android開發步步為營之65:解決ScrollView和ListView觸摸事件onInterceptTouchEvent相互衝突問題，

android開發步步為營之65:解決ScrollView和ListView觸摸事件onInterceptTouchEvent相互衝突問題，

         最近項目裡面有個需求，一個頁面放了一個ScrollView，整個頁面可以向上滾動，然後ScrollView裡面又嵌套了一個ListView，ListView裡面的資料也是可以上下滑動的，理論上ListView被包在ScrollView裡面，TouchEvent肯定是被ScrollView攔截了，那我們可以採取什麼思路呢，我看網上很多做法說是將整個ListView的高度計算出來，感覺這樣很不優雅，如果ListView資料超多，那麼頁面不是超長嗎？其中一個思路就是當我們滑動ListView地區的時候，ScrollView不要響應OnTouch事件。觸摸ListView地區外的點才可以滑動整個頁面。給出核心代碼。

        自訂ScrollView

package com.figo.study.view;import java.util.ArrayList;import java.util.List;import android.content.Context;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.widget.ScrollView;public class MyScrollView extends ScrollView {    private OnScrollListener onScrollListener;    private List<View> views = new ArrayList<View>();    public MyScrollView(Context context) {        this(context, null);    }    public MyScrollView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public MyScrollView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);    }    public void setOnScrollListener(OnScrollListener onScrollListener) {        this.onScrollListener = onScrollListener;    }    @Override    protected void onScrollChanged(int l, int t, int oldl, int oldt) {        super.onScrollChanged(l, t, oldl, oldt);        if (onScrollListener != null) {            onScrollListener.onScroll(t);        }    }    public interface OnScrollListener {        public void onScroll(int scrollY);    }    //是否攔截觸摸事件    @Override    public boolean onInterceptTouchEvent(MotionEvent ev) {        if (views != null && checkAllViews(views, ev)) {            return false;        }        return super.onInterceptTouchEvent(ev);    }    public void addUnTouchableView(View view) {        try {            if (!views.contains(view)) {                views.add(view);            }        } catch (Exception e) {            if (e != null) {                e.printStackTrace();            }        }    }    public void delUnTouchableView(View view) {        try {            if (views.contains(view)) {                views.remove(view);            }        } catch (Exception e) {            if (e != null) {                e.printStackTrace();            }        }    }    public void delAllUnTouchableView() {        try {            if (views.size() > 0) {                views.clear();            }        } catch (Exception e) {            if (e != null) {                e.printStackTrace();            }        }    }    private boolean checkAllViews(List<View> views, MotionEvent event) {        for (View view : views) {            if (checkInLvArea(view, event)) {                return true;            }        }        return false;    }    private boolean checkInLvArea(View v, MotionEvent event) {        try {            float x = event.getRawX();            float y = event.getRawY();            int[] locate = new int[2];            v.getLocationOnScreen(locate);            int l = locate[0];            int r = l + v.getWidth();            int t = locate[1];            int b = t + v.getHeight();            if (l < x && x < r && t < y && y < b) {                return true;            }            return false;        } catch (Exception e) {            if (e != null) {                e.printStackTrace();            }        }        return false;    }}

           滑動ScrollView後，顯示新的頁面head的技巧：

        

        MyScrollView scrollView = (MyScrollView) findViewById(R.id.scrollView);        scrollView.setOnScrollListener(new OnScrollListener() {                        @Override            public void onScroll(int scrollY) {                                int top = Math.max(scrollY, mLayoutHead.getTop()/2);                mLayoutHeadNew.layout(0, top, mLayoutHeadNew.getWidth(), top + mLayoutHeadNew.getHeight());                 if(scrollY>=canScrollHeight)                 {//                     mLayoutHead.setVisibility(View.GONE);                     mLayoutHeadNew.setVisibility(View.VISIBLE);                 }else                 {//                     mLayoutHead.setVisibility(View.VISIBLE);                     mLayoutHeadNew.setVisibility(View.GONE);                 }            }        });