Initial Contribution

1 files changed, 76 insertions, 0 deletions

diff --git a/core/java/android/widget/BaseAdapter.java b/core/java/android/widget/BaseAdapter.java
new file mode 100644
index 0000000..1921d73
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+++ b/core/java/android/widget/BaseAdapter.java
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+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.widget;
+
+import android.database.DataSetObservable;
+import android.database.DataSetObserver;
+import android.view.View;
+import android.view.ViewGroup;
+
+/**
+ * Common base class of common implementation for an {@link Adapter} that can be
+ * used in both {@link ListView} (by implementing the specialized
+ * {@link ListAdapter} interface} and {@link Spinner} (by implementing the
+ * specialized {@link SpinnerAdapter} interface.
+ */
+public abstract class BaseAdapter implements ListAdapter, SpinnerAdapter {
+    private final DataSetObservable mDataSetObservable = new DataSetObservable();
+
+    public boolean hasStableIds() {
+        return false;
+    }
+    
+    public void registerDataSetObserver(DataSetObserver observer) {
+        mDataSetObservable.registerObserver(observer);
+    }
+
+    public void unregisterDataSetObserver(DataSetObserver observer) {
+        mDataSetObservable.unregisterObserver(observer);
+    }
+    
+    public void notifyDataSetChanged() {
+        mDataSetObservable.notifyChanged();
+    }
+    
+    public void notifyDataSetInvalidated() {
+        mDataSetObservable.notifyInvalidated();
+    }
+
+    public boolean areAllItemsEnabled() {
+        return true;
+    }
+
+    public boolean isEnabled(int position) {
+        return true;
+    }
+
+    public View getDropDownView(int position, View convertView, ViewGroup parent) {
+        return getView(position, convertView, parent);
+    }
+
+    public int getItemViewType(int position) {
+        return 0;
+    }
+
+    public int getViewTypeCount() {
+        return 1;
+    }
+    
+    public boolean isEmpty() {
+        return getCount() == 0;
+    }
+}