Java periodic timer handler

Java_Handler_periodic_timer.java

package com.example.brian.myapplication_timer_handler;

import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;


public class MainActivity extends AppCompatActivity {

    Handler handler = new Handler();
    int timeRemaining = 100000; // 100 second
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        handler.post(runnable);
    }

    private  Runnable runnable = new Runnable() {
        @Override
        public void run() {
            // repeat unttil time remaining is greater than zero.
            timeRemaining = timeRemaining - 5000; //
            if (timeRemaining > 0)
            handler.postDelayed(runnable,5000);
            Log.d("bgloh", "handlier is working");
        }
    };
}