在按钮上应用滤色镜 [英] Apply color filter on button

问题描述

我有很多按钮有很多不同的背景颜色。我想知道是否有一种方法来应用一些点击的颜色过滤器。例如，我想让我的所有按钮变得更暗点击。

I have a lot of button with a lot of different background colors. I want to know if there is a way to apply some color filter on click. For example, i want that all my buttons become darker on click. They keep the original color, but it's darker.

有没有简单的方法，或者我必须为每个按钮定义更深的颜色？

Is there an easy way to do it, or i have to define the darker color for each button?

感谢。

推荐答案

我假设您希望按钮在触摸时变暗，当用户释放按钮时恢复正常。

I assume you want the button to darken on touch, and revert to normal when the user releases the button.

我建议您为自己的工作创建一个自定义按钮：

I would suggest creating a custom button which does the work for you:

import android.content.Context;
import android.graphics.LightingColorFilter;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.Button;

public class DarkenButton extends Button {

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

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

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            // darken background
            getBackground().setColorFilter(
                    new LightingColorFilter(0xff888888, 0x000000));
            break;

        case MotionEvent.ACTION_UP:
            // clear color filter
            getBackground().setColorFilter(null);
            break;
        }
        return super.onTouchEvent(event);
    }

}

然后使用DarkenButton使用Button。

Then use DarkenButton anywhere you would normally use a Button.

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