package cc.duduhuo.simpler.util;

import android.content.Context;
import android.content.Intent;
import android.content.res.AssetManager;
import android.database.Cursor;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.text.TextUtils;
import android.webkit.MimeTypeMap;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;


/**
 * =======================================================
 * 作者:liying - [email protected]
 * 日期:2017/3/6 12:42
 * 版本:1.0
 * 描述:文件工具类
 * 备注:
 * =======================================================
 */
public class FileUtils {
    public final String TAG = "FileUtils";
    public final static String FILE_EXTENSION_SEPARATOR = ".";
    /**
     * URI类型:file
     */
    public static final String URI_TYPE_FILE = "file";


    private FileUtils() {
        throw new AssertionError();
    }

    /**
     * 是否有(外置)存储器
     *
     * @return
     */
    public static boolean hasStorage() {
        boolean hasStorage = false;
        String str = Environment.getExternalStorageState();

        if (str.equalsIgnoreCase(Environment.MEDIA_MOUNTED)) {
            hasStorage = true;
        }
        return hasStorage;
    }

    /**
     * 创建文件
     *
     * @param file
     * @return 创建失败返回""
     */
    public static String createFile(File file) {
        try {
            if (file.getParentFile().exists()) {
                file.createNewFile();
                return file.getAbsolutePath();
            } else {
                file.getParentFile().mkdirs();
                file.createNewFile();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }

    /**
     * read file
     *
     * @param filePath    路径
     * @param charsetName The name of a supported {@link
     *                    java.nio.charset.Charset </code>charset<code>}
     * @return if file not exist, return null, else return content of file
     * @throws RuntimeException if an error occurs while operator
     *                          BufferedReader
     */
    public static StringBuilder readFile(String filePath, String charsetName) {

        File file = new File(filePath);
        StringBuilder fileContent = new StringBuilder("");
        if (file == null || !file.isFile()) {
            return null;
        }

        BufferedReader reader = null;
        try {
            InputStreamReader is = new InputStreamReader(
                    new FileInputStream(file), charsetName);
            reader = new BufferedReader(is);
            String line = null;
            while ((line = reader.readLine()) != null) {
                if (!fileContent.toString().equals("")) {
                    fileContent.append("\r\n");
                }
                fileContent.append(line);
            }
            return fileContent;
        } catch (IOException e) {
            throw new RuntimeException("IOException occurred. ", e);
        } finally {
            IOUtils.close(reader);
        }
    }


    /**
     * write file
     *
     * @param filePath 路径
     * @param content  上下文
     * @param append   is append, if true, write to the end of file, else clear
     *                 content of file and write into it
     * @return return false if content is empty, true otherwise
     * @throws RuntimeException if an error occurs while operator FileWriter
     */
    public static boolean writeFile(String filePath, String content, boolean append) {

        if (TextUtils.isEmpty(content)) {
            return false;
        }

        FileWriter fileWriter = null;
        try {
            makeDirs(filePath);
            fileWriter = new FileWriter(filePath, append);
            fileWriter.write(content);
            return true;
        } catch (IOException e) {
            throw new RuntimeException("IOException occurred. ", e);
        } finally {
            IOUtils.close(fileWriter);
        }
    }


    /**
     * write file
     *
     * @param filePath    路径
     * @param contentList 集合
     * @param append      is append, if true, write to the end of file, else clear
     *                    content of file and write into it
     * @return return false if contentList is empty, true otherwise
     * @throws RuntimeException if an error occurs while operator FileWriter
     */
    public static boolean writeFile(String filePath, List<String> contentList, boolean append) {

        if (contentList.size() == 0 || null == contentList) {
            return false;
        }

        FileWriter fileWriter = null;
        try {
            makeDirs(filePath);
            fileWriter = new FileWriter(filePath, append);
            int i = 0;
            for (String line : contentList) {
                if (i++ > 0) {
                    fileWriter.write("\r\n");
                }
                fileWriter.write(line);
            }
            return true;
        } catch (IOException e) {
            throw new RuntimeException("IOException occurred. ", e);
        } finally {
            IOUtils.close(fileWriter);
        }
    }


