public class FileSizeUtil {
	public static final int SIZETYPE_B = 1;// 獲取檔案大小單位為B的double值
	public static final int SIZETYPE_KB = 2;// 獲取檔案大小單位為KB的double值
	public static final int SIZETYPE_MB = 3;// 獲取檔案大小單位為MB的double值
	public static final int SIZETYPE_GB = 4;// 獲取檔案大小單位為GB的double值

	/**
	 * 獲取檔案指定檔案的指定單位的大小
	 * @param filePath 檔案路徑
	 * @param sizeType 獲取大小的型別1為B、2為KB、3為MB、4為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("獲取檔案大小", "獲取失敗!");
		}
		return FormetFileSize(blockSize, sizeType);
	}

	/**
	 * 呼叫此方法自動計算指定檔案或指定資料夾的大小
	 * @param filePath 檔案路徑
	 * @return 計算好的帶B、KB、MB、GB的字串
	 */
	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("獲取檔案大小", "獲取失敗!");
		}
		return FormetFileSize(blockSize);
	}

	/**
	 * 獲取指定檔案大小
	 */
	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("獲取檔案大小", "檔案不存在!");
		}
		return size;
	}

	/**
	 * 獲取指定資料夾
	 */
	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;
	}

	/**
	 * 轉換檔案大小
	 */
	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;
	}

	/**
	 * 轉換檔案大小,指定轉換的型別
	 */
	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;
	}
}
 

2.PictureUtil.java

public class PictureUtil {
	/**
	 * 把bitmap轉換成String
	 */
	public static String bitmapToString(String filePath) {
		Bitmap bm = getSmallBitmap(filePath);
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		bm.compress(Bitmap.CompressFormat.JPEG, 40, baos);
		byte[] b = baos.toByteArray();
		return Base64.encodeToString(b, Base64.DEFAULT);
	}

	/**
	 * 計算圖片的縮放值
	 */
	public static int calculateInSampleSize(BitmapFactory.Options options,
			int reqWidth, int reqHeight) {
		// Raw height and width of image
		final int height = options.outHeight;
		final int width = options.outWidth;
		int inSampleSize = 1;

		if (height > reqHeight || width > reqWidth) {
			// Calculate ratios of height and width to requested height and
			// width
			final int heightRatio = Math.round((float) height / (float) reqHeight);
			final int widthRatio = Math.round((float) width / (float) reqWidth);
			// Choose the smallest ratio as inSampleSize value, this will
			// guarantee
			// a final image with both dimensions larger than or equal to the
			// requested height and width.
			inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
		}
		return inSampleSize;
	}

	/**
	 * 根據路徑獲得突破並壓縮返回bitmap用於顯示
	 */
	public static Bitmap getSmallBitmap(String filePath) {
		final BitmapFactory.Options options = new BitmapFactory.Options();
		options.inJustDecodeBounds = true;
		BitmapFactory.decodeFile(filePath, options);
		// Calculate inSampleSize
		options.inSampleSize = calculateInSampleSize(options, 480, 800);
		// Decode bitmap with inSampleSize set
		options.inJustDecodeBounds = false;
		return BitmapFactory.decodeFile(filePath, options);
	}

	/**
	 * 根據路徑刪除圖片
	 */
	public static void deleteTempFile(String path) {
		File file = new File(path);
		if (file.exists()) {
			file.delete();
		}
	}

	/**
	 * 新增到相簿
	 */
	public static void galleryAddPic(Context context, String path) {
		Intent mediaScanIntent = new Intent(
				Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
		File f = new File(path);
		Uri contentUri = Uri.fromFile(f);
		mediaScanIntent.setData(contentUri);
		context.sendBroadcast(mediaScanIntent);
	}

	/**
	 * 獲取儲存圖片的目錄
	 */
	public static File getAlbumDir() {
		File dir = new File(
				Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
				getAlbumName());
		if (!dir.exists()) {
			dir.mkdirs();
		}
		return dir;
	}

	/**
	 * 獲取儲存 隱患檢查的圖片資料夾名稱
	 */
	public static String getAlbumName() {
		return "sheguantong";
	}
}
 

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>