core/java/android/widget/ThemedSpinnerAdapter.java

/*
 * Copyright (C) 2015 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.content.res.Resources;
import android.content.res.Resources.Theme;
import android.view.View;
import android.view.ViewGroup;

/**
 * An extension of SpinnerAdapter that is capable of inflating drop-down views
 * against a different theme than normal views.
 * <p>
 * Classes that implement this interface should use the theme provided to
 * {@link #setDropDownViewTheme(Theme)} when creating views in
 * {@link SpinnerAdapter#getDropDownView(int, View, ViewGroup)}.
 */
public interface ThemedSpinnerAdapter extends SpinnerAdapter {
    /**
     * Sets the {@link Resources.Theme} against which drop-down views are
     * inflated.
     *
     * @param theme the context against which to inflate drop-down views, or
     *              {@code null} to use the default theme
     * @see SpinnerAdapter#getDropDownView(int, View, ViewGroup)
     */
    void setDropDownViewTheme(@Nullable Resources.Theme theme);

    /**
     * Returns the value previously set by a call to
     * {@link #setDropDownViewTheme(Theme)}.
     *
     * @return the {@link Resources.Theme} against which drop-down views are
     *         inflated, or {@code null} if one has not been explicitly set
     */
    @Nullable
    Resources.Theme getDropDownViewTheme();
}