ImageButton添加按下的动画效果变亮或变暗

最新推荐文章于 2021-10-03 15:06:13 发布

原创最新推荐文章于 2021-10-03 15:06:13 发布 · 900 阅读

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#Android

本文介绍了在Android中为ImageButton添加按压效果的方法，包括使用颜色矩阵实现按键变亮和变暗的特效，无需额外的按下效果图片。通过设置OnTouchListener并应用TouchLight和TouchDark监听器，可以轻松实现这一功能。

Android中使用ImageButton的话，程序里按下那个ImageButton时感觉不到任何按下的效果。

网上有2中经典的解决方案，一种是使用xml，一种是写在代码里。

这里我想要介绍另一种方法，使ImageButton有按下的特效，只需要准备一张普通的图片，不需要按下效果的图片。

直接看示例代码，创建 TouchLight 和 TouchDark 这两个 OnTouchListener，然后给 ImageButton 设置OnTouchListener就行了，如果使用TouchLight，则按下效果是按键变亮；另一个就是变暗。

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import android.app.Activity;

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import android.graphics.ColorMatrixColorFilter;

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import android.view.MotionEvent;

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import android.view.View;

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import android.view.View.OnTouchListener;

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public class TouchedAnimation extends Activity
 {

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    public static final OnTouchListener
 TouchLight = new OnTouchListener() {

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        public final float[]
 BT_SELECTED = new float[] {1,0,0,0,50,0,1,0,0,50,0,0,1,0,50,0,0,0,1,0};

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        public final float[]
 BT_NOT_SELECTED = new float[] {1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0};

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        @Override

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        public boolean onTouch(View
 v, MotionEvent event) {

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            if (event.getAction() == MotionEvent.ACTION_DOWN) {

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                v.getBackground().setColorFilter(

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                        new ColorMatrixColorFilter(BT_SELECTED));

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                v.setBackgroundDrawable(v.getBackground());

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            } else if (event.getAction()
 == MotionEvent.ACTION_UP) {

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                v.getBackground().setColorFilter(

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                        new ColorMatrixColorFilter(BT_NOT_SELECTED));

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                v.setBackgroundDrawable(v.getBackground());

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            }

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            return false;

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        }

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    };

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    public static final OnTouchListener
 TouchDark = new OnTouchListener() {

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        public final float[]
 BT_SELECTED = new float[] {1,0,0,0,-50,0,1,0,0,-50,0,0,1,0,-50,0,0,0,1,0};

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        public final float[]
 BT_NOT_SELECTED = new float[] {1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0};

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        @Override

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        public boolean onTouch(View
 v, MotionEvent event) {

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            if (event.getAction() == MotionEvent.ACTION_DOWN) {

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                v.getBackground().setColorFilter(

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                        new ColorMatrixColorFilter(BT_SELECTED));

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                v.setBackgroundDrawable(v.getBackground());

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            } else if (event.getAction()
 == MotionEvent.ACTION_UP) {

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                v.getBackground().setColorFilter(

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                        new ColorMatrixColorFilter(BT_NOT_SELECTED));

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                v.setBackgroundDrawable(v.getBackground());

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            }

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            return false;

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        }

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    };

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        @Override

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    public void onCreate(Bundle
 savedInstanceState) {

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        super.onCreate(savedInstanceState);

52
        setContentView(R.layout.main);

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        ImageButton ib1, ib2;

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                ib1 = (ImageButton) findViewById(R.id.ImageButton01);

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                ib2 = (ImageButton) findViewById(R.id.ImageButton02);

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                ib1.setOnTouchListener(TouchLight);

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                ib2.setOnTouchListener(TouchDark);

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    }

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}