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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.annotation.Nullable;
import android.annotation.UnsupportedAppUsage;
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 {
@UnsupportedAppUsage
private final DataSetObservable mDataSetObservable = new DataSetObservable();
private CharSequence[] mAutofillOptions;
public boolean hasStableIds() {
return false;
}
public void registerDataSetObserver(DataSetObserver observer) {
mDataSetObservable.registerObserver(observer);
}
public void unregisterDataSetObserver(DataSetObserver observer) {
mDataSetObservable.unregisterObserver(observer);
}
/**
* Notifies the attached observers that the underlying data has been changed
* and any View reflecting the data set should refresh itself.
*/
public void notifyDataSetChanged() {
mDataSetObservable.notifyChanged();
}
/**
* Notifies the attached observers that the underlying data is no longer valid
* or available. Once invoked this adapter is no longer valid and should
* not report further data set changes.
*/
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;
}
@Override
public CharSequence[] getAutofillOptions() {
return mAutofillOptions;
}
/**
* Sets the value returned by {@link #getAutofillOptions()}
*/
public void setAutofillOptions(@Nullable CharSequence... options) {
mAutofillOptions = options;
}
}
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