項目中碰到了計算緩存大小和清空緩存的功能,這個很常見的功能,幾乎每一個APP都有,覺得實現很簡單,網上搜了一大堆,發現都不是符合我須要的,並且常常刪除的沒有效果,因而又另外找了一些資料,折騰了蠻久,終於完成了。如下的這個類的功能很簡單,計算你的緩存總大小,無論內部緩存仍是外部緩存,和清空緩存,包括內部和外部的緩存一塊兒清空:java
public class DataCleanManager { public static String getTotalCacheSize(Context context) throws Exception { long cacheSize = getFolderSize(context.getCacheDir()); if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { cacheSize += getFolderSize(context.getExternalCacheDir()); } return getFormatSize(cacheSize); } public static void clearAllCache(Context context) { deleteDir(context.getCacheDir()); if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { deleteDir(context.getExternalCacheDir()); } } private static boolean deleteDir(File dir) { if (dir != null && dir.isDirectory()) { String[] children = dir.list(); for (int i = 0; i < children.length; i++) { boolean success = deleteDir(new File(dir, children[i])); if (!success) { return false; } } } return dir.delete(); } // 獲取文件 //Context.getExternalFilesDir() --> SDCard/Android/data/你的應用的包名/files/ 目錄,通常放一些長時間保存的數據 //Context.getExternalCacheDir() --> SDCard/Android/data/你的應用包名/cache/目錄,通常存放臨時緩存數據 public static long getFolderSize(File file) throws Exception { long size = 0; try { File[] fileList = file.listFiles(); for (int i = 0; i < fileList.length; i++) { // 若是下面還有文件 if (fileList[i].isDirectory()) { size = size + getFolderSize(fileList[i]); } else { size = size + fileList[i].length(); } } } catch (Exception e) { e.printStackTrace(); } return size; } /** * 格式化單位 * @param size */ public static String getFormatSize(double size) { double kiloByte = size / 1024; if (kiloByte < 1) { return size + "Byte"; } double megaByte = kiloByte / 1024; if (megaByte < 1) { BigDecimal result1 = new BigDecimal(Double.toString(kiloByte)); return result1.setScale(2, BigDecimal.ROUND_HALF_UP) .toPlainString() + "KB"; } double gigaByte = megaByte / 1024; if (gigaByte < 1) { BigDecimal result2 = new BigDecimal(Double.toString(megaByte)); return result2.setScale(2, BigDecimal.ROUND_HALF_UP) .toPlainString() + "MB"; } double teraBytes = gigaByte / 1024; if (teraBytes < 1) { BigDecimal result3 = new BigDecimal(Double.toString(gigaByte)); return result3.setScale(2, BigDecimal.ROUND_HALF_UP) .toPlainString() + "GB"; } BigDecimal result4 = new BigDecimal(teraBytes); return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB"; } }
當你在項目中須要查下緩存大小,就使用getTotalCacheSize(Context)方法,清空緩存,就使用clearAllCache(Context)方法。固然,開發完APP也是須要進行全方位的檢測:www.ineice.com。緩存