如何在Android中使用volley发送带有JSON字符串的post请求？

dependencies {
    implementation 'com.android.volley:volley:1.2.1'
}

RequestQueue requestQueue = Volley.newRequestQueue(context);

JSONObject jsonBody = new JSONObject();
try {
    jsonBody.put("key1", "value1");
    jsonBody.put("key2", "value2");
} catch (JSONException e) {
    e.printStackTrace();
}

String url = "http://example.com/api";
JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, url, jsonBody,
        new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                // 请求成功的回调处理
            }
        },
        new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                // 请求失败的回调处理
            }
        });

requestQueue.add(request);

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;

import org.json.JSONException;
import org.json.JSONObject;

public class MainActivity extends AppCompatActivity {

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

        sendPostRequest();
    }

    private void sendPostRequest() {
        RequestQueue requestQueue = Volley.newRequestQueue(this);

        JSONObject jsonBody = new JSONObject();
        try {
            jsonBody.put("key1", "value1");
            jsonBody.put("key2", "value2");
        } catch (JSONException e) {
            e.printStackTrace();
        }

        String url = "http://example.com/api";
        JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, url, jsonBody,
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        // 请求成功的回调处理
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        // 请求失败的回调处理
                    }
                });

        requestQueue.add(request);
    }
}