Answers
颜色过滤矩阵是一个4x5的矩阵， 四行分别是 红色通道值，绿色通道值，蓝色通道值和alpha通道值。五列分别是 对应通道的红色值，绿色值，蓝色值，alpha值和偏移量。
RGB和Alpha的终值计算方法如下：
Red通道终值 = a[0] * srcR + a[1] * srcG + a[2] * srcB + a[3] * srcA + a[4]
Green通道终值 = a[5] * srcR + a[6] * srcG + a[7] * srcB + a[8] * srcA + a[9]
Blue通道终值 = a[10] * srcR + a[11] * srcG + a[12] * srcB + a[13] * srcA + a[14]
Alpha通道终值 = a[15] * srcR + a[16] * srcG + a[17] * srcB + a[18] * srcA + a[19]
/**
* 按钮被按下
*/
private final static float[] BUTTON_PRESSED = new float[] {
2.0f, 0, 0, 0, -50,
0, 2.0f, 0, 0, -50,
0, 0, 2.0f, 0, -50,
0, 0, 0, 5, 0 };
/**
* 按钮恢复原状
*/
private final static float[] BUTTON_RELEASED = new float[] {
1, 0, 0, 0, 0,
0, 1, 0, 0, 0,
0, 0, 1, 0, 0,
0, 0, 0, 1, 0 };
private static final OnTouchListener touchListener = new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_DOWN) {
v.getBackground().setColorFilter(new ColorMatrixColorFilter(BUTTON_PRESSED));
v.setBackgroundDrawable(v.getBackground());
}else if(event.getAction() == MotionEvent.ACTION_UP) {
v.getBackground().setColorFilter(new ColorMatrixColorFilter(BUTTON_RELEASED));
v.setBackgroundDrawable(v.getBackground());
}
return false;
}
};
public static void setButtonStateChangeListener(View v) {
v.setOnTouchListener(touchListener);
}
samshen
answered 12 years, 5 months ago