android开发SD卡工具类
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SD卡工具类整理:
1 package com.gzcivil.utils; 2 3 import java.io.File; 4 import java.io.FileInputStream; 5 import java.io.FileNotFoundException; 6 import java.io.FileOutputStream; 7 import java.io.IOException; 8 import java.io.InputStream; 9 import java.io.OutputStream; 10 import java.math.BigDecimal; 11 12 import android.os.Environment; 13 14 /** 15 * SD卡工具类 16 */ 17 public class SDTool { 18 // 字节参考量(bt/KB/MB/GB/TB) 19 protected final long SIZE_BT = 1024L; 20 protected final long SIZE_KB = SIZE_BT * 1024L; 21 protected final long SIZE_MB = SIZE_KB * 1024L; 22 protected final long SIZE_GB = SIZE_MB * 1024L; 23 protected final long SIZE_TB = SIZE_GB * 1024L; 24 protected final int SACLE = 2; 25 26 private static SDTool mSDTool; 27 private final String mModuleName = this.getClass().getSimpleName(); 28 private static boolean SDCardAvailable = false; // SDCard有效状态 29 private static String SDCardRootDir = ""; // SDCard路径 30 31 private SDTool() { 32 super(); 33 LogUtils.i(SysUtils.LOG_TAG, "创建文件夹"); 34 this.initSDTool(); 35 } 36 37 public static synchronized SDTool getInstance() { 38 if (mSDTool == null) 39 mSDTool = new SDTool(); 40 return mSDTool; 41 } 42 43 // --------------------------get some dir path.... 44 public String getBaseDir() { 45 return SDCardAvailable ? SDCardRootDir + SysConstants.PATH_ROOT : null; 46 } 47 48 /** 获取图片sdcard保存路径 */ 49 public String getImgDir(String urlFileName) { 50 if (SDCardAvailable) 51 return SDCardRootDir + SysConstants.PATH_IMAGE + urlFileName; 52 return null; 53 } 54 55 /** 获取上传图片sdcard保存路径 */ 56 public String getUpImgDir(String urlFileName) { 57 if (SDCardAvailable) 58 return SDCardRootDir + SysConstants.PATH_UPIMAGE + urlFileName; 59 return null; 60 } 61 62 /** 获取sdcard临时目录的路径 */ 63 public String getTempBase() { 64 if (SDCardAvailable) 65 return SDCardRootDir + SysConstants.PATH_TEMP; 66 return null; 67 } 68 69 /** 获取sdcard下载目录的路径 */ 70 public String getDownloadBase() { 71 if (SDCardAvailable) 72 return SDCardRootDir + SysConstants.PATH_DOWNLOAD; 73 return null; 74 } 75 76 /** 获取sdcard数据库目录的路径 */ 77 public String getDataBase() { 78 if (SDCardAvailable) 79 return SDCardRootDir + SysConstants.PATH_DATABASE; 80 return null; 81 } 82 83 /** 获取文件在sdcard临时目录的保存路径 */ 84 public String getTempDir(String urlFileName) { 85 if (SDCardAvailable) 86 return SDCardRootDir + SysConstants.PATH_TEMP + urlFileName; 87 return null; 88 } 89 90 /** 获取文件在sdcard临时目录的保存路径 */ 91 public String getTempDirUpImage(String urlFileName) { 92 if (SDCardAvailable) 93 return SDCardRootDir + SysConstants.PATH_UPIMAGE; 94 return null; 95 } 96 97 /** 98 * 根据SD卡相对路径返回绝对路径 99 * 100 * @param filePath 101 * @return 102 */ 103 public String getSdFullPath(String filePath) { 104 return SDCardRootDir + filePath; 105 } 106 107 // --------------------------public function.... 108 /** 109 * SD卡可用状态检测 110 */ 111 public static boolean isAvailable() { 112 return SDCardAvailable; 113 } 114 115 /** 116 * 检测文件是否存在 117 */ 118 public boolean exists(String filePath) { 119 return SDCardAvailable ? new File(filePath).exists() : false; 120 } 121 122 /** 123 * 检测是否为零字节文件 124 */ 125 public boolean emptyFile(String filePath) { 126 return (!SDCardAvailable || new File(filePath).length() < 1) ? true : false; 127 } 128 129 /** 130 * 根据文件名删除文件 131 * 132 * @param filePath 133 * SDCard卡上完整路径 134 * @return void 135 */ 136 public void deleteFile(String filePath) { 137 if (!SDCardAvailable || StringUtils.isEmpty(filePath)) 138 return; 139 File file = new File(filePath); 140 if (file.exists()) 141 file.delete(); 142 } 143 144 /** 145 * 删除指定目录下所有文件及子目录(不包含自身) 146 * 147 * @param dirPath 148 * @return 149 * @return void 150 */ 151 public synchronized boolean deleteDir(String dirPath) { 152 boolean clearFlag = false; 153 if (!SDCardAvailable) { 154 return false; 155 } 156 157 File file = new File(dirPath); 158 if (file.exists() && file.isDirectory()) { 159 File[] files = file.listFiles(); 160 for (File fileItem : files) { 161 if (fileItem.isFile()) { 162 fileItem.delete(); 163 } 164 } 165 clearFlag = true; 166 } 167 return clearFlag; 168 } 169 170 /** 171 * 获取指定目录大小 172 * 173 * @param dirPath 