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); } }