Android Volley API的ImageRequest无法工作，Logcat无报错信息

Hey there! Let's walk through the common issues that might be causing your Volley ImageRequest to fail silently, and fix them step by step:

1. You Forgot to Add the Request to Volley's RequestQueue #

This is the most common oversight! You've created the ImageRequest object, but you haven't actually added it to Volley's request queue to execute it. Add these lines right after creating your ImageRequest:

RequestQueue queue = Volley.newRequestQueue(getApplicationContext());
queue.add(ir);

2. Missing Internet Permission #

Make sure you've declared the internet permission in your AndroidManifest.xml file—without it, your app can't access the network at all:

<uses-permission android:name="android.permission.INTERNET" />

3. Cleartext HTTP Restriction (Android 9+) #

If your app targets API level 28 or higher, Android blocks plain HTTP requests by default. Since your image URL uses http://, you have two options:

• Switch the URL to use https:// (the more secure, preferred choice)
• Enable cleartext traffic by adding this attribute to your <application> tag in AndroidManifest.xml:

  android:usesCleartextTraffic="true"
  

4. Incomplete Error Logging #

Your current ErrorListener only prints a generic message without the actual error details, which is why you're seeing nothing useful in Logcat. Update it to capture full error info:

new Response.ErrorListener() {
    public void onErrorResponse(VolleyError error) {
        Log.e(TAG, "Image Load Error: " + error.getMessage(), error);
    }
}

This will print the stack trace and specific error message, helping you pinpoint issues like network timeouts, invalid URLs, or server errors.

5. Verify ImageView and Layout Setup #

Double-check these basics:

• You've called setContentView(R.layout.your_layout_file) before calling findViewById(R.id.imgView)
• The imgView ID in your layout file matches exactly with R.id.imgView (no typos!)

6. Validate the Image URL #

Test the URL http://i.imgur.com/7spzG.png directly in a browser to confirm it loads an image. If the URL is broken or redirects to an invalid location, Volley won't be able to fetch the image.

Full Corrected Code Example #

Here's how your code should look with all these fixes applied:

ImageView imageView = (ImageView) findViewById(R.id.imgView);
String imageUrl = "http://i.imgur.com/7spzG.png";

ImageRequest ir = new ImageRequest(imageUrl, 
    new Response.Listener<Bitmap>() {
        @Override
        public void onResponse(Bitmap response) {
            imageView.setImageBitmap(response);
        }
    }, 
    0, 0, Bitmap.Config.RGB_565, 
    new Response.ErrorListener() {
        public void onErrorResponse(VolleyError error) {
            Log.e(TAG, "Image Load Error: " + error.getMessage(), error);
        }
    }
);

// Add the request to Volley's execution queue
RequestQueue queue = Volley.newRequestQueue(getApplicationContext());
queue.add(ir);

内容的提问来源于stack exchange，提问作者Vaishali Modi