public class MainActivity extends AppCompatActivity {
private String provider;//位置提供器
private LocationManager locationManager;//位置服务
private Location location;
private Button btn_show;
private TextView tv_show;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();//关联控件
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);//获得位置服务
provider = judgeProvider(locationManager);
if (provider != null) { //有位置提供器的情况
//为了压制getLastKnownLocation方法的警告
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
location = locationManager.getLastKnownLocation(provider);
if (location != null) {
getLocation(location);//得到当前经纬度并开启线程去反向地理编码
} else {
tv_show.setText("暂时无法获得当前位置");
}
} else {//不存在位置提供器的情况
}
}
private void init() {
btn_show = (Button) findViewById(R.id.btn_show_location);
tv_show = (TextView) findViewById(R.id.tv_location_show);
}
/**
* 得到当前经纬度并开启线程去反向地理编码
*/
public void getLocation(Location location) {
String latitude = location.getLatitude() + "";
String longitude = location.getLongitude() + "";
String url = "http://api.map.baidu.com/geocoder/v2/?ak=pPGNKs75nVZPloDFuppTLFO3WXebPgXg&callback=renderReverse&location=" + latitude + "," + longitude + "&output=json&pois=0";
new MyAsyncTask(url).execute();
}
/**
* 判断是否有可用的内容提供器
*
* @return 不存在返回null
*/
private String judgeProvider(LocationManager locationManager) {
List<String> prodiverlist = locationManager.getProviders(true);
if (prodiverlist.contains(LocationManager.NETWORK_PROVIDER)) {
return LocationManager.NETWORK_PROVIDER;
} else if (prodiverlist.contains(LocationManager.GPS_PROVIDER)) {
return LocationManager.GPS_PROVIDER;
} else {
Toast.makeText(MainActivity.this, "没有可用的位置提供器", Toast.LENGTH_SHORT).show();
}
return null;
}
class MyAsyncTask extends AsyncTask<Void, Void, Void> {
String url = null;//要请求的网址
String str = null;//服务器返回的数据
String address = null;
public MyAsyncTask(String url) {
this.url = url;
}
@Override
protected Void doInBackground(Void... params) {
// str = GetHttpConnectionData.getData(url);
str = HttpUtils.doGetString(url);
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
try {
str = str.replace("renderReverse&&renderReverse", "");
str = str.replace("(", "");
str = str.replace(")", "");
JSONObject jsonObject = new JSONObject(str);
JSONObject address = jsonObject.getJSONObject("result");
String city = address.getString("formatted_address");
String district = address.getString("sematic_description");
Log.e("城市", city);
// tv_show.setText("当前位置：" + city + district);
tv_show.setText("当前位置：" + city );
} catch (JSONException e) {
e.printStackTrace();
}
super.onPostExecute(aVoid);
}
}
}
<pre name="code" class="html">package com.example.locationmanager;
import android.util.Log;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
/**
* Http请求的工具类
*/
public class HttpUtils {
private static final int TIMEOUT_IN_MILLIONS = 5000;
public interface CallBack {
void onRequestComplete(String result);
}
/**
* 异步的Get请求
*
* @param urlStr
* @param callBack
*/
public static void doGetAsyn(final String urlStr, final CallBack callBack) {
new Thread() {
public void run() {
try {
String result = doGetString(urlStr);
if (callBack != null) {
callBack.onRequestComplete(result);
}
} catch (Exception e) {
e.printStackTrace();
}
}
;
}.start();
}
/**
* 异步的Post请求
*
* @param urlStr
* @param params
* @param callBack
* @throws Exception
*/
public static void doPostAsyn(final String urlStr, final String params,
final CallBack callBack) throws Exception {
new Thread() {
public void run() {
try {
String result = doPost(urlStr, params);
if (callBack != null) {
callBack.onRequestComplete(result);
}
} catch (Exception e) {
e.printStackTrace();
}
}
;
}.start();
}
/**
* Get请求，获得返回数据
*
* @param urlStr
* @return
* @throws Exception
*/
public static String doGetString(String urlStr) {
URL url = null;
JSONObject jsonObject = null;
HttpURLConnection conn = null;
InputStream is = null;
ByteArrayOutputStream baos = null;
try {
url = new URL(urlStr);
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
conn.setRequestMethod("GET");
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
if (conn.getResponseCode() == 200) {
is = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder result = new StringBuilder();
baos = new ByteArrayOutputStream();
int len = -1;
byte[] buf = new byte[128];
while ((len = is.read(buf)) != -1) {
baos.write(buf, 0, len);
}
baos.flush();
return baos.toString();
} else {
throw new RuntimeException(" responseCode is not 200 ... ");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (is != null)
is.close();
} catch (IOException e) {
}
try {
if (baos != null)
baos.close();
} catch (IOException e) {
}
conn.disconnect();
}
return null;
}
public static JSONObject doGetJsonObject(String urlStr) {
URL url = null;
JSONObject jsonObject = null;
HttpURLConnection conn = null;
InputStream is = null;
ByteArrayOutputStream baos = null;
try {
url = new URL(urlStr);
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
conn.setRequestMethod("GET");
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
if (conn.getResponseCode() == 200) {
is = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder result = new StringBuilder();
String line = "";
while ((line = reader.readLine()) != null) {
result.append(line);
try {
jsonObject = new JSONObject(line);
} catch (JSONException e) {
e.printStackTrace();
}
}
Log.e("HTTPS TEST", result.toString());
return jsonObject;
} else {
throw new RuntimeException(" responseCode is not 200 ... ");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (is != null)
is.close();
} catch (IOException e) {
}
try {
if (baos != null)
baos.close();
} catch (IOException e) {
}
conn.disconnect();
}
return null;
}
/**
* 向指定 URL 发送POST方法的请求
*
* @param url 发送请求的 URL
* @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
* @return 所代表远程资源的响应结果
* @throws Exception
*/
public static String doPost(String url, String param) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
HttpURLConnection conn = (HttpURLConnection) realUrl
.openConnection();
// 设置通用的请求属性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
conn.setRequestProperty("charset", "utf-8");
conn.setUseCaches(false);
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
if (param != null && !param.trim().equals("")) {
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(param);
// flush输出流的缓冲
out.flush();
}
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
e.printStackTrace();
}
// 使用finally块来关闭输出流、输入流
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}
}
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