Android's network programming

Attention:

(1) The main thread is not able to do time-consuming operations, network requests are time-consuming operations need to be put into sub-threading.
(2) The child thread cannot update the contents of the control (update UI). So there is a contradiction, the solution is to use handler (processing message mechanism).

Handler: How message mechanisms are written (important)

Steps to use handler:

1. Create a handler in the main thread

Private New Handler () {    publicvoid  handlemessage (android.os.Message msg) {    };} ;

2. Handlermessage method for overriding handler

3. Create a Message object in the child thread to bind the obtained data to the MSG

New Message (); // Another way: Message msg = Messge.obtain; Msg.obj = result;

4. The handler object in the main thread sends a message to the main thread in a child thread

Handler.sendmessage (msg);

5. The Handlermessage method in the main thread accepts data from a child thread and can do an update of the UI.

Android's network programming