SAutoBgButtonBackgroundDrawable.java

package com.hkm.ui.processbutton.Util;

import android.graphics.drawable.LayerDrawable;

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.Button;

/**
 * Created by hesk on 16/10/15.
 */
public 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;
    }
}