Android 文件工具類

package com.yiban.caesar.Utils;

import android.annotation.TargetApi;
import android.content.ContentUris;
import android.content.Context;
import android.content.res.Resources;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.media.ExifInterface;
import android.net.Uri;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.text.TextUtils;
import android.util.Log;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.DecimalFormat;
import java.util.regex.Pattern;

public class FileSizeUtil {
    public static final int SIZETYPE_B = 1;// 獲取文件大小單位爲B的double值
    public static final int SIZETYPE_KB = 2;// 獲取文件大小單位爲KB的double值
    public static final int SIZETYPE_MB = 3;// 獲取文件大小單位爲MB的double值
    public static final int SIZETYPE_GB = 4;// 獲取文件大小單位爲GB的double值

    /**
     * 獲取文件指定文件的指定單位的大小
     *
     * @param filePath 文件路徑
     * @param sizeType 獲取大小的類型1爲B、2爲KB、3爲MB、4爲GB
     * @return double值的大小
     */
    public static double getFileOrFilesSize(String filePath, int sizeType) {
        File file = new File(filePath);
        long blockSize = 0;
        try {
            if (file.isDirectory()) {
                blockSize = getFileSizes(file);
            } else {
                blockSize = getFileSize(file);
            }
        } catch (Exception e) {
            e.printStackTrace();
            Log.e("獲取文件大小", "獲取失敗!" + e.getMessage());
        }
        return FormetFileSize(blockSize, sizeType);
    }

    /**
     * 調用此方法自動計算指定文件或指定文件夾的大小
     *
     * @param filePath 文件路徑
     * @return 計算好的帶B、KB、MB、GB的字符串
     */
    public static String getAutoFileOrFilesSize(String filePath) {
        File file = new File(filePath);
        long blockSize = 0;
        try {
            if (file.isDirectory()) {
                blockSize = getFileSizes(file);
            } else {
                blockSize = getFileSize(file);
            }
        } catch (Exception e) {
            e.printStackTrace();
            Log.e("獲取文件大小", "獲取失敗!");
        }
        return FormetFileSize(blockSize);
    }

    /**
     * 獲取指定文件大小
     *
     * @return
     * @throws Exception
     */
    private static long getFileSize(File file) throws Exception {
        long size = 0;
        if (file.exists()) {
            FileInputStream fis = null;
            fis = new FileInputStream(file);
            size = fis.available();
        } else {
            file.createNewFile();
            Log.e("獲取文件大小", "文件不存在!");
        }
        return size;
    }

    /**
     * 獲取指定文件夾
     *
     * @param f
     * @return
     * @throws Exception
     */
    private static long getFileSizes(File f) throws Exception {
        long size = 0;
        File flist[] = f.listFiles();
        for (int i = 0; i < flist.length; i++) {
            if (flist[i].isDirectory()) {
                size = size + getFileSizes(flist[i]);
            } else {
                size = size + getFileSize(flist[i]);
            }
        }
        return size;
    }

    /**
     * 轉換文件大小
     *
     * @param fileS
     * @return
     */
    private static String FormetFileSize(long fileS) {
        DecimalFormat df = new DecimalFormat("#.00");
        String fileSizeString = "";
        String wrongSize = "0B";
        if (fileS == 0) {
            return wrongSize;
        }
        if (fileS < 1024) {
            fileSizeString = df.format((double) fileS) + "B";
        } else if (fileS < 1048576) {
            fileSizeString = df.format((double) fileS / 1024) + "KB";
        } else if (fileS < 1073741824) {
            fileSizeString = df.format((double) fileS / 1048576) + "MB";
        } else {
            fileSizeString = df.format((double) fileS / 1073741824) + "GB";
        }
        return fileSizeString;
    }

