Android开发：如何去除日期中的"/"并追加到指定URL？

Let's walk through how to implement this step by step, with proper error handling and Volley integration:

Step 1: Handle Intent Parameters & URL Construction #

First, we'll safely retrieve the Intent extras, process the departure date to remove slashes, then build our final API URL. Note that I've fixed the & in your original URL to & (since & is an HTML entity and will cause issues in a real API request):

public class MyActivity extends AppCompatActivity {
    // Base URL with placeholders for dynamic params
    private static final String BASE_URL = "https://tripfareapi.herokuapp.com/flightapi?src=%s&dest=%s&depdate=%s";
    
    private String departuredate; // Class-level variable if needed elsewhere

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

        // Retrieve Intent extras safely
        Bundle bundle = getIntent().getExtras();
        if (bundle != null) {
            String from = bundle.getString("from");
            String to = bundle.getString("to");
            departuredate = bundle.getString("departuredate");

            // Validate all required parameters are present
            if (from != null && to != null && departuredate != null) {
                // Remove all "/" from departure date
                String cleanedDate = departuredate.replaceAll("/", "");
                // Build the final URL using String formatting
                String newUrl = String.format(BASE_URL, from, to, cleanedDate);
                
                // Call Volley method to fetch data
                getData(newUrl);
            } else {
                // Handle missing parameters (show error toast, etc.)
                Toast.makeText(this, "Missing required flight parameters", Toast.LENGTH_SHORT).show();
            }
        } else {
            // No extras found in Intent
            Toast.makeText(this, "No flight details provided", Toast.LENGTH_SHORT).show();
        }
    }

Step 2: Implement Volley's getData() Method #

Next, we'll create the getData() method to send a GET request using Volley, handle the response, and manage errors. Make sure you've added Volley to your project dependencies first (e.g., implementation 'com.android.volley:volley:1.2.1' in your app-level build.gradle):

private void getData(String url) {
        // Initialize Volley RequestQueue
        RequestQueue requestQueue = Volley.newRequestQueue(this);

        // Create a StringRequest for GET request
        StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
                response -> {
                    // Handle successful response (parse JSON, update UI, etc.)
                    Log.d("VolleyResponse", "Response: " + response);
                    // Example: Parse the response into your data model here
                },
                error -> {
                    // Handle request errors
                    Log.e("VolleyError", "Error fetching data: " + error.getMessage());
                    Toast.makeText(this, "Failed to fetch flight data", Toast.LENGTH_SHORT).show();
                });

        // Add the request to the queue
        requestQueue.add(stringRequest);
    }
}

Key Notes: #

• Safe Parameter Handling: We added null checks for the Bundle and all retrieved parameters to avoid NullPointerExceptions.
• URL Formatting: Using String.format() makes the URL construction cleaner than concatenation, especially with multiple dynamic values.
• Date Cleaning: replaceAll("/", "") removes all forward slashes from the departure date string. If you only need to remove specific instances, you can adjust this (but this works for full removal).
• Volley Setup: Ensure you have Volley added to your project, and the RequestQueue is properly initialized. You can also use a singleton RequestQueue for better performance across your app.

内容的提问来源于stack exchange，提问作者mDeveloper