永久告别Android的背景选择器Selector！无需切很多图了！

package com.zoke.custom.autobg;

 

import android.content.Context;

import android.content.res.TypedArray;

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.util.Log;

import android.widget.Button;

 

import com.zoke.custom.R;

 

/**

 * Android按钮显示不同状态无需多张图片的自定义控件

 * 

 * @author Jack 2014-2-8

 * 

 * 

 */

public class AutoBgButton extends Button {

 

        public AutoBgButton(Context context) {

                super(context);

        }

 

        public AutoBgButton(Context context, AttributeSet attrs) {

                super(context, attrs);

        }

 

        public AutoBgButton(Context context, AttributeSet attrs, int defStyle) {

                super(context, attrs, defStyle);

        }

        @Override

        public void setBackgroundDrawable(Drawable d) {

                // 替换背景图

                AutoBgButtonBackgroundDrawable layer = new AutoBgButtonBackgroundDrawable(

                                d);

                super.setBackgroundDrawable(layer);

        }

 

        /**

         * 按钮所使用的状态图

         */

        protected class AutoBgButtonBackgroundDrawable extends LayerDrawable {

 

                // 按钮按下时所使用的颜色过滤器

                protected ColorFilter _pressedFilter = new LightingColorFilter(

                                getContext().getResources().getColor(R.color.pressColor), 1);

                // 按钮被禁用时的alpha值

                protected int _disabledAlpha = 100;

 

                public AutoBgButtonBackgroundDrawable(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;

                }

        }

 

}

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