ExampleFragment.java

package com.example.fragment;

import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.example.R;

import org.alfonz.utility.Logcat;

public class ExampleFragment extends Fragment {
	private static final long TIMER_DELAY = 5000L; // in milliseconds

	private View mRootView;
	private Handler mTimerHandler;
	private Runnable mTimerRunnable;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setupTimer();
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
		mRootView = inflater.inflate(R.layout.fragment_example, container, false);
		return mRootView;
	}

	@Override
	public void onResume() {
		super.onResume();

		// timer
		startTimer();
	}

	@Override
	public void onPause() {
		super.onPause();

		// timer
		stopTimer();
	}

	private void setupTimer() {
		mTimerHandler = new Handler();
		mTimerRunnable = new Runnable() {
			@Override
			public void run() {
				Logcat.d("timer");

				mTimerHandler.postDelayed(this, TIMER_DELAY);
			}
		};
	}

	private void startTimer() {
		mTimerHandler.postDelayed(mTimerRunnable, 0);
	}

	private void stopTimer() {
		mTimerHandler.removeCallbacks(mTimerRunnable);
	}
}