    /**
     * write file, the string will be written to the begin of the file
     *
     * @param filePath 地址
     * @param content  上下文
     * @return 是否写入成功
     */
    public static boolean writeFile(String filePath, String content) {

        return writeFile(filePath, content, false);
    }


    /**
     * write file, the string list will be written to the begin of the file
     *
     * @param filePath    地址
     * @param contentList 集合
     * @return 是否写入成功
     */
    public static boolean writeFile(String filePath, List<String> contentList) {
        return writeFile(filePath, contentList, false);

    }


    /**
     * write file, the bytes will be written to the begin of the file
     *
     * @param filePath 路径
     * @param stream   输入流
     * @return 返回是否写入成功
     */
    public static boolean writeFile(String filePath, InputStream stream) {
        return writeFile(filePath, stream, false);

    }


    /**
     * write file
     *
     * @param filePath 路径
     * @param stream   the input stream
     * @param append   if <code>true</code>, then bytes will be written to the
     *                 end
     *                 of the file rather than the beginning
     * @return return true
     * FileOutputStream
     */
    public static boolean writeFile(String filePath, InputStream stream, boolean append) {

        return writeFile(filePath != null ? new File(filePath) : null, stream,
                append);
    }


    /**
     * write file, the bytes will be written to the begin of the file
     *
     * @param file   文件对象
     * @param stream 输入流
     * @return 返回是否写入成功
     */
    public static boolean writeFile(File file, InputStream stream) {
        return writeFile(file, stream, false);

    }


    /**
     * write file
     *
     * @param file   the file to be opened for writing.
     * @param stream the input stream
     * @param append if <code>true</code>, then bytes will be written to the
     *               end
     *               of the file rather than the beginning
     * @return return true
     * @throws RuntimeException if an error occurs while operator
     *                          FileOutputStream
     */
    public static boolean writeFile(File file, InputStream stream, boolean append) {
        OutputStream o = null;
        try {
            makeDirs(file.getAbsolutePath());
            o = new FileOutputStream(file, append);
            byte data[] = new byte[1024];
            int length = -1;
            while ((length = stream.read(data)) != -1) {
                o.write(data, 0, length);
            }
            o.flush();
            return true;
        } catch (FileNotFoundException e) {
            throw new RuntimeException("FileNotFoundException occurred. ", e);
        } catch (IOException e) {
            throw new RuntimeException("IOException occurred. ", e);
        } finally {
            IOUtils.close(o);
            IOUtils.close(stream);
        }
    }


    /**
     * move file
     *
     * @param sourceFilePath 资源路径
     * @param destFilePath   删除的路径
     */
    public static void moveFile(String sourceFilePath, String destFilePath) {

        if (TextUtils.isEmpty(sourceFilePath) ||
                TextUtils.isEmpty(destFilePath)) {
            throw new RuntimeException(
                    "Both sourceFilePath and destFilePath cannot be null.");
        }
        moveFile(new File(sourceFilePath), new File(destFilePath));
    }


    /**
     * move file
     *
     * @param srcFile  文件对象
     * @param destFile 对象
     */
    public static void moveFile(File srcFile, File destFile) {

        boolean rename = srcFile.renameTo(destFile);
        if (!rename) {
            copyFile(srcFile.getAbsolutePath(), destFile.getAbsolutePath());
            deleteFile(srcFile.getAbsolutePath());
        }
    }


    /**
     * copy file
     *
     * @param sourceFilePath 源文件路径
     * @param destFilePath   目标文件路径
     * @return 返回是否成功
     * @throws RuntimeException if an error occurs while operator
     *                          FileOutputStream
     */
    public static boolean copyFile(String sourceFilePath, String destFilePath) {

        InputStream inputStream = null;
        try {
            inputStream = new FileInputStream(sourceFilePath);
        } catch (FileNotFoundException e) {
            throw new RuntimeException("FileNotFoundException occurred. ", e);
        }
        return writeFile(destFilePath, inputStream);
    }


    /**
     * read file to string list, a element of list is a line
     *
     * @param filePath    路径
     * @param charsetName The name of a supported {@link
     *                    java.nio.charset.Charset </code>charset<code>}
     * @return if file not exist, return null, else return content of file
     * @throws RuntimeException if an error occurs while operator
     *                          BufferedReader
     */
    public static List<String> readFileToList(String filePath, String charsetName) {

