效果图
dd.gif
说明
1.本demo使用的数据,均由gank.io提供
2.下拉刷新使用的是SwipeRefreshLayout
3.上拉加载更多使用的是BRVAH提供的BaseRecyclerViewAdapterHelper:2.1.3
抽取接口
public interface IPagingService {
/**
* 加载分页数据
* @param page 加载第几页
* @param limit 1页加载多少条
*/
void getData(int page,int limit, Observer observer);
}
编写基类(实现分页逻辑)
public class BasePagingActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener, BaseQuickAdapter.RequestLoadMoreListener {
private static final int PAGE_SIZE = 20;
private RecyclerView mRecyclerView;
private BaseQuickAdapter mQuickAdapter;
private IPagingService> mPagingService;
private SwipeRefreshLayout mSwipeRefreshLayout;
private int currentPage;
private int lastPage;
private void setSwipeRefreshLayout(SwipeRefreshLayout swipeRefreshLayout) {
if (swipeRefreshLayout != null) {
mSwipeRefreshLayout = swipeRefreshLayout;
mSwipeRefreshLayout.setProgressBackgroundColorSchemeResource(android.R.color.white);
mSwipeRefreshLayout.setProgressViewOffset(false, 0, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 24, getResources().getDisplayMetrics()));
mSwipeRefreshLayout.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);
swipeRefreshLayout.setOnRefreshListener(this);
} else {
throw new NullPointerException("swipeRefreshLayout not null");
}
}
private void setRecyclerView(RecyclerView recyclerView) {
mRecyclerView = recyclerView;
if (mRecyclerView.getLayoutManager() == null) {
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
}
}
private void setQuickAdapter(BaseQuickAdapter quickAdapter) {
if (quickAdapter != null) {
mQuickAdapter = quickAdapter;
mQuickAdapter.openLoadAnimation();
mQuickAdapter.openLoadMore(PAGE_SIZE);
mQuickAdapter.setOnLoadMoreListener(this);
mRecyclerView.setAdapter(quickAdapter);
} else {
throw new NullPointerException("swipeRefreshLayout not null");
}
}
/**
* 开始获取数据,提供给子类调用
*/
protected void startGetData(RecyclerView recyclerView,SwipeRefreshLayout swipeRefreshLayout,BaseQuickAdapter quickAdapter, IPagingService> pagingService){
mPagingService = pagingService;
setRecyclerView(recyclerView);
setSwipeRefreshLayout(swipeRefreshLayout);
setQuickAdapter(quickAdapter);
onLoadFirstData();
}
@Override
public void onRefresh() {
currentPage = 1;
mPagingService.getData(currentPage, PAGE_SIZE, new Observer>() {
@Override
public void onCompleted() {
}
@Override
public void onError(Throwable e) {
Toast.makeText(BasePagingActivity.this,e.getMessage(),Toast.LENGTH_SHORT).show();
mSwipeRefreshLayout.setRefreshing(false);
currentPage = lastPage;
}
@Override
public void onNext(List list) {
if (list == null) return;
if (!mQuickAdapter.isLoading()){
mQuickAdapter.openLoadMore(PAGE_SIZE);
}
mQuickAdapter.getData().clear();
mQuickAdapter.addData(list);
mQuickAdapter.notifyDataSetChanged();
mSwipeRefreshLayout.setRefreshing(false);
}
});
}
@Override
public void onLoadMoreRequested() {
lastPage = currentPage;
currentPage++;
mPagingService.getData(currentPage, PAGE_SIZE, new Observer>() {
@Override
public void onCompleted() {
}
@Override
public void onError(Throwable e) {
Toast.makeText(BasePagingActivity.this,e.getMessage(),Toast.LENGTH_SHORT).show();
currentPage = lastPage;
}
@Override
public void onNext(List list) {
if ((list != null && list.isEmpty())) {
Toast.makeText(BasePagingActivity.this,"没有更多数据了",Toast.LENGTH_SHORT).show();
mQuickAdapter.addData(list);
mQuickAdapter.loadComplete();
} else {
mQuickAdapter.addData(list);
}
lastPage = currentPage;
}
});
}
public void onLoadFirstData(){
lastPage = currentPage = 1;
mSwipeRefreshLayout.setRefreshing(true);
mPagingService.getData(currentPage, PAGE_SIZE, new Observer>() {
@Override
public void onCompleted() {
}
@Override
public void onError(Throwable e) {
Toast.makeText(BasePagingActivity.this,e.getMessage(),Toast.LENGTH_SHORT).show();
mSwipeRefreshLayout.setRefreshing(false);
}
@Override
public void onNext(List list) {
if (list == null) return;
mQuickAdapter.addData(list);
mQuickAdapter.notifyDataSetChanged();
mSwipeRefreshLayout.setRefreshing(false);
}
});
}
}
fragment同样可以这样做
使用
1.实现IPagingService
public class WelfareServer implements IPagingService>{
@Override
public void getData(int page, int limit, Observer> observer) {
RetrofitManager.getInstance().createReq(GankIo.class)
.getWelfareImg(limit, page)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(observer);
}
}
2.继承BasePagingActivity并调用startGetData方法
public class MainActivity extends BasePagingActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SwipeRefreshLayout mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.refresh_layout);
RecyclerView mRecyclerView = (RecyclerView) findViewById(R.id.list);
startGetData(mRecyclerView, mSwipeRefreshLayout, new BaseQuickAdapter(R.layout.item_welfare,new ArrayList()){
@Override
protected void convert(BaseViewHolder baseViewHolder, WelfareEntity welfareEntity) {
Glide.with(MainActivity.this)
.load(welfareEntity.getUrl())
.placeholder(R.mipmap.load_image_bg)
.into((ImageView) baseViewHolder.getView(R.id.iv));
}
},new WelfareServer());
}
}
最后附上demo地址
github : https://github.com/aii1991/LoadDataDemo