Volley offers the following benefits:
- Automatic scheduling of network requests.
- Multiple concurrent network connections.
- Transparent disk and memory response caching with standard HTTP cache coherence
- Support for request prioritization.
- Cancellation request API. You can cancel a single request, or you can set blocks or scopes of requests to cancel.
- Ease of customization, for example, for retry and backoff.
- Strong ordering that makes it easy to correctly populate your UI with data fetched asynchronously from the network.
- Debugging and tracing tools.
Request: A Base Class which contains Network related information like HTTP Methods.
StringRequest: HTTP Request where the response is parsed a String.
JsonObjectRequest: HTTP Request where the response is JSONObject.
Update build.gradle file
dependencies {
...
compile 'com.mcxiaoke.volley:library:1.0.19'
}
Initialize Request Queue
//Instantiate the RequestQueue.
RequestQueue queue = Volley.newRequestQueue(this);
String url = "Url goes here";
Making DELETE Requests
StringRequest deleteRequest = new StringRequest(Request.Method.DELETE, url,
new Response.Listener<String>()
{
@Override
public void onResponse(String response) {
// response
Log.d("Response", response);
}
},
new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error) {
// error.
Log.d("Error.Response", response);
}
}
);
queue.add(deleteRequest);
Making PUT Requests
StringRequest putRequest = new StringRequest(Request.Method.PUT, url,
new Response.Listener<String>()
{
@Override
public void onResponse(String response) {
// response
Log.d("Response", response);
}
},
new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error) {
// error
Log.d("Error.Response", response);
}
}
) {
@Override
protected Map<String, String> getParams()
{
Map<String, String> params = new HashMap<String, String> ();
params.put("parameter1", "value1");
params.put("parameter2", "value2");
return params;
}
};
queue.add(putRequest);
Making POST Requests
StringRequest postRequest = new StringRequest(Request.Method.POST, url,
new Response.Listener<String>()
{
@Override
public void onResponse(String response) {
// response
Log.d("Response", response);
}
},
new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error) {
// error
Log.d("Error.Response", response);
}
}
) {
@Override
protected Map<String, String> getParams()
{ // Adding parameters
Map<String, String> params = new HashMap<String, String>();
params.put("parameter1", "value1");
params.put("parameter2", "value2");
return params;
}
};
queue.add(postRequest);
Making GET Requests
// prepare the Request
JsonObjectRequest getRequest = new JsonObjectRequest(Request.Method.GET, url, null,
new Response.Listener<JSONObject>()
{
@Override
public void onResponse(JSONObject response) {
// display response
Log.d("Response", response.toString());
}
},
new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error) {
//error
Log.d("Error.Response", response);
}
}
);
// add it to the RequestQueue
queue.add(getRequest);
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