174 * @return 175 */ 176 public long getPathSize(String dirPath) { 177 long size = 0; 178 if (!SDCardAvailable) 179 return size; 180 181 File file = new File(dirPath); 182 if (file.exists() && file.isDirectory()) { 183 File[] files = file.listFiles(); 184 for (File fileItem : files) { 185 if (fileItem.isFile()) { 186 size += fileItem.length(); 187 } 188 } 189 } 190 return size; 191 } 192 193 /** 194 * 读取SD卡中文本文件 195 * 196 * @param fileName 197 * @return 198 */ 199 200 public String readSDFile(String fileName) { 201 StringBuffer sb = new StringBuffer(); 202 try { 203 File file = new File(fileName); 204 FileInputStream fis = new FileInputStream(file); 205 int c; 206 while ((c = fis.read()) != -1) { 207 sb.append((char) c); 208 } 209 fis.close(); 210 } catch (FileNotFoundException e) { 211 e.printStackTrace(); 212 } catch (IOException e) { 213 e.printStackTrace(); 214 } catch (Exception e) { 215 e.printStackTrace(); 216 } 217 return sb.toString(); 218 } 219 220 /** 221 * 获取指定目录大小-格式化好字串 222 * 223 * @param dirPath 224 * @return 225 */ 226 public String sizeFormatString(long size) { 227 String sizeFormat = ""; 228 if (size >= 0 && size < SIZE_BT) { 229 sizeFormat = size + " Byte"; 230 } else if (size >= SIZE_BT && size < SIZE_KB) { 231 sizeFormat = size / SIZE_BT + " KB"; 232 } else if (size >= SIZE_KB && size < SIZE_MB) { 233 sizeFormat = size / SIZE_KB + " MB"; 234 } else if (size >= SIZE_MB && size < SIZE_GB) { 235 BigDecimal longs = new BigDecimal(Double.valueOf(size + "").toString()); 236 BigDecimal sizeMB = new BigDecimal(Double.valueOf(SIZE_MB + "").toString()); 237 String result = longs.divide(sizeMB, SACLE, BigDecimal.ROUND_HALF_UP).toString(); 238 // double result=size/(double)SIZE_MB; 239 sizeFormat = result + " GB"; 240 } else { 241 BigDecimal longs = new BigDecimal(Double.valueOf(size + "").toString()); 242 BigDecimal sizeMB = new BigDecimal(Double.valueOf(SIZE_GB + "").toString()); 243 String result = longs.divide(sizeMB, SACLE, BigDecimal.ROUND_HALF_UP).toString(); 244 sizeFormat = result + " TB"; 245 } 246 return sizeFormat; 247 } 248 249 /** 250 * 文件拷贝 251 * 252 * @param fromFile 253 * @param toFile 254 * @return 255 */ 256 public boolean CopySdcardFile(String fromFile, String toFile) { 257 boolean copyState = false; 258 try { 259 InputStream fosfrom = new FileInputStream(fromFile); 260 OutputStream fosto = new FileOutputStream(toFile); 261 byte bt[] = new byte[1024]; 262 int c; 263 while ((c = fosfrom.read(bt)) > 0) { 264 fosto.write(bt, 0, c); 265 } 266 fosfrom.close(); 267 fosto.close(); 268 copyState = true; 269 } catch (Exception ex) { 270 LogUtils.e(SysUtils.LOG_TAG, "CopySdcardFile Exception: fromFile=" + fromFile + " toFile=" + toFile + " 复制失败.", this.mModuleName); 271 } 272 return copyState; 273 } 274 275 // ============================================== 276 protected String getMd5(String urlName) { 277 return StringUtils.md5(urlName.getBytes()); 278 } 279 280 @SuppressWarnings("static-access") 281 private void initSDTool() { 282 if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { 283 return; 284 } 285 SDCardAvailable = true; 286 SDCardRootDir = Environment.getExternalStorageDirectory().getPath(); 287 288 this.initSDDir(SDCardRootDir + SysConstants.PATH_ROOT); 289 this.initSDDir(SDCardRootDir + SysConstants.PATH_IMAGE); 290 this.initSDDir(SDCardRootDir + SysConstants.PATH_DATABASE); 291 this.initSDDir(SDCardRootDir + SysConstants.PATH_DOWNLOAD); 292 this.initSDDir(SDCardRootDir + SysConstants.PATH_TEMP); 293 this.initSDDir(SDCardRootDir + SysConstants.PATH_UPIMAGE); 294 } 295 296 /** 297 * 获取SDCard根路径 298 */ 299 public static String getSDCardRootDir() { 300 return SDCardRootDir; 301 } 302 303 public static boolean initSDDir(String dirPath) { 304 boolean flag = false; 305 if (SDCardAvailable) { 306 File tempFile = new File(dirPath); 307 if (!tempFile.exists()) { 308 if (tempFile.mkdirs()) { 309 flag = true; 310 LogUtils.v(SysUtils.LOG_TAG, "tempFile=" + dirPath + " mkdir success!"); 311 } 312 } else { 313 flag = true; 314 LogUtils.v(SysUtils.LOG_TAG, "tempFile=" + dirPath + " is exist!"); 315 } 316 } 317 return flag; 318 } 319 320 }
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