Check if seekbar value is null or empty

Question

I am trying to check if the seekbar has value less than 0. Currently my seekbar has value between 0-9.

seekbar1 = (SeekBar)findViewById(R.id.sb);
seekbar1.setOnSeekBarChangeListener( new OnSeekBarChangeListener(){

    @Override
    public void onProgressChanged(SeekBar arg0, int progress, boolean arg2) {
        // TODO Auto-generated method stub

        tv.setText("" + progress);

    }

String str = tv.getText().toString();
int number = Integer.parseInt(str);

if(number >= 0){

// do something }

How can I check if number is less than 0? I tried doing if(number < 0) but it crashes. Thanks

 if(number >= 0){

// do something }

else{

//do something} // but it crashes

`SeekBar` never returns negative value or `null`. May I know why you set the text to `TextView` and then parse the value from it instead of directly use `SeekBar`'s value to do something? — Andrew T., Mar 26 '14 at 02:41
I want to check if the user has not selected the seekbar and it's value is not between 0 and 9, What's the right way to check that?Thanks — artist, Mar 26 '14 at 02:45
I suggest you to use one boolean (class variable ex. isChanged) and set it to true when seekbar change. Then simply if(isChanged){ } — Ketan Ahir, Mar 26 '14 at 04:14

score 0 · Accepted Answer · answered Mar 26 '14 at 04:09

0

This :

seekbar1.setOnSeekBarChangeListener( new OnSeekBarChangeListener(){

@Override
public void onProgressChanged(SeekBar arg0, int progress, boolean arg2) {
    // TODO Auto-generated method stub

    tv.setText("" + progress);

}

gets called when there is a change in the seek bar

and this:

String str = tv.getText().toString();
int number = Integer.parseInt(str);

if(number >= 0){

gets called immediately, regardless of whether there is a change in the seek bar or not,

hence, in order to ensure that the textview is not null then in that case, set the seekbar position to 0 in the onCreate right after you have initialized it.

Hope that helps.

answered Mar 26 '14 at 04:09

Rat-a-tat-a-tat Ratatouille

7,109
5
31
41

Where can I set the minimum value of seekbar to 0?Thanks – artist Mar 26 '14 at 04:41
you could add `android:progress="0"` to the manifest, or in the onCreate after initialization write `seekbar.setProgress(0)` – Rat-a-tat-a-tat Ratatouille Mar 26 '14 at 04:43
When I set seekbar1.setprogress(0) right after initialization in the oncreate method, app. crashes. Any ideas?Thanks – artist Mar 26 '14 at 14:21
Please disregard my above comment. I had not worked with seekbars before so was having difficulty with understanding them. You are right the way to get seekbar value is with getProgress().Thanks for helping me – artist Mar 26 '14 at 14:52
@artist no worries. Good you found the solution and learnt :) . – Rat-a-tat-a-tat Ratatouille Mar 27 '14 at 01:30

Check if seekbar value is null or empty

1 Answers1