BaseRecyclerViewAdapterHelper
BaseRecyclerViewAdapterHelper 是一个针对Recycler控件的第三方，可以轻松实现多个效果，为我们节省了大量的重复代码，点击跳转github地址
项目中引用导入
java
implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:3.0.4'
// root build.gradle文件中导入
allprojects {
repositories {
google()
jcenter()
maven { url "https://jitpack.io" }
}
}1
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简单使用 BaseQuickAdapter
- Adapter 继承自
BaseQuickAdapter
java
public class DemoAdapter extends BaseQuickAdapter<ItemModel, BaseViewHolder> {
public DemoAdapter() {
super(R.layout.item_row_view);
}
// 行内的item
@Override
protected void convert(@NotNull BaseViewHolder baseViewHolder, ItemModel itemModel) {
((TextView)baseViewHolder.findView(R.id.text)).setText(itemModel.title);
}
}1
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- 使用
java
public class MainActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private DemoAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = findViewById(R.id.recycler_view);
GridLayoutManager manager = new GridLayoutManager(this,2);
mRecyclerView.setLayoutManager(manager);
mAdapter = new DemoAdapter();
mRecyclerView.setAdapter(mAdapter);
initData();
}
private void initData() {
List<ItemModel> datas = new ArrayList<>();
for (int i = 0; i < 20; i++) {
ItemModel itemModel = new ItemModel();
itemModel.title = String.valueOf(i);
datas.add(itemModel);
}
// 设置数据
mAdapter.setList(datas);
//mAdapter.addData(datas);用来实现添加数据，一般在获取到加载更多数据的使用
}
}1
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- RecyclerView顶部添加header视图
java
View headerView = getLayoutInflater().inflate(R.layout.top_view,mRecyclerView,false);
mAdapter.addHeaderView(headerView);1
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- 添加点击方法
java
mAdapter.addChildClickViewIds(R.id.text);
mAdapter.setOnItemChildClickListener(new OnItemChildClickListener() {
@Override
public void onItemChildClick(@NonNull BaseQuickAdapter adapter, @NonNull View view, int position) {
}
});1
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- 使用
LoadMoreModule接口实现加载更多数据，adapter实现public class LoadMoreAdapter extends BaseQuickAdapter<Status, BaseViewHolder> implements LoadMoreModule
java
/**
* 初始化加载更多
*/
private void initLoadMore() {
mAdapter.getLoadMoreModule().setOnLoadMoreListener(new OnLoadMoreListener() {
@Override
public void onLoadMore() {
request();
}
});
mAdapter.getLoadMoreModule().setAutoLoadMore(true);
//当自动加载开启，同时数据不满一屏时，是否继续执行自动加载更多(默认为true)
mAdapter.getLoadMoreModule().setEnableLoadMoreIfNotFullPage(false);
}
/**
* 请求数据
*/
private void request() {
new Request(pageInfo.page, new RequestCallBack() {
@Override
public void success(List<Status> data) {
mSwipeRefreshLayout.setRefreshing(false);
mAdapter.getLoadMoreModule().setEnableLoadMore(true);
if (pageInfo.isFirstPage()) {
//如果是加载的第一页数据，用 setData()
mAdapter.setList(data);
} else {
//不是第一页，则用add
mAdapter.addData(data);
}
if (data.size() < PAGE_SIZE) {
//如果不够一页,显示没有更多数据布局
mAdapter.getLoadMoreModule().loadMoreEnd();
Tips.show("no more data");
} else {
mAdapter.getLoadMoreModule().loadMoreComplete();
}
// page加一
pageInfo.nextPage();
}
@Override
public void fail(Exception e) {
Tips.show(getResources().getString(R.string.network_err));
mSwipeRefreshLayout.setRefreshing(false);
mAdapter.getLoadMoreModule().setEnableLoadMore(true);
mAdapter.getLoadMoreModule().loadMoreFail();
}
}).start();
}1
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加载不同的界面(简单的分区，不适用于复杂界面)
RecyclerView加载不同视图的原理
