如何在查询字符串中发送我的GPS位置(纬度,经度)？

Question

我需要为Android制作一个简单的应用程序,每隔25秒将我的智能手机的位置发送到Web应用程序.我的网络应用程序在线,现在我可以手动传递值,如下所示:

http://mywebapp.com/coordinates/create?latitude=18.463108&longitude=-69.929117

我是Android开发的绝对初学者,所以试着一步一步解释我.

Answer 1

经过深入研究后,我发现我认为最简单的方法是在查询字符串中发送GPS位置(纬度,经度).也许网上没有比此更短的代码.所以我们将分2步完成:

1. 首先将此权限添加到 AndroidManifest.xml

   <uses-permission android:name="android.permission.INTERNET" />
   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
   <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
   

2. 现在你MainActivity.java的类里面的代码public class MainActivity extends Activity { }

   public class MainActivity extends Activity {
   
       public double latitude;
       public double longitude;
   
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
   
           /* Use the LocationManager class to obtain GPS locations */
           LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
           LocationListener mlocListener = new MyLocationListener();
           mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
       }
   
       /* Class My Location Listener */
   
       public class MyLocationListener implements LocationListener {
   
           @Override
           public void onLocationChanged(Location loc) {
               latitude = loc.getLatitude();
               longitude = loc.getLongitude();
               String Text = "My current Latitude = " + latitude  + " Longitude = " + longitude;
               Toast.makeText( getApplicationContext(),Text,Toast.LENGTH_SHORT).show();
   
               SendQueryString(); // for send the  Query String of latitude and logintude to the webapp.
           }
   
   
   
           @Override
           public void onProviderDisabled(String provider) {   
               Toast.makeText( getApplicationContext(),"Gps Disabled",Toast.LENGTH_SHORT ).show();
           }
   
   
           @Override
           public void onProviderEnabled(String provider) {
               Toast.makeText( getApplicationContext(),"Gps Enabled",Toast.LENGTH_SHORT).show();
           }
   
   
           @Override
           public void onStatusChanged(String provider, int status, Bundle extras) {
           }
   
       }/* End of Class MyLocationListener */
   
   
       public void SendQueryString() {
           new Thread() {  
               public void run() {
   
                   String url = "http://mywebapp.com/coordinates/create?latitude=" + latitude +"&longitude=" + longitude;
   
                   try {
                       HttpClient Client = new DefaultHttpClient();
                       HttpGet httpget = new HttpGet(url);
                       Client.execute(httpget);
                   }
                   catch(Exception ex) {
                       String fail = "Fail!";
                       Toast.makeText( getApplicationContext(),fail,Toast.LENGTH_SHORT).show();
                   }
               }
           }.start();
       }
   }
   

注意:正如您所看到我new Thread() { public void run() {/*code here*/}}.start();在函数中使用SendQueryString(),那是因为我们正在尝试向服务器发出请求,因此在Android中您无法向主体线程中的服务器发出请求,其中图形和主要过程是.实际上,如果您尝试在主线程中发出请求,它将返回错误.