xUtils之FileUtil

来源：互联网发布：安防网络工程公司编辑：程序博客网时间：2024/06/14 21:32
功能强大的FileUtil
public class FileUtil {    private FileUtil() {    }    public static File getCacheDir(String dirName) {        File result;        if (existsSdcard()) {            File cacheDir = x.app().getExternalCacheDir();            if (cacheDir == null) {                result = new File(Environment.getExternalStorageDirectory(),                        "Android/data/" + x.app().getPackageName() + "/cache/" + dirName);            } else {                result = new File(cacheDir, dirName);            }        } else {            result = new File(x.app().getCacheDir(), dirName);        }        if (result.exists() || result.mkdirs()) {            return result;        } else {            return null;        }    }    /**     * 检查磁盘空间是否大于10mb     *     * @return true 大于     */    public static boolean isDiskAvailable() {        long size = getDiskAvailableSize();        return size > 10 * 1024 * 1024; // > 10bm    }    /**     * 获取磁盘可用空间     *     * @return byte 单位 kb     */    public static long getDiskAvailableSize() {        if (!existsSdcard()) return 0;        File path = Environment.getExternalStorageDirectory(); // 取得sdcard文件路径        StatFs stat = new StatFs(path.getAbsolutePath());        long blockSize = stat.getBlockSize();        long availableBlocks = stat.getAvailableBlocks();        return availableBlocks * blockSize;        // (availableBlocks * blockSize)/1024 KIB 单位        // (availableBlocks * blockSize)/1024 /1024 MIB单位    }    public static Boolean existsSdcard() {        return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);    }    public static long getFileOrDirSize(File file) {        if (!file.exists()) return 0;        if (!file.isDirectory()) return file.length();        long length = 0;        File[] list = file.listFiles();        if (list != null) { // 文件夹被删除时, 子文件正在被写入, 文件属性异常返回null.            for (File item : list) {                length += getFileOrDirSize(item);            }        }        return length;    }    /**     * 复制文件到指定文件     *     * @param fromPath 源文件     * @param toPath   复制到的文件     * @return true 成功，false 失败     */    public static boolean copy(String fromPath, String toPath) {        boolean result = false;        File from = new File(fromPath);        if (!from.exists()) {            return result;        }        File toFile = new File(toPath);        IOUtil.deleteFileOrDir(toFile);        File toDir = toFile.getParentFile();        if (toDir.exists() || toDir.mkdirs()) {            FileInputStream in = null;            FileOutputStream out = null;            try {                in = new FileInputStream(from);                out = new FileOutputStream(toFile);                IOUtil.copy(in, out);                result = true;            } catch (Throwable ex) {                LogUtil.d(ex.getMessage(), ex);                result = false;            } finally {                IOUtil.closeQuietly(in);                IOUtil.closeQuietly(out);            }        }        return result;    }}
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