Sm快遞櫃-給圖片設置點擊下去顏色變深

package com.hatai.smartlokey.utils.image;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.ColorMatrixColorFilter;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * Created by administrato on 2017/10/5.
 */

@SuppressLint("AppCompatCustomView")
public class MaskableImageView extends ImageView
{
    private boolean touchEffect = true;
    public final float[] BG_PRESSED = new float[] { 1, 0, 0, 0, -50, 0, 1,
            0, 0, -50, 0, 0, 1, 0, -50, 0, 0, 0, 1, 0 };
    public final float[] BG_NOT_PRESSED = new float[] { 1, 0, 0, 0, 0, 0,
            1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0 };

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

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

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

    @Override
    public void setPressed(boolean pressed) {
        System.out.println("setPressed");
        updateView(pressed);
        super.setPressed(pressed);
    }

    /**
     * 根據是否按下去來刷新bg和src
     */
    private void updateView(boolean pressed){
        System.out.println("updateView");
        //若是沒有點擊效果
        if( !touchEffect ){
            return;
        }//end if
        if( pressed ){//點擊
            /**
             * 經過設置濾鏡來改變圖片亮度
             */
            this.setDrawingCacheEnabled(true);
            this.setColorFilter( new ColorMatrixColorFilter(BG_PRESSED) ) ;
            this.getBackground().setColorFilter( new ColorMatrixColorFilter(BG_PRESSED) );
        }else{//未點擊
            this.setColorFilter( new ColorMatrixColorFilter(BG_NOT_PRESSED) ) ;
            this.getBackground().setColorFilter(
                    new ColorMatrixColorFilter(BG_NOT_PRESSED));
        }
    }
}