Changing step values in seekbar?

Question

I have a seekbar, while moving it I want to change values from 0 to 200. I have a TextView, where I display those values while moving the seekbar. But I don\'t want to have

Answer 1

The easieset way I can think of, is simply defining:

SeekBar yourSeekBar = (SeekBar)findViewById(R.id.yourSeekBarId);
yourSeekbar.setMax(20);

Next, override those methods (the empty methods are also required, even if they are empty):

yourSeekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {          
        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {

        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {

        }

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
            if (fromUser) {
                if (progress >= 0 && progress <= sizeSeekBar.getMax()) {                        

                    String progressString = String.valueOf(progress * 10);
                    yourTextView.setText(progressString); // the TextView Reference
                    seekBar.setSecondaryProgress(progress);
                }
            }

        }
    });

The idea is to only define 20 values for the seekbar, but always multiply the value by 10 and display that value. If you do not really need 200 values, then there is no point in using 200 values.

Answer 2

Use the Slider in Material Components Library using the android:stepSize attribute:

    <com.google.android.material.slider.Slider
        android:valueFrom="0"
        android:valueTo="200"
        android:stepSize="10"
       ..>

Answer 3

use Math.round function

fun round(n: Int): Int {
    // Smaller multiple
    val a = n / 10 * 10
    // Larger multiple
    val b = a + 10
    // Return of closest of two
    return if (n - a > b - n) b else a
}

Answer 4

You can also achieve this by defining custom SeekBar class as below

public class CustomSeekBar extends AppCompatSeekBar {


int SEEKBAR_MULTIPLIER = 1;

public CustomSeekBar(Context context) {
    super(context);
}

public CustomSeekBar(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public CustomSeekBar(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
}

public void setSeekBarConfig( int SEEKBAR_MULTIPLIER, int SEEKBAR_MAX){
    setMax(SEEKBAR_MAX);
    this.SEEKBAR_MULTIPLIER = SEEKBAR_MULTIPLIER;
}

@Override
public int getProgress() {
    return super.getProgress() * SEEKBAR_MULTIPLIER;
}
}

And can use by following manner

 CustomSeekBar mCustomSeekBar = (CustomSeekBar) findViewById(R.id.customSeekBar);
 mSeekBar.setSeekBarConfig(10,20);

In xml you should add CustomSeekBar instead of SeekBar

<*.CustomSeekBar
    com.quemb.qmbform.view:setSeekBarConfig="10"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/seekBar" />

So that you can reuse the custom seekBar in entire App with out repeating whole extra calculation.

Answer 5

You should use the SeekBar.OnSeekBarChangeListener for tracking the progress change. Call mseek.setMax(200). Do a modulo operation on the current value to decide if the textview should be updated or not.

SeekBar.OnSeekBarChangeListener() {

    void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        if (progress % 10 == 0) {
            textview.setText(""+progress);
        }
    }
}

Answer 6

for the minimum issue, you can set an offset on your progress. This way, the user can't go under your minimal value.

int offset = 10;

seekBar seekBar = (SeekBar)layout.findViewById(R.id.seekbar);
seekBar.setProgress(0);
seekBar.setMax(190); //with the offset, you need to adapt the max value
TextView seekBarValue = (TextView)layout.findViewById(R.id.seekbarvalue);
seekBarValue.setText(""+(seekBar.getProgress() + offset));

seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener(){

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        progress += offset;

        seekBarValue.setText(String.valueOf(progress));
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {

    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {

    }
});