Android实现局部图片滑动指引效果

　　// 滑动页面更改事件监听器
private class ImagePageChangeListener implements OnPageChangeListener {
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub

}

@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub

}

@Override
public void onPageSelected(int index) {
pageIndex = index;
slideLayout.setPageIndex(index);
tvSlideTitle.setText(parser.getSlideTitles()[index]);

for (int i = 0; i < imageCircleViews.length; i++) {
imageCircleViews[index].setBackgroundResource(R.drawable.dot_selected);

if (index != i) {
imageCircleViews[i].setBackgroundResource(R.drawable.dot_none);
}
}
}
}

package com.image.indicator.control;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.ScrollView;

/**
* 能够兼容ViewPager的ScrollView
* @Description: 解决了ViewPager在ScrollView中的滑动反弹问题

* @File: ViewPagerCompatScrollView.java

* @Package com.image.indicator.control

* @Author Hanyonglu

* @Date 2012-6-18 下午01:34:50

* @Version V1.0
*/
public class ScrollViewExtend extends ScrollView {
// 滑动距离及坐标
private float xDistance, yDistance, xLast, yLast;

public ScrollViewExtend(Context context, AttributeSet attrs) {
super(context, attrs);
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
xDistance = yDistance = 0f;
xLast = ev.getX();
yLast = ev.getY();
break;
case MotionEvent.ACTION_MOVE:
final float curX = ev.getX();
final float curY = ev.getY();

xDistance += Math.abs(curX - xLast);
yDistance += Math.abs(curY - yLast);
xLast = curX;
yLast = curY;

if(xDistance > yDistance){
return false;
}
}

return super.onInterceptTouchEvent(ev);
}
}