实现的功能:先获取本地的经纬度,再根据经纬度,请求googleapis来解析地理位置名称。
下面的例子,能够跑起来,亲测。
多说无益,看码。
首先搞一个布局,其实就是一个textView,一个button,点击button后,在textview展示地理位置信息。
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <TextView android:id="@+id/tv_location_show" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /> <Button android:id="@+id/btn_show_location" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="获取当前位置" > </Button> </RelativeLayout>
为了方便,我直接把获取地理位置、经纬度解析,都放到MainActivity里面了。(其实就是懒,这样不好,还是该做什么的类去做什么,应该分开放的)
package com.example.getlocation;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.Manifest;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.support.v4.app.ActivityCompat;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
private LocationManager locationManager;// 位置服务
private Location location;// 位置
private Button btn_show;// 按钮
private TextView tv_show;// 展示地理位置
public static final int SHOW_LOCATION = 0;
private String lastKnowLoc;
//监听地理位置变化,地理位置变化时,能够重置location
LocationListener locationListener = new LocationListener() {
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
tv_show.setText("更新失败失败");
}
@Override
public void onLocationChanged(Location loc) {
if (loc != null) {
location = loc;
showLocation(location);
}
}
};
//这个不用说了,主要是初始化页面控件,并且设置按钮监听
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();// 关联控件,初始化按钮、展示框
tv_show.setText("地理位置");// 设置默认的位置展示,也就是没有点击按钮时的展示
lastKnowLoc = "中国";
// 点击按钮时去初始化一次当前位置
btn_show.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
locationInit();// 调用位置初始化方法
}
});
}
//这个就是地理位置初始化,主要通过调用其他方法获取经纬度,并设置到location
public void locationInit() {
try {
// 获取系统服务
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// 判断GPS是否可以获取地理位置,如果可以,展示位置,
// 如果GPS不行,再判断network,还是获取不到,那就报错
if (locationInitByGPS() || locationInitByNETWORK()) {
// 上面两个只是获取经纬度的,获取经纬度location后,再去调用谷歌解析来获取地理位置名称
showLocation(location);
} else {
tv_show.setText("获取地理位置失败,上次的地理位置为:" + lastKnowLoc);
}
} catch (Exception e) {
tv_show.setText("获取地理位置失败,上次的地理位置为:" + lastKnowLoc);
}
}
// GPS去获取location经纬度
public boolean locationInitByGPS() {
// 没有GPS,直接返回
if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
return false;
}
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
1000, 0, locationListener);
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
return true;//设置location成功,返回true
} else {
return false;
}
}
// network去获取location经纬度
public boolean locationInitByNETWORK() {
// 没有NETWORK,直接返回
if (!locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
return false;
}
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, 1000, 0, locationListener);
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
return true;
} else {
return false;
}
}
//控件初始化
private void init() {
btn_show = (Button) findViewById(R.id.btn_show_location);
tv_show = (TextView) findViewById(R.id.tv_location_show);
}
//这是根据经纬度,向谷歌的API解析发网络请求,然后获取response,这里超时时间不要太短,否则来不及返回位置信息,直接失败了
private void showLocation(final Location loc) {
new Thread(new Runnable() {
@Override
public void run() {
try {
// 去谷歌的地理位置获取中去解析经纬度对应的地理位置
StringBuilder url = new StringBuilder();
url.append("http://maps.googleapis.com/maps/api/geocode/json?latlng=");
url.append(loc.getLatitude()).append(",");
url.append(loc.getLongitude());
url.append("&sensor=false");
// 通过HttpClient去执行HttpGet
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url.toString());
httpGet.addHeader("Accept-Language", "zh-CN");
HttpResponse httpResponse = httpClient.execute(httpGet);
if (httpResponse.getStatusLine().getStatusCode() == 200) {
HttpEntity entity = httpResponse.getEntity();
String response = EntityUtils.toString(entity, "utf-8");
JSONObject jsonObject = new JSONObject(response);
JSONArray resultArray = jsonObject
.getJSONArray("results");
if (resultArray.length() > 0) {
JSONObject subObject = resultArray.getJSONObject(0);
String address = subObject
.getString("formatted_address");
Message message = new Message();
message.what = SHOW_LOCATION;
message.obj = address;
lastKnowLoc = address;
handler.sendMessage(message);
}
} else {
Message message = new Message();
message.what = SHOW_LOCATION;
message.obj = "获取地理位置失败,上次的地理位置为:" + lastKnowLoc;
handler.sendMessage(message);
}
} catch (Exception e) {
Message message = new Message();
message.what = SHOW_LOCATION;
message.obj = "获取地理位置失败,上次的地理位置为:" + lastKnowLoc;
handler.sendMessage(message);
e.printStackTrace();
}
}
}).start();
}
//就是展示下获取到的地理位置
private Handler handler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case SHOW_LOCATION:
String currentPosition = (String) msg.obj;
tv_show.setText(currentPosition);
break;
default:
break;
}
}
};
}上面基本就做好了,但是还不行,因为获取用户地理位置这样的LBS获取,需要申请权限,否则不允许的,程序会报错。
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" /> <uses-permission android:name="android.permission.INTERNET" />
原文链接:http://www.apkbus.com/blog-894806-63307.html

随时随地看视频