SwipeRefreshLayout的下拉刷新和上拉加载

SwipeRefreshLayout的下拉刷新和上拉加载

随着Recycleview的普遍使用,上拉刷新和上拉加载就成为开发者不可绕过的一个坎,而在所有的刷新控件中,swipeRefreshLayout独占鳌头,不过swipeRefreshLayout只给出了下拉刷新,确实没有给出上拉加载的方法,需要开发者根据自己的实际要求去自己定义,话不多说,下面就是我在开发中实现的上拉加载与下拉刷新

• 布局的使用

<android.support.v4.widget.SwipeRefreshLayout        android:id="@+id/sr_user"        android:padding="5dp"        android:layout_width="match_parent"        android:layout_height="match_parent"><android.support.v7.widget.RecyclerView        android:id="@+id/utc"        android:layout_width="match_parent"        android:layout_height="match_parent"/></android.support.v4.widget.SwipeRefreshLayout>

• 下拉刷新

mSrUser.setProgressBackgroundColorSchemeResource(android.R.color.white);        mSrUser.setColorSchemeResources(android.R.color.holo_blue_light, android.R.color.holo_red_light, android.R.color.holo_orange_light, android.R.color.holo_green_light);        mSrUser.setProgressViewOffset(false, 0, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 24, getResources().getDisplayMetrics()));        mGridLayout = new GridLayoutManager(getContext(), 2);        mGridLayout.setOrientation(OrientationHelper.VERTICAL);        mUtc.setLayoutManager(mGridLayout);        //添加分隔线        //mUtc.addItemDecoration(new AdvanceDecoration(getContext(), OrientationHelper.VERTICAL));        GridltemDecoration decoration = new GridltemDecoration(0, getContext());        mUtc.addItemDecoration(decoration);        mAdapter = new CardAdapter();        mUtc.setAdapter(mAdapter);        mSrUser.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {            @Override            public void onRefresh() {                mHandler.postDelayed(new Runnable() {                    @Override                    public void run() {                        position = 1;                        getData(1);                        mSrUser.setRefreshing(false);//刷新完毕!                        isloading = false;                        currentPage = 1;                    }                }, 500);            }        });

• 上拉加载

## mUtc自然就是Recycleview##mUtc.addOnScrollListener(new RecyclerView.OnScrollListener() { @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);      int lastVisibleItemPosition = mGridLayout.findLastVisibleItemPosition();         Log.v("lastVisibleItemPosition", lastVisibleItemPosition + "");         Log.v("mAdapter.getItemCount()", mAdapter.getItemCount() + "");            if (lastVisibleItemPosition + 1 == mAdapter.getItemCount()) {                boolean isRefreshing = mSrUser.isRefreshing();                if (isRefreshing) {                    mAdapter.notifyItemRemoved(mAdapter.getItemCount());                        return;                    }         Log.v("isloading", isloading + "");            if (isloading && dy > 0) {           //Toast.makeText(getContext(), "没有更多数据了", Toast.LENGTH_SHORT).show();                    }                    //搜索之后,关键字为空时,上拉加载            System.out.println("isloadiong====" + isloading);                if (!isloading) {                  Log.v("isloading2", isloading + "");                  Log.v("sumpageid", sumpageid.get(0) + "");                     isloading = true;                     currentPage++;                        if (currentPage > sumpageid.get(0)) {                            currentPage = sumpageid.get(0);                            return;                        }                        mHandler.postDelayed(new Runnable() {                            @Override                            public void run() {                                getData(currentPage);                                Log.v("currentpag++", currentPage + "");                                isloading = false;                                position=2;                            }                        }, 1000);                    }                }            }        });

• 重点,加载数据时的用法`

@Overridepublic void onResponse(String response, int id) {  mTopicSearchWeiboEntity = JSON.parseObject(response, TopicSearchWeiboEntity.class);    记录总页数  sumpageid.clear();  sumpageid.add(mTopicSearchWeiboEntity.getData().getPageTotal());    if (mTopicSearchWeiboEntity.getState() == 0) {    stateLayout.showContent();    mRlNetStates.setVisibility(View.GONE);         list.clear();         newlist.clear();         list.addAll(mTopicSearchWeiboEntity.getData().getItems());         newlist.addAll(list);           if (position == 1) {              mAdapter.addItem(newlist);           } else {              mAdapter.addMoreItem(newlist);           }        } else if (mTopicSearchWeiboEntity.getState() == 3) {              stateLayout.showEmpty();        } else {              stateLayout.showError();   } }

当获取数据后加载数据,主要的两行代码list.clear();newlist.clear();list.addAll(mTopicSearchWeiboEntity.getData().getItems());newlist.addAll(list);  if (position == 1) {     mAdapter.addItem(newlist);  } else {     mAdapter.addMoreItem(newlist);}

• addItem方法和addMoreItem方法在Adapter中的实现

//添加数据public void addItem(List<TopicSearchWeiboEntity.DataBean.ItemsBean> newDatas) {    list.clear();    newDatas.addAll(list);    list.removeAll(list);    list.addAll(newDatas);    notifyDataSetChanged();  }public void addMoreItem(List<TopicSearchWeiboEntity.DataBean.ItemsBean> newDatas) {    list.addAll(newDatas);    notifyDataSetChanged();    }