Android开发中的文件操作工具类FileUtil完整实例

package com.ymerp.android.tools;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.LineNumberReader;
import java.io.OutputStream;
import java.io.Reader;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.os.Environment;
import android.util.Log;
import android.widget.Toast;
/**
 * 文件操作工具
 *
 * @author chen.lin
 *
 */
public class FileUtil {
  private static final String TAG = "FileUtil";
  /**
   * 从sd卡取文件
   *
   * @param filename
   * @return
   */
  public String getFileFromSdcard(String filename) {
    ByteArrayOutputStream outputStream = null;
    FileInputStream fis = null;
    try {
      outputStream = new ByteArrayOutputStream();
      File file = new File(Environment.getExternalStorageDirectory(), filename);
      if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
        fis = new FileInputStream(file);
        int len = 0;
        byte[] data = new byte[1024];
        while ((len = fis.read(data)) != -1) {
          outputStream.write(data, 0, len);
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
        outputStream.close();
        fis.close();
      } catch (IOException e) {
      }
    }
    return new String(outputStream.toByteArray());
  }
  /**
   * 保存文件到sd
   *
   * @param filename
   * @param content
   * @return
   */
  public static boolean saveContentToSdcard(String filename, String content) {
    boolean flag = false;
    FileOutputStream fos = null;
    try {
      File file = new File(Environment.getExternalStorageDirectory(), filename);
      if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
        fos = new FileOutputStream(file);
        fos.write(content.getBytes());
        flag = true;
      }
    } catch (Exception e) {
      e.printStackTrace();
      flag = false;
    } finally {
      try {
        fos.close();
      } catch (IOException e) {
      }
    }
    return flag;
  }
  /**
   * 取得文件大小
   *
   * @param f
   * @return
   * @throws Exception
   */
  @SuppressWarnings("resource")
  public static long getFileSizes(File f) throws Exception {
    long size = 0;
    if (f.exists()) {
      FileInputStream fis = null;
      fis = new FileInputStream(f);
      size = fis.available();
    } else {
      f.createNewFile();
    }
    return size;
  }
  /**
   * 递归取得文件夹大小
   *
   * @param dir
   * @return
   * @throws Exception
   */
  public static long getFileSize(File dir) throws Exception {
    long size = 0;
    File flist[] = dir.listFiles();
    for (int i = 0; i = 0) {
        result += file.getPath() + "\n";
      }
    }
    if (result.equals("")) {
      result = "找不到文件!!";
    }
    return result;
  }
  /**
   * @detail 搜索sdcard文件
   * @param 需要进行文件搜索的目录
   * @param 过滤搜索文件类型
   * */
  public static List search(File file, String[] ext) {
    List list = new ArrayList();
    if (file != null) {
      if (file.isDirectory()) {
        File[] listFile = file.listFiles();
        if (listFile != null) {
          for (int i = 0; i  FindFile(File file, String keyword) {
    List list = new ArrayList();
    if (file.isDirectory()) {
      File[] files = file.listFiles();
      if (files != null) {
        for (File tempf : files) {
          if (tempf.isDirectory()) {
            if (tempf.getName().toLowerCase().lastIndexOf(keyword) > -1) {
              list.add(tempf);
            }
            list.addAll(FindFile(tempf, keyword));
          } else {
            if (tempf.getName().toLowerCase().lastIndexOf(keyword) > -1) {
              list.add(tempf);
            }
          }
        }
      }
    }
    return list;
  }
  /**
   * searchFile 查找文件并加入到ArrayList 当中去
   *
   * @param context
   * @param keyword
   * @param filepath
   * @return
   */
  public static List