if you want to doing thread and display UI, below sample code will make you display and update the UI at the thread mode.
package com.powenko.Tutorial_thread_HandlerAndRun;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
public class Tutorial_thread_HandlerAndRunActivity extends Activity {
protected ProgressDialog autoProgressDialog3;
protected Handler handler;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Fun_hread_HandlerAndRun();
Fun_hread_HandlerAndRun_Delay();
}
protected void Fun_hread_HandlerAndRun(){
/////////////////////////////////
handler=new Handler();
try{
if(autoProgressDialog3!=null){ autoProgressDialog3.dismiss(); autoProgressDialog3=null;}
autoProgressDialog3 = ProgressDialog.show(this, "", "waiting...", true);
new Thread(new Runnable()
{
@Override
public void run()
{
handler.post(new Runnable() {
@Override
public void run() {
Fun_DoSomething();
if(autoProgressDialog3!=null){ autoProgressDialog3.dismiss(); autoProgressDialog3=null;}
}
});
}
}).start();
}
catch(Exception e){ }
}
////////
protected void Fun_hread_HandlerAndRun_Delay(){
/////////////////////////////////
handler=new Handler();
try{
if(autoProgressDialog3!=null){ autoProgressDialog3.dismiss(); autoProgressDialog3=null;}
autoProgressDialog3 = ProgressDialog.show(this, "", "waiting...", true);
new Thread(new Runnable()
{
@Override
public void run()
{
handler.postDelayed(new Runnable() {
@Override
public void run() {
Fun_DoSomething();
if(autoProgressDialog3!=null){ autoProgressDialog3.dismiss(); autoProgressDialog3=null;}
}
},100);
}
}).start();
}
catch(Exception e){ }
}
protected void Fun_DoSomething(){
try{
SystemClock.sleep(2000);
}
catch(Exception e){ }
}
}
if you don’t want to display waiting dialog,
below code could make it working,
The simple fix to your example is:
final Runnable r = new Runnable()
{
public void run()
{
tv.append("Hello World");
handler.postDelayed(this, 1000);
}
};
handler.postDelayed(r, 1000);
Or we can use normal thread for example (with original Runner):
Thread thread = new Thread()
{
@Override
public void run() {
try {
while(true) {
sleep(1000);
handler.post(r);
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
thread.start();
sample code:
Tutorial_thread_HandlerAndRun