官网： https://github.com/CymChad/BaseRecyclerViewAdapterHelper 在这里简单说明记录一下，它有两个版本2.x和3.x版
我这里用的是最新的3.x,环境也是在，用的是androidx：
compileSdkVersion 29 buildToolsVersion "29.0.2"上图：
1.添加依赖
implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:3.0.4'2.新建activity布局
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".recy.BashRecyActivity"> <androidx.recyclerview.widget.RecyclerView android:id="@+id/rv_list" android:layout_width="match_parent" android:layout_height="wrap_content"/> </RelativeLayout>3.新建适配器类 （两个类）
public class NodeTreeAdapter extends BaseNodeAdapter { public NodeTreeAdapter() { super(); addNodeProvider(new FirstProvider()); addNodeProvider(new SecondProvider()); } @Override protected int getItemType(@NotNull List<? extends BaseNode> list, int i) { BaseNode node = list.get(i); if (node instanceof FirstNode) { return 1; } else if (node instanceof SecondNode) { return 2; } return -1; } public static final int EXPAND_COLLAPSE_PAYLOAD = 110; }
1.FirstProvider
public class FirstProvider extends BaseNodeProvider { @Override public int getItemViewType() { return 1; } @Override public int getLayoutId() { return R.layout.item_node_first; } @Override public void convert(@NotNull BaseViewHolder baseViewHolder, BaseNode baseNode) { FirstNode entity = (FirstNode) baseNode; baseViewHolder.setText(R.id.title, entity.getTitle()); baseViewHolder.setImageResource(R.id.iv, R.mipmap.ic_launcher); setArrowSpin(baseViewHolder, baseNode, false); } @Override public void convert(@NotNull BaseViewHolder helper, @NotNull BaseNode data, @NotNull List<?> payloads) { for (Object payload : payloads) { if (payload instanceof Integer && (int) payload == NodeTreeAdapter.EXPAND_COLLAPSE_PAYLOAD) { // 增量刷新，使用动画变化箭头 setArrowSpin(helper, data, true); } } } private void setArrowSpin(BaseViewHolder helper, BaseNode data, boolean isAnimate) { FirstNode entity = (FirstNode) data; ImageView imageView = helper.getView(R.id.iv); if (entity.isExpanded()) { if (isAnimate) { ViewCompat.animate(imageView).setDuration(200) .setInterpolator(new DecelerateInterpolator()) .rotation(0f) .start(); } else { imageView.setRotation(0f); } } else { if (isAnimate) { ViewCompat.animate(imageView).setDuration(200) .setInterpolator(new DecelerateInterpolator()) .rotation(90f) .start(); } else { imageView.setRotation(90f); } } } @Override public void onClick(@NotNull BaseViewHolder helper, @NotNull View view, BaseNode data, int position) { // 这里使用payload进行增量刷新（避免整个item刷新导致的闪烁，不自然） getAdapter().expandOrCollapse(position, true, true, NodeTreeAdapter.EXPAND_COLLAPSE_PAYLOAD); } }FirstNode
public class FirstNode extends BaseExpandNode { private List<BaseNode> childNode; private String title; public FirstNode(List<BaseNode> childNode, String title) { this.childNode = childNode; this.title = title; setExpanded(false); } public String getTitle() { return title; } @Nullable @Override public List<BaseNode> getChildNode() { return childNode; } }2.SecondProvider
public class SecondProvider extends BaseNodeProvider { @Override public int getItemViewType() { return 2; } @Override public int getLayoutId() { return R.layout.item_node_second; } @Override public void convert(@NotNull BaseViewHolder helper, @NotNull BaseNode data) { SecondNode entity = (SecondNode) data; helper.setText(R.id.title, entity.getTitle()); if (entity.isExpanded()) { helper.setImageResource(R.id.iv, R.mipmap.ic_launcher); } else { helper.setImageResource(R.id.iv, R.mipmap.ic_launcher); } } @Override public void onClick(@NotNull BaseViewHolder helper, @NotNull View view, BaseNode data, int position) { SecondNode entity = (SecondNode) data; if (entity.isExpanded()) { getAdapter().collapse(position); } else { getAdapter().expandAndCollapseOther(position); } }SecondNode public class SecondNode extends BaseExpandNode { private List<BaseNode> childNode; private String title; public SecondNode(List<BaseNode> childNode, String title) { this.childNode = childNode; this.title = title; setExpanded(false); } public String getTitle() { return title; } @Nullable @Override public List<BaseNode> getChildNode() { return childNode; } }
4.主activity
public class BashRecyActivity extends AppCompatActivity { private RecyclerView mRecyclerView; private NodeTreeAdapter adapter = new NodeTreeAdapter(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_bash_recy); setTitle("Node Use (Tree)"); mRecyclerView = findViewById(R.id.rv_list); mRecyclerView.setLayoutManager(new LinearLayoutManager(this)); mRecyclerView.setAdapter(adapter); adapter.setList(getEntity()); Log.i("显示", "onCreate: "+getEntity()); // 模拟新增node mRecyclerView.postDelayed(new Runnable() { @Override public void run() { SecondNode seNode = new SecondNode(new ArrayList<BaseNode>(), "Second Node(This is added)"); SecondNode seNode2 = new SecondNode(new ArrayList<BaseNode>(), "Second Node(This is added)"); List<SecondNode> nodes = new ArrayList<>(); nodes.add(seNode); nodes.add(seNode2); //第一个夫node，位置为子node的3号位置 adapter.nodeAddData(adapter.getData().get(0), 2, nodes); // adapter.nodeSetData(adapter.getData().get(0), 2, seNode2); // adapter.nodeReplaceChildData(adapter.getData().get(0), nodes); Toast.makeText(BashRecyActivity.this,"新插入了两个node",Toast.LENGTH_LONG).show(); } }, 2000); } private List<BaseNode> getEntity() { List<BaseNode> list = new ArrayList<>(); for (int i = 0; i < 5; i++) { List<BaseNode> secondNodeList = new ArrayList<>(); for (int n = 0; n <= 3; n++) { SecondNode seNode = new SecondNode(secondNodeList, "Second Node " + n); secondNodeList.add(seNode); } FirstNode entity = new FirstNode(secondNodeList, "First Node " + i); // 模拟 默认第0个是展开的 entity.setExpanded(i == 0); list.add(entity); } return list; } }简单记录一下，当然你要有实现点击事件，可以直接看他们官网的，更清楚.
