android之ScrollView里嵌套ScrollView(转)

大家好，众所周知，android 里两个相同方向的ScrollView是不能嵌套的，那要是有这样的需求怎么办？（这个需求一般都是不懂android的人提出来的）
难道就真的不能嵌套吗？ 当然可以，只要你再写一个ScrollView，在里面做点脚，它就支持嵌套了。
目前做的这个只支持两个ScrollView嵌套，两个以上还有待改进，能套两个就已经能满足很多需求了，呵呵，另外现在只做了纵向scrollview的支持，横向的还没来的急做哦。
效果截图： <ignore_js_op>

2012-12-20 18:13 上传

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先上核心代码吧。代码里头我加了注释，方便大家阅读

package com.sun.shine.study.innerscrollview.view;
 
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ScrollView;
 
public class InnerScrollView extends ScrollView {
 
    /**
     */
    public ScrollView parentScrollView;
 
    public InnerScrollView(Context context, AttributeSet attrs) {
        super(context, attrs);
 
    }
 
    private int lastScrollDelta = 0;
 
    public void resume() {
        overScrollBy(0, -lastScrollDelta, 0, getScrollY(), 0, getScrollRange(), 0, 0, true);
        lastScrollDelta = 0;
    }
 
    int mTop = 10;
 
    /**
     * 将targetView滚到最顶端
     */
    public void scrollTo(View targetView) {
 
        int oldScrollY = getScrollY();
        int top = targetView.getTop() - mTop;
        int delatY = top - oldScrollY;
        lastScrollDelta = delatY;
        overScrollBy(0, delatY, 0, getScrollY(), 0, getScrollRange(), 0, 0, true);
    }
 
    private int getScrollRange() {
        int scrollRange = 0;
        if (getChildCount() > 0) {
            View child = getChildAt(0);
            scrollRange = Math.max(0, child.getHeight() - (getHeight()));
        }
        return scrollRange;
    }
 
    int currentY;
 
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if (parentScrollView == null) {
            return super.onInterceptTouchEvent(ev);
        } else {
            if (ev.getAction() == MotionEvent.ACTION_DOWN) {
                // 将父scrollview的滚动事件拦截
                currentY = (int)ev.getY();
                setParentScrollAble(false);
                return super.onInterceptTouchEvent(ev);
            } else if (ev.getAction() == MotionEvent.ACTION_UP) {
                // 把滚动事件恢复给父Scrollview
                setParentScrollAble(true);
            } else if (ev.getAction() == MotionEvent.ACTION_MOVE) {
            }
        }
        return super.onInterceptTouchEvent(ev);
 
    }
 
    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        View child = getChildAt(0);
        if (parentScrollView != null) {
            if (ev.getAction() == MotionEvent.ACTION_MOVE) {
                int height = child.getMeasuredHeight();
                height = height - getMeasuredHeight();
 
                // System.out.println("height=" + height);
                int scrollY = getScrollY();
                // System.out.println("scrollY" + scrollY);
                int y = (int)ev.getY();
 
                // 手指向下滑动
                if (currentY < y) {
                    if (scrollY <= 0) {
                        // 如果向下滑动到头，就把滚动交给父Scrollview
                        setParentScrollAble(true);
                        return false;
                    } else {
                        setParentScrollAble(false);
 
                    }
                } else if (currentY > y) {
                    if (scrollY >= height) {
                        // 如果向上滑动到头，就把滚动交给父Scrollview
                        setParentScrollAble(true);
                        return false;
                    } else {
                        setParentScrollAble(false);
 
                    }
 
                }
                currentY = y;
            }
        }
 
        return super.onTouchEvent(ev);
    }
 
    /**
     * 是否把滚动事件交给父scrollview
     * 
     * @param flag
     */
    private void setParentScrollAble(boolean flag) {
 
        parentScrollView.requestDisallowInterceptTouchEvent(!flag);
    }
 
}

转载于：http://www.eoeandroid.com/thread-240709-1-1.html