        File file = new File(filePath);
        List<String> fileContent = new ArrayList<String>();
        if (file == null || !file.isFile()) {
            return null;
        }

        BufferedReader reader = null;
        try {
            InputStreamReader is = new InputStreamReader(
                    new FileInputStream(file), charsetName);
            reader = new BufferedReader(is);
            String line = null;
            while ((line = reader.readLine()) != null) {
                fileContent.add(line);
            }
            return fileContent;
        } catch (IOException e) {
            throw new RuntimeException("IOException occurred. ", e);
        } finally {
            IOUtils.close(reader);
        }
    }


    /**
     * @param filePath 文件的路径
     * @return 返回文件的信息
     */
    public static String getFileNameWithoutExtension(String filePath) {


        if (TextUtils.isEmpty(filePath)) {
            return filePath;
        }

        int extenPosi = filePath.lastIndexOf(FILE_EXTENSION_SEPARATOR);
        int filePosi = filePath.lastIndexOf(File.separator);
        if (filePosi == -1) {
            return (extenPosi == -1
                    ? filePath
                    : filePath.substring(0, extenPosi));
        }
        if (extenPosi == -1) {
            return filePath.substring(filePosi + 1);
        }
        return (filePosi < extenPosi ? filePath.substring(filePosi + 1,
                extenPosi) : filePath.substring(filePosi + 1));
    }


    /**
     * get file name from path, include suffix
     * <p>
     * <pre>
     *      getFileName(null)               =   null
     *      getFileName("")                 =   ""
     *      getFileName("   ")              =   "   "
     *      getFileName("a.mp3")            =   "a.mp3"
     *      getFileName("a.b.rmvb")         =   "a.b.rmvb"
     *      getFileName("abc")              =   "abc"
     *      getFileName("c:\\")              =   ""
     *      getFileName("c:\\a")             =   "a"
     *      getFileName("c:\\a.b")           =   "a.b"
     *      getFileName("c:a.txt\\a")        =   "a"
     *      getFileName("/home/admin")      =   "admin"
     *      getFileName("/home/admin/a.txt/b.mp3")  =   "b.mp3"
     * </pre>
     *
     * @param filePath 路径
     * @return file name from path, include suffix
     */
    public static String getFileName(String filePath) {

        if (TextUtils.isEmpty(filePath)) {
            return filePath;
        }

        int filePosi = filePath.lastIndexOf(File.separator);
        return (filePosi == -1) ? filePath : filePath.substring(filePosi + 1);
    }


    /**
     * get folder name from path
     * <p>
     * <pre>
     *      getFolderName(null)               =   null
     *      getFolderName("")                 =   ""
     *      getFolderName("   ")              =   ""
     *      getFolderName("a.mp3")            =   ""
     *      getFolderName("a.b.rmvb")         =   ""
     *      getFolderName("abc")              =   ""
     *      getFolderName("c:\\")              =   "c:"
     *      getFolderName("c:\\a")             =   "c:"
     *      getFolderName("c:\\a.b")           =   "c:"
     *      getFolderName("c:a.txt\\a")        =   "c:a.txt"
     *      getFolderName("c:a\\b\\c\\d.txt")    =   "c:a\\b\\c"
     *      getFolderName("/home/admin")      =   "/home"
     *      getFolderName("/home/admin/a.txt/b.mp3")  =   "/home/admin/a.txt"
     * </pre>
     *
     * @param filePath 路径
     * @return file name from path, include suffix
     */
    public static String getFolderName(String filePath) {


        if (TextUtils.isEmpty(filePath)) {
            return filePath;
        }

        int filePosi = filePath.lastIndexOf(File.separator);
        return (filePosi == -1) ? "" : filePath.substring(0, filePosi);
    }


