Android内存和SD卡工具类

    import java.io.File;    import android.os.Environment;    import android.os.StatFs;        public class StorageUtil {        private static final int ERROR = -1;        public static int save_dir = 1;            // 判断是否已经安装SD卡        public static boolean isSDCardExist() {            return android.os.Environment.getExternalStorageState().equals(                    android.os.Environment.MEDIA_MOUNTED);        }            // 内存剩余空间        public static long getAvailableInternalMemorySize() {            File path = Environment.getDataDirectory();            StatFs stat = new StatFs(path.getPath());            long blockSize = stat.getBlockSize();            long availableBlocks = stat.getAvailableBlocks();            return availableBlocks * blockSize;        }            // 内存总空间        public static long getTotalInternalMemorySize() {            File path = Environment.getDataDirectory();            StatFs stat = new StatFs(path.getPath());            long blockSize = stat.getBlockSize();            long totalBlocks = stat.getBlockCount();            return totalBlocks * blockSize;        }            // SD卡剩余空间        public static long getAvailableExternalMemorySize() {            if (isSDCardExist()) {                File path = Environment.getExternalStorageDirectory();                StatFs stat = new StatFs(path.getPath());                long blockSize = stat.getBlockSize();                long availableBlocks = stat.getAvailableBlocks();                return availableBlocks * blockSize;            } else {                return ERROR;            }        }            // SD卡总空间        public static long getTotalExternalMemorySize() {            if (isSDCardExist()) {                File path = Environment.getExternalStorageDirectory();                StatFs stat = new StatFs(path.getPath());                long blockSize = stat.getBlockSize();                long totalBlocks = stat.getBlockCount();                return totalBlocks * blockSize;            } else {                return ERROR;            }        }            // 判断SD卡下external_sd文件夹的总大小        public static long getTotalExternal_SDMemorySize() {            if (isSDCardExist()) {                File path = Environment.getExternalStorageDirectory();                File externalSD = new File(path.getPath() + "/external_sd");                if (externalSD.exists() && externalSD.isDirectory()) {                    StatFs stat = new StatFs(path.getPath() + "/external_sd");                    long blockSize = stat.getBlockSize();                    long totalBlocks = stat.getBlockCount();                    if (getTotalExternalMemorySize() != -1                        && getTotalExternalMemorySize() != totalBlocks* blockSize) {                        return totalBlocks * blockSize;                    } else {                        return ERROR;                    }                } else {                    return ERROR;                }                } else {                return ERROR;            }        }            // 判断SD卡下external_sd文件夹的可用大小        public static long getAvailableExternal_SDMemorySize() {            if (isSDCardExist()) {                File path = Environment.getExternalStorageDirectory();                File externalSD = new File(path.getPath() + "/external_sd");                if (externalSD.exists() && externalSD.isDirectory()) {                    StatFs stat = new StatFs(path.getPath() + "/external_sd");                    long blockSize = stat.getBlockSize();                    long availableBlocks = stat.getAvailableBlocks();                    if (getAvailableExternalMemorySize() != -1                        && getAvailableExternalMemorySize() != availableBlocks* blockSize) {                        return availableBlocks * blockSize;                    } else {                        return ERROR;                    }                    } else {                    return ERROR;                }                } else {                return ERROR;            }        }    }