Android实现自动定位城市并获取天气信息

定位实现代码：

<span style="font-size:14px;">import java.io.IOException;import java.util.List;import android.content.Context;import android.location.Address;import android.location.Criteria;import android.location.Geocoder;import android.location.Location;import android.location.LocationListener;import android.location.LocationManager;import android.os.Bundle;public class LocationUtils {public static String cityName;   //城市名private static Geocoder geocoder;  //此对象能通过经纬度来获取相应的城市等信息//通过地理坐标获取城市名 其中CN分别是city和name的首字母缩写public static void getCNBylocation(Context context){geocoder = new Geocoder(context);//用于获取Location对象，以及其他LocationManager locationManager;String serviceName = Context.LOCATION_SERVICE;//实例化一个LocationManager对象locationManager = (LocationManager) context.getSystemService(serviceName);//provider的类型String provider = LocationManager.NETWORK_PROVIDER;Criteria criteria = new Criteria();criteria.setAccuracy(Criteria.ACCURACY_LOW);    //低精度   高精度：ACCURACY_FINE criteria.setAltitudeRequired(false);       //不要求海拔criteria.setBearingRequired(false);       //不要求方位criteria.setCostAllowed(false);      //不允许产生资费criteria.setPowerRequirement(Criteria.POWER_LOW);   //低功耗//通过最后一次的地理位置来获取Location对象Location location = locationManager.getLastKnownLocation(provider);String queryed_name = updateWithNewLocation(location);if((queryed_name!=null)&&(0!=queryed_name.length())){cityName = queryed_name;}/*第二个参数表示更新的周期，单位为毫秒，第三个参数的含义表示最小距离间隔，单位是米，设定每30秒进行一次自动定位*/locationManager.requestLocationUpdates(provider, 30000, 50, locationListener);//移除监听器，在只有一个widget的时候，这个还是适用的locationManager.removeUpdates(locationListener);}//方位改变是触发，进行调用private final static LocationListener locationListener = new LocationListener() {String tempCityName;@Overridepublic void onStatusChanged(String provider, int status, Bundle extras) {}@Overridepublic void onProviderEnabled(String provider) {}@Overridepublic void onProviderDisabled(String provider) {tempCityName = updateWithNewLocation(null);if((tempCityName!=null)&&(tempCityName.length()!=0)){cityName = tempCityName;}}@Overridepublic void onLocationChanged(Location location) {tempCityName = updateWithNewLocation(location);if((tempCityName!=null)&&(tempCityName.length()!=0)){cityName = tempCityName;}}};//更新location  return cityNameprivate static String updateWithNewLocation(Location location){String mcityName = "";double lat = 0;double lng = 0;List<Address> addList = null;if(location!=null){lat = location.getLatitude();lng = location.getLongitude();}else{cityName = "无法获取地理信息";}try {addList = geocoder.getFromLocation(lat, lng, 1);    //解析经纬度} catch (IOException e) {e.printStackTrace();}if(addList!=null&&addList.size()>0){for(int i=0;i<addList.size();i++){Address add = addList.get(i);mcityName += add.getLocality();}}if(mcityName.length()!=0){return mcityName.substring(0, (mcityName.length()-1));}else{return mcityName;}}}</span>

<span style="font-size:14px;">public class TargetUrl {public final static String url1 = "http://api.map.baidu.com/telematics/v3/weather?location=";public final static String url2 = "&output=json&ak=9cCAXQFB468dsH11GOWL8Lx4";}</span>