    /**
     * get suffix of file from path
     * <p>
     * <pre>
     *      getFileExtension(null)               =   ""
     *      getFileExtension("")                 =   ""
     *      getFileExtension("   ")              =   "   "
     *      getFileExtension("a.mp3")            =   "mp3"
     *      getFileExtension("a.b.rmvb")         =   "rmvb"
     *      getFileExtension("abc")              =   ""
     *      getFileExtension("c:\\")              =   ""
     *      getFileExtension("c:\\a")             =   ""
     *      getFileExtension("c:\\a.b")           =   "b"
     *      getFileExtension("c:a.txt\\a")        =   ""
     *      getFileExtension("/home/admin")      =   ""
     *      getFileExtension("/home/admin/a.txt/b")  =   ""
     *      getFileExtension("/home/admin/a.txt/b.mp3")  =   "mp3"
     * </pre>
     *
     * @param filePath 路径
     * @return 信息
     */
    public static String getFileExtension(String filePath) {

        if (TextUtils.isEmpty(filePath)) {
            return filePath;
        }

        int extenPosi = filePath.lastIndexOf(FILE_EXTENSION_SEPARATOR);
        int filePosi = filePath.lastIndexOf(File.separator);
        if (extenPosi == -1) {
            return "";
        }
        return (filePosi >= extenPosi) ? "" : filePath.substring(extenPosi + 1);
    }


    /**
     * @param filePath 路径
     * @return 是否创建成功
     */
    public static boolean makeDirs(String filePath) {

        String folderName = getFolderName(filePath);
        if (TextUtils.isEmpty(folderName)) {
            return false;
        }

        File folder = new File(folderName);
        return (folder.exists() && folder.isDirectory()) || folder.mkdirs();
    }


    /**
     * @param filePath 路径
     * @return 是否创建成功
     */
    public static boolean makeFolders(String filePath) {
        return makeDirs(filePath);

    }


    /**
     * @param filePath 路径
     * @return 是否存在这个文件
     */
    public static boolean isFileExist(String filePath) {
        if (TextUtils.isEmpty(filePath)) {
            return false;
        }

        File file = new File(filePath);
        return (file.exists() && file.isFile());

    }


    /**
     * @param directoryPath 路径
     * @return 是否有文件夹
     */
    public static boolean isFolderExist(String directoryPath) {

        if (TextUtils.isEmpty(directoryPath)) {
            return false;
        }

        File dire = new File(directoryPath);
        return (dire.exists() && dire.isDirectory());
    }


    /**
     * @param path 路径
     * @return 是否删除成功
     */
    public static boolean deleteFile(String path) {

        if (TextUtils.isEmpty(path)) {
            return true;
        }

        File file = new File(path);
        if (!file.exists()) {
            return true;
        }
        if (file.isFile()) {
            return file.delete();
        }
        if (!file.isDirectory()) {
            return false;
        }
        for (File f : file.listFiles()) {
            if (f.isFile()) {
                f.delete();
            } else if (f.isDirectory()) {
                deleteFile(f.getAbsolutePath());
            }
        }
        return file.delete();
    }


    /**
     * @param path 路径
     * @return 返回文件大小
     */
    public static long getFileSize(String path) {

        if (TextUtils.isEmpty(path)) {
            return -1;
        }

        File file = new File(path);
        return (file.exists() && file.isFile() ? file.length() : -1);
    }


    /**
     * 保存多媒体数据为文件.
     *
     * @param data     多媒体数据
     * @param fileName 保存文件名
     * @return 保存成功或失败
     */
    public static boolean save2File(InputStream data, String fileName) {
        File file = new File(fileName);
        FileOutputStream fos = null;
        try {
            // 文件或目录不存在时,创建目录和文件.
            if (!file.exists()) {
                file.getParentFile().mkdirs();
                file.createNewFile();
            }

            // 写入数据
            fos = new FileOutputStream(file);
            byte[] b = new byte[1024];
            int len;
            while ((len = data.read(b)) > -1) {
                fos.write(b, 0, len);
            }
            fos.close();

            return true;
        } catch (IOException ex) {

            return false;
        }
    }


    /**
     * 读取文件的字节数组.
     *
     * @param file 文件
     * @return 字节数组
     */
    public static byte[] readFile4Bytes(File file) {

        // 如果文件不存在,返回空
        if (!file.exists()) {
            return null;
        }
        FileInputStream fis = null;
        try {
            // 读取文件内容.
            fis = new FileInputStream(file);
            byte[] arrData = new byte[(int) file.length()];
            fis.read(arrData);
            // 返回
            return arrData;
        } catch (IOException e) {
            return null;
        } finally {
            if (fis != null) {
                try {
                    fis.close();
                } catch (IOException e) {

