app/src/main/java/net/nashlegend/sourcewall/view/common/SScrollView.java

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package net.nashlegend.sourcewall.view.common;

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.ScrollView;

/**
 * Created by NashLegend on 2014/12/20 0020
 */
public class SScrollView extends ScrollView {
    public SScrollView(Context context) {
        super(context);
    }

    public SScrollView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

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

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public SScrollView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    private float lastY = 0f;
    private float currentY = 0f;
    private int lastDirection = 0;
    private int currentDirection = 0;

    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        super.onScrollChanged(l, t, oldl, oldt);
        if (getScrollY() > headerHeight) {
            float tmpCurrentY = getScrollY();
            if (Math.abs(tmpCurrentY - lastY) > touchSlop) {
                currentY = tmpCurrentY;
                currentDirection = (int) (currentY - lastY);
                if (lastDirection != currentDirection) {
                    if (currentDirection > 0) {
                        animateHide();
                    } else {
                        animateBackFooter();
                    }
                    lastDirection = currentDirection;
                }
                lastY = currentY;
            }
        } else {
            animateBack();
        }
    }