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