ImageButton添加按下的动画效果 变亮或变暗

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。

 

01import android.app.Activity;

02import android.graphics.ColorMatrixColorFilter;

03import android.view.MotionEvent;

04import android.view.View;

05import android.view.View.OnTouchListener;

06  

07public class TouchedAnimation extends Activity {

08      

09    public static final OnTouchListener TouchLight = new OnTouchListener() {

10  

11        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};

12        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};

13  

14        @Override

15        public boolean onTouch(View v, MotionEvent event) {

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

17                v.getBackground().setColorFilter(

18                        new ColorMatrixColorFilter(BT_SELECTED));

19                v.setBackgroundDrawable(v.getBackground());

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

21                v.getBackground().setColorFilter(

22                        new ColorMatrixColorFilter(BT_NOT_SELECTED));

23                v.setBackgroundDrawable(v.getBackground());

24            }

25            return false;

26        }

27    };

28      

29    public static final OnTouchListener TouchDark = new OnTouchListener() {

30          

31        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};

32        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};

33          

34        @Override

35        public boolean onTouch(View v, MotionEvent event) {

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

37                v.getBackground().setColorFilter(

38                        new ColorMatrixColorFilter(BT_SELECTED));

39                v.setBackgroundDrawable(v.getBackground());

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

41                v.getBackground().setColorFilter(

42                        new ColorMatrixColorFilter(BT_NOT_SELECTED));

43                v.setBackgroundDrawable(v.getBackground());

44            }

45            return false;

46        }

47    };

48  

49        @Override

50    public void onCreate(Bundle savedInstanceState) {

51        super.onCreate(savedInstanceState);

52        setContentView(R.layout.main);

53  

54        ImageButton ib1, ib2;

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

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

57  

58                ib1.setOnTouchListener(TouchLight);

59                ib2.setOnTouchListener(TouchDark);

60    }

61}

代码里的两个 float 数组里存的东西是颜色矩阵，不了解颜色矩阵也没关系，使用这个附件就行，只需调整亮度、对比度之类的值，然后把生产的颜色矩阵复制到代码里。