19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2007 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.widget; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.database.DataSetObservable; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.database.DataSetObserver; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.View; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewGroup; 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Common base class of common implementation for an {@link Adapter} that can be 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * used in both {@link ListView} (by implementing the specialized 27c502744f2ddcc80a34f5197b5d2c0d701c7d6e71Newton Allen * {@link ListAdapter} interface) and {@link Spinner} (by implementing the 28c502744f2ddcc80a34f5197b5d2c0d701c7d6e71Newton Allen * specialized {@link SpinnerAdapter} interface). 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic abstract class BaseAdapter implements ListAdapter, SpinnerAdapter { 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final DataSetObservable mDataSetObservable = new DataSetObservable(); 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean hasStableIds() { 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void registerDataSetObserver(DataSetObserver observer) { 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mDataSetObservable.registerObserver(observer); 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void unregisterDataSetObserver(DataSetObserver observer) { 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mDataSetObservable.unregisterObserver(observer); 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 46f5d412a0c707bfc3a5e27cdaaea8b2a4e8cb5d72Adam Powell * Notifies the attached observers that the underlying data has been changed 47f5d412a0c707bfc3a5e27cdaaea8b2a4e8cb5d72Adam Powell * and any View reflecting the data set should refresh itself. 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void notifyDataSetChanged() { 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mDataSetObservable.notifyChanged(); 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 52f5d412a0c707bfc3a5e27cdaaea8b2a4e8cb5d72Adam Powell 53f5d412a0c707bfc3a5e27cdaaea8b2a4e8cb5d72Adam Powell /** 54f5d412a0c707bfc3a5e27cdaaea8b2a4e8cb5d72Adam Powell * Notifies the attached observers that the underlying data is no longer valid 55f5d412a0c707bfc3a5e27cdaaea8b2a4e8cb5d72Adam Powell * or available. Once invoked this adapter is no longer valid and should 56f5d412a0c707bfc3a5e27cdaaea8b2a4e8cb5d72Adam Powell * not report further data set changes. 57f5d412a0c707bfc3a5e27cdaaea8b2a4e8cb5d72Adam Powell */ 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void notifyDataSetInvalidated() { 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mDataSetObservable.notifyInvalidated(); 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean areAllItemsEnabled() { 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isEnabled(int position) { 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public View getDropDownView(int position, View convertView, ViewGroup parent) { 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getView(position, convertView, parent); 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getItemViewType(int position) { 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getViewTypeCount() { 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1; 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isEmpty() { 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getCount() == 0; 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 86