ThemeImageView.java

package com.campus.prime.ui.view;

import android.content.Context;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.LightingColorFilter;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.LayerDrawable;
import android.util.AttributeSet;
import android.widget.ImageView;

public class ThemeImageView extends ImageView {

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

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

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

  @Override
  public void setBackgroundDrawable(Drawable d) {
      // Replace the original background drawable (e.g. image) with a
      // LayerDrawable that
      // contains the original drawable.
      SAutoBgButtonBackgroundDrawable layer = new SAutoBgButtonBackgroundDrawable(d);
      super.setBackgroundDrawable(layer);
  }

  protected class SAutoBgButtonBackgroundDrawable extends LayerDrawable {

      // The color filter to apply when the button is pressed
      protected ColorFilter _pressedFilter = new LightingColorFilter(Color.LTGRAY, 1);
      // Alpha value when the button is disabled
      protected int _disabledAlpha = 100;

      public SAutoBgButtonBackgroundDrawable(Drawable d) {
          super(new Drawable[] { d });
      }

      @Override
      protected boolean onStateChange(int[] states) {
          boolean enabled = false;
          boolean pressed = false;

          for (int state : states) {
              if (state == android.R.attr.state_enabled)
                  enabled = true;
              else if (state == android.R.attr.state_pressed)
                  pressed = true;
          }

          mutate();
          if (enabled && pressed) {
              setColorFilter(_pressedFilter);
          } else if (!enabled) {
              setColorFilter(null);
              setAlpha(_disabledAlpha);
          } else {
              setColorFilter(null);
          }

          invalidateSelf();

          return super.onStateChange(states);
      }

      @Override
      public boolean isStateful() {
          return true;
      }
  }
}