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Android RecyclerView下拉刷新和上拉加载及依赖

2018年09月19日  | 移动技术网IT编程  | 我要评论

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效果图:

\

代码已经同步到github~

gradle引入依赖:

  allprojects {
    		repositories {
    			...
    			maven { url 'https://jitpack.io' }
    		}
    	}


    dependencies {
    	        compile 'com.github.louyulin:pullloadrecyclerview:v1.1'
    	}

关键代码使用:

  //绑定组件
    pullrv = (pullloadrecyclerview) findviewbyid(r.id.pullrv);
    //设置下拉颜色
    pullrv.setswiperefreshcolor(android.r.color.holo_blue_bright,android.r.color.holo_blue_dark,android.r.color.holo_blue_bright);
    //设置列数和滚动方向
    pullrv.setlayoutmanager(4, linearlayoutmanager.vertical);
     //设置监听
            pullrv.setonpullloadmorelistener(new pullloadrecyclerview.onpullloadmorelistener() {
                @override
                public void rerresh() {

                }

                @override
                public void loadmore() {

                }
            });

分析:

继承linearlayout并将recyclerview和底布局包含在内

public class pullloadrecyclerview extends linearlayout {

    private context mcontext;
    private swiperefreshlayout mswiperefreshlayout;
    private boolean misrefresh = false; //是否是刷新
    private boolean misloadmore = false; //是否是加载更多
    private recyclerview mrecyclerview;
    private view mfootview;
    private onpullloadmorelistener monpullloadmorelistener;

    public pullloadrecyclerview(context context, attributeset attrs, int defstyleattr) {
        super(context, attrs, defstyleattr);
        initview(context);
    }

    public pullloadrecyclerview(context context, attributeset attrs) {
        super(context, attrs);
        initview(context);
    }

    public pullloadrecyclerview(context context) {
        super(context);
        initview(context);
    }

    private void initview(context context) {
        mcontext = context;
        view view = layoutinflater.from(mcontext).inflate(r.layout.pull_loadmore_layout, null);
        mswiperefreshlayout = (swiperefreshlayout) view.findviewbyid(r.id.swiperefreshlayout);

        mswiperefreshlayout.setonrefreshlistener(new swiperefreshlayoutonrefresh());

        //处理recyclerview
        mrecyclerview = (recyclerview) view.findviewbyid(r.id.recyclerview);
        mrecyclerview.sethasfixedsize(true); //设置固定大小
        mrecyclerview.setitemanimator(new defaultitemanimator());//使用默认动画
        mrecyclerview.setontouchlistener(new ontouchlistener() {
            @override
            public boolean ontouch(view v, motionevent event) {
                return misrefresh || misloadmore;
            }
        });

        mrecyclerview.setverticalscrollbarenabled(false);//隐藏滚动条
        mrecyclerview.addonscrolllistener(new recyclerviewonscroll());
        mfootview = view.findviewbyid(r.id.footer_view);
        imageview imageview = (imageview) mfootview.findviewbyid(r.id.iv_load_img);
   
        textview textview = (textview) mfootview.findviewbyid(r.id.tv_load_text);
        mfootview.setvisibility(view.gone);
        //view 包含swiperefreshlayout, recyclerview, footview
        this.addview(view);//
    }

    //设置刷新时控件颜色渐变
    public void setswiperefreshcolor(integer ...colors) {
        for (int i = 0; i < colors.length ; i++) {
            mswiperefreshlayout.setcolorschemeresources(colors[i]);
        }
    }

    //外部可以设置recyclerview的列数

    public void setlayoutmanager(int spancount,int orientation){
        gridlayoutmanager manager = new gridlayoutmanager(mcontext, spancount);
        manager.setorientation(orientation);
        mrecyclerview.setlayoutmanager(manager);
    }

    public void setadapter(recyclerview.adapter adapter) {
        if (adapter != null) {
            mrecyclerview.setadapter(adapter);
        }
    }

    class swiperefreshlayoutonrefresh implements swiperefreshlayout.onrefreshlistener{

        @override
        public void onrefresh() {
             if (!misrefresh) {
                 misrefresh = true;
                 refreshdata();
             }
        }
    }

    class recyclerviewonscroll extends recyclerview.onscrolllistener {
        @override
        public void onscrolled(recyclerview recyclerview, int dx, int dy) {
            super.onscrolled(recyclerview, dx, dy);
            int firstitem = 0;
            int lastitem = 0;
            recyclerview.layoutmanager manager = recyclerview.getlayoutmanager();
            int totalcount = manager.getitemcount();
            if (manager instanceof gridlayoutmanager) {
                gridlayoutmanager gridlayoutmanager = (gridlayoutmanager) manager;
                //第一个完全可见的item
                firstitem = gridlayoutmanager.findfirstcompletelyvisibleitemposition();
                //最后一个完全可见的item
                lastitem = gridlayoutmanager.findlastcompletelyvisibleitemposition();
                if (firstitem == 0 || firstitem == recyclerview.no_position) {
                    lastitem = gridlayoutmanager.findlastvisibleitemposition();
                }
            }
            //什么时候触发上拉加载更多?
            // 1.加载更多是false
            // 2.totalcount - 1 === lastitem
            // 3.mswiperefreshlayout可以用
            // 4. 不是处于下拉刷新状态
            // 5. 偏移量dx > 0 或dy > 0
            if (!misloadmore
                && totalcount - 1 == lastitem
                && mswiperefreshlayout.isenabled()
                && !misrefresh
                && (dx > 0 || dy > 0)) {
                misloadmore = true;
                //在加载更多时,禁止mswiperefreshlayout使用
                mswiperefreshlayout.setenabled(false);
                loadmoredata();
            } else {
                mswiperefreshlayout.setenabled(true);
            }
        }
    }

    private void refreshdata() {
        if (monpullloadmorelistener != null) {
            monpullloadmorelistener.rerresh();
        }
    }

    private void loadmoredata() {
        if (monpullloadmorelistener != null) {
            mfootview.animate().translationy(0).setinterpolator(new acceleratedecelerateinterpolator())
                    .setduration(300).setlistener(new animatorlisteneradapter() {
                @override
                public void onanimationstart(animator animation) {
                    super.onanimationstart(animation);
                    mfootview.setvisibility(view.visible);
                    //manimationdrawable.start();
                }
            }).start();
            invalidate();
            monpullloadmorelistener.loadmore();
        }
    }

    //设置刷新完毕
    public void setrefreshcompleted() {
        misrefresh = false;
        setrefreshing(false);
    }

    //设置是否正在刷新
    private void setrefreshing(final boolean isrefreshing) {
        mswiperefreshlayout.post(new runnable() {
            @override
            public void run() {
                mswiperefreshlayout.setrefreshing(isrefreshing);
            }
        });
    }

    public void setloadmorecompleted() {
        misloadmore = false;
        misrefresh = false;
        setrefreshing(false);
        mfootview.animate().translationy(mfootview.getheight()).setinterpolator(new acceleratedecelerateinterpolator())
                .setduration(300).start();
    }

    public interface onpullloadmorelistener {
        void rerresh();
        void loadmore();
    }

    public void setonpullloadmorelistener(onpullloadmorelistener listener) {
        monpullloadmorelistener = listener;
    }
}

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