如果appBarLayout中有摺疊控制元件 CollapsingToolbarLayout 或者其他一些控制元件 在滾動的時候進行判斷和重新整理事件處理

在這裡:重新整理框架:為

SwipyRefreshLayout

第一步:設定appBarLayout的監聽:

if (appBarLayout != null)
            appBarLayout.addOnOffsetChangedListener(this);

    @Override
    public void onOffsetChanged(AppBarLayout appBarLayout, int i) {
        super.onOffsetChanged(appBarLayout, i);
        if (srlLayout == null) return;
        srlLayout.setEnabled(i >= 0||isSlideToBottom(recyclerview) ? true : false);
    }
 

至於 isSlideToBottom方法請檢視 reyclerView滾動到底部的監聽

當recyclerView滾動到底部 也需要開啟 重新整理控制元件的觸控事件 enable=true;

遮蔽重新整理控制元件的範圍:當appBarLayout 在滾動中 recylerView 沒有滾動到底部

這裡還有一種實現方式:

    @Override
    public void onOffsetChanged(AppBarLayout appBarLayout, int i) {
        super.onOffsetChanged(appBarLayout, i);
        LogUtils.d("-------->off:" + i + "  ScrollRange:" + appBarLayout.getTotalScrollRange() + "  height:" + appBarLayout.getHeight());
    }
 

可以觀察到i>=0 表示appBarLaoyut完全開啟

i==-appBarLayout.getTotalScrollRange() 時表示appBarLayout完全關閉或者摺疊了

所以:i==-appBarLayout.getTotalScrollRange() 也可以進行判斷 然後分發給重新整理控制元件

順便給出一個工具類:

<pre name="code" class="java">
import android.support.design.widget.AppBarLayout;
import android.support.v7.widget.RecyclerView;

/**
 * @author xuanyouwu
 * @email 
 
[email protected]
 * @time 2016-04-13 16:25
 */
public class DesignViewUtils {

    /**
     * AppBarLayout 完全顯示 開啟狀態
     *
     * @param verticalOffset
     * @return
     */
    public static boolean isAppBarLayoutOpen(int verticalOffset) {
        return verticalOffset >= 0;
    }

    /**
     * AppBarLayout 關閉或摺疊狀態
     *
     * @param appBarLayout
     * @param verticalOffset
     * @return
     */
    public static boolean isAppBarLayoutClose(AppBarLayout appBarLayout, int verticalOffset) {
        return appBarLayout.getTotalScrollRange() == Math.abs(verticalOffset);
    }

    /**
     * RecyclerView 滾動到底部 最後一條完全顯示
     *
     * @param recyclerView
     * @return
     */
    public static boolean isSlideToBottom(RecyclerView recyclerView) {
        if (recyclerView == null) return false;
        if (recyclerView.computeVerticalScrollExtent() + recyclerView.computeVerticalScrollOffset() >= recyclerView.computeVerticalScrollRange())
            return true;
        return false;
    }

    /**
     * RecyclerView 滾動到頂端
     *
     * @param recyclerView
     * @return
     */
    public static boolean isSlideToTop(RecyclerView recyclerView) {
        return recyclerView.computeVerticalScrollOffset() <= 0;
    }
}

完美解決重新整理案例:

<pre name="code" class="java">
import android.support.design.widget.AppBarLayout;
import android.support.v4.view.ViewCompat;
import android.support.v7.widget.RecyclerView;
import android.view.ViewGroup;

import com.kekeclient.widget.design.DesignViewUtils;

/**
 * @author xuanyouwu
 * @email [email protected]
 * @time 2016-04-15 11:20
 * <p/>
 * 解決 巢狀nestScrolling appbar 重新整理衝突
 */
public class SwipyAppBarScrollListener extends RecyclerView.OnScrollListener implements AppBarLayout.OnOffsetChangedListener {
    private AppBarLayout appBarLayout;
    private RecyclerView recyclerView;
    private ViewGroup refreshLayout;
    private boolean isAppBarLayoutOpen = true;
    private boolean isAppBarLayoutClose;

    public SwipyAppBarScrollListener(AppBarLayout appBarLayout, ViewGroup refreshLayout, RecyclerView recyclerView) {
        this.appBarLayout = appBarLayout;
        this.refreshLayout = refreshLayout;
        this.recyclerView = recyclerView;
        disptachScrollRefresh();
    }


    private void disptachScrollRefresh() {
        if (this.appBarLayout != null && this.recyclerView != null && refreshLayout != null) {
            this.appBarLayout.addOnOffsetChangedListener(this);
            this.recyclerView.addOnScrollListener(this);
        }
    }

    @Override
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        super.onScrollStateChanged(recyclerView, newState);
    }

    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);
        dispatchScroll();
    }

    @Override
    public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
        isAppBarLayoutOpen = DesignViewUtils.isAppBarLayoutOpen(verticalOffset);
        isAppBarLayoutClose = DesignViewUtils.isAppBarLayoutClose(appBarLayout, verticalOffset);
        dispatchScroll();
    }

    private void dispatchScroll() {
        if (this.recyclerView != null && this.appBarLayout != null && this.refreshLayout != null) {
            //不可滾動
            if (!(ViewCompat.canScrollVertically(recyclerView, -1) || ViewCompat.canScrollVertically(recyclerView, 1))) {
                refreshLayout.setEnabled(isAppBarLayoutOpen);
            } else//可以滾動
            {
                if (isAppBarLayoutOpen || isAppBarLayoutClose) {
                    if (!ViewCompat.canScrollVertically(recyclerView, -1) && isAppBarLayoutOpen) {
                        refreshLayout.setEnabled(true);
                    } else if (isAppBarLayoutClose && !ViewCompat.canScrollVertically(recyclerView, 1)) {
                        refreshLayout.setEnabled(true);
                    } else {
                        refreshLayout.setEnabled(false);
                    }
                } else {
                    refreshLayout.setEnabled(false);
                }
            }
        }
    }
}

recyclerview.addOnScrollListener(new SwipyAppBarScrollListener(appBarLayout, srlLayout, recyclerview));