TimerHandlerActivity.java

package com.godoro.androidclients;

import android.app.*;
import android.os.*;
import android.view.*;
import android.widget.*;

public class TimerHandlerActivity extends Activity {

    private Button startStopButton;
    private Button pauseResumeButton;
    private TextView elapsedTimeText;
    private boolean started=false;
    private boolean paused=false;
    private int elapsedSeconds=0;
    private int durationSeconds=10;
    private Handler handler = new Handler();
    private boolean durationFixed=true;
    private Runnable currentRunnable;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_timer_handler);
        elapsedTimeText = (TextView) findViewById(R.id.elapsedTimeText);
        startStopButton = (Button) findViewById(R.id.startStopButton);
        pauseResumeButton = (Button) findViewById(R.id.pauseResumeButton);
    }
    public void onClickStartStop(View view) {
        elapsedTimeText.setText(Long.toString(elapsedSeconds));
        if(!started){
            startTimer();
        }else{
            stopTimer();
        }
    }
    public void onClickPauseResume(View view) {
        if(!paused){
            paused=true;
            pauseResumeButton.setText(R.string.resume);
        }else{
            paused=false;
            pauseResumeButton.setText(R.string.pause);
        }
    }
    private void startTimer(){
        elapsedSeconds=0;
        elapsedTimeText.setText(Integer.toString(elapsedSeconds));
        started=true;
        startStopButton.setText(R.string.stop);
        currentRunnable = new Runnable() {
            @Override
            public void run() {
                if(paused){
                    handler.postDelayed(this, 1000);
                    return;
                }
                elapsedSeconds += 1;
                showTime();
                if (elapsedSeconds >= durationSeconds && durationFixed) {
                    stopTimer();
                } else {
                    handler.postDelayed(this, 1000);
                }
            }
        };
        handler.removeCallbacks(currentRunnable);
        handler.postDelayed(currentRunnable, 1000);
    }
    private void showTime(){
        elapsedTimeText.setText(Integer.toString(elapsedSeconds));
    }
    private void stopTimer(){
        handler.removeCallbacks(currentRunnable);
        started=false;
        startStopButton.setText(R.string.start);
        String message="Oturum bitti : "+elapsedSeconds+"/"+durationSeconds;
        Toast.makeText(this,message,Toast.LENGTH_LONG).show();
    }
}