    /**
     * 轉換文件大小,指定轉換的類型
     *
     * @param fileS
     * @param sizeType
     * @return
     */
    private static double FormetFileSize(long fileS, int sizeType) {
        DecimalFormat df = new DecimalFormat("#.00");
        double fileSizeLong = 0;
        switch (sizeType) {
            case SIZETYPE_B:
                fileSizeLong = Double.valueOf(df.format((double) fileS));
                break;
            case SIZETYPE_KB:
                fileSizeLong = Double.valueOf(df.format((double) fileS / 1024));
                break;
            case SIZETYPE_MB:
                fileSizeLong = Double.valueOf(df.format((double) fileS / 1048576));
                break;
            case SIZETYPE_GB:
                fileSizeLong = Double.valueOf(df
                        .format((double) fileS / 1073741824));
                break;
            default:
                break;
        }
        return fileSizeLong;
    }

    /**
     * 獲取本應用的緩存數據
     *
     * @return
     */
    public static String getTheAppCacheSize(Context context) {
        double filesSize = 0.00;

        if (context.getFilesDir().exists()) {
            filesSize = getFileOrFilesSize(context.getFilesDir()
                    .getAbsolutePath(), 3);
        }

        // if (context.getCacheDir().exists()) {
        // filesSize += getFileOrFilesSize(context.getCacheDir()
        // .getAbsolutePath(), 3);
        // }
        //
        // if (new File("/data/data/" + context.getPackageName() + "/databases")
        // .exists()) {
        // filesSize += getFileOrFilesSize(
        // new File("/data/data/" + context.getPackageName()
        // + "/databases").getAbsolutePath(), 3);
        // }
        //
        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED)) {
            filesSize += getFileOrFilesSize(
                    new File("/data/data/" + context.getPackageName()
                            + "/databases").getAbsolutePath(), 3);
        }

        String filesSizeStr = filesSize + "";
        if (filesSizeStr.length() >= 4) {
            filesSizeStr = filesSizeStr.substring(0, 4);
        }

        return filesSizeStr + "MB";
    }

    @TargetApi(19)
    public static String getImageAbsolutePath(Context context, Uri imageUri) {
        if (context == null || imageUri == null)
            return null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT
                && DocumentsContract.isDocumentUri(context, imageUri)) {
            if (isExternalStorageDocument(imageUri)) {
                String docId = DocumentsContract.getDocumentId(imageUri);
                String[] split = docId.split(":");
                String type = split[0];
                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/"
                            + split[1];
                }
            } else if (isDownloadsDocument(imageUri)) {
                String id = DocumentsContract.getDocumentId(imageUri);
                Uri contentUri = ContentUris.withAppendedId(
                        Uri.parse("content://downloads/public_downloads"),
                        Long.valueOf(id));
                return getDataColumn(context, contentUri, null, null);
            } else if (isMediaDocument(imageUri)) {
                String docId = DocumentsContract.getDocumentId(imageUri);
                String[] split = docId.split(":");
                String type = split[0];
                Uri contentUri = null;
                if ("image".equals(type)) {
                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                } else if ("video".equals(type)) {
                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                } else if ("audio".equals(type)) {
                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                }
                String selection = MediaStore.Images.Media._ID + "=?";
                String[] selectionArgs = new String[]{split[1]};
                return getDataColumn(context, contentUri, selection,
                        selectionArgs);
            }
        } // MediaStore (and general)
        else if ("content".equalsIgnoreCase(imageUri.getScheme())) {
            // Return the remote address
            if (isGooglePhotosUri(imageUri))
                return imageUri.getLastPathSegment();
            return getDataColumn(context, imageUri, null, null);
        }
        // File
        else if ("file".equalsIgnoreCase(imageUri.getScheme())) {
            return imageUri.getPath();
        }
        return null;
    }

    public static String getDataColumn(Context context, Uri uri,
                                       String selection, String[] selectionArgs) {
        Cursor cursor = null;
        String column = MediaStore.Images.Media.DATA;
        String[] projection = {column};
        try {
            cursor = context.getContentResolver().query(uri, projection,
                    selection, selectionArgs, null);
            if (cursor != null && cursor.moveToFirst()) {
                int index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is ExternalStorageProvider.
     */
    public static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri
                .getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is DownloadsProvider.
     */
    public static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri
                .getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is MediaProvider.
     */
    public static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri
                .getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is Google Photos.
     */
    public static boolean isGooglePhotosUri(Uri uri) {
        return "com.google.android.apps.photos.content".equals(uri
                .getAuthority());
    }

