Android ViewPager被嵌套在ScrollView中不显示的问题的解决方案

解决方案：

1.设置ScrollView的fillViewPort为true

2.重写ScrollView，然后嵌套使用无任何问题，如何重写，具体看以下地址

http://stackoverflow.com/questions/2646028/android-horizontalscrollview-within-scrollview-touch-handling

如果 ViewPager左右不能滑动了，需要重写ScrollView，具体如下

自定一个类继承ScrollView 

    /**
 * 自定义ScrollView，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;
}


// Return false if we're scrolling in the x direction
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;
}


}