要实现安卓HTTP监听器，可以按照以下步骤进行：

1. 首先，在AndroidManifest.xml文件中添加网络访问权限。在标签下添加以下代码：

2. 创建一个类来实现HTTP监听器。示例代码如下：

import android.os.AsyncTask;
import android.util.Log;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public class HttpListener extends AsyncTask {
    private static final String TAG = "HttpListener";
    private static final int PORT = 8080; // 监听的端口号

    @Override
    protected Void doInBackground(Void... params) {
        ServerSocket serverSocket = null;
        try {
            serverSocket = new ServerSocket(PORT);
            Log.d(TAG, "Server started. Listening on port " + PORT);

            while (true) {
                Socket clientSocket = serverSocket.accept();
                BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
                String line;
                while ((line = in.readLine()) != null) {
                    Log.d(TAG, "Received: " + line);
                }
                in.close();
                clientSocket.close();
            }
        } catch (IOException e) {
            Log.e(TAG, "IOException: " + e.getMessage());
        } finally {
            if (serverSocket != null) {
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    Log.e(TAG, "IOException: " + e.getMessage());
                }
            }
        }

        return null;
    }
}

3. 在需要监听HTTP请求的地方创建一个HttpListener对象并调用它的execute()方法启动监听器。示例代码如下：

HttpListener httpListener = new HttpListener();
httpListener.execute();

这样，你就可以在安卓应用中监听HTTP请求了。当有HTTP请求到达时，日志中会打印出请求的内容。请注意，上面的示例代码是在后台线程中执行的，如果需要在UI线程中执行，请根据具体需求进行调整。