Android Volley to Handle Redirect

Android volley to handle redirect

I fixed it catching the http status 301 or 302, reading redirect url and setting it to request then throwing expection which triggers retry.

Edit: Here are the main keys in volley lib which i modified:

• Added method public void setUrl(final String url) for class Request

• In class BasicNetwork is added check for redirection after // Handle cache validation, if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY) || statusCode == HttpStatus.SC_MOVED_TEMPORARILY), there I read the redirect url with responseHeaders.get("location"), call setUrl with request object and throw error

• Error get's catched and it calls attemptRetryOnException

• You also need to have RetryPolicy set for the Request (see DefaultRetryPolicy for this)

Change Redirect Policy of Volley Framework

I think A HttpStack implementation for Volley that uses OkHttp as its transport is the best solution

RequestQueue queue = Volley.newRequestQueue(this);

Network network = new BasicNetwork(new OkHttpStack());
RequestQueue queue = new RequestQueue(new DiskBasedCache(new File(getCacheDir(), "volley")), network);
queue.start();

OkHttpStack class:

public class OkHttpStack extends HurlStack {
private final OkHttpClient client;

public OkHttpStack() {
this(new OkHttpClient());
}

public OkHttpStack(OkHttpClient client) {
if (client == null) {
throw new NullPointerException("Client must not be null.");
}
this.client = client;
}

@Override protected HttpURLConnection createConnection(URL url) throws IOException {
return client.open(url);
}
}

Update:
if you are using new version of okhttp stack then use

public class OkHttpStack extends HurlStack {
    private final OkUrlFactory mFactory;

    public OkHttpStack() {
        this(new OkHttpClient());
    }

    public OkHttpStack(OkHttpClient client) {
        if (client == null) {
            throw new NullPointerException("Client must not be null.");
        }
        mFactory = new OkUrlFactory(client);
    }

    @Override
    protected HttpURLConnection createConnection(URL url) throws IOException {
       return mFactory.open(url);
    }
}

How to enable redirection in Volley NetworkImageView?

Isn't it better to use a gilde to load photos?

Or use Gradle:

repositories {
  mavenCentral()
  google()
}

dependencies {
  implementation 'com.github.bumptech.glide:glide:4.11.0'
  annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'
}

use in activity or anything :

Glide
    .with(context)
    .load(url)
    .centerCrop()
    .placeholder(R.drawable.imageload)
    .into(myImageView);

Just as easily

Redirect User to a certain activity based on Volley's response code (Android)

So I found a fix which was a tad tedious but simple.
Basically I had to override the deliverError method. In that method the errorCode was present, as a result based on that code I was able to perform the redirection.
Also needed to pass the context in the constructor. Needed to make that change in all request calls.

The reason this worked as per my understanding is that deliverError is called when the worker thread needs is trying to merge back to the main UI Thread. This bifurcation is caused in parseNetworkResponse since it's a heavy process which is why a worker thread is assigned to it.

Updated Class:

public class JSONObjectRequestUTF8 extends JsonObjectRequest {
//This is a new parameter
private Context context;
public JSONObjectRequestUTF8(int method, String url, JSONObject jsonRequest,
                       Listener<JSONObject> listener, ErrorListener errorListener,Context context) {
    super(method, url, jsonRequest, listener,
            errorListener);
    this.context = context;
    setShouldCache(false);
}

@Override
protected Response<JSONObject> parseNetworkResponse (NetworkResponse response) {
    try {
        String utf8String = new String(response.data, "UTF-8");
        return Response.success(new JSONObject(utf8String), HttpHeaderParser.parseCacheHeaders(response));
    } catch (UnsupportedEncodingException e) {
        // log error
        return Response.error(new ParseError(e));
    } catch (JSONException e) {
        // log error
        return Response.error(new ParseError(e));
    }
}

@Override
public void deliverError(VolleyError error) {
    if(error.networkResponse.statusCode == HttpURLConnection.HTTP_PRECON_FAILED || error.networkResponse.statusCode == HttpURLConnection.HTTP_UNAUTHORIZED){
        Intent i = new Intent(context, LoginActivity.class);
        i.putExtra(EReceiptsConstants.ERROR_MESSAGE, EReceiptsConstants.SESSION_MESSAGE);
        i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        context.startActivity(i);
        return;
    }
}

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