Java – pause the timer and continue

Please refer to the code posted by @ Yuri here How to stop a timer after certain number of times. If I want to stop it because of some conditions, then restart it What should I do?

private final static int DELAY = 10000;
    private final Handler handler = new Handler();
    private final Timer timer = new Timer();
    private final TimerTask task = new TimerTask() {
        private int counter = 0;
        public void run() {
            handler.post(new Runnable() {
                public void run() {
                    Toast.makeText(MainActivity.this,"test",Toast.LENGTH_SHORT).show();
                }
            });
            if(++counter == 4) {
                timer.cancel();
            }

    //do some stuff in my app
   //restart the timer again

        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        timer.schedule(task,DELAY,DELAY);

    }

This is what I tried, but it keeps collapsing

final int DELAY = 10000;
        Timer timer;
        MyTask task;
        startManager Scanner;
        Handler handler;



        public class MyTask extends TimerTask {

            @Override
            public void run() {
                handler.post(new Runnable() {
                    public void run() {
                        //do Stuff here
                        }
        });
    }
        public class startManager {

            public startManager() {
                handler = new Handler();
                timer = new Timer();
            }

            public void start() {

                timer.schedule(task,DELAY);
            }

            public void cancel() {

                timer.cancel();
                timer.purge();

            }
        }

    }

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

Scanner = new startManager();
//do some stuff
 if (...)
Scanner.cancel()
//restart the timer and its task
Scanner=new startManager();
        }

Solution

If you have cancelled a timer, you cannot restart it. You must create a timer

See this answer, which contains a video and source code. How did I do something similar

There are basically two methods: pause and resume

Pause:

public void pause() {
    this.timer.cancel();
}

In your resume:

public void resume() {
    this.timer = new Timer();
    this.timer.schedule( aTask,1000 );
}

This makes the feeling of pause / recovery

If your timer performs different operations based on the state of your application, consider using statepattern

Define abstract state:

abstract class TaskState  {
    public void run();
    public TaskState next();
}

And provide as many states as possible The key is that one country leads you to another

class InitialState extends TaskState {
    public void run() {
        System.out.println( "starting...");
    }
    public TaskState next() {
         return new FinalState();
    }
 }
 class FinalState extends TaskState  {
     public void run() {
         System.out.println("Finishing...");
     }
     public TaskState next(){
         return new InitialState();
    }
 }

Then change the status in the timer

Timer timer = new Timer();
TaskState state = new InitialState();

timer.schedule( new TimerTask() {
     public void run() {
          this.state.run();
          if( shouldChangeState() ) {
              this.state = this.state.next();
           }
     }
 },1000 );

Finally, if you need to do the same thing but at different speeds, you can consider using the timing framework It's a little complicated, but let's do some cool animation by allowing some components to be painted at different speeds (not linear)