android - Custom Seekbar with masking effect with two drawables? -

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i using custom seekbar show graph. had done till this. showing graph applying background drawable seekbar. problem is, need set blue 1 progress drawable , need set background of seekbar red graph. when progress happens thumb moves on red area thumb passed should changed blue color masking effect. can 1 tell best possible way this. pictures shown below secondary progressbackground

after reading questions , answers hope should scenario thing done...

1.create 2 graphs per logic.

2.generate 2 drwables particular bitmaps....

drawable g_bg = new bitmapdrawable(red graph bitmap); drawable g_pg = new bitmapdrawable(blue graph bitmap);

3.and customize seek bar using layer list created through java code.

clipdrawable c=new clipdrawable(g_pg, gravity.left,clipdrawable.horizontal); layerdrawable ld =new layerdrawable (new drawable[]{g_bg,c});

4.apply layer list seekbar.

graphbar.setprogressdrawable(ld);

this should work wanted....thanksss


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