BaseListAdapter 也不需要在构造时传入typecount, 可以通过注册的type,来计算出typeCount

Author: kmfish

app/src/main/java/net/kmfish/sample/ListViewActivity.java

@@ -25,14 +25,15 @@ protected void onCreate(Bundle savedInstanceState) {
         setContentView(R.layout.activity_list);
 
         listView = (ListView) findViewById(R.id.listview);
-        adapter = new BaseListAdapter(2);
+        adapter = new BaseListAdapter();
+        adapter.registerDataAndItem(TextModel.class, LineListItem1.class);
+        adapter.registerDataAndItem(ImageModel.class, LineListItem2.class);
+
         listView.setAdapter(adapter);
         setupAdapter(adapter);
     }
 
     private void setupAdapter(BaseListAdapter adapter) {
-        adapter.registerDataAndItem(TextModel.class, LineListItem1.class);
-        adapter.registerDataAndItem(ImageModel.class, LineListItem2.class);
 
         adapter.setNotifyOnChange(false);
         for (int i = 0, len = 30; i < len; i++) {

multitypelistviewadapter/src/main/java/net/kmfish/multitypelistviewadapter/BaseListAdapter.java

@@ -16,23 +16,21 @@ public class BaseListAdapter extends BaseAdapter implements NotifyDataSetChanged
 
     private BaseArrayAdapter arrayAdapter;
 
-    private int typeCount;
-
     private LayoutInflater mInflater;
 
     private ListItemFactory itemFactory = new ClassListItemFactory();
 
-    public BaseListAdapter(int typeCount) {
-        init(typeCount);
+    public BaseListAdapter() {
+        init();
     }
 
-    private void init(int typeCount) {
+    private void init() {
         arrayAdapter = new BaseArrayAdapter(this);
-        this.typeCount = typeCount;
     }
 
     /**
      * 初始化Adapter时调用此方法注册数据类型和Item类型的映射关系
+     * 注意: 需要在setAdapter之前调用!!
      * @param dataClz
      * @param itemClz
      */
@@ -89,7 +87,13 @@ public boolean isEnabled(int position) {
 
     @Override
     public int getViewTypeCount() {
-        return typeCount;
+        int count = itemFactory.getTypeCount();
+        if (0 == count) {
+            throw new RuntimeException(
+                    "registerDataAndItem() should be called before ListView.setAdapter(adapter)!");
+        }
+
+        return itemFactory.getTypeCount();
     }
 
     @Override

multitypelistviewadapter/src/main/java/net/kmfish/multitypelistviewadapter/ClassListItemFactory.java

@@ -32,4 +32,9 @@ public final ListItem create(Class dataType) {
     public final void registerDataType(Class dataType, Class<? extends ListItem> itemClz) {
         dataItemMap.put(dataType, itemClz);
     }
+
+    @Override
+    public int getTypeCount() {
+        return dataItemMap.size();
+    }
 }

multitypelistviewadapter/src/main/java/net/kmfish/multitypelistviewadapter/ListItemFactory.java

@@ -10,4 +10,6 @@ public interface ListItemFactory<T> {
 
     void registerDataType(T dataType, Class<? extends ListItem> itemClz);
 
+    int getTypeCount();
+
 }