Android Boot Thread

============ Problem Description ============

private int i = 0;private int x = 0; @Overrideprotected void onCreate (Bundle savedinstancestate) {super.oncreate (Savedinsta Ncestate); Setcontentview (r.layout.hello_world_layout); Button B = (button) Findviewbyid (R.id.button), final TextView v2 = (TextView) Findviewbyid (R.ID.T2); new Thread () {public VO ID run () {try {thread.sleep ()} catch (Interruptedexception e) {//TODO auto-generated catch Blocke.printstacktrace () ;} V2.settext (x + + "");};}. Start ();

The beginner wrote a thread. This will make an error and solve

============ Solution 1============

SetText need to re-draw the view, display text and re-draw the view in Android, you need to call in the main thread, or put the message into the Looper queue

============ Solution 2============

The UI control's function SetText can only be called in the UI thread, otherwise it will cause an exception.
Can be handled with Asynctask.

============ Solution 3============

Sample code

public class mainactivity extends activity {private  button incbutton;private textview msgtextview;private int count = 0;@ Overrideprotected void oncreate (bundle savedinstancestate)  {super.oncreate ( Savedinstancestate); Setcontentview (R.layout.activity_main);msgtextview =  (TextView) findViewById ( R.id.msgtextview);incbutton =  (Button) Findviewbyid (R.id.incbutton); Incbutton.setonclicklistener (new  view.onclicklistener ()  {@Overridepublic  void onclick (view v)  {asynctask<void , void, string> thread = new asynctask<void, void, string> ()  {@Overridepublic  string doinbackground (void... params)  {count++;return  String.Format ("%d",  count);} @Overridepublic  void onpostexecute (string msg)  {msgtextview.settext (msg);}; Thread.execute ();}});} 
 

============ Solution 4============

or wrap the thread into an inner class, and the code will be more concise and elegant:

public class mainactivity extends activity {private  button incbutton;private textview msgtextview;private int count = 0;@ Overrideprotected void oncreate (bundle savedinstancestate)  {super.oncreate ( Savedinstancestate); Setcontentview (R.layout.activity_main);msgtextview =  (TextView) findViewById ( R.id.msgtextview);incbutton =  (Button) Findviewbyid (R.id.incbutton); Incbutton.setonclicklistener (new  view.onclicklistener ()  {@Overridepublic  void onclick (view v)  {new mytask () . Execute ();}}); private class mytask extends asynctask<void, void, string> {@ Overridepublic string doinbackground (Void... params)  {count++;return string.format ("% D ",  count);} @Overridepublic  void onpostexecute (string msg)  {msgtextview.settext (msg);}} 

Android Boot thread