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

         近期項目裏面有個需求，一個頁面放了一個ScrollView，整個頁面可以向上滾動，而後ScrollView裏面又嵌套了一個ListView，ListView裏面的數據也是可以上下滑動的，理論上ListView被包在ScrollView裏面，TouchEvent確定是被ScrollView攔截了。那咱們可以採取什麼思路呢，我看網上很是多作法說是將整個ListView的高度計算出來，感受這樣很是不優雅。假設ListView數據超多。那麼頁面不是超長嗎？當中一個思路就是當咱們滑動ListView區域的時候，ScrollView不要響應OnTouch事件。觸摸ListView區域外的點才幹夠滑動整個頁面。

給出核心代碼。

        本身定義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);
                 }
            }
        });