import java.lang.reflect.Field;
import java.lang.reflect.Method;
/**
* 解决ScrollView嵌套ViewPager，导致ViewPager不能滑动的问题
*/
public
class CustomScrollView extends ScrollView {
private GestureDetector
mGestureDetector;
private
int
Scroll_height = 0;
private
int
view_height = 0;
protected Field
scrollView_mScroller;
private
static final String
TAG =
"CustomScrollView";
public CustomScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
mGestureDetector =
new GestureDetector(context,
new YScrollDetector());
setFadingEdgeLength(0);
}
@Override
public
boolean onInterceptTouchEvent(MotionEvent ev) {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
stopAnim();
}
boolean ret =
super.onInterceptTouchEvent(ev);
boolean ret2 =
mGestureDetector.onTouchEvent(ev);
return ret && ret2;
}
class YScrollDetector
extends SimpleOnGestureListener {
@Override
public
boolean onScroll(MotionEvent e1, MotionEvent e2,
float distanceX,
float distanceY) {
if (Math.abs(distanceY) > Math.abs(distanceX)) {
return
true;
}
return
false;
}
}
@Override
protected
void onScrollChanged(int l,
int t,
int oldl, int oldt) {
boolean stop =
false;
if (Scroll_height -
view_height == t) {
stop = true;
}
if (t == 0 || stop ==
true) {
try {
if (scrollView_mScroller ==
null) {
scrollView_mScroller =
getDeclaredField(this,
"mScroller");
}
Object ob = scrollView_mScroller.get(this);
if (ob ==
null || !(ob
instanceof Scroller)) {
return;
}
Scroller sc = (Scroller) ob;
sc.abortAnimation();
} catch (Exception e) {
Log.e(TAG, e.getMessage());
}
}
super.onScrollChanged(l, t, oldl, oldt);
}
private
void stopAnim() {
try {
if (scrollView_mScroller ==
null) {
scrollView_mScroller =
getDeclaredField(this,
"mScroller");
}
Object ob = scrollView_mScroller.get(this);
if (ob ==
null) {
return;
}
Method method = ob.getClass().getMethod("abortAnimation");
method.invoke(ob);
} catch (Exception ex) {
Log.e(TAG, ex.getMessage());
}
}
@Override
protected
int computeVerticalScrollRange() {
Scroll_height =
super.computeVerticalScrollRange();
return
Scroll_height;
}
@Override
protected
void onLayout(boolean changed,
int l,
int t, int r,
int b) {
super.onLayout(changed, l, t, r, b);
if (changed ==
true) {
view_height = b - t;
}
}
@Override
public
void requestChildFocus(View child, View focused) {
if (focused !=
null && focused
instanceof WebView) {
return;
}
super.requestChildFocus(child, focused);
}
/**
* 获取一个对象隐藏的属性，并设置属性为public属性允许直接访问
*
* @return
{@link Field} 如果无法读取，返回null；返回的Field需要使用者自己缓存，本方法不做缓存
*/
public
static Field getDeclaredField(Object object, String field_name) {
Class<?> cla = object.getClass();
Field field = null;
for (; cla != Object.class; cla = cla.getSuperclass()) {
try {
field = cla.getDeclaredField(field_name);
field.setAccessible(true);
return field;
} catch (Exception e) {
}
}
return
null;
}
}