    public static String substring(String str, int start) {
        if (str == null) {
            return null;
        } else {
            if (start < 0) {
                start += str.length();
            }

            if (start < 0) {
                start = 0;
            }

            return start > str.length() ? "" : str.substring(start);
        }
    }

    public static boolean isNumeric(String str) {
        Pattern pattern = Pattern.compile("[0-9]*");
        return pattern.matcher(str).matches();
    }

    public static byte[] toPrimitive(Byte[] array) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return new byte[0];
        } else {
            byte[] result = new byte[array.length];

            for (int i = 0; i < array.length; ++i) {
                result[i] = array[i].byteValue();
            }

            return result;
        }
    }

    public static boolean containsWhitespace(CharSequence seq) {
        if (TextUtils.isEmpty(seq)) {
            return false;
        } else {
            int strLen = seq.length();

            for (int i = 0; i < strLen; ++i) {
                if (Character.isWhitespace(seq.charAt(i))) {
                    return true;
                }
            }

            return false;
        }
    }

    private static DecimalFormat df = new DecimalFormat("0.00");

    public static String getNumberFormat(Number f) {
        if (f == null) {
            return null;
        }
        return df.format(f);
    }

    /**
     * 得到指定路徑圖片的options，不加載內存
     * @param srcPath 源圖片路徑
     * @return Options {@link BitmapFactory.Options}
     */
    public static BitmapFactory.Options getBitmapOptions(String srcPath) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(srcPath, options);
        return options;
    }

    /**
     * 壓縮指定路徑圖片，並將其保存在緩存目錄中;<br>
     *      通過isDelSrc判定是否刪除源文件，並獲取到緩存後的圖片路徑;<br>
     *      圖片過大可能OOM
     * @param context
     * @param srcPath
     * @param rqsW
     * @param rqsH
     * @param isDelSrc
     * @return
     */
    public static String compressBitmap(Context context, String srcPath,
                                        Bitmap.CompressFormat format,
                                        int rqsW, int rqsH, boolean isDelSrc) {
        Bitmap bitmap = compressBitmap(srcPath, rqsW, rqsH);
        File srcFile = new File(srcPath);
        String desPath = getImageCacheDir(context) + srcFile.getName();
        clearCropFile(desPath);
        int degree = getDegrees(srcPath);
        try {
            if (degree != 0) bitmap = rotateBitmap(bitmap, degree);
            File file = new File(desPath);
            FileOutputStream fos = new FileOutputStream(file);
            bitmap.compress(format, 70, fos);
            fos.close();
            if (isDelSrc) srcFile.deleteOnExit();
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        return desPath;
    }

    /**
     * 壓縮指定路徑的圖片，並得到圖片對象
     * @param path bitmap source path
     * @return Bitmap {@link Bitmap}
     */
    public static Bitmap compressBitmap(String path, int rqsW, int rqsH) {
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path, options);
        options.inSampleSize = calculateInSampleSize(options, rqsW, rqsH);
        options.inPreferredConfig = Bitmap.Config.RGB_565;
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeFile(path, options);
    }


    /**
     * 壓縮資源圖片，並返回圖片對象
     * @param res {@link Resources}
     * @param resID
     * @param reqsW
     * @param reqsH
     * @return
     */
    public static Bitmap compressBitmap(Resources res, int resID, int reqsW, int reqsH) {
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeResource(res, resID, options);
        options.inSampleSize = calculateInSampleSize(options, reqsW, reqsH);
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeResource(res, resID, options);
    }