根据定位到的城市名获取天气信息实现代码：

<span style="font-size:14px;">import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import org.apache.http.HttpResponse;import org.apache.http.HttpStatus;import org.apache.http.client.ClientProtocolException;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.JSONObject;import android.annotation.SuppressLint;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;import com.mine.xinlangapp.R;import com.mine.xinlangapp.activity.MainActivity;import com.mine.xinlangapp.location.LocationUtils;import com.mine.xinlangapp.location.TargetUrl;public class TupianFragment extends Fragment{private TextView tv, tv1, tv2, tv3, tv4, tv5;private ImageView iv_one, iv_two;private static String cityName = "";private String result = "";private static Context context = null;private Bitmap bitmap1, bitmap2;private static TupianFragment tupian = null;public static int tupian_hour = 60;private static Handler handler3 = new Handler();@SuppressWarnings("deprecation")private static Runnable runnable = new Runnable() {@Overridepublic void run() {tupian.getActivity().removeDialog(0);Toast.makeText(tupian.getActivity(), "加载失败", Toast.LENGTH_SHORT).show();//handler3.postDelayed(this, 2000);    //每两秒执行一次runnable}};//自动刷新private Runnable runnable2 = new Runnable() {@Overridepublic void run() {tupian.send(cityName);Message m = tupian.handler.obtainMessage();tupian.handler.sendMessage(m);handler3.postDelayed(this, tupian_hour*3600*1000);}};@SuppressLint("HandlerLeak")@SuppressWarnings("deprecation")public static Handler handler1 = new Handler(){public void handleMessage(Message msg){tupian.getActivity().showDialog(0);//启动定时器handler3.postDelayed(runnable, 5000);   //五秒后执行new Thread(new Runnable() {@Overridepublic void run() {tupian.send(cityName);Message m = tupian.handler.obtainMessage();tupian.handler.sendMessage(m);}}).start();}};@SuppressLint("HandlerLeak")private Handler handler = new Handler(){public void handleMessage(Message msg){if(result != null){try {JSONObject datajson = new JSONObject(result);  //第一步，将String格式转换回json格式JSONArray results = datajson.getJSONArray("results");  //获取results数组JSONObject city = results.getJSONObject(0);String currentCity = city.getString("currentCity");  //获取city名字String pm25 = city.getString("pm25");   //获取pm25tv.setText("城市："+currentCity+"\n"+"pm25："+pm25);  //测试城市和pm25JSONArray index = city.getJSONArray("index"); //获取index里面的JSONArray//获取穿衣JSONObject cy = index.getJSONObject(0);String titlec = cy.getString("title");String zsc = cy.getString("zs");String tiptc = cy.getString("tipt");String desc = cy.getString("des");//获取洗车JSONObject xc = index.getJSONObject(1);String titlex = xc.getString("title");String zsx = xc.getString("zs");String tiptx = xc.getString("tipt");String desx = xc.getString("des");tv1.setText(titlec+" : "+zsc+"\n"+tiptc+" : "+desc);tv2.setText(titlex+" : "+zsx+"\n"+tiptx+" : "+desx);//weather_data, 未来几天JSONArray weather_data = city.getJSONArray("weather_data");//获取今天JSONObject today = weather_data.getJSONObject(0);String date0 = today.getString("date");final String dayPictureUrl0 = today.getString("dayPictureUrl");final String nightPictureUrl0 = today.getString("nightPictureUrl");String weather0 = today.getString("weather");String wind0 = today.getString("wind");String temperature0 = today.getString("temperature");tv3.setText("\n"+"今天："+date0+"\n"+"实时："+weather0+"\n"+"风力："+wind0+"\n"+"温度范围："+temperature0+"\n");//获取明天JSONObject tomorrow = weather_data.getJSONObject(1);String date1 = tomorrow.getString("date");String weather1 = tomorrow.getString("weather");String wind1 = tomorrow.getString("wind");String temperature1 = tomorrow.getString("temperature");tv4.setText("明天："+date1+"\n"+weather1+"\n"+"风力："+wind1+"\n"+"温度范围："+temperature1+"\n");//获取后天JSONObject after_tomorrow = weather_data.getJSONObject(2);String date2 = after_tomorrow.getString("date");String weather2 = after_tomorrow.getString("weather");String wind2 = after_tomorrow.getString("wind");String temperature2 = after_tomorrow.getString("temperature");tv5.setText("后天："+date2+"\n"+weather2+"\n"+"风力："+wind2+"\n"+"温度范围："+temperature2+"\n");new Thread(new Runnable() {@Overridepublic void run() {bitmap1 = returnBitMap(dayPictureUrl0);bitmap2 = returnBitMap(nightPictureUrl0);Message m = handler2.obtainMessage();handler2.sendMessage(m);}}).start();} catch (Exception e) {e.printStackTrace();}}super.handleMessage(msg);}};@SuppressWarnings("deprecation")@SuppressLint("HandlerLeak")private Handler handler2 = new Handler(){public void handleMessage(Message msg){if(bitmap1!=null)iv_one.setImageBitmap(bitmap1);if(bitmap2!=null)iv_two.setImageBitmap(bitmap2);if(bitmap1!=null&&bitmap2!=null){//停止计时器handler3.removeCallbacks(runnable);tupian.getActivity().removeDialog(0);}}};@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){context = TupianFragment.this.getActivity();tupian = TupianFragment.this;LocationUtils.getCNBylocation(context);cityName = LocationUtils.cityName;MainActivity.text.setText(cityName);View view = inflater.inflate(R.layout.tupianfragment, container,false);iv_one = (ImageView) view.findViewById(R.id.iv_one);iv_two = (ImageView) view.findViewById(R.id.iv_two);tv = (TextView) view.findViewById(R.id.tv);tv1 = (TextView) view.findViewById(R.id.tv1);tv2 = (TextView) view.findViewById(R.id.tv2);tv3 = (TextView) view.findViewById(R.id.tv3);tv4 = (TextView) view.findViewById(R.id.tv4);tv5 = (TextView) view.findViewById(R.id.tv5);//启动计时器handler3.postDelayed(runnable2, tupian_hour*3600*1000);new Thread(new Runnable() {@Overridepublic void run() {send(cityName);Message m = handler.obtainMessage();handler.sendMessage(m);}}).start();return view;}private String send(String city){String target = TargetUrl.url1+city+TargetUrl.url2;  //要提交的目标地址HttpClient httpclient = new DefaultHttpClient();HttpGet httpRequest = new HttpGet(target);  //创建HttpGet对象HttpResponse httpResponse = null;try {httpResponse = httpclient.execute(httpRequest);if(httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK){result = EntityUtils.toString(httpResponse.getEntity()).trim();  //获取返回的字符串}else{result = "fail";}} catch (ClientProtocolException e) {e.printStackTrace();}catch (IOException e) {e.printStackTrace();}return null;}//以Bitmap的方式获取一张图片public Bitmap returnBitMap(String url){URL myFileUrl = null;Bitmap bitmap = null;try{myFileUrl = new URL(url);}catch(MalformedURLException e){e.printStackTrace();}try{HttpURLConnection conn = (HttpURLConnection) myFileUrl.openConnection();conn.setDoInput(true);conn.connect();InputStream is = conn.getInputStream();bitmap = BitmapFactory.decodeStream(is);is.close();}catch(IOException e){e.printStackTrace();}return bitmap;}@Overridepublic void onDestroy() {//停止计时器handler3.removeCallbacks(runnable2);super.onDestroy();}}</span>

最后别忘记添加权限：

<span style="font-size:14px;">    <uses-permission android:name="android.permission.INTERNET"/>    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /></span>

说明：

<span style="font-size:14px;">criteria.setAccuracy(Criteria.ACCURACY_LOW);    //低精度   高精度：ACCURACY_FINE 使用网络定位要选择低精度，如果选择了高精度它会第一选择为：GPS定位，没有开启GPS定位，才会使用网络定位。</span>

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