Android ImageView 点击变色

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public classFilterImageViewextendsandroid.support.v7.widget.AppCompatImageView {
publicFilterImageView(Context context) {
super(context);
}
publicFilterImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
publicFilterImageView(Context context, AttributeSet attrs,intdefStyleAttr) {
super(context, attrs, defStyleAttr);
}



/**

* 设置滤镜

*/

private voidsetFilter() {

//先获取设置的src图片

Drawable drawable = getDrawable();

//当src图片为Null，获取背景图片

if(drawable ==null) {

drawable = getBackground();

}

if(drawable !=null) {

//设置滤镜

drawable.setColorFilter(Color.GRAY, PorterDuff.Mode.MULTIPLY);

}

}

/**

* 清除滤镜

*/

private voidremoveFilter() {

//先获取设置的src图片

Drawable drawable = getDrawable();

//当src图片为Null，获取背景图片

if(drawable ==null) {

drawable = getBackground();

}

if(drawable !=null) {

//清除滤镜

drawable.clearColorFilter();

}

}

@Override

protected voiddrawableStateChanged() {

super.drawableStateChanged();

updateFilter();

}

private voidupdateFilter(){

if(isPressed()){

setFilter();

}else{

removeFilter();

}

}

}