HttpURLConnection的使用

 static LocationManager manager;
 TextView tv;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        manager=(LocationManager) getSystemService(Context.LOCATION_SERVICE);
        Location location =manager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        //第一次获取地理位置
        firstLocation(location);
        
        manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 6000, 10, locationlistener);//重要函数，监听数据测试
        
       tv=(TextView) findViewById(R.id.text);
        
        Button bt=(Button) findViewById(R.id.bt_tt);
        bt.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
try {
getCityName();
} catch (Exception e) {
e.printStackTrace();
}
}
});
    }
    


    
    @Override
    protected void onPause() {
     super.onPause();
     manager.removeUpdates(locationlistener);
    };
    
    LocationListener locationlistener=new LocationListener() {

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
System.out.println("Status is Changed");
}

@Override
public void onProviderEnabled(String provider) {
System.out.println("Provider now is enabled");
}

@Override
public void onProviderDisabled(String provider) {
System.out.println("Provider now is disabled");
}

@Override
public void onLocationChanged(Location location) {

firstLocation(location);

}
};
    
    
    private void firstLocation(Location location){
     String lastStr;
     if(location!=null){
     double  longitude=location.getLongitude();//经度
     double latitude=location.getLatitude();//纬度
     lastStr="经度longitude"+longitude+"  :纬度latitude："+latitude;
     System.out.println(lastStr);
     }else{
     System.out.println("can't assess you location");
     }
    }
    
    
    
    public void getCityName() throws Exception { 
     URL url=new URL("http://api.map.baidu.com/geocoder?location=22,112&output=json&key=sN4MGVDnL8V7V682QyspfQMs");
        HttpURLConnection http=(HttpURLConnection) url.openConnection();
        //设置是否向httpUrlConnection输出，因为这个是post请求，参数要放在  
        // http正文内，因此需要设为true, 默认情况下是false;  
        http.setDoOutput(true);  
      
        // 设置是否从httpUrlConnection读入，默认情况下是true;  
        http.setDoInput(true);  
      
        // Post 请求不能使用缓存  
        http.setUseCaches(false);  
      
        // 设定传送的内容类型是可序列化的java对象  
        // (如果不设此项,在传送序列化对象时,当WEB服务默认的不是这种类型时可能抛java.io.EOFException)  
        http.setRequestProperty("Content-type","application/x-java-serialized-object");  
      
        // 设定请求的方法为"POST"，默认是GET  
        http.setRequestMethod("GET");  
        http.setReadTimeout(5000);
        // 连接，上面对urlConn的所有配置必须要在connect之前完成，  
        http.connect();  
        
        
        InputStream inStrm = http.getInputStream(); // <===注意，实际发送请求的代码段就在这里 
        InputStreamReader inputStreamReader = new InputStreamReader(inStrm);
        BufferedReader buffered=new BufferedReader(inputStreamReader);
        String na=null;
        String result="";
        while((na=buffered.readLine())!=null){
         result+=na;
        } tv.setText(result);
        buffered.close();
        
    }

====以上是自己代码。做个预留。