android官方的SwipeRefreshlayout控件不支持上拉加載，于是修改了MultiStateView的部分代碼，做為listView的footview，封裝成了這個(gè)可以加載更多的控件，且footview的狀態(tài)可以改變。

地址：https://github.com/fantianwen/MultiStateRefreshLayout

• 支持ListView
• 支持footView改變狀態(tài)

使用方法

<van.tian.wen.multirefreshlayout.MultiStateRefreshLayout
        android:id="@+id/multiRefreshLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        van:emptyView="@layout/emptylayout"
        van:errorView="@layout/errorlayout"
        van:listView="@layout/lv"
        van:loadingView="@layout/loadinglayout"
        van:successView="@layout/successlayout"
        van:unknownView="@layout/unknownlayout">

    </van.tian.wen.multirefreshlayout.MultiStateRefreshLayout>

代碼中：

 multiRefreshLayout = (MultiStateRefreshLayout) findViewById(R.id.multiRefreshLayout);
        multiRefreshLayout.setColorSchemeColors(Color.GREEN);

        mListView = multiRefreshLayout.getListView();
        multiRefreshLayout.setListView(mListView);

        myAdapter = new MyAdapter(this, mLists);
        mListView.setAdapter(myAdapter);

        multiRefreshLayout.setOnLoadingListener(new MultiStateRefreshLayout.OnLoadingListener() {
            @Override
            public void onLoadMore() {
                // 加載更多
            }
        });
        multiRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
               // 刷新
            }
        });
        multiRefreshLayout.setOnSucessFootClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 點(diǎn)擊footView的加載加載更多
            }
        });

實(shí)現(xiàn)原理

關(guān)鍵代碼：

public void setListView(final ListView mListView) {
        this.mListView = mListView;

        mListView.setOnScrollListener(new AbsListView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
                switch (scrollState) {
                    case SCROLL_STATE_FLING:
                        break;
                    case SCROLL_STATE_IDLE:
                        //監(jiān)聽(tīng)是都能夠上拉刷新
                        if (canRefresh()) {
                            setEnabled(true);
                        } else {
                            setEnabled(false);
                        }
                        //監(jiān)聽(tīng)能夠上拉加載更多
                        if (canLoadMore(scrollState)) {
                            loadData();
                        }
                        break;
                }
            }

            @Override
            public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

            }
        });

    }

其實(shí)主要解決的問(wèn)題就是SwipeRefreshLayout的下拉操作會(huì)和ListView的下拉操作相沖突，我們只要在ListView的scrollListener中進(jìn)行判斷：

 case SCROLL_STATE_IDLE:
                        //監(jiān)聽(tīng)是都能夠上拉刷新
                        if (canRefresh()) {
                            setEnabled(true);
                        } else {
                            setEnabled(false);
                        }
                        //監(jiān)聽(tīng)能夠上拉加載更多
                        if (canLoadMore(scrollState)) {
                            loadData();
                        }
                        break;

其中canRefresh()代碼如下：

private boolean canRefresh() {
        return isTop();
    }

    private boolean isTop() {
        if (mListView.getCount() > 0) {
            if (mListView.getFirstVisiblePosition() == 0
                    && mListView.getChildAt(0).getTop() >= mListView.getTop()) {
                return true;
            }
        }
        return false;
    }

不足

改變狀態(tài)需要自主代碼調(diào)用實(shí)現(xiàn)，因?yàn)?code>SwipeRefreshLayout不能夠判斷已經(jīng)刷新完畢，這點(diǎn)比較不人性化。