    /**
     * 基於質量的壓縮算法， 此方法未 解決壓縮後圖像失真問題
     * <br> 可先調用比例壓縮適當壓縮圖片後，再調用此方法可解決上述問題
     * <br> 壓縮格式爲JPEG
     * @param bitmap
     * @param maxBytes 壓縮後的圖像最大大小 單位爲byte
     * @return
     */
    public static Bitmap compressBitmap(Bitmap bitmap, long maxBytes) {
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
            int options = 90;
            while (baos.toByteArray().length > maxBytes) {
                baos.reset();
                bitmap.compress(Bitmap.CompressFormat.JPEG, options, baos);
                options -= 10;
            }
            byte[] bts = baos.toByteArray();
            Bitmap bmp = BitmapFactory.decodeByteArray(bts, 0, bts.length);
            baos.close();
            return bmp;
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return null;
        }
    }
    /**
     * calculate the bitmap sampleSize
     * @param options
     * @return
     */
    public static int calculateInSampleSize(BitmapFactory.Options options, int rqsW, int rqsH) {
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;
        if (rqsW == 0 || rqsH == 0) return 1;
        if (height > rqsH || width > rqsW) {
            final int heightRatio = Math.round((float) height/ (float) rqsH);
            final int widthRatio = Math.round((float) width / (float) rqsW);
            inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
        }
        return inSampleSize;
    }
    /**
     * 獲取圖片緩存路徑
     * @param context
     * @return
     */
    private static String getImageCacheDir(Context context) {
        String dir = context.getCacheDir() + "Image" + File.separator;
        File file = new File(dir);
        if (!file.exists()) file.mkdirs();
        return dir;
    }

    /**
     * get the orientation of the bitmap {@link ExifInterface}
     * @param path 圖片路徑
     * @return
     */
    public static int getDegrees(String path) {
        int degree = 0;
        try {
            ExifInterface exifInterface = new ExifInterface(path);
            int orientation = exifInterface.getAttributeInt(
                    ExifInterface.TAG_ORIENTATION,
                    ExifInterface.ORIENTATION_NORMAL);
            switch (orientation) {
                case ExifInterface.ORIENTATION_ROTATE_90:
                    degree = 90;
                    break;
                case ExifInterface.ORIENTATION_ROTATE_180:
                    degree = 180;
                    break;
                case ExifInterface.ORIENTATION_ROTATE_270:
                    degree = 270;
                    break;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return degree;
    }

    /**
     * rotate the bitmap
     * @param bitmap
     * @param degrees
     * @return
     */
    public static Bitmap rotateBitmap(Bitmap bitmap, int degrees) {
        if (bitmap != null) {
            Matrix m = new Matrix();
            m.postRotate(degrees);
            bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), m, true);
            return bitmap;
        }
        return null;
    }

    public static boolean saveBitmap(Bitmap bitmap, String path,
                                     Bitmap.CompressFormat format, int quality) {
        try {
            File file = new File(path);
            Log.i("tag", "壓縮後:" + file.length());
            File parent = file.getParentFile();
            if (!parent.exists()) {
                parent.mkdirs();
            }
            FileOutputStream fos = new FileOutputStream(file);
            boolean b = bitmap.compress(format, quality, fos);
            fos.flush();
            fos.close();
            return b;

        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }

    /**
     * 刪除文件
     *
     * @param uri 文件Uri
     * @return 成功與否
     */
    public static boolean clearCropFile(Uri uri) {
        if (uri == null) {
            return false;
        }
        return clearCropFile(uri.getPath());
    }

    /**
     * 刪除文件
     *
     * @param path 文件路徑
     * @return 成功與否
     */
    public static boolean clearCropFile(String path) {
        if (TextUtils.isEmpty(path)) {
            return false;
        }
        //有時文件明明存在  但 file.exists爲false

        File file = new File(path);

        //System.out.println("工具判斷:"+FileUtils.exists(file)+" 原始判斷:"+file.exists()+" \npath:"+file.getPath());

        if (file.exists()) {
            boolean result = file.delete();
            if (result) {
                System.out.println("Cached crop file cleared.");
            } else {
                System.out.println("Failed to clear cached crop file.");
            }
            return result;
        } else {
            System.out.println("Trying to clear cached crop file but it does not exist.");
        }

        return false;
    }
}