                }
            }
        }
    }


    /**
     * 读取文本文件内容,以行的形式读取
     *
     * @param filePathAndName 带有完整绝对路径的文件名
     * @return String 返回文本文件的内容
     */
    public static String readFileContent(String filePathAndName) {
        try {
            return readFileContent(filePathAndName, null, null, 1024);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }


    /**
     * 读取文本文件内容,以行的形式读取
     *
     * @param filePathAndName 带有完整绝对路径的文件名
     * @param encoding        文本文件打开的编码方式 例如 GBK,UTF-8
     * @param sep             分隔符 例如:#,默认为\n;
     * @param bufLen          设置缓冲区大小
     * @return String 返回文本文件的内容
     */
    public static String readFileContent(String filePathAndName, String encoding, String sep, int bufLen) {
        if (filePathAndName == null || filePathAndName.equals("")) {
            return "";
        }
        if (sep == null || sep.equals("")) {
            sep = "\n";
        }
        if (!new File(filePathAndName).exists()) {
            return "";
        }
        StringBuffer str = new StringBuffer("");
        FileInputStream fs = null;
        InputStreamReader isr = null;
        BufferedReader br = null;
        try {
            fs = new FileInputStream(filePathAndName);
            if (encoding == null || encoding.trim().equals("")) {
                isr = new InputStreamReader(fs);
            } else {
                isr = new InputStreamReader(fs, encoding.trim());
            }
            br = new BufferedReader(isr, bufLen);

            String data = "";
            while ((data = br.readLine()) != null) {
                str.append(data).append(sep);
            }
        } catch (IOException e) {
        } finally {
            try {
                if (br != null) br.close();
                if (isr != null) isr.close();
                if (fs != null) fs.close();
            } catch (IOException e) {
            }
        }
        return str.toString();
    }


    /**
     * 把Assets里的文件拷贝到sd卡上
     *
     * @param assetManager    AssetManager
     * @param fileName        Asset文件名
     * @param destinationPath 完整目标路径
     * @return 拷贝成功
     */
    public static boolean copyAssetToSDCard(AssetManager assetManager, String fileName, String destinationPath) {

        try {
            InputStream is = assetManager.open(fileName);
            FileOutputStream os = new FileOutputStream(destinationPath);

            if (is != null && os != null) {
                byte[] data = new byte[1024];
                int len;
                while ((len = is.read(data)) > 0) {
                    os.write(data, 0, len);
                }

                os.close();
                is.close();
            }
        } catch (IOException e) {
            return false;
        }
        return true;
    }


    /**
     * 调用系统方式打开文件.
     *
     * @param context 上下文
     * @param file    文件
     */
    public static void openFile(Context context, File file) {

        try {
            // 调用系统程序打开文件.
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.setDataAndType(Uri.fromFile(file), MimeTypeMap.getSingleton()
                    .getMimeTypeFromExtension(
                            MimeTypeMap
                                    .getFileExtensionFromUrl(
                                            file.getPath())));
            context.startActivity(intent);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }


    /**
     * 根据文件路径,检查文件是否不大于指定大小
     *
     * @param filepath 文件路径
     * @param maxSize  最大
     * @return 是否
     */
    public static boolean checkFileSize(String filepath, int maxSize) {

        File file = new File(filepath);
        if (!file.exists() || file.isDirectory()) {
            return false;
        }
        if (file.length() <= maxSize * 1024) {
            return true;
        } else {
            return false;
        }
    }


    /**
     * @param context 上下文
     * @param file    文件对象
     */
    public static void openMedia(Context context, File file) {

        if (file.getName().endsWith(".png") ||
                file.getName().endsWith(".jpg") ||
                file.getName().endsWith(".jpeg")) {
            viewPhoto(context, file);
        } else {
            openFile(context, file);
        }
    }


    /**
     * 打开多媒体文件.
     *
     * @param context 上下文
     * @param file    多媒体文件
     */
    public static void viewPhoto(Context context, String file) {

        viewPhoto(context, new File(file));
    }


    /**
     * 打开照片
     *
     * @param context 上下文
     * @param file    文件对象
     */
    public static void viewPhoto(Context context, File file) {

        try {
            // 调用系统程序打开文件.
            Intent intent = new Intent(Intent.ACTION_VIEW);
            //			intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.setDataAndType(Uri.fromFile(file), "image/*");
            context.startActivity(intent);
        } catch (Exception ex) {
            Toast.makeText(context, "打开失败.", Toast.LENGTH_SHORT).show();
        }
    }


