how to set different onclicklisteners on same button click?

Question

I am implementing a timer in android with one text view and one button for start/stop.

How do I set register different events on clicklistener of the same button, such that when it is clicked the first time it will start a timer and when clicked a second time it will stop the timer and report the time between events? I am implementing a timer in android with one text view and one button for start/stop.

How do I set register different events on clicklistener of the same button, such that when it is clicked the first time it will start a timer and when clicked a second time it will stop the timer and report the time between events?

Edit1

what i did is,

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_depth);
    findViewById(R.id.btn).setOnClickListener(this);

}
boolean showingFirst = true;
public void generate(View view){

    if(showingFirst){
        long startTime = System.currentTimeMillis();
        showingFirst = false;
    }else{
        long difference = System.currentTimeMillis() - startTime;
        showingFirst = true;
        TextView myText = (TextView)findViewById(R.id.tv);
        myText.setText(String.valueOf(difference));
    }

}

but since long starttime is started in if when the control enters else loop it shows cannot resolve symbol 'startTime'

please help and special thanks to eliamyro

you can use condition inside onClickListener, don't need different onClick. — Niranj Patel, Jan 30 '18 at 13:10
could you please refer me to link describing that or give a little code snippet. Thank you — , Jan 30 '18 at 13:13
I believe that @NiranjPatel is referring to a simple `if` condition in the listener. I should be simple enough to use that if you have some prior Java knowledge. — Jakub Jankowski, Jan 30 '18 at 13:39

score 1 · Accepted Answer · edited Jan 30 '18 at 14:13

1

You can do it using a global boolean isStart and start or stop the timer depending on the value of the isStart.

btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (isStart) {
            // Stop timer
            isStart = false;
        } else {
            // Start timer
            isStart = true;
        }
    }
});

edited Jan 30 '18 at 14:13

Valentin Michalak

2,089
1
14
27

answered Jan 30 '18 at 13:38

eliamyro

308
1
4
20

score 0 · Answer 2 · answered Jan 30 '18 at 13:13

try this,

btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if(btn.getText().toString().equals("Start")){
            btn.setText("Stop");
            // start timer
        }else{
            btn.setText("Start");
            // stop timer
        }
    }
});

score 0 · Answer 3 · answered Jan 30 '18 at 13:34

0

on click (start/stop) button start the timer according to your code and return a value to button and when you click again that flag value can be used to create a if condition for stop as well as start

answered Jan 30 '18 at 13:34

Madhu Nair

428
1
7
20

score 0 · Answer 4 · answered Jan 30 '18 at 14:09

As you are starting and stopping a Timer with your button you can just check if the timer is running or not. I would suggest extending a TimerTask for that use case (I took that code from here):

public class YourTimerTask extends TimerTask {

    private boolean isRunning = false;

    @Overrides
    public void run() {
        this.isRunning = true;
        //rest of run logic here...
    }

    public boolean isRunning() {
        return this.isRunning;
    }
}

Then in your onClickListener you can just check if your timer is running or not:

startStopBtn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (yourTimer.isRunning()) {
            stopTimer();
        } else {
            startTimer();
        }
    }
});

how to set different onclicklisteners on same button click?

4 Answers4