FileUtil.java

package com.itbox.fx.util;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Environment;

public class FileUtil {

	/**
	 * SD卡是否可用
	 */
	public static boolean isSDCardAvailable() {
		return Environment.MEDIA_MOUNTED.equals(Environment
				.getExternalStorageState());
	}

	public static void copy(File src, File dist) {
		FileInputStream in = null;
		FileOutputStream out = null;
		try {
			in = new FileInputStream(src);
			out = new FileOutputStream(dist);
			byte[] buf = new byte[1024];
			int len;
			while ((len = in.read(buf)) != -1) {
				out.write(buf, 0, len);
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (in != null) {
				try {
					in.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if (out != null) {
				try {
					out.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}

	/**
	 * 保存图片到指定的目录
	 * 
	 * @param bit
	 * @param fileName
	 *            文件名
	 * @return
	 */
	public static String saveBitToSD(Bitmap bit, String fileName) {
		if (bit == null || bit.isRecycled())
			return "";

		File file = new File(Environment.getExternalStorageDirectory(), "/");
		File dirFile = new File(file.getAbsolutePath());
		if (!dirFile.exists()) {
			dirFile.mkdirs();
		}
		File pathFile = new File(dirFile, fileName);
		if (pathFile.exists()) {
			return pathFile.getAbsolutePath();
		} else {
			ImageUtils.Bitmap2File(bit, pathFile.getAbsolutePath());
			return pathFile.getAbsolutePath();
		}
	}

	/**
	 * Bitmap转换为文件
	 * 
	 * @param bitmap
	 * @param filename
	 */
	public static void Bitmap2File(Bitmap bitmap, String filename) {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
		FileOutputStream fos = null;
		try {
			fos = new FileOutputStream(filename);
			fos.write(baos.toByteArray());
			fos.flush();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if (fos != null)
					fos.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	/**
	 * 从SD卡加载图片
	 * 
	 * @param imagePath
	 * @return
	 */
	public static Bitmap getImageFromLocal(String imagePath) {
		// File file = new File(imagePath);
		// if (file.exists()) {
		// Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
		// // file.setLastModified(System.currentTimeMillis());
		// return bitmap;
		// }
		//
		// return null;
		try {
			FileInputStream fis = new FileInputStream(imagePath);
			return BitmapFactory.decodeStream(fis);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
			return null;
		}
	}
}