Android——SD卡工具类——SDCardUtils.java

package com.xdsjs.save.utils;

/**
* SD卡相关的辅助类
* Created by xdsjs on 2015/10/13.
*/

import java.io.File;

import android.os.Environment;
import android.os.StatFs;

public class SDCardUtils {
private SDCardUtils() {
/* cannot be instantiated */
throw new UnsupportedOperationException("cannot be instantiated");
}

/**
* 判断SDCard是否可用
*
* @return
*/
public static boolean isSDCardEnable() {
return Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED);

}

/**
* 获取SD卡路径
*
* @return
*/
public static String getSDCardPath() {
return Environment.getExternalStorageDirectory().getAbsolutePath()
+ File.separator;
}

/**
* 获取SD卡的剩余容量 单位byte
*
* @return
*/
public static long getSDCardAllSize() {
if (isSDCardEnable()) {
StatFs stat = new StatFs(getSDCardPath());
// 获取空闲的数据块的数量
long availableBlocks = stat.getAvailableBlocks();
// 获取单个数据块的大小（byte）
long blockSize = stat.getBlockSize();
return blockSize * availableBlocks;
}
return 0;
}

/**
* 获取指定路径所在空间的剩余可用容量字节数，单位byte
*
* @param filePath
* @return 容量字节 SDCard可用空间，内部存储可用空间
*/
public static long getFreeBytes(String filePath) {
// 如果是sd卡的下的路径，则获取sd卡可用容量
if (filePath.startsWith(getSDCardPath())) {
filePath = getSDCardPath();
} else {// 如果是内部存储的路径，则获取内存存储的可用容量
filePath = Environment.getDataDirectory().getAbsolutePath();
}
StatFs stat = new StatFs(filePath);
long availableBlocks = (long) stat.getAvailableBlocks() - 4;
return stat.getBlockSize() * availableBlocks;
}

/**
* 获取系统存储路径
*
* @return
*/
public static String getRootDirectoryPath() {
return Environment.getRootDirectory().getAbsolutePath();
}

}