Question

I’m trying to toggle a SeekBar between the the two modes to display the state of streaming media.

I’ve established that the correct graphics show when defining the android:indeterminate tag in XML:

<SeekBar
    android:id="@+id/seekBar1"
    android:indeterminate="false"
    android:progressDrawable="@android:drawable/progress_horizontal"
    android:indeterminateDrawable="@android:drawable/progress_indeterminate_horizontal"
    android:indeterminateBehavior="cycle"
    android:indeterminateOnly="false"
    android:progress="33"
    android:secondaryProgress="66"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"></SeekBar>

The trouble is, when trying to switch by calling setIndeterminate(true), the drawables don’t appear to change properly. In the case of indeterminate->determinate, the animation stops, and from determinate->indeterminate, nothing happens.

What am I doing wrong?

Answer 1

The SeekBar onSizeChanged() initializes only the current selected background drawable, and it is called once when the SeekBar is initialized.
So a fix might be:

public class CorrectedSeekBar extends SeekBar {

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

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

    public CorrectedSeekBar(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        boolean current = isIndeterminate();
        setIndeterminate(!current);
        super.onSizeChanged(w, h, oldw, oldh);
        setIndeterminate(current);
        super.onSizeChanged(w, h, oldw, oldh);
    }

}

And in the layout xml use <yourpackage.CorrectedSeekBar ...

This doesnt look nice, other workarounds might be possible but I think this is the main problem (bug?).