BookNestedScrollView.java

package com.codingbingo.fastreader.view;

import android.content.Context;
import android.support.v4.widget.NestedScrollView;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.ViewConfiguration;

/**
 * Created by bingo on 2016/12/21.
 */

public class BookNestedScrollView extends NestedScrollView {

    private int downY;
    private int mTouchSlop;

    public BookNestedScrollView(Context context) {
        super(context);

        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
    }

    public BookNestedScrollView(Context context, AttributeSet attrs) {
        super(context, attrs);

        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
    }

    public BookNestedScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        switch (ev.getAction()){
            case MotionEvent.ACTION_DOWN:
                downY = (int) ev.getY();
                break;
            case MotionEvent.ACTION_MOVE:
                int moveY = (int) ev.getRawY();
                if (Math.abs(moveY - downY) > mTouchSlop) {
                    return true;
                }
                break;
        }
        return super.onInterceptTouchEvent(ev);
    }
}