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View background color animation

/ Published in: Java
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  1. import android.graphics.drawable.ColorDrawable;
  2. import android.graphics.drawable.Drawable;
  3. import android.graphics.drawable.TransitionDrawable;
  4.  
  5. public class BGColorTransitionDrawable extends TransitionDrawable {
  6.         private int interval;
  7.         public BGColorTransitionDrawable(Drawable[] layers) {
  8.                 super(layers);
  9.                 interval = 500;
  10.                 initVars();
  11.         }
  12.         public BGColorTransitionDrawable(Drawable[] layers, int interval) {
  13.                 super(layers);
  14.                 this.interval = interval;
  15.                 initVars();
  16.         }
  17.         private void initVars(){
  18.                 setCrossFadeEnabled(true);
  19.                 setId(0,0);
  20.                 setId(1,1);
  21.         }
  22.         public void changeColor(int color){
  23.                 setDrawableByLayerId(0, getDrawable(1));
  24.                 setDrawableByLayerId(1, new ColorDrawable(color));
  25.                 startTransition(interval);
  26.         }
  27.  
  28. }
  29.  
  30. I set and call it like so.
  31.  
  32.                 ColorDrawable layers[] = new ColorDrawable[2];
  33.                 layers[0] = new ColorDrawable(0xff0000ff);
  34.                 layers[1] = new ColorDrawable(0xffff0000);
  35.                 backgroundColorAnimation = new BGColorTransitionDrawable(layers);
  36.                 vColorSwapper.setBackgroundDrawable(backgroundColorAnimation);
  37.  
  38.                 backgroundColorAnimation.setColor(0xff00ff00);

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