packages/SettingsLib/SettingsSpinner/src/com/android/settingslib/widget/SettingsSpinnerAdapter.java

/*
 * Copyright (C) 2022 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 com.android.settingslib.widget;

import android.content.Context;
import android.os.Build;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;

/**
 * An ArrayAdapter which was used by Spinner with settings style.
 * @param <T> the data type to be loaded.
 */
public class SettingsSpinnerAdapter<T> extends ArrayAdapter<T> {

    private static final int DEFAULT_RESOURCE = R.layout.settings_spinner_view;
    private static final int DFAULT_DROPDOWN_RESOURCE = R.layout.settings_spinner_dropdown_view;
    private final LayoutInflater mDefaultInflater;

    /**
     * Constructs a new SettingsSpinnerAdapter with the given context.
     * And it customizes title bar with a settings style.
     *
     * @param context The Context the view is running in, through which it can
     *                access the current theme, resources, etc.
     */
    public SettingsSpinnerAdapter(Context context) {
        super(context, getDefaultResource());

        setDropDownViewResource(getDropdownResource());
        mDefaultInflater = LayoutInflater.from(context);
    }

    /**
     * In overridded {@link #getView(int, View, ViewGroup)}, use this method to get default view.
     */
    public View getDefaultView(int position, View convertView, ViewGroup parent) {
        return mDefaultInflater.inflate(getDefaultResource(), parent, false /* attachToRoot */);
    }

    /**
     * In overridded {@link #getDropDownView(int, View, ViewGroup)}, use this method to get default
     * drop down view.
     */
    public View getDefaultDropDownView(int position, View convertView, ViewGroup parent) {
        return mDefaultInflater.inflate(getDropdownResource(), parent, false /* attachToRoot */);
    }

    private static int getDefaultResource() {
        return (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU)
                ? DEFAULT_RESOURCE : android.R.layout.simple_spinner_dropdown_item;
    }
    private static int getDropdownResource() {
        return (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU)
                ? DFAULT_DROPDOWN_RESOURCE : android.R.layout.simple_spinner_dropdown_item;
    }
}