Android learning notes: Use of the Andorid network request framework Volley (I)
The Volley framework was released at the Google I/O 2013 conference. Volley was born from Google's network communication library on the Android platform. This framework enables faster, simpler, and more robust network communication. Volley has the following features:
I: easier and faster communication
Ll: Get and Post network requests and network images for efficient asynchronous Processing
III: You can sort the priorities of multiple network requests to cancel multiple network requests.
IV: The network request cache is linked with the Activity lifecycle. When the Activity is destroyed, the network request can be canceled to prevent memory leakage.
Volley is easy to use:
1. Download Volley's jar package or source code,
2. Get RequestQueue. Generally, we put it in the Application for initialization.
3. instantiate a Request object (StringRequest, JsonObjectRequest, JsonArrayRequest) 4. Add the Request to RequestQueue.
The first thing to learn is the basic StringRequest: homepage layout file: activity_main.xml.
Xmlns: tools = http://schemas.android.com/tools
Android: layout_width = match_parent
Android: layout_height = wrap_content
Android: orientation = vertical
Android: layout_margin = 10dp>
Android: id = @ + id/get_btn
Android: layout_width = match_parent
Android: layout_height = wrap_content
Android: gravity = center
Android: text = GET request
Android: textSize = 16sp
Android: layout_marginTop = 15dp/>
Android: id = @ + id/post_btn
Android: layout_width = match_parent
Android: layout_height = wrap_content
Android: gravity = center
Android: text = POST request
Android: textSize = 16sp/>
------------- Request operation ---------------------- public class MainActivity extends Activity implements OnClickListener {
Private Button getBtn, postBtn;
@ Override
Protected void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );
SetContentView (R. layout. activity_main );
GetBtn = (Button) findViewById (R. id. get_btn );
PostBtn = (Button) findViewById (R. id. post_btn );
GetBtn. setOnClickListener (this );
PostBtn. setOnClickListener (this );
}
@ Override
Public void onClick (View v ){
Switch (v. getId ()){
Case R. id. get_btn: // GET request to obtain data
GetStringRequest ();
Break;
Case R. id. post_btn: // POST request to obtain data
PostStringequest ();
Break;
}
}
Private void getStringRequest () {// use the GET method to request StringRequest using string data
String url = http://apis.juhe.cn/mobile/get? Phone = 134 *** 4320 & key = d6099881640aed5e0bacc058cfd4357b; // the key value is the api applied for on the aggregated data.
StringRequest strRequest = new StringRequest (Method. GET, url, new Listener (){
@ Override
Public void onResponse (String arg0) {// request successful
Toast. makeText (MainActivity. this, arg0, Toast. LENGTH_LONG). show ();
}
}, New ErrorListener (){
@ Override
Public void onErrorResponse (VolleyError arg0) {// request failed
Toast. makeText (MainActivity. this, arg0.toString (), Toast. LENGTH_LONG). show ();
}
});
StrRequest. setTag (getLDM );
MyApplication. getRequestQueues (). add (strRequest );
}
Private void postStringequest () {// use the POST method to request StringRequest using string data
String url = http://apis.juhe.cn/mobile/get ?;
StringRequest postRequest = new StringRequest (Method. POST, url, new Listener (){
@ Override
Public void onResponse (String arg0 ){
Toast. makeText (MainActivity. this, arg0, Toast. LENGTH_LONG). show ();
}
}, New ErrorListener (){
@ Override
Public void onErrorResponse (VolleyError arg0) {Toast. makeText (MainActivity. this, arg0.toString (), Toast. LENGTH_LONG). show ();
}
}){
@ Override
Protected Map GetParams () throws AuthFailureError {// The getparams method is used by Volley to transmit parameter information when POST is used to request data.
Map Map = new HashMap ();
Map. put (phone, 134 **** 4320 );
Map. put (key, d6099881640aed5e0bacc058cfd4357b );
Return map;
}
};
PostRequest. setTag (postLDM );
MyApplication. getRequestQueues (). add (postRequest );
}
}
