
if (postType == DO_WIFI) {
if ((httpResponse = doOrdinary(context,
getInfoByWifiManager(context))) != null) {
return httpResponse;
} else if ((httpResponse = doAPN(context,
getInfoByWifiManager(context))) != null) {
return httpResponse;
} else if ((httpResponse = doOrdinary(context,
getInfoByTelephoneManager(context))) != null) {
return httpResponse;
} else if ((httpResponse = doAPN(context,
getInfoByTelephoneManager(context))) != null) {
return httpResponse;
}
}
if (postType == DO_3G) {
if ((httpResponse = doOrdinary(context,
getInfoByTelephoneManager(context))) != null) {
return httpResponse;
} else if ((httpResponse = doAPN(context,
getInfoByTelephoneManager(context))) != null) {
return httpResponse;
}
}
return null;
}
}
/**
* 通过普通方式定位
*/
private static HttpResponse doOrdinary(Context context, JSONObject holder) {
HttpResponse response = null;
try {
HttpClient httpClient = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(httpClient.getParams(),
20 * 1000);
HttpConnectionParams
.setSoTimeout(httpClient.getParams(), 20 * 1000);
HttpPost post = new HttpPost("http://74.125.71.147/loc/json");
StringEntity se = new StringEntity(holder.toString());
post.setEntity(se);
response = httpClient.execute(post);
} catch (Exception e) {
e.printStackTrace();
return null;
}
return response;
}
/**
* 通过基站定位
*/
private static HttpResponse doAPN(Context context, JSONObject holder) {
HttpResponse response = null;
try {
HttpClient httpClient = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(httpClient.getParams(),
20 * 1000);
HttpConnectionParams
.setSoTimeout(httpClient.getParams(), 20 * 1000);
HttpPost post = new HttpPost("http://74.125.71.147/loc/json");
// 设置代理
Uri uri = Uri.parse("content://telephony/carriers/preferapn"); // 获取当前正在使用的APN接入点
Cursor mCursor = context.getContentResolver().query(uri, null,
null, null, null);
if (mCursor != null) {
if (mCursor.moveToFirst()) {
String proxyStr = mCursor.getString(mCursor
.getColumnIndex("proxy"));
if (proxyStr != null && proxyStr.trim().length() > 0) {
HttpHost proxy = new HttpHost(proxyStr, 80);
httpClient.getParams().setParameter(
ConnRouteParams.DEFAULT_PROXY, proxy);
}
}
}
StringEntity se = new StringEntity(holder.toString());
post.setEntity(se);
response = httpClient.execute(post);
} catch (Exception e) {
e.printStackTrace();
return null;
}
return response;
}
/**
* GPS信息解析
*/
public static LMLocation getGPSInfo(Context context) throws Exception {
HttpResponse response = connectionForGPS(context);
if (response == null) {
Log.d("GPSLocation", "response == null");
return null;
}
LMLocation location = null;
if (response.getStatusLine().getStatusCode() == 200) {
location = new LMLocation();
HttpEntity entity = response.getEntity();
BufferedReader br;
try {
br = new BufferedReader(new InputStreamReader(
entity.getContent()));
StringBuffer sb = new StringBuffer();
String result = br.readLine();
while (result != null) {
sb.append(result);
result = br.readLine();
}
JSONObject json = new JSONObject(sb.toString());
JSONObject lca = json.getJSONObject("location");
location.setAccess_token(json.getString("access_token"));
if (lca != null) {
if (lca.has("accuracy"))
location.setAccuracy(lca.getString("accuracy"));
if (lca.has("longitude"))
location.setLatitude(lca.getDouble("longitude"));
if (lca.has("latitude"))
location.setLongitude(lca.getDouble("latitude"));
if (lca.has("address")) {
JSONObject address = lca.getJSONObject("address");
if (address != null) {
if (address.has("region"))
location.setRegion(address.getString("region"));
if (address.has("street_number"))
location.setStreet_number(address
.getString("street_number"));
if (address.has("country_code"))
location.setCountry_code(address
.getString("country_code"));
if (address.has("street"))
location.setStreet(address.getString("street"));
if (address.has("city"))
location.setCity(address.getString("city"));
if (address.has("country"))
location.setCountry(address
.getString("country"));
}
}
}
} catch (Exception e) {
e.printStackTrace();
location = null;
}
}
return location;
}
}
）