    /**
     * 将字符串以UTF-8编码保存到文件中
     *
     * @param str      保存的字符串
     * @param fileName 文件的名字
     * @return 是否保存成功
     */
    public static boolean saveStrToFile(String str, String fileName) {

        return saveStrToFile(str, fileName, "UTF-8");
    }


    /**
     * 将字符串以charsetName编码保存到文件中
     *
     * @param str         保存的字符串
     * @param fileName    文件的名字
     * @param charsetName 字符串编码
     * @return 是否保存成功
     */
    public static boolean saveStrToFile(String str, String fileName, String charsetName) {

        if (str == null || "".equals(str)) {
            return false;
        }

        FileOutputStream stream = null;
        try {
            File file = new File(fileName);
            if (!file.getParentFile().exists()) {
                file.getParentFile().mkdirs();
            }

            byte[] b = null;
            if (charsetName != null && !"".equals(charsetName)) {
                b = str.getBytes(charsetName);
            } else {
                b = str.getBytes();
            }

            stream = new FileOutputStream(file);
            stream.write(b, 0, b.length);
            stream.flush();
            return true;
        } catch (Exception e) {
            return false;
        } finally {
            if (stream != null) {
                try {
                    stream.close();
                    stream = null;
                } catch (Exception e) {
                }
            }
        }
    }


    /**
     * 将content://形式的uri转为实际文件路径
     *
     * @param context 上下文
     * @param uri     地址
     * @return uri转为实际文件路径
     */
    public static String uriToPath(Context context, Uri uri) {

        Cursor cursor = null;
        try {
            if (uri.getScheme().equalsIgnoreCase(URI_TYPE_FILE)) {
                return uri.getPath();
            }
            cursor = context.getContentResolver()
                    .query(uri, null, null, null, null);
            if (cursor.moveToFirst()) {
                return cursor.getString(cursor.getColumnIndex(
                        MediaStore.Images.Media.DATA)); //图片文件路径
            }
        } catch (Exception e) {
            if (null != cursor) {
                cursor.close();
                cursor = null;
            }
            return null;
        }
        return null;
    }


    /**
     * 打开多媒体文件.
     *
     * @param context 上下文
     * @param file    多媒体文件
     */
    public static void playSound(Context context, String file) {

        playSound(context, new File(file));
    }


    /**
     * 打开多媒体文件.
     *
     * @param context 上下文
     * @param file    多媒体文件
     */
    public static void playSound(Context context, File file) {

        try {
            // 调用系统程序打开文件.
            Intent intent = new Intent(Intent.ACTION_VIEW);
            //			intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            //			intent.setClassName("com.android.music", "com.android.music.MediaPlaybackActivity");
            intent.setDataAndType(Uri.fromFile(file), "audio/*");
            context.startActivity(intent);
        } catch (Exception ex) {
            Toast.makeText(context, "打开失败.", Toast.LENGTH_SHORT).show();
        }
    }


    /**
     * 打开视频文件.
     *
     * @param context 上下文
     * @param file    视频文件
     */
    public static void playVideo(Context context, String file) {

        playVideo(context, new File(file));
    }


    /**
     * 打开视频文件.
     *
     * @param context 上下文
     * @param file    视频文件
     */
    public static void playVideo(Context context, File file) {
        try {
            // 调用系统程序打开文件.
            Intent intent = new Intent(Intent.ACTION_VIEW);
            //			intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.setDataAndType(Uri.fromFile(file), "video/*");
            context.startActivity(intent);
        } catch (Exception ex) {
            Toast.makeText(context, "打开失败.", Toast.LENGTH_SHORT).show();
        }
    }


    /**
     * 文件重命名
     *
     * @param oldPath 旧的文件名字
     * @param newPath 新的文件名字
     */
    public static void renameFile(String oldPath, String newPath) {

        try {
            if (!TextUtils.isEmpty(oldPath) && !TextUtils.isEmpty(newPath)
                    && !oldPath.equals(newPath)) {
                File fileOld = new File(oldPath);
                File fileNew = new File(newPath);
                fileOld.renameTo(fileNew);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}