RecyclerView如果想要加载不同的view，必须要知道在什么时候，加载什么样的视图，如果继承RecyclerView.Adapter,需要重写 getItemViewType 和 onCreateViewHolder 两个方法，在getItemViewType方法中返回类型，在onCreateViewHolder 方法中根据类型创建不同的视图
举个栗子：
java
// 定义三个常量标识，三种item类型
public static final int TYPE_FULL_IMAGE = 0;
public static final int TYPE_RIGHT_IMAGE = 1;
public static final int TYPE_THREE_IMAGES = 2;
// 返回定义的类型
public int getItemViewType(int position){
ItemModel model = mData.get(position);
if (model.getType() == 0){
return TYPE_FULL_IMAGE;
}else if (model.getType() == 1){
return TYPE_RIGHT_IMAGE;
}else {
return TYPE_THREE_IMAGES;
}
}
// 根据类型返回对应的view
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view;
if (viewType == TYPE_FULL_IMAGE){
view = View.inflate(parent.getContext(),R.layout.item_type_full_image,null);
}else if (viewType == TYPE_RIGHT_IMAGE){
view = View.inflate(parent.getContext(),R.layout.item_type_left_title,null);
}else {
view = View.inflate(parent.getContext(),R.layout.item_type_right_title,null);
}
return new ViewHolder(view);
}1
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BaseSectionQuickAdapter加载不同视图的具体实现
- 首先在模型上，需要实现
SectionEntity接口,需要实现isHeader()和getItemType()方法来区分类型。
java
// SectionEntity.HEADER_TYPE head头
// SectionEntity.NORMAL_TYPE 默认视图
import com.chad.library.adapter.base.entity.SectionEntity;
public class ItemModel implements SectionEntity {
String title;
boolean isHeader;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public void setHeader(boolean header) {
isHeader = header;
}
@Override
public boolean isHeader() {
return isHeader;
}
@Override
public int getItemType() {
return isHeader ? SectionEntity.HEADER_TYPE : SectionEntity.NORMAL_TYPE;
}
}1
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- Adapter继承
BaseSectionQuickAdapter时，可以在初始化方法中直接加载对应的xml视图
java
import com.chad.library.adapter.base.BaseSectionQuickAdapter;
import com.chad.library.adapter.base.viewholder.BaseViewHolder;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.List;
public class DemoAdapter extends BaseSectionQuickAdapter<ItemModel, BaseViewHolder> {
public DemoAdapter(@Nullable List<ItemModel> data) {
super(R.layout.item_section_title_view, R.layout.item_row_view, data);
}
// 头部的item
@Override
protected void convertHeader(@NotNull BaseViewHolder baseViewHolder, @NotNull ItemModel itemModel) {
((TextView)baseViewHolder.findView(R.id.header)).setText(itemModel.title);
}
// 行内的item
@Override
protected void convert(@NotNull BaseViewHolder baseViewHolder, ItemModel itemModel) {
((TextView)baseViewHolder.findView(R.id.text)).setText(itemModel.title);
}
}1
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- Activity中的使用
java
public class MainActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private DemoAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = findViewById(R.id.recycler_view);
GridLayoutManager manager = new GridLayoutManager(this,2);
mRecyclerView.setLayoutManager(manager);
mAdapter = new DemoAdapter(new ArrayList<ItemModel>());
mRecyclerView.setAdapter(mAdapter);
initData();
initTopView();
}
// 加载头部视图
private void initTopView() {
View headerView = getLayoutInflater().inflate(R.layout.top_view,mRecyclerView,false);
mAdapter.addHeaderView(headerView);
}
private void initData() {
List<ItemModel> datas = new ArrayList<>();
for (int i = 0; i < 20; i++) {
ItemModel itemModel = new ItemModel();
itemModel.title = String.valueOf(i);
if (i % 5 == 0){
itemModel.isHeader = true;
}
datas.add(itemModel);
}
mAdapter.setList(datas);
}
}1
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