checking for back button

gistfile1.java

/*
 * first press the if statement will be executed and thread will run
 * 
 * second press the else statement will be executed waking the sleep
 * key will NOT be 1 therefore calling else and finish
 */
private int timesPressed =0;
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
  // if the back button is pressed
    Thread time = new Thread();
    if(keyCode == KeyEvent.KEYCODE_BACK)
    {
        timesPressed++; //increment on every back button pressed
        
        //on first press start timer(sleep thread) and wait for key press
        if(timesPressed == 1)
        {
            Toast.makeText(
                getBaseContext(), 
                "Wait, you didn't save! Press again to exit.", 
                Toast.LENGTH_SHORT)
                .show();
            time = new Thread(){
               public void run(){
                   try {
                       synchronized(this){

                           // Wait given period of time or exit on touch
                           wait(2500);
                           //if the key is still 1 then the user has not clicked back button
                           if(timesPressed == 1){   
                               timesPressed = 0;    //reset for next press
                           }
                         //else times pressed will be more than 1 as the (thread woken) will resume @ line 142
                           else{                    
                               //finish activity
                               finish();
                           }
                       }
                   } 
                   catch(InterruptedException ex){ 
                       ex.printStackTrace();
                   }
               }
           };
            time.start();
            return false;
        }
        //if key pressed wake thread
        else {
            //wake thread from sleep
            synchronized(time){
                time.notifyAll();
            }
        }

    }
    return super.onKeyDown(keyCode, event);
}