SwipeRefreshLayout 是一个下拉刷新的控件。并且提供了一些方法:
(1)setOnRefreshListener(OnRefreshListener): 为布局添加一个Listener,就是那个下拉的监听,方法里面就是实现发生了下拉后要做什么的操作。
(2)setRefreshing(boolean): 显示或隐藏刷新进度条
(3)isRefreshing(): 检查是否处于刷新状态
(4)setColorSchemeColors(): 设置进度条的颜色。
recyclerView是一个很强大的滑动组件
老实说对于组件的介绍我真是是词穷啊。算了还是直接上主菜吧。
XML的主要代码如下:
Java代码如下:
Adapter:实现显示的内容的适配,就是RecyclerView的适配。实例中只是实现一个Textview的显示。还有的就是对上拉出现的加载动画进行控制。
public class RefreshAdapter extends RecyclerView.Adapter {
Context mContext;
LayoutInflater mInflater;
List mDatas = new ArrayList<>();
private static final int TYPE_ITEM = 0;
private static final int TYPE_FOOTER = 1;
//上拉加载更多
public static final int PULLUP_LOAD_MORE = 0;
//正在加载中
public static final int LOADING_MORE = 1;
//没有加载更多 隐藏
public static final int NO_LOAD_MORE = 2;
//上拉加载更多状态-默认为0
private int mLoadMoreStatus = 0;
public RefreshAdapter(Context mContext, List mDatas) {
this.mContext = mContext;
this.mDatas = mDatas;
mInflater = LayoutInflater.from(mContext);
}
/**
* 更新加载更多状态
*
* @param status
*/
public void changeMoreStatus(int status) {
mLoadMoreStatus = status;
notifyDataSetChanged();
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
//实现ViewHolder
Log.e("dsfadf", "onCreateViewHolder: "+"假的吧");
if (viewType == TYPE_ITEM) {
View itemView = mInflater.inflate(R.layout.item_refresh_recylerview, parent, false);
return new ItemViewHolder(itemView);
} else if (viewType == TYPE_FOOTER) {
View itemView = mInflater.inflate(R.layout.load_more, parent, false);
return new FooterViewHolder(itemView);
}
return null;
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
//绑定数据
if (holder instanceof ItemViewHolder) {
ItemViewHolder itemViewHolder = (ItemViewHolder) holder;
String str = mDatas.get(position);
itemViewHolder.tvContent.setText(str);
} else if (holder instanceof FooterViewHolder) {
FooterViewHolder footerViewHolder = (FooterViewHolder) holder;
switch (mLoadMoreStatus) {
case PULLUP_LOAD_MORE:
footerViewHolder.mTvLoadText.setText("上拉加载更多...");
footerViewHolder.mPbLoad.setVisibility(View.GONE);
break;
case LOADING_MORE:
footerViewHolder.mTvLoadText.setText("正加载更多...");
footerViewHolder.mPbLoad.setVisibility(View.VISIBLE);
break;
case NO_LOAD_MORE:
//隐藏加载更多
footerViewHolder.mLoadLayout.setVisibility(View.GONE);
break;
}
}
}
@Override
public int getItemCount() {
return mDatas.size() + 1;
}
@Override
public int getItemViewType(int position) {//position是mDatas的下标
if (position + 1 == getItemCount()) {
//最后一个item设置为footerView
return TYPE_FOOTER;
} else {
return TYPE_ITEM;
}
}
class ItemViewHolder extends RecyclerView.ViewHolder {
@BindView(R.id.tv_content)
TextView tvContent;
public ItemViewHolder(@NonNull View itemView) {
super(itemView);
ButterKnife.bind(this,itemView);
initListener(itemView);
}
private void initListener(View itemView) {
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(mContext, "poistion " + getAdapterPosition(), Toast.LENGTH_SHORT).show();
}
});
}
}
class FooterViewHolder extends RecyclerView.ViewHolder {
@BindView(R.id.pbLoad)
ProgressBar mPbLoad;
@BindView(R.id.tvLoadText)
TextView mTvLoadText;
@BindView(R.id.loadLayout)
LinearLayout mLoadLayout;
public FooterViewHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
}
在Activity中的使用如下:有些注解的代码,这些代码主要是上一篇的通用的Adapter的使用的代码:
public class SwipeRefreshActivity extends BaseActivity {
@BindView(R.id.rlv_recyclerview)
RecyclerView rlvRecyclerview;
@BindView(R.id.srl_swiperefresh)
SwipeRefreshLayout srlSwiperefresh;
List mDatas = new ArrayList<>();
private RefreshAdapter mRefreshAdapter;//一般的Adapter
// private CommonAdapter commonAdapter;//使用的是通用的单一的Adapter
// private MultipleItemTypeAdapter multipleItemTypeAdapter;//使用是多种ItemType的adapter
private LinearLayoutManager mLinearLayoutManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_swipe_refresh);
ButterKnife.bind(this);
initView();
initData();
initListener();
}
private void initData() {//初始化数据
for (int i = 0; i < 10; i++) {
mDatas.add(" Item "+i);
}
initRecylerView();
}
@SuppressLint("WrongConstant")
private void initRecylerView() {
mRefreshAdapter = new RefreshAdapter(this,mDatas);
// commonAdapter=new CommonAdapter(mDatas, this, new MultiItemTypeSupport() {
// @Override
// public int getLayoutId(int itemType) {
// if (itemType==commonAdapter.TYPE_FOOTER){
// return R.layout.load_more;
// }else if (itemType==commonAdapter.TYPE_ITEM){
// return R.layout.item_refresh_recylerview;
// }
// return 0;
// }
// @Override
// public int getItemViewType(int position, String s) {
// if (position+1==commonAdapter.getItemCount()){
// return commonAdapter.TYPE_FOOTER;
// }else{
// return commonAdapter.TYPE_ITEM;
// }
// }
// }) {
// @Override
// public void convert(ViewHolder holder, String s,int position) {
// if (position+1==commonAdapter.getItemCount()){
// switch (commonAdapter.mLoadMoreStatus){
// case PULLUP_LOAD_MORE:
// holder.setText(R.id.tvLoadText,"上拉加载更多...");
// holder.setVisibility(R.id.pbLoad,View.GONE);
// break;
// case LOADING_MORE:
// holder.setText(R.id.tvLoadText,"正加载更多...");
// holder.setVisibility(R.id.pbLoad,View.VISIBLE);
// break;
// case NO_LOAD_MORE:
// holder.setVisibility(R.id.loadLayout, View.GONE);
// break;
// }
// }else {
// holder.setText(R.id.tv_content, s);
// }
//
// }
// };
// commonAdapter=new CommonAdapter(mDatas,this,R.layout.item_refresh_recylerview) {
// @Override
// public void convert(ViewHolder holder, String s, int position) {
// holder.setText(R.id.tv_content,s);
// }
// };
//
// multipleItemTypeAdapter= new MultipleItemTypeAdapter(mDatas, this, new MultipleItemTypeSupport() {
// @Override
// public int getLayoutId(int itemViewType) {
// return itemViewType;
// }
//
// @Override
// public int getItemViewType(int position, String s) {
// if (s.startsWith("H")){
// return R.layout.item_refresh_recyclerviewright;
// }
// return R.layout.item_refresh_recylerview;
// }
// }) {
// @Override
// public void converts(ViewHolder holder, String s, int position) {
// holder.setText(R.id.tv_content,s);
// }
// };
mLinearLayoutManager = new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,
false);
rlvRecyclerview.setLayoutManager(mLinearLayoutManager);
//添加动画
rlvRecyclerview.setItemAnimator(new DefaultItemAnimator());
//添加分割线
rlvRecyclerview.addItemDecoration(new RefreshItemDecoration(this,RefreshItemDecoration.VERTICAL_LIST));
rlvRecyclerview.setLayoutManager(mLinearLayoutManager);
rlvRecyclerview.setAdapter(mRefreshAdapter);
}
private void initListener() {
initPullRefresh();
initLoadMoreListener();
}
private void initPullRefresh() {
srlSwiperefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
List headDatas = new ArrayList();
for (int i = 20; i <30 ; i++) {
headDatas.add("Heard Item "+i);
}
mDatas.addAll(0,headDatas);
mRefreshAdapter.notifyDataSetChanged();
// commonAdapter.notifyDataSetChanged();
// mRefreshAdapter.AddHeaderItem(headDatas);
//刷新完成
srlSwiperefresh.setRefreshing(false);
Toast.makeText(SwipeRefreshActivity.this, "更新了 "
+headDatas.size()+" 条目数据", Toast.LENGTH_SHORT).show();
}
},3000);
}
});
}
private void initLoadMoreListener() {
rlvRecyclerview.addOnScrollListener(new RecyclerView.OnScrollListener() {
int lastVisibleItem ;
@Override
public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
//判断RecyclerView的状态 是空闲时,同时,是最后一个可见的ITEM时才加载
if (newState == RecyclerView.SCROLL_STATE_IDLE && lastVisibleItem + 1 == mRefreshAdapter.getItemCount()) {
//设置正在加载更多
mRefreshAdapter.changeMoreStatus(mRefreshAdapter.LOADING_MORE);
// commonAdapter.mLoadMoreStatus=commonAdapter.LOADING_MORE;
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
List footerDatas = new ArrayList();
for (int i = 0; i < 10; i++) {
footerDatas.add("footer item" + i);
}
mDatas.addAll(footerDatas);
mRefreshAdapter.notifyDataSetChanged();
// mRefreshAdapter.AddFooterItem(footerDatas);
Toast.makeText(SwipeRefreshActivity.this,
"更新了 " + footerDatas.size() + " 条目数据", Toast.LENGTH_SHORT).show();
}
}, 2000);
}
}
@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
//最后一个可见的ITEM
lastVisibleItem=layoutManager.findLastVisibleItemPosition();
}
});
}
private void initView() {//设置SwipeRefershView的加载颜色
srlSwiperefresh.setColorSchemeColors(Color.RED,Color.BLUE,Color.GREEN);
}
}
这篇就这样吧,虽然写的大部分都是代码不过,要说的大部分都已经在代码中注解了,这样大家也能很好的读代码。