前言

安卓的按压效果的传统方式是shape.xml文件，不过如果当项目比较多按钮都需要自定义按压效果的话，shape.xml的数量可是非常头疼的（即使是ctrl c+ ctrlv），故此可以采用动态方式进行按压效果的实现。

上代码

/**
* 
* @param RADIUS
*            角度
* @param normalFileName
*            正常颜色
* @param pressFileName
*            点击颜色
* @param type
*            -1:left 0:center 1:right 2:四角圆角
* @return
*/
public static StateListDrawable addDrawable(int RADIUS, int normalFileName,
int pressFileName, int type) {
StateListDrawable sd = new StateListDrawable();


if (RADIUS != 0) {
float[] float1 = null;


if (type == -1) {
float1 = new float[] { 0, 0, 0, 0, 0, 0, RADIUS, RADIUS };


} else if (type == 0) {
float1 = new float[] { 0, 0, 0, 0, 0, 0, 0, 0 };


} else if (type == 1) {
float1 = new float[] { 0, 0, 0, 0, RADIUS, RADIUS, 0, 0 };


} else if (type == 2) { // 设置四个角为圆角
float1 = new float[] { RADIUS, RADIUS, RADIUS, RADIUS, RADIUS,
RADIUS, RADIUS, RADIUS };


} else {
float1 = new float[] { 0, 0, 0, 0, RADIUS, RADIUS, RADIUS,
RADIUS };
}


GradientDrawable gd = new GradientDrawable();
gd.setCornerRadii(float1);
gd.setColor(normalFileName);
GradientDrawable gd2 = new GradientDrawable();
gd2.setCornerRadii(float1);
gd2.setColor(pressFileName);


int pressed = android.R.attr.state_pressed;
int window_focused = android.R.attr.state_window_focused;
int focused = android.R.attr.state_focused;
int selected = android.R.attr.state_selected;
sd.addState(new int[] { pressed, window_focused }, gd2);
sd.addState(new int[] { pressed, -focused }, gd2);
sd.addState(new int[] { selected }, gd2);
sd.addState(new int[] { focused }, gd2);
sd.addState(new int[] {}, gd);
return sd;


} else {
GradientDrawable gd = new GradientDrawable();
gd.setColor(normalFileName);
GradientDrawable gd2 = new GradientDrawable();
gd2.setColor(pressFileName);
int pressed = android.R.attr.state_pressed;
int window_focused = android.R.attr.state_window_focused;
int focused = android.R.attr.state_focused;
int selected = android.R.attr.state_selected;
sd.addState(new int[] { pressed, window_focused }, gd2);
sd.addState(new int[] { pressed, -focused }, gd2);
sd.addState(new int[] { selected }, gd2);
sd.addState(new int[] { focused }, gd2);
sd.addState(new int[] {}, gd);
return sd;
}


}

小结

小建议，建一个获取不同按压效果的管理类，这样就可以统一入口替换资源图片了。欢迎各位大神有更好的做法分享到评论区~