Sample example for Runnable method in android

package com.example.testandproj;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.Toast;

public class MainActivity extends Activity
{
Handler myhHandler=new Handler();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        checkNetConnection();  
    }

    private void checkNetConnection()
    {
Toast.makeText(getApplicationContext(), "wel...", 2000).show();
    myhHandler.postDelayed(run1, 5000);
    }
   
   

Runnable run1=new Runnable() {

@Override
public void run() {

checkNetConnection();
}
};
   
   
   
}