要在Android Volley中发送多个请求，可以使用Volley的RequestQueue和Request来管理多个请求。下面是一个示例代码：

1. 创建一个自定义的RequestQueue单例类，用于管理请求队列：

public class MyRequestQueue {
    private static MyRequestQueue instance;
    private RequestQueue requestQueue;
    private Context context;

    private MyRequestQueue(Context context) {
        this.context = context.getApplicationContext();
        requestQueue = getRequestQueue();
    }

    public static synchronized MyRequestQueue getInstance(Context context) {
        if (instance == null) {
            instance = new MyRequestQueue(context);
        }
        return instance;
    }

    public RequestQueue getRequestQueue() {
        if (requestQueue == null) {
            requestQueue = Volley.newRequestQueue(context.getApplicationContext());
        }
        return requestQueue;
    }

    public  void addToRequestQueue(Request request) {
        getRequestQueue().add(request);
    }
}

2. 创建多个自定义的Request子类，每个子类对应一个请求。例如，创建一个GetRequest子类：

public class GetRequest extends Request {
    private Response.Listener listener;

    public GetRequest(String url, Response.Listener listener, Response.ErrorListener errorListener) {
        super(Method.GET, url, errorListener);
        this.listener = listener;
    }

    @Override
    protected Response parseNetworkResponse(NetworkResponse response) {
        String result = new String(response.data);
        return Response.success(result, HttpHeaderParser.parseCacheHeaders(response));
    }

    @Override
    protected void deliverResponse(String response) {
        listener.onResponse(response);
    }
}

3. 在Activity或Fragment中使用MyRequestQueue来发送多个请求：

public class MainActivity extends AppCompatActivity {
    private static final String TAG = MainActivity.class.getSimpleName();
    private static final String URL1 = "http://example.com/api1";
    private static final String URL2 = "http://example.com/api2";

    private TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textView = findViewById(R.id.textView);

        // 发送第一个请求
        MyRequestQueue.getInstance(this).addToRequestQueue(new GetRequest(URL1, new Response.Listener() {
            @Override
            public void onResponse(String response) {
                Log.d(TAG, "Response1: " + response);
                textView.setText(response);
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e(TAG, "Error1: " + error.getMessage());
            }
        }));

        // 发送第二个请求
        MyRequestQueue.getInstance(this).addToRequestQueue(new GetRequest(URL2, new Response.Listener() {
            @Override
            public void onResponse(String response) {
                Log.d(TAG, "Response2: " + response);
                // 处理第二个请求的响应
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e(TAG, "Error2: " + error.getMessage());
            }
        }));
    }
}

注意：

• 在MyRequestQueue的addToRequestQueue方法中，可以根据需要设定请求的优先级、缓存策略等。
• 在GetRequest的parseNetworkResponse方法中，可以根据实际情况解析服务器返回的数据。