Ntrip Android Demo

以下是一个简单的实现Ntrip协议的Android demo：

1. 首先，您需要在build.gradle文件中添加以下依赖项：

   implementation 'com.github.YourMJK:RtcmNtrip:v1.0'
   implementation 'com.squareup.okhttp3:okhttp:4.9.0'
   

2. 然后，在您的Activity类中创建一个NtripClient类的实例，并使用以下代码连接到Ntrip服务器：

   import okhttp3.OkHttpClient;
   import okhttp3.Request;
   import okhttp3.Response;
   import org.rtcm.ntrip.RtcmNtripDecoder;
   
   public class MainActivity extends AppCompatActivity {
       private NtripClient mNtripClient = null;
       
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
           
           String ntripServerUrl = "your_ntrip_server_url";
           String ntripServerPort = "your_ntrip_server_port";
           String mountpoint = "your_mountpoint_name";
           String username = "your_username";
           String password = "your_password";
   
           OkHttpClient httpClient = new OkHttpClient.Builder().build();
           Request request = new Request.Builder()
                   .url(ntripServerUrl + ":" + ntripServerPort)
                   .header("User-Agent", "NTRIP Client")
                   .header("Authorization", Credentials.basic(username, password))
                   .header("Ntrip-Version", "Ntrip/2.0")
                   .header("ICY-MetaData", "1")
                   .header("Connection", "close")
                   .header("Pragma", "no-cache")
                   .header("Cache-Control", "no-cache")
                   .build();
   
           try {
               Response response = httpClient.newCall(request).execute();
               if (response.isSuccessful()) {
                   InputStream inputStream = response.body().byteStream();
                   RtcmNtripDecoder decoder = new RtcmNtripDecoder(inputStream);
                   mNtripClient = new NtripClient(decoder, mountpoint);
                   mNtripClient.connect();
               } else {
                   // Handle connection failure
               }
           } catch (IOException e) {
               e.printStackTrace();
           }
       }
   }
   

3. 当连接成功后，您可以使用以下代码接收和处理来自Ntrip服务器的数据流：

   private void startListening() {
        mNtripClient.addListener(new NtripClientListener() {
            @Override
            public void onNmeaReceived(String nmea) {
                // Process received NMEA sentence
            }
   
            @Override
            public void onGnssDataReceived(GnssMeasurement measurement) {
                // Process received GNSS measurement data
            }
   
            @Override
            public void onMessageReceived(byte[] message) {
                // Process received RTCM message
            }
   
            @Override
            public void onError(Exception e) {
                // Handle error
            }
        });
   
        mNtripClient.start();
    }
   

请注意，这只是一个简单示例，并且您需要根据您的具体要求进行修改和定制。此外，还需要确认您使用的Ntrip服务器是否支持Ntrip v2.0协议，并且您需要在输入流中读取并解码RTCM数据。