/*
 * Copyright (C) 2013 Peng fei Pan <sky@xiaopan.me>
 * 
 * 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.github.lazylibrary.util;

import android.os.Environment;
import java.io.File;

/**
 * SD卡工具箱
 */
public class SDCardUtils {
    /**
     * 获取SD卡的状态
     */
    public static String getState() {
        return Environment.getExternalStorageState();
    }


    /**
     * SD卡是否可用
     *
     * @return 只有当SD卡已经安装并且准备好了才返回true
     */
    public static boolean isAvailable() {
        return getState().equals(Environment.MEDIA_MOUNTED);
    }


    /**
     * 获取SD卡的根目录
     *
     * @return null：不存在SD卡
     */
    public static File getRootDirectory() {
        return isAvailable() ? Environment.getExternalStorageDirectory() : null;
    }


    /**
     * 获取SD卡的根路径
     *
     * @return null：不存在SD卡
     */
    public static String getRootPath() {
        File rootDirectory = getRootDirectory();
        return rootDirectory != null ? rootDirectory.getPath() : null;
    }
    /**
     *获取sd卡路径
     * @return Stringpath
     */
    public static String getSDPath(){

        File sdDir = null;
        boolean sdCardExist = Environment.getExternalStorageState()
                                         .equals(Environment.MEDIA_MOUNTED);   //判断sd卡是否存在
        if   (sdCardExist)
        {
            sdDir = Environment.getExternalStorageDirectory();//获取跟目录
        }
        return sdDir.